Boranes: The collective name for the boron hydrides, which are analogous to the alkanes and silanes. Numerous boranes are known. Some have high calorific values and are used in high-energy fuels. (From Grant & Hackh's Chemical Dictionary, 5th ed)Boron: A trace element with the atomic symbol B, atomic number 5, and atomic weight [10.806; 10.821]. Boron-10, an isotope of boron, is used as a neutron absorber in BORON NEUTRON CAPTURE THERAPY.Boron Compounds: Inorganic or organic compounds that contain boron as an integral part of the molecule.Borates: Inorganic or organic salts and esters of boric acid.Phosphines: Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)Amino Alcohols: Compounds possessing both a hydroxyl (-OH) and an amino group (-NH2).Boron Neutron Capture Therapy: A technique for the treatment of neoplasms, especially gliomas and melanomas in which boron-10, an isotope, is introduced into the target cells followed by irradiation with thermal neutrons.Stereoisomerism: The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)EthersBenzophenonesSuccinimides: A subclass of IMIDES with the general structure of pyrrolidinedione. They are prepared by the distillation of ammonium succinate. They are sweet-tasting compounds that are used as chemical intermediates and plant growth stimulants.Biotin: A water-soluble, enzyme co-factor present in minute amounts in every living cell. It occurs mainly bound to proteins or polypeptides and is abundant in liver, kidney, pancreas, yeast, and milk.Silicon Dioxide: Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.Molecular Structure: The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.Molecular Probes: A group of atoms or molecules attached to other molecules or cellular structures and used in studying the properties of these molecules and structures. Radioactive DNA or RNA sequences are used in MOLECULAR GENETICS to detect the presence of a complementary sequence by NUCLEIC ACID HYBRIDIZATION.Substrate Specificity: A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts.Hydrogenation: Addition of hydrogen to a compound, especially to an unsaturated fat or fatty acid. (From Stedman, 26th ed)Iridium: A metallic element with the atomic symbol Ir, atomic number 77, and atomic weight 192.22.Ruthenium: A hard, brittle, grayish-white rare earth metal with an atomic symbol Ru, atomic number 44, and atomic weight 101.07. It is used as a catalyst and hardener for PLATINUM and PALLADIUM.Alkadienes: Acyclic branched or unbranched hydrocarbons having two carbon-carbon double bonds.Alcohols: Alkyl compounds containing a hydroxyl group. They are classified according to relation of the carbon atom: primary alcohols, R-CH2OH; secondary alcohols, R2-CHOH; tertiary alcohols, R3-COH. (From Grant & Hackh's Chemical Dictionary, 5th ed)Ammonia: A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions. Note that the aqueous form of ammonia is referred to as AMMONIUM HYDROXIDE.Spectrum Analysis: The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Spectrophotometry, Infrared: Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Spectroscopy, Fourier Transform Infrared: A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.Burning Mouth Syndrome: A group of painful oral symptoms associated with a burning or similar sensation. There is usually a significant organic component with a degree of functional overlay; it is not limited to the psychophysiologic group of disorders.Infrared Rays: That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.Neodymium: Neodymium. An element of the rare earth family of metals. It has the atomic symbol Nd, atomic number 60, and atomic weight 144.24, and is used in industrial applications.Nanotechnology: The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.Textbooks as Topic: Books used in the study of a subject that contain a systematic presentation of the principles and vocabulary of a subject.Thioamides: Organic compounds containing the radical -CSNH2.Nanostructures: Materials which have structured components with at least one dimension in the range of 1 to 100 nanometers. These include NANOCOMPOSITES; NANOPARTICLES; NANOTUBES; and NANOWIRES.Physics: The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)BooksPlasma Gases: Ionized gases, consisting of free electrons and ionized atoms or molecules which collectively behave differently than gas, solid, or liquid. Plasma gases are used in biomedical fields in surface modification; biological decontamination; dentistry (e.g., PLASMA ARC DENTAL CURING LIGHTS); and in other treatments (e.g., ARGON PLASMA COAGULATION).Atmospheric Pressure: The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned.Desulfovibrio desulfuricans: The type species of gram-negative, anaerobic bacteria of the genus DESULFOVIBRIO. It is found in FRESHWATER; SOIL, and in marine or brackish water.Computer Security: Protective measures against unauthorized access to or interference with computer operating systems, telecommunications, or data structures, especially the modification, deletion, destruction, or release of data in computers. It includes methods of forestalling interference by computer viruses or so-called computer hackers aiming to compromise stored data.Confidentiality: The privacy of information and its protection against unauthorized disclosure.Hydrogen: The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.Powder Diffraction: Method of using a polycrystalline powder and Rietveld refinement (LEAST SQUARES ANALYSIS) of X-RAY DIFFRACTION or NEUTRON DIFFRACTION. It circumvents the difficulties of producing single large crystals.Privacy: The state of being free from intrusion or disturbance in one's private life or affairs. (Random House Unabridged Dictionary, 2d ed, 1993)Hydrogen Sulfide: A flammable, poisonous gas with a characteristic odor of rotten eggs. It is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent. (From Merck Index, 11th ed)Musculoskeletal Diseases: Diseases of the muscles and their associated ligaments and other connective tissue and of the bones and cartilage viewed collectively.Safety: Freedom from exposure to danger and protection from the occurrence or risk of injury or loss. It suggests optimal precautions in the workplace, on the street, in the home, etc., and includes personal safety as well as the safety of property.Sulfides: Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties.Human Engineering: The science of designing, building or equipping mechanical devices or artificial environments to the anthropometric, physiological, or psychological requirements of the people who will use them.Occupational Diseases: Diseases caused by factors involved in one's employment.Drug Labeling: Use of written, printed, or graphic materials upon or accompanying a drug container or wrapper. It includes contents, indications, effects, dosages, routes, methods, frequency and duration of administration, warnings, hazards, contraindications, side effects, precautions, and other relevant information.Mass Spectrometry: An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.Neutrons: Electrically neutral elementary particles found in all atomic nuclei except light hydrogen; the mass is equal to that of the proton and electron combined and they are unstable when isolated from the nucleus, undergoing beta decay. Slow, thermal, epithermal, and fast neutrons refer to the energy levels with which the neutrons are ejected from heavier nuclei during their decay.Search Engine: Software used to locate data or information stored in machine-readable form locally or at a distance such as an INTERNET site.Protons: Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.Neutron Diffraction: The scattering of NEUTRONS by matter, especially crystals, with accompanying variation in intensity due to interference effects. It is useful in CRYSTALLOGRAPHY and POWDER DIFFRACTION.Fast Neutrons: Neutrons, the energy of which exceeds some arbitrary level, usually around one million electron volts.Information Storage and Retrieval: Organized activities related to the storage, location, search, and retrieval of information.

Mammalian nitric oxide synthases. (1/130)

The nitric oxide (NO) synthase family of enzymes generate NO from L-arginine, which acts as a biologic effector molecule in a broad number of settings. This report summarizes some of the current information regarding NO synthase structure-function, reaction mechanism, control of catalysis, and protein interactions.  (+info)

[3H]diborane reduction of vitamin K-dependent calcium-binding proteins. Identification of a unique amino acid. (2/130)

gamma-Carboxyglutamic acid has recently been identified as a component of the vitamin K-dependent region of bovine prothrombin (Nelsestuen, G. L., Zytkovicz, T. H., and Howard J. B. (1974) J. Biol Chem. 249, 6347-6350). The presence of this amino acid has been substantiated here by the reduction of vitamin K-dependent proteins with [3H]-DIBORANE. The reduction product of gamma-carboxyglutamic acid, 5,5'-[3H]dihydroxyleucine, was shown to be present in hydrolysates of reduced rat prothrombin, bovine prothrombin, and bovine factor X. The results are consistent with a minimum of 10 gamma-carboxyglutamic acid residues in the nonthrombin-generating region of bovine prothrombin but no such residues in the thrombin precursor portion of prothrombin. It is concluded that amino acid analyses of [3H]diborane-reduced proteins provides a sensitive, qualitative method for the identification of proteins which contain gamma-carboxyglutamic acid and are vitamin K-dependent.  (+info)

Alpha-glucosidase inhibitors with a 4,5,6,7-tetrachlorophthalimide skeleton pendanted with a cycloalkyl or dicarba-closo-dodecaborane group. (3/130)

Previous studies of alpha-glucosidase inhibitors derived from thalidomide revealed that 4,5,6,7-tetrachloro-N-alkylphthalimide derivatives are superior lead compounds. Structure-activity relationship studies indicated that a hydrophobic group at the N(2) position is mandatory for potent activity. Accordingly, we have designed and synthesized some 4,5,6,7-tetrachloro-N-cycloalkylphthalimide and 4,5,6,7-tetrachloro-N-dicarba-closo-dodecaborane derivatives. The prepared compounds exhibited potent alpha-glucosidase-inhibitory activity. Among them, 4,5,6,7-tetrachloro-N-cycloheptylphthalimide (9) showed the most potent activity, being approximately 30 times more active than the classical inhibitor, 1-deoxynojirimycin (1).  (+info)

A synthesis of 3-phenyl-1,2,3,4-tetrahydroisoquinoline and 2-phenyl-1,2,4,5-tetrahydro-3H-3-benzazepine via Pummerer-type cyclization: enhancing effect of boron trifluoride diethyl etherate on the cyclization. (4/130)

A synthesis of 6,7-dimethoxy-3-phenyl-1,2,3,4-tetrahydroisoquinoline (14a) and 7,8-dimethoxy-2-phenyl-1,2,4,5-tetrahydro-3H-3-benzazepine (14b) was achieved via the cyclization of N-(3,4-dimethoxyphenyl)methyl-1-phenyl-2-(phenylsulfinyl)ethylformamide (6a) and N-2-(3,4-dimethoxyphenyl)ethyl-1-phenyl-2-(phenylsulfinyl)-ethylformamide (6b) using the Pummerer reaction as a key step, respectively. The Pummerer reaction of 6a,b under usual conditions using trifluoroacetic anhydride yielded the vinyl sulfides (8a, b), non-cyclized products, as a major product. The cyclization proceeded when boron trifluoride diethyl etherate was used as an additive reagent, thus giving rise to the corresponding cyclized products (7a) and (7b) in moderate yields. We propose that the enhancing effect of the Lewis acid on the cyclization may be attributable to the involvement of a dicationic intermediate, sulfonium-carbenium dication (23).  (+info)

In vitro antimycobacterial activities of 2'-monosubstituted isonicotinohydrazides and their cyanoborane adducts. (5/130)

As a result of our search for new isoniazid derivatives with extended spectra of activity, we evaluated the in vitro antimycobacterial activities of isonicotinohydrazides (compounds 2) and their cyanoborane adducts (compounds 3), both obtained by the reaction of isonicotinoylhydrazones (compounds 1) with sodium cyanoborohydride. Most of the tested compounds displayed moderate to high activity against Mycobacterium tuberculosis H37Rv, with MICs ranging from 0.2 to 12.5 microg/ml. In particular, some hydrazides showed activity similar to that of rifampin (MIC = 0.2 microg/ml) and rather low cytotoxicity, so that they were generally shown to possess high safety indices. In contrast, the coordination to a cyanoborane (BH(2)CN) group (compounds 3) in general brought about a decrease in antimycobacterial activity, while cytotoxicity increased. Interestingly, selected compounds 1 to 3, mostly hydrazides (compounds 2), were effective in killing M. tuberculosis growing within macrophages at concentrations in culture medium which were much lower than the corresponding MICs. These compounds also displayed good activity against drug-resistant M. tuberculosis strains.  (+info)

Convection-enhanced delivery of boronated epidermal growth factor for molecular targeting of EGF receptor-positive gliomas. (6/130)

Convection enhanced delivery (CED) is potentially a powerful method to improvethe targeting of macromolecules to the central nervous system by applying a pressure gradient to establish bulk flow through the brain interstitium during infusion. The purpose of the present study was to evaluate CED as a means to improve the intracerebral and intratumoral (i.t.) uptake of a heavily boronated macromolecule (dendrimer; BD) linked to epidermal growth factor (EGF) for neutron capture therapy in rats bearing a syngeneic epidermal growth factor receptor (EGFR) + glioma. Boronated EGF was radiolabeled with 125I and administered by CED at a rate of 0.33 micro l/min for 15, 30, and 60 min [infusion volumes (V(I)) of 5, 10, and 20 micro l, respectively], using a syringe pump connected to an indwelling cannula implanted into the right caudate nucleus of normal rats or i.t. in rats bearing either F98(EGFR) or F98 wild-type (F98(WT)) gliomas. After infusion, rats were euthanized, and their brains were removed and serially sectioned. The uptake and biodistribution of (125)I-boronated EGF in tumor or brain was studied by quantitative autoradiography and gamma-scintillation counting. The volume of distribution (V(d)) in brain was assessed using a computer interfaced image analysis system. After CED, the V(d) increased from 34.4 to 123.5 micro l with corresponding V(i) ranging from 5 to 20 micro l. The V(d) of BD-EGF in the brain was 64.8 +/- 13.4 micro l with CED (V(i) 10 micro ), and the V(d):V(i) ratio was 6.5 compared with a V(d) of 9.4 +/- 1.6 micro l and a V(d):V(i) ratio of 0.9 after direct intracerebral injection. As determined by quantitative autoradiography and gamma-scintillation counting at 24 h after CED, 47.4% of the injected dose per gram tissue (%ID/g) was localized in F98(EGFR) gliomas compared with 33.2%ID/g after direct i.t. injection and 12.3%ID/g in F98(WT) gliomas. On the basis of these observations, we have concluded that CED is more effective than i.t. injection as a way to deliver boronated EGF to EGFR (+) gliomas for boron neutron capture therapy.  (+info)

Asymmetric borane reduction of prochiral ketone using chiral bis(alpha, alpha-diphenyl-2-pyrrolidinemethanol) carbonate. (7/130)

Chiral bis(alpha, alpha-diphenyl-2-pyrrolidinemethanol) carbonate (DPP(2).H(2)CO(3)) is a useful asymmetric auxiliary for the asymmetric borane reduction of prochiral ketones. Chiral DPP(2).H(2)CO(3) is recoverable from the reaction and directly reusable for the reaction. The intermediate of KUR-1246, which we are developing as a new uterine relaxant, was synthesized using the methodology.  (+info)

Diastereoselective solid-phase radical addition to oxime ether anchored to polymer support. (8/130)

Stereocontrol in radical reactions of oxime ether anchored to polymer support was studied. Highly diastereoselective solid-phase radical reaction was achieved by using triethylborane and diethylzinc as a radical initiator at low reaction temperature, providing a novel method for the synthesis of the alpha-amino acid derivatives with excellent diastereoselectivities.  (+info)

... Published by QYResearch at researchbeam.com . Global Boron Trifluoride Phenol Industry 2016 Deep Market Research Report is a research report by Key Manufacturers, Applications, Developments and Trends with covering regions China, US, Europe & Japan
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This page contains information on the chemical Boron trifluoride acetic acid complex, liquid including: 1 synonyms/identifiers; U.S. Code of Federal Regulations Title 49 Section 172 shipping regulations and proper shipping name; USDOT 2008 Emergency Response Guidebook initial response information.
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Additional investigations showed that other solvents were unsatisfactory, and both Pt and ammonia borane were essential for the hydrogenation reaction (table S3, entries 10 to 14). The loading of ammonia borane can be reduced to three equivalents without appreciable diminution in efficiency (table S4, entries 16 and 17). The use of 8 atm H2 to replace ammonia borane afforded 3a in only 37% yield (table S4, entry 18), suggesting that generation of the Pt-H species through alcoholysis of ammonia borane is more efficient than direct Pt-promoted H2 dissociation. Other borane sources, including borane tetrahydrofuran complex, borane dimethyl sulfide complex, (CH3)3N·BH3, (CH3)2NH·BH3, and tBuNH2·BH3 were inferior or exhibited no activity despite longer reaction times (table S4, entries 19 to 23). These results corroborate the critical role of Pt1/CeO2 and ammonia borane in the stereoselective hydrogenation of diazo compounds to E-hydrazones. The Pt1/CeO2 catalyst can be recycled five times with a ...
Tris(pentafluorophenyl)borane, 95%, ACROS Organics™ 5g; Glass bottle Tris(pentafluorophenyl)borane, 95%, ACROS Organics™ Boronic Acids and Derivatives
A series of new π-conjugated N→B-ladder boranes has been prepared in high yield by two-fold hydroboration of bifunctional quaterpyridine-, pyrimidine-, and 1,5-naphthyridine-based precursors with 9H-BBN and Piers borane ((C6F5)2BH). The structures of the several ladder-boranes have been confirmed by X-ray c
Alfa Chemistry is the worlds leading provider for special chemicals. We offer qualified products for 753-53-7(acetic acid--boron trifluoride),please inquire us for 753-53-7(acetic acid--boron trifluoride).
Over the years, Ive probably had more hits on my Sand Wont Save You This Time post than on any other single one on the site. That details the fun you can have with chloride trifluoride, and believe me, it continues (along with its neighbor, bromine trifluoride) to be on the Things I Wont Work With list. The only
see article for more reactions. Abstract. trans-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates undergo ring-opening rearrangement and the Nef reaction in the presence of BF3 OEt2 to give aroylmethylidene malonates. The products are potential precursors for heterocycles, such as imidazoles, quinoxalines, and benzo[1,4]thiazines.. ...
Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and full protective clothing. Evacuate area endangered by gas. Do not get water inside container. Move container from fire area if you can do it without risk. Stay away from ends of tanks. Cool containers that are exposed to flames with water from the side until well after fire is out. Isolate area until gas has dispersed.Extinguish with dry chemical, carbon dioxide, water spray, fog, or foam ...
BF3 based mixtures for selectively etching thin layers of silicon dioxide over silicon for use in the plasma etch process for integrated circuits manufacture is disclosed. In the process, when trace amounts of formaldehyde are added to the etch system the rate on oxide inceases markedly. The effect on the silicon is not substantial. The optional addition of an inert diluent gas did not substantially change these results.
Hydrogen is a potentially ideal alternative energy source for both environmental and economic reasons. The development of sustainable, efficient, and economical catalysts towards hydrogen generation from hydrogen storage materials (e.g., ammonia borane, AB) has been one of the active and challenging research
The N?D stretching region in the infrared spectrum of the ammonia complex of tris-(2-methoxymethyl-phenol)-borane containing one D atom has been examined. The N?D bands have been hole burned, and the resulting spectra reveal the reorientation kinetics of the ammonia. The ammonia is hydrogen bonded with the bond distances and reorientation barrier typical of other compounds. The N?D stretching frequencies are higher than those of comparison compounds.. ...
About 80% of this chapter is devoted to the particularly rich structural chemistry of boron. There are sections on elemental boron, metal and non-metal borides, boranes and carboranes, boric acids, and borates. In the section on boranes and carboranes, electron-counting rules are introduced to account for the relationship between the bonding and structures of these compounds. For the remaining Group 13 elements, there are sections on their organometallic compounds with novel features (such as bridged structures, M-M bonding, π bonding, etc.) and on naked anionic metalloid clusters. ...
The synthesis and structural analysis of two novel families of three-component reversible redox cycles [(C2B9H11)M(m-SPh)2]2nPPNn (M = Mo, n = 2-, 2; 1-, 3; 0, 4; and M = W, n = 2-, 6; 1-, 7; 0, 8), where the cleavage and re-formation of the carborane cage C-C bond is observed during the redox reaction, are reported. Electronic saturation of the metal center (18e center) and the lack of bulky substituents on the carborane cage suggest that the deformed carborane cages in 2·PPN2, 6·PPN2, and 7·PPN invoke a new kind of deformed cage (semicloso framework). The XPS results show that the unprecedented competition for electron density between the metal center and the carborane cage is involved in the cleavage and formation of the carborane C-C bond. ...
The Biginelli reaction is a multiple-component chemical reaction that creates 3,4-dihydropyrimidin-2(1H)-ones 4 from ethyl acetoacetate 1, an aryl aldehyde (such as benzaldehyde 2), and urea 3. It is named for the Italian chemist Pietro Biginelli. This reaction was developed by Pietro Biginelli in 1891. The reaction can be catalyzed by Brønsted acids and/or by Lewis acids such as copper(II) trifluoroacetate hydrate and boron trifluoride. Several solid-phase protocols utilizing different linker combinations have been published. Dihydropyrimidinones, the products of the Biginelli reaction, are widely used in the pharmaceutical industry as calcium channel blockers, antihypertensive agents, and alpha-1-a-antagonists. The reaction mechanism of the Biginelli reaction is a series of bimolecular reactions leading to the desired dihydropyrimidinone. According to a mechanism proposed by Sweet in 1973 the aldol condensation of ethylacetoacetate 1 and the aryl aldehyde is the rate-limiting step leading to ...
A process is provided for producing wear-resistant boride layers on metal material surfaces. The process is characterized in that a boron halide selected from the group comprising boron trifluoride, b
Reaction of 4-(1-hydroxy-1-methylethyl)-3-cyclohexen-1-one with a 5-substituted resorcinol in the presence of boron tribromide, boron trifluoride or stannic chloride provides, depending upon the durat
The structure of 2,3,7,8-tetramethyl-2,3,7,8-tetracarbadodecaborane(12) [(CH3)4C4B8H8], a carborane formed by air oxidation of [(CH3)2C2B4H4] 2CoH or [(CH3)2C2B4H4] 2FeH2, has been determined from a single-crystal x-ray diffraction study. The molecule is a distorted icosahedron, in which two carbon-carbon bonds have been severed to create two four-sided open faces, and consists of two pyramidal (CH3)2C2B4H4 units fused face-to-face with the four skeletal carbon atoms forming a contiguous chain. The polyhedral cage contains two more electrons than the icosahedral C2B10H12 system and is isoelectronic with the C2B10H12 2- ion. The geometry of (CH3)4C4B8H8 differs sharply from those of the only other structurally established 12-vertex nido systems, (C6H5)2C2B10H 11 - and (η5-C5H5)Fe(CH3) 4C4B7H8, each of which has a single large open face. The compound crystallizes in the monoclinic space group P21/n with a = 8.398 (3) Å, b = 11.420 (5) Å, c = 13.458 (7) Å, β = 90.61 (4)°, dobsd = 1.05 g cm-3, and
Zuschriften DOI: 10.1002/ange.201001198 Organocatalysis Metal-Free Catalytic Boration at the b-Position of a,b-Unsaturated Compounds: A Challenging Asymmetric Induction** Amadeu Bonet, Henrik Gulys,* and Elena Fernndez* Dedicated in memory of Lszl Gulys. Enantioenriched a-chiral boron compounds were first obtained using chiral rhodium-phosphine complexes from the catalytic hydroboration of prochiral alkenes.[1] There are three reasons why metal-mediated asymmetric induction in C B bond formation is more successful than existing methods involving interactions between the substrate and a chiral borane reagent[2] in the absence of a metal: 1) the low cost/ availability of the achiral borane reagent, 2) the milder reaction conditions, and, most importantly, 3) the possibility for optimization and maximization of the asymmetric induction by screening the chiral ligands. Considerable progress has since been made, particularly in relation to the enantioselective metal-mediated hydroboration,[3] ...
A possible solution is to store hydrogen in a safe chemical form. Earlier this year, Williams and his team figured out a way to release hydrogen from an innocuous chemical material - a nitrogen-boron complex, ammonia borane - that can be stored as a stable solid. Now the team has developed a catalyst system that releases enough hydrogen from its storage in ammonia borane to make it usable as a fuel source. Moreover, the system is air-stable and re-usable, unlike other systems for hydrogen storage on boron and metal hydrides. The research was published this month in the Journal of the American Chemical Society.. ...
This is unique source of information on the chemicals manufactured and imported in Europe. It covers their hazardous properties, classification and labelling, and information on how to use them safely.. REACH. ...
The previously known anion [(C6F5)(3)B(mu-OH)B(C6F5)(3)](-) (2) has been prepared by a two-step procedure, involving deprotonation of (C6F5)(3)BOH2 to give [B(C6F5)(3)OH](-) (1), followed by addition of B(C6F5)(3). The solution structure and the dynamics of 2 have been investigated by H-1 and F-19 NMR spectroscopy. The reaction of [NHEt3]2 with NEt3 resulted in the formation of [NHEt3](+)[(C6F5)(3)BOH](-), [NHEt3](+)(C6F5)(3)[BH](-), and (C6F5)(3)B-(CH2CH=N+Et2). This indicates that in the presence of a nucleophile anion 2 can dissociate to B(C6F5)(3) and 1. The reaction of [HDMAN]2 with 1,8-bis(dimethylamino) naphthalene (DMAN) confirmed this trend. In the presence of water, 2 transformed into the adduct [(C6F5)(3)BO(H)(HO)-O-...(H)B(C6F5)(3)](-) (3), containing the borate 1 hydrogen-bonded to a water molecule coordinated to B(C6F5)(3). The same compound is formed by treating (C6F5)(3)BOH2 with 0.5 equiv of a base. A competition study established that for 1 the Lewis acid-base interaction with ...
Chemists in the US have developed a simple reaction to make ammonia borane - a powder more hydrogen-dense than even liquid hydrogen. Their one-pot synthesis of this promising hydrogen storage material is reported in the first issue of the new Royal Society of Chemistry journal Energy & Environmental Science.. Hydrogen has significant benefits as a fuel of the future: potentially renewable and sustainable, and, as hydrogen fuel cells emit only water, a green alternative to other more polluting fuels.. Storing hydrogen safely is tricky, however - pressurising hydrogen gas is clearly dangerous for everyday use, and it can only be stored as a liquid under cryogenic conditions.. Chemists like Tom Autrey from Pacific Northwest National Laboratory, US, are addressing the problem by designing materials to store hydrogen safely, such that it can be released at will to power a fuel cell.. Ammonia borane (AB) is a stable white powder which releases hydrogen gas upon heating. Its use as a hydrogen storage ...
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Conversion of Carbon Dioxide to Few‑Layer Graphene. Chakrabarti, A.; Lu, J.; Skrabutenas, J.C.; Xu, T.; Xiao, Z.; Maguire, J.A.; Hosmane, N.S.(2011) J. Mater. Chem., 21: 9491-9493.. Nano and Dendritic Structured Carboranes and Metallacarboranes: From Materials to Cancer Therapy. Hosmane, N. S.; Yinghuai, Z.; Maguire, J. A.; Kaim, W.; Takagaki, M. (2009) J. Organomet. Chem., 694: 1690-1697.. Synthesis, Characterization and Polymerization of a Neutral Tantalacarborane Sandwich Complex Derived from Quintanionic exo‑Polyhedrally Linked Bis(C2B10‑carborane) Ligands. Yinghuai, Z.; Nong, L. C.; Zhao, L. C.; Widjaja, E.; Hwei, C. S.; Cun, W.; Tan, J.; Van Meurs, M.; Hosmane, N. S.; Maguire, J. A. (2009) Organometallics, 28: 60-64.. Silicon (IV) and Germanium (IV) Moieties Stabilized by Charge‑Compensated Carborane Ligand, [9‑SMe2‑7,8‑C2B9H10]−: Synthetic and Structural Investigation. Vladimir Meshcheryakov, V.; Zheng, C.; Kudinov, A. R.; Maguire, J. A.; Hosmane, N. S.(2008) ...
Import Data And Price Of Pinacol Ester , www.eximpulse.com Eximpulse Services will provide you the latest and relevant market intelligence reports of Pinacol Ester Import Data. You can find live data of maximum number of ports of India which is based on updated shipment data of Indian Customs. Only previous two days data will be seen on website. You can use this Pinacol Ester import data for multiple kinds of analysis; lets say Import price, Quantity, market scenarios, Price trends, Duty optimization and many more. You can go through some of the sample shipment records for Pinacol Ester import data mentioned above. Here on Eximpulse Services you will get all kind of free sample as well as detailed reports of Export/ Import data as per your requirement. To get in touch for any kind of enquiry related to free sample or detailed report contact on +91-120-408-4957, +91-120-408-4958,+91-120-428-4019.. Data post 2012 as per Notification No.18/2012 - Customs(N.T.) and does not have names of Indian ...
The olefin cross metathesis reaction has been sequenced with four common organic transformations in a one-pot manner to rapidly access useful building blocks. Those reactions are: (1) phosphorus-based olefination (e.g., Wittig and Horner- Wadsworth-Emmons); (2) hydride reduction; (3) Evans propionate aldol reaction; and (4) Brown allyl- and Roush crotylboration. The products of these reactions include stereodefined 2,4-dienoates, trans allylic alcohols, syn-propionate aldols and chiral non- racemic homoallylic alcohols, respectively, which can be carried further in the context of chemical synthesis. Two approaches toward the total synthesis of cytotoxic polyketide natural product (+)-crocacin C have been accomplished. The first-generation approach used a Crimmins aldol reaction and reagent-controlled double asymmetric crotylboration (Brown and Roush) reaction, which was not selective. The first-generation approach was replaced altogether with a second that afforded (+)-crocacin C in 10 steps ...
The Hampton D. Smith Collection collection contains research and lab tests pertaining to the formation of undiscovered carboranes and nitriles created by Smith and other collaborators. The collection contains raw data spanning a period of over fifteen years (1974-1990), and several formal proposals pertaining to theories developed from that data. The correspondence is primarily between Smith and chemists at other prominent universities and colleges, and discuss the possible theories regarding the synthesis and formation of carboranes. ...
Borane, stabilized by the bicyclic guanidine hppH, undergoes a thermal B-N dehydrocoupling reaction to give the diborane [H2B(hpp)]2. Catalytic B-B dehydrocoupling gives in high yield [HB(hpp)]2 with a direct B-B bond. We tested several catalysts to find the optimal conditions. With the best catalysts, we achieve complete transformation to [HB(hpp)]2 at 110 °C in less than 40 min.. ...
You may also wish to search for items by Herrero. 7 matching references were found. Lago, A.F.; Jimenez, P.; Herrero, R.; Dávalos, J.Z.; Abboud, J.-L.M., Thermochemistry and Gas-Phase Ion Energetics of 2-Hydroxy-4-methoxy-benzophenone (Oxybenzone), J. Phys. Chem. A, 2008, 112, 14, 3201-3208, https://doi.org/10.1021/jp7111999 . [all data] Herrero, R.; Davalos, J.Z.; Abboud, J.L.M.; Alkorta, I.; Koppel, I.; Koppel, I.A.; Sonoda, T.; Mishima, M., The intrinsic (gas-phase) acidities of bridgehead alcohols - An experimental (FT-ICR) and computational study, 5Int. J. Mass Spectrom., 2007, 267, 1-3, 302-307, https://doi.org/10.1016/j.ijms.2007.02.056 . [all data] Hurtado, M.; Yanez, M.; Herrero, R.; Guerrero, A.; Davalos, J.Z.; Abboud, J.L.M.; Khater, B.; Guillemin, J.C., The Ever-Surprising Chemistry of Boron: Enhanced Acidity of Phosphine center dot Boranes, Chem. Eur. J., 2009, 15, 18, 4622-4629, https://doi.org/10.1002/chem.200802307 . [all data] Davalos, J.Z.; Guerrero, A.; Herrero, R.; Jimenez, ...
In a comment to my post on putting out fires last week, one commenter mentioned the utility of the good old sand bucket, and wondered if there was anything that would go on to set the sand on fire. Thanks to a note from reader Robert L., I can report that there is indeed such a reagent: chlorine trifluoride. I have not
Living polymer synthesis methods for the synthesis of oligomeric and high molecular weight polymers with low polydispersity are disclosed. The disclosed methods are based on the discovery that the reaction of a ylid with an organoborane at a high ylid:borane ratio and high temperature provides for the synthesis of high molecular weight polymers with low polydispersity.
Schiff bases are used as ligands to form complexes with metals and borane and such complexes have application in non-linear optical dyes (Rodríguez et al., 2012; Reyes et al., 2004) and as anion sensors (Hijji et al., 2009; Muñoz et al. 2008). Related structures were reported by (Gül et al., 2007; Muñoz et al., 2008; Valkonen et al., 2012; Hijji et al., 2014).. The title compound is a Schiff base prepared by the reaction of 4-di-methyl-amino-benzaldehyde with 2-amino-5-nitro-phenol under microwave conditions.It crystallized with two molecules (A and B) in the asymmetric unit, Fig. 1. Each molecule adopts an E conformation about the C=N imine bond: C7A═N2A in A and C7B═N2B in B. The two molecules in the asymmetric unit have minor differences in their conformations: In molecule A the dihedral angle between the nitro group (N1A/O2A/O3A) and its benzene ring (C1A-C6A) is 2.1 (2)° and between the two benzene rings (C1A-C6A and C8A-C13A) is only 0.88 (7)°, while for molecule B the ...
Two members of the poly-m-carboranesiloxane family were selected for extensive testing to determine their ppotential in high temperature applications between 500 and 900 F. Efforts were concentrated on an insoluble raw gum which lends itself primarily to molding operations; its synthesis was developed into a routine operation. Volatile loss determinations, long term heat-aging studies, compression set tests, shrinkage and electrical property measurements were conducted on variably compounded vulcanizates. Their tensile strength and elongation could be improved by increased filled loading in conjunction with modified molding techniques. End use items such as O-rings and other seals, diaphragms and electrical connector inserts are now undergoing application testing. For coatings and related uses, a soluble viscous liquid form is best suited and can be easily applied on metals or fabrics from aromatic solvents. Curing does not require peroxides and is achieved between 300 and 600 F. (Author)(*BORANES
A cobalt-based alloy electroless plating solution according to the present invention comprises a cobalt precursor, a tungsten precursor, a phosphorus precursor, a reducing agent, a complexing agent, a pH regulator and a stabilizer, in which the reducing agent is dimethylamine borane (DMAB) or borohydride and the stabilizer is one or more compounds selected from a group consisting of imidazole, thiazole, triazole, disulfide and their derivatives; and which is stable enough for long-term reuse and prevents deterioration of metal thin-film quality by inhibiting the formation of a precipitate.
Strontium amidoborane, Sr(NH2BH3)2, is synthesized by gently milling the powder mixtures of SrH2 and ammonia borane (in a 1:2 molar ratio), followed by ...
N-Acyl imidazoles and catalytic isothiourea hydrochloride salts function as ammonium enolate precursors in the absence of base. Enantioselective Michael addition-cyclization reactions using different α,β-unsaturated Michael acceptors have been performed to form dihydropyranones and dihydropyridinones with high stereoselectivity. Detailed mechanistic studies using RPKA have revealed the importance of the "imidazolium" effect in ammonium enolate formation and have highlighted key differences with traditional base-mediated processes ...
We demonstrate an efficient protocol for the chemoselective hydroboration of organic nitriles with pinacolborane (HBpin) and catecholborane (HBcat) using aluminum alkyl complex [κ2‐{2‐F‐C6H4NP(Se)Ph2}2Al‐(Me)] as a pre‐catalyst to afford diboryl amines under solvent‐free and mild conditions (60°C) in high yield. The aluminum complex was prepared by the reaction of [2‐F‐C6H4NHP(Se)Ph2] and trimethylaluminum in toluene. The solid‐state structure of Al complex is established. Nitriles with a wide array of electron‐withdrawing and electron‐donating functional groups were easily converted to the desired products through the formation of aluminum hydride as an active species. A kinetic study of the catalytic reaction is also reported.. ...
Alfa Aesar is a leading manufacturer and supplier of research chemicals, pure metals and materials for a wide span of applications.
Ammonia borane (AB) has attracted tremendous interest for on-board hydrogen storage due to its low molecular weight and high gravimetric hydrogen capacity below a moderate temperature. However, the slow kinetics, irreversibility, and formation of volatile materials (trace borazine and ammonia) limit its practical application. In this paper, a new catalytic strategy involved lithium (U) catalysis and nanostructure confinement in mesoporous carbon (CMK-3) for the thermal decomposition of AB is developed. AB loaded on the 5% Li/CMK-3 framework releases similar to 7 wt% of hydrogen at a very low temperature (around 60 degrees C) and entirely suppresses borazine and ammonia emissions that am harmful for proton exchange membrane fuel cells. The possible mechanism for enhanced hydrogen release via catalyzed thermal decomposition of AB is discussed ...
Sigma-Aldrich offers a diverse array of hard and soft Lewis acids from the traditional titanium tetrachloride and boron trifluoride to Montmorillonite powders.
Chemical Name , CAS** , TQ** ________________________________________,_____________,_____________ , , Acetaldehyde............................, 75-07-0 , 2500 Acrolein (2-Propenal)..................., 107-02-8 , 150 Acrylyl Chloride........................, 814-68-6 , 250 Allyl Chloride.........................., 107-05-1 , 1000 Allylamine.............................., 107-11-9 , 1000 Alkylaluminums.........................., Varies , 5000 Ammonia, Anhydrous......................, 7664-41-7 , 10000 Ammonia solutions (greater than 44 , , percent ammonia by weight)............, 7664-41-7 , 15000 Ammonium Perchlorate...................., 7790-98-9 , 500 Ammonium Permanganate..................., 7787-36-2 , 7500 Arsine (also called Arsenic Hydride)...., 7784-42-1 , 100 Bis(Chloromethyl) Ether................., 542-88-1 , 100 Boron Trichloride......................., 10294-34-5 , 2500 Boron Trifluoride......................., 7637-07-2 , 250 Bromine................................., 7726-95-6 , 1500 ...
Nitronium tetrafluoroborate is an inorganic compound with formula NO2BF4. It is a salt of nitronium cation and tetrafluoroborate anion. It is a colorless crystalline solid, which reacts with water to form the corrosive acids HF and HNO3. As such, it must be handled under water-free conditions. It is sparsely soluble in many organic solvents. Nitronium tetrafluoroborate can be prepared by adding a mixture of anhydrous hydrogen fluoride and boron trifluoride to a nitromethane solution of nitric acid or nitrogen pentoxide. Nitronium tetrafluoroborate is used as a nitration agent. Kenneth Schofield (1980). Aromatic nitration. CUP Archive. p. 88. ISBN 0-521-23362-3 ...
Novelty, in brief, is represented by the intended elaboration of carborane, heteroborane and metallaborane compounds as active-site inhibitors of CA isoenzymes. All currently used inhibitors anhydrase inhibitors contain a sulfonamide or a sulfamate moiety connected to so called ring structure which is usually a 5- or 6-membered aromatic ring or conjugated ring system containing nitrogen, oxygen, and/or sulfur heteroatoms. The ring structure bears characteristics or functionality which modulates the affinity toward certain CA isoform. The use of three-dimensional boron cluster is a novel approach in development of isoform-specific CA inhibitors. Selected sulfamides incorporating cluster with inhibitory effects toward CAs (IC50 values in low micromolar and submicromolar range, some of the inhibitors being more than 50-times more selective toward the tumor specific CAIX than for CAII abundantly present in normal tissues ...
p - (q -Cyclopentadienyl)-p-[1-37-(2-methylallyl)] bis (triphenylphosphanepalladium) ( 2 a ) Triphenylphosphane (141 mg, 0.54mmol) in toluene (5 ml) was added to a solution of C&17PdC5H5 (122mg, 0.54mmol) in toluene (10ml) under nitrogen. The mixture was stirred for 3 h at room temperature, the color changing from deep red to orange. After removal of half the solvent and addition of pentane (10ml) the mixture was kept at -30°C for 24h. Orange-yellow crystals were formed; they were filtered, washed with pentane and dried in .high vacuum. Yield 85 %. Received: September 30, 1974 [Z 151 IE] German version: Angew. Chem. 87,205 (1975) [ l ] Part 17 of the series: Studies of the Reactivity of Metal x-Complexes. This work was supported by the Schweizerischer Nationa1fonds.-Part 16: Ref. [ 121. Structural investigation^[^] on the complexes (2) and (3) show a great similarity of the sulfur oxide difluoride imide group with the isoelectronic thiazyl trifluoridel4I. It was already known that NSF3 can ...
BrF3 is the chemical formula for bromine trifluoride. Bromine trifluoride is a hazardous liquid chemical compound that is created when a single bromine atom bonds with three atoms of...
Novel telechelic olefin and hydroxy polymers particularly those of polyisobutylene are prepared according to the process set forth herein. Preparation of a telechelic diolefin polyisobutylene includes the steps of refluxing a solution of telechelic dihalogen polyisobutylene, adding a solution of a strong base such as potassium t-butoxide and stirring to form the telechelic diolefin polyisobutylene. This telechelic diolefin can be converted to the telechelic dihydroxy by refluxing a solution of the former, hydroborating the diolefin to a polymeric borane and oxidizing the polymeric borane to form the telechelic dihydroxy polyisobutylene. The processes are also applicable to the conversion of trihalogenated polyisobutylenes to telechelic triolefin and trihydroxy polyisobutylene tristars.
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Background Carbon monoxide (CO) synthesized by heme oxygenase 1 (HO-1) exerts antinociceptive effects during inflammation but its role during neuropathic pain remains unknown. Our objective is to investigate the exact contribution of CO derived from HO-1 in the modulation of neuropathic pain and the mechanisms implicated. Methodology/Principal Findings We evaluated the antiallodynic and antihyperalgesic effects of CO following sciatic nerve injury in wild type (WT) or inducible nitric oxide synthase knockout (NOS2-KO) mice using two carbon monoxide-releasing molecules (CORM-2 and CORM-3) and an HO-1 inducer (cobalt protoporphyrin IX, CoPP) daily administered from days 10 to 20 after injury. The effects of CORM-2 and CoPP on the expression of HO-1, heme oxygenase 2 (HO-2), neuronal nitric oxide synthase (NOS1) and NOS2 as well as a microglial marker (CD11b/c) were also assessed at day 20 after surgery in WT and NOS2-KO mice. In WT mice, the main neuropathic pain symptoms induced by nerve injury were
|p|Boronic acids and their esters are highly considered compounds for the design of new drugs and drug delivery devices, particularly as boron-carriers suitable for neutron capture therapy. However, these compounds are only marginally stable in water. Hydrolysis of some phenylboronic pinacol esters is described here. The kinetics is dependent on the substituents in the aromatic ring. Also the pH strongly influences the rate of the reaction, which is considerably accelerated at physiological pH. Therefore, care must be taken when considering these boronic pinacol esters for pharmacological purposes. |inline-formula||alternatives| [...] |/alternatives||/inline-formula||/p|
1-methyl-1h-IMIDAZOLE-2-boronic acid pinacol ester(CAS:553651-31-3),supplier of 1-methyl-1h-IMIDAZOLE-2-boronic acid pinacol ester(CAS:553651-31-3) ,inquiry for 1-methyl-1h-IMIDAZOLE-2-boronic acid pinacol ester(CAS:553651-31-3)
Indole-4-boronic acid, pinacol ester 388116-27-6 MSDS report, Indole-4-boronic acid, pinacol ester MSDS safety technical specifications search, Indole-4-boronic acid, pinacol ester safety information specifications ect.
A series of compounds containing one or more dimesitylboryl groups (mesityl = 2,4,6-trimethylphenyl) has been synthesised. Triarylboranes were synthesised by reaction of dimesitylfluoroborane with an appropriate lithium reagent. Dimesitylvinyl boranes were synthesised by the hydroboration of an appropriate terminal alkyne with dimesitylborane. Compounds were characterised by standard analytical techniques, and investigated by single crystal X-ray diffraction, optical, thermal and electrochemical methods. The aim of the research was to determine whether such compounds might be useful in the field of organic electronics. In addition, the compound dimesitylborane has been investigated by NMR techniques, which have shown it to exist as a monomer 一 dimer equilibrium in solution, and the structure of the dimer in the solid state has been more accurately determined using neutron diffraction. ...
Abstract. An intermolecular pinacol coupling of aromatic or aliphatic carbonyl compounds catalyzed by a complex of samarium diiodide (SmI2) with tetraglyme in the presence of Me2SiCl2 and Mg is described. High diastereoselectivity has been achieved in reactions with aliphatic and aromatic aldehydes. De values of up to 99% have been achieved in intramolecular pinacol coupling reactions.. ...
Aldrich-663743; trans-1-Hexen-1-ylboronic acid pinacol ester 0.97; CAS No.: 126688-97-9; Synonyms: (E)-2-(1-Hexenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane; trans-1-Hexenylboronic acid pinacol ester; Linear Formula: C12H23BO2
Mechanisms of reactions of the frustrated Lewis pairs (FLPs) with carbon dioxide (CO2) and hydrogen (H2) are studied by using quantum chemical modelling. FLPs are relatively novel chemical systems in which steric effects prevent a Lewis base (LB) from donating its electron pair to a Lewis acid (LA). From the main group of the periodic table, a variety of the electron pair donors and acceptors can create an FLP and the scope of the FLP chemistry is rapidly expanding at present. Representative intermolecular FLPs are phosphines and boranes with bulky electron-donating groups on phosphorus and bulky electron-withdrawing groups on boron - e.g., the tBu3P/B(C6F5)3 pair. The intramolecular FLPs feature linked LB and LA centers in one molecule.. Investigations of the FLP reaction mechanisms were carried out using the transition state (TS) and the potential energy surface (PES) calculations plus the Born-Oppenheimer molecular dynamics (BOMD) as an efficient and robust implementation of general ab initio ...
Meola, Giuseppe; Braband, Henrik; Jordi, Sara; Fox, Thomas; Blacque, Olivier; Spingler, Bernhard; Alberto, Roger (2017). Structure and reactivities of rhenium and technetium bis-arene sandwich complexes [M(η6-arene)2]+. Dalton Transactions, 46(42):14631-14637.. Barman, Samir; Remhof, Arndt; Koitz, Ralph; Iannuzzi, Marcella; Blacque, Olivier; Yan, Yigang; Fox, Thomas; Hutter, Jürg; Züttel, Andreas; Berke, Heinz (2017). Post-Synthesis Amine Borane Functionalization of a Metal-Organic Framework and Its Unusual Chemical Hydrogen Release Phenomenon. Chemistry - A European Journal, 23(37):8823-8828.. Santoro, Giuseppe; Beltrami, Ruben; Kottelat, Emmanuel; Blacque, Olivier; Bogdanova, Anna Yu; Zobi, Fabio (2016). N-Nitrosamine-{cis-Re[CO]2}(2+) cobalamin conjugates as mixed CO/NO-releasing molecules. Dalton Transactions, 45(4):1504-1513.. Li, Yan; Blacque, Olivier; Fox, Thomas; Luber, Sandra; Polit, Walther; Winter, Rainer F; Venkatesan, Koushik; Berke, Heinz (2016). Electronic communication in ...
Nitrogen trifluoride is 17,000 times more virulent than CO2, and SF6, the most treacherous greenhouse gas, is over 23,000 times more threatening. The solar photovoltaic industry is one of the fastest-growing emitters of these gases, which are now measurably accumulating within the earths atmosphere according to the U.S. National Oceanic and Atmospheric Administration (NOAA). A NOAA study shows that atmospheric concentrations of SF6 have been rising exponentially. A paper published in the peer-reviewed journal Geophysical Research Letters documents that atmospheric NF3 levels have been rising 11 percent per year.. If photovoltaic production grows, so will the associated side effects, claims Zehner. Even worse, theres no evidence that solar cells offset fossil fuel use in the American context. Zehner explains that alternative energy subsidies keep retail electricity costs incrementally lower, which then spurs demand. Its a boomerang effect, remarks Zehner. The harder we throw alternative ...
Methyl ricinoleate 4 and methyl 13(S)-hydroxyoctadeca-9(Z),11(E)-dienoate 7 were subjected to epoxidation using mCPBA, or tert-butyl hydroperoxide in the presence of vanadyl acetylacetonate or titanium (IV) isopropoxide with D-(-)- or L-(+)-diisopropyl tartrate. Epoxidations using mCPBA gave equal quantities of the disatereoisomeric epoxides 5/6 and 8/9 from 4 and 7 respectively. Other methods gave preferentially epoxides 5 or 8, except for treatment of 7 with tert-butyl hydroperoxide in the presence of titanium (IV) isopropoxide and L-(+)-diisopropyl tartrate which gave preferentially epoxide 9. Hydroxy-derivative 4, 7, 5, 6, 8 and 9 were converted into the fluoro-derivatives 16 - 21 by trimethylsilylation and treament with diethylaminosulphur trifluoride. Epoxides 6 and 9 were converted into 2-oxazolines 22 and 23 respectively by reaction with acetamide.. ...
Schiff bases of 3-formyl chromones have attracted much attention due to their biological functions such as enzyme inhibition (Khan et al. 2009; Tu et al. 2013). Here we report the crystal structure of the title compound, which was obtained from the condensation reaction of 6,8-dichloro-3-formylchromone with 1-naphthylmethylamine and successive reduction with 2-picoline borane. The structure shows that the H atom of the -OH group is transferred to the N1 atom of the imine, thus forming a zwitterion. As a result, an intramolecular O···H-N [O2···N1 = 2.795 (2) Å], rather than O-H···N, hydrogen bond is formed. The bond distances O2-C3 [1.245 (3) Å], C3-C2 [1.431 (3) Å], C2-C10 [1.377 (3) Å] and C10-N1 [1.329 (3) Å] and torsion angles O2-C3-C2-C10 [3.2 (3)°] and C3-C2-C10-N1 [-2.4 (3)°] in the six-membered ring indicate charge delocalization among the atoms. This effect might be responsible for the preferential reduction of the α,β-unsaturated carbonyl of the synthetic intermediate, ...
The three main goals of the research discussed in this dissertation were (1) to expand and characterize the first extensive series of half-sandwich metallatricarbadecaborane complexes, (2) to synthesize and explore the reactivity of 5-TfO-B10H13, and (3) to investigate metal-catalyzed hydrogen release from ammonia borane in ionic liquids. The major achievements are outlined below. Chapter 1 describes the synthesis and structural characterization of the first series of group 9 tricarbadecaboranyl half-sandwich complexes. The tricarbadecaboranyl ligands in these complexes exhibit properties distinct from their cyclopentadienyl analogs, including (1) strong electron-withdrawing properties, (2) the ability to readily form slipped-cage structures, and (3) the ability to stabilize lower metal oxidation states. The unique properties of these complexes mean they could find potential applications as, for example, catalysts for alkyne oligomerizations, polymer and dendrimer building blocks, and synthetic
Doug Rees had his first experience with electron transfer processes in microbes as an undergraduate studying cytochrome in Neurospora with Carolyn W. Slayman at Yale College where he completed his BS in Molecular Biophysics and Biochemistry in 1974. In 1980 he received a PhD in Biophysics, determining crystal structures of carboxypeptidase A with William Lipscomb at Harvard. While there he also became acquainted with multi-center electron-sharing bonds (e.g. in boranes). During a two year postdoctoral appointment at the University of Minnesota with James B. Howard, he successfully produced the first crystals of the nitrogenase iron protein from Azotobacter vinelandii. He has continued his work with several nitrogenases and has had a productive collaboration with Jim Howard for 35 years.. Professor Rees joined the faculty of the Department of Chemistry and Biochemistry at UCLA in 1982 and moved to Caltech in 1989. He is a member of the American Academy of Arts and Sciences and the National ...
A regioselective hydroboration of alkynes has been developed by using commercially available zinc triflate as a catalyst, in the presence of catalytic amount of NaBHEt3. The reaction tolerates a wide range of terminal alkynes having several synthetically useful functional groups and proceeds regioselectively to furnish hydroborated products in moderate to excellent yields. This system shows moderate chemoselectivity towards terminal C equivalent to C bond over terminal and internal C=C bond and internal C equivalent to C bond.. ...
The ability of alkali metal complexes featuring functionalized BINOL-derived ligands to catalyze ketone hydroboration reactions was explored. The reduced products were formed in excellent yield and with variable enantioselectivities dependent upon the nature of the ligand and the alkali metal cation.. ...
[65 Pages Report] Check for Discount on Pyridazine-3-boronic acid pinacol ester Global Market and Forecast Research report by ChemReport. DescriptionWe provide independent and unbiased information on manufacturers, prices, production...
Lisätietoa aiheesta 1H-Pyrazole-3-boronic acid pinacol ester. Me mahdollistamme tieteen tekemisen tarjoamalla käyttöösi kattavan tuotevalikoiman, hyvän palvelun, toimivat prosessit ja osaavat ihmisemme.
May cause respiratory irritation.. P261-P264b-P270-P271-P280-P301+P312-P302+P352-P304+P340-P305+P351+P338-P312-P330-P332+P313-P362-P501c. H302-H315-H319-H335. TSCA : No. Recommended Storage : Ambient temperatures. ...
Romanski, Steffen, Stamellou, Eleni, Jaraba, J. T., Storz, D., Krämer, B. K., Hafner, M., Amslinger, Sabine, Schmalz, Hans-Günther und Yard, Benito (2013) Enzyme-triggered CO-releasing molecules (ET-CORMs): Evaluation of biological activity in relation to their structure. Free Radic. Biol. Med. 65, S. 78-88 ...
View Notes - 25 from CHEM 1000 at Lethbridge College. Chemistry 1000 Lecture 25: Group 14 and Boron Marc R. Roussel Group 14 In this group again, we see a full range of nonmetallic to metallic
This report published in Communicable Diseases Intelligence Volume 30, No 4, December 2006 contains an analysis and tables of monthly notifiable diseases and laboratory data, and quarterly surveillance reports.
We, China 2-(4-Methylpiperazin-1-yl)pyridine-5-boronic acid pinacol ester Manufacturers, China 2-(4-Methylpiperazin-1-yl)pyridine-5-boronic acid pinacol ester Suppliers, provide quality 2-(4-Methylpiperazin-1-yl)pyridine-5-boronic acid pinacol ester product and the products related with China 2-(4-Methylpiperazin-1-yl)pyridine-5-boronic acid pinacol ester - bjpurechem
The hydroboration of aldehydes and ketones using a silica-supported zirconium catalyst is reported. Reaction of Zr(NMe 2) 4 and mesoporous silica nanoparticles (MSN) provides the catalytic material Zr(NMe 2) [email protected] Exhaustive characterization of Zr(NMe 2) [email protected] with solid-state (SS)NMR and infrared spectroscopy, as well as through reactivity studies, suggests its surface structure is primarily ≡SiOZr(NMe 2) 3. The presence of these nitrogen-containing zirconium sites is supported by 15N NMR spectroscopy, including natural abundance 15N NMR measurements using dynamic nuclear polarization (DNP) SSNMR. The Zr(NMe 2) [email protected] material reacts with pinacolborane (HBpin) to provide Me 2NBpin and the material ZrH/[email protected] that is composed of interacting surface-bonded zirconium hydride and surface-bonded borane ≡SiOBpin moieties in an approximately 1:1 ratio, as well as zirconium sites coordinated by dimethylamine. The ZrH/[email protected] is characterized by 1H/ 2H and 11B SSNMR and infrared spectroscopy and ...
The generation and isolation of two novel borenium cations has been described. The observation that the reaction of the Lewis acid B(C6F5)3 and the Lewis base diazabicyclo[2.2.2]octane (DABCO) with pinacol borane (HBpin ...
Sjuvarsson E, Damaraju VL, Mowles D, Sawyer MB, Tiwari R, Agarwal HK, Khalil A, Hasabelnaby S, Goudah A, Nakkula RJ, Barth RF, Cass CE, Eriksson S, Tjarks W. Cellular influx, efflux, and anabolism of 3-carboranyl thymidine analogs: potential boron delivery agents for neutron capture therapy. J Pharmacol Exp Ther. 2013 Nov;347(2):388-97 ...
amphidinolide D: a cytotoxic macrolide from Amphidinium; RN (from CA Index Guide 1989) refers to amphidinolide B (epimer of amphidinolide D); structure given in first source
Maleimide-functionalized closo-dodecaborate albumin conjugates (MID-AC): Unique ligation at cysteine and lysine residues enables efficient boron delivery to tumor for neutron capture therapyMaleimide-functionalized closo-dodecaborate albumin conjugates (MID-AC): Unique ligation at cysteine and lysine residues enables efficient boron delivery to tumor for neutron capture therapy ...
Bismuth(V) fluoride is a white crystalline solid. It is an extremely strong oxidizing agent and fluorinating agent, something that adds fluoride ions to other chemicals. It reacts with water to make ozone and oxygen difluoride. It also reacts with iodine and sulfur at room temperature. Above 50°C, it reacts with hydrocarbons like paraffin to make fluorocarbons. At 180°C, it reacts with chlorine to make chlorine monofluoride and with bromine to make bromine trifluoride.. ...
TY - GEN. T1 - Ammonium borohydride. T2 - Solid hydrogen storage material with highest gravimetric hydrogen content. AU - Karkamkar, Abhi. AU - Heldebrant, David J.. AU - Linehan, John. AU - Autrey, Tom. PY - 2009. Y1 - 2009. N2 - Various options for hydrogen storage are being studied ranging gases (hydrogen), liquids (e.g., methanol) to solids (e.g., lithium borohydride, boranes and amides). However, no single material today meets all the required technical targets. Here we report the synthesis, structure and hydrogen desorption properties of a unique hydrogen storage material, i.e., one that stores hydrogen on both the cation and anion, ammonium borohydride. Further we show the compound releases greater than 20 wt% hydrogen in three steps at temperatures less than 180 °C and provide evidence that NH4BH4 crystallizes at room temperature and standard pressure in a rock-salt structure. The experimental lattice parameters provide an estimate of the volumetric density, ca. 154 g Hydrogen/liter of ...
TY - JOUR. T1 - Identification of a novel boron-containing antibacterial agent (AN0128) with anti-inflammatory activity, for the potential treatment of cutaneous diseases. AU - Baker, Stephen J.. AU - Akama, Tsutomu. AU - Zhang, Yong Kang. AU - Sauro, Vittorio. AU - Pandit, Chetan. AU - Singh, Rajeshwar. AU - Kully, Maureen. AU - Khan, Jehangir. AU - Plattner, Jacob J.. AU - Benkovic, Stephen J.. AU - Lee, Ving. AU - Maples, Kirk R.. PY - 2006/12/1. Y1 - 2006/12/1. N2 - A series of borinic acid picolinate esters were synthesized and screened for their minimum inhibitory concentration (MIC) against Gram-positive and -negative bacteria. Our lead compounds were then screened for anti-inflammatory activity. From these studies, we identified 3-hydroxypyridine-2-carbonyloxy-bis(3-chloro-4-methylphenyl)borane (2g, AN0128) as having the best combination of anti-bacterial and anti-inflammatory activities. This compound is now in clinical development for dermatological conditions.. AB - A series of ...
0143]In dimethyl sulfoxide (52 mL) was dissolved (7S)-7-(tert-butoxycarbonylamino)-7-methyl-5-azaspiro[2.4]heptane (13.4 g, 54.5 mmol); 6,7-difluoro-1-[(1R,2S)-2-fluorocyclopropyl]-8-methoxy-1,4-dihydro-4-oxoq- uinoline-3-carboxylic acid-difluoro borane complex (17.9 g, 49.5 mmol); and triethylamine (8.97 mL, 64.4 mmol). And this solution was heated and stirred in an oil bath at 40° C. for 17 hours. This reaction solution was poured into cold water (1000 mL), and precipitated solid was filtered. To this solid was added a mixed solution (180 mL) of ethanol and water in the ratio of 5 to 1, and triethylamine (15 mL); and this solution was heated under reflux for 1.5 hours. The reaction mixture was dried under reduced pressure and thus-obtained residue was dissolved in ethyl acetate (150 mL×2), and washed with 10% citric acid aqueous solution (200 mL), water (200 mL), and saturated brine (100 mL). The organic layer was dried over anhydrous sodium sulfate. Then the solvent was removed under ...
1. ACGIH [1971]. Pentaborane. In: Documentation of the threshold limit values for substances in workroom air. 3rd ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 197.. 2. AIHA [1966]. Emergency exposure limits. American Industrial Hygiene Association, Toxicology Committee. Am Ind Hyg Assoc J 27:193-195.. 3. Jacobson KH [1958]. Toxicity of borane fuels. In: Transactions of the symposium on health hazards of military chemicals. Army Chemical Center, MD: U.S. Army Chemical Warfare Laboratories, Directorate of Medical Research. CWL Special Publication 2-10, pp. 55-60.. 4. Levinskas GJ, Paslian MR, Bleckman WR [1958]. Chronic toxicity of pentaborane vapor. Am Ind Hyg Assoc J 19:46-53.. 5. Weeks MH, Burke DG, Bassett EE, Johnson JR, Christensen MK [1964]. Pentaborane: relationship between inhaled lethal and incapacitating dosages in animals. J Pharmacol Exp Ther 145:382-385.. 6. Weir FW, Seabaugh VM, Mershon MM, Burke DG, Weeks MH [1964]. Short exposure inhalation ...
Carboranes. Doctoral thesis, Durham University.. HARDMAN, SARAH,JEAN (2011) Synthesis and Blend Behaviour of Multi-End Capped Polyethylene. Doctoral thesis, Durham University.. HARGREAVES, ALEXANDER,LEIGHTON (2016) Optical Deformation of Microdroplets at Ultralow Interfacial Tension. Doctoral thesis, Durham University.. HARGREAVES, NATASHA,JAYNE (2016) Crystallisation of nano-quartz and nano-graphite from microemulsions under ambient conditions. Doctoral thesis, Durham University.. HARRISSON, PETER (2011) Developing and Understanding Iridium-Catalysed Arene Borylation. Doctoral thesis, Durham University.. HARSANYI, ANTAL (2016) Elemental Fluorine for the Greener Synthesis of Life-Science Building Blocks. Doctoral thesis, Durham University.. HART, JAMES,MICHAEL (2017) The study of filled rubber composites with rheology and neutron scattering. Doctoral thesis, Durham University.. HARVEY, PETER (2013) Paramagnetic Probes for Magnetic Resonance. Doctoral thesis, Durham University.. HEMMING, DAVID ...
Transmission of Light to the Young Primate Retina: Possible Implications for the Formation of Lipofuscin. Gaillard, E.R.; Merriam, J.; Zheng, L.; Dillon, J. (2011) Photochem. Photobiol., 87: 18-21.. Compositional Studies of Human RPE Lipofuscin: mechanisms of molecular modifications. Murdaugh, L.S.; Mandal, S.; Dillon, J.; Simon, J.D.; Gaillard, E.R. (2011) J. Mass Spectrom., 46: 90-95.. Compositional Studies of Human RPE Lipofuscin. Murdaugh, L.S.; Avalle, L.B.; Mandal, S.; Dillon, J.; Simon, J.D.; Gaillard, E.R. (2010) J. Mass Spectrom., 45: 1139-1147.. Carborane‐Appended C3‐Symmetrical Extended π‐Systems: Synthesis and Properties. Hosmane, N.; Dash, B.; Satapathy, R.; Gaillard, E.R.; Maguire, J. (2010) J. Am. Chem. Soc., 132: 6578-6587.. Age‐Related Accumulation of 3‐nitrotyrosine and nitro‐A2E in Human Bruchs Membrane. Murdaugh, L.S.; Wang, Z.; Del Priore, L.V.; Dillon, J.; Gaillard, E.R. (2010) Exp. Eye Res., 90: 564-571.. Physical Properties of the Lipid Bilayer Membrane made ...
Optically gathering organoboron composites are principal ingredients for pharmaceuticals and running materials such as fluid crystals. In rare, because heightens with an oxygen atom be bountying very penny-pinching to a boron atom can mellow the basic systematize for panaceas, researchers there the universe receive contended to broaden a method to synthesize such fusions. However, famed eluded them because of tribulations associated with depicting catalysts.. The inquiry team led by Professor Hajime Ito of Hokkaido Universitys Graduate Commence of Engineering, who struggled in synthesizing optically occupied organoboron coalesces by the borylation of aldehydes a few years ago, acclimated to ketone exacerbates in this delve into. Ketone systematizes are considered to be assorted difficult than aldehydes to use in asymmetric combinations.. The band has been recapturing catalysts to synthesize optically capable organoboron paratheses since it described a method for the borylation of intrinsic ...
Absolute rate constants for radical additions to alkenes in solution. The synergistic effect of perfluorination on the reactivities of n-alkyl radicals
May cause respiratory irritation.. P261-P264b-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P332+P313-P362-P501c. H315-H319-H335. TSCA : No. Recommended Storage : Ambient temperatures. ...
Boron is critical to the growth and health of crops but is needed in small amounts, making it crucial for boron to be delivered evenly in the field.
We have appointed a team of qualified and experienced professionals from different field of science. Team of our professionals comprises of experienced procuring agents, quality experts, warehousing & packaging personnel, delivery agents and other skilled & non skilled labours". ...
5. Mechanisms of Stereocontrol for Doubly Silylene-Bridged Cs- and C1-Symmetric Zirconocene Catalysts for Propylene Polymerization. Synthesis and Molecular Structure of Li2[(1,2-Me2Si)2{C5H2-4-(1R,2S,5R-menthyl)}{C5H-3,5-(CHMe2)2)}]•3THF and [(1,2-Me2Si)2{η5-C5H2-4-(1R,2S,5R-menthyl)}{η5-C5H-3,5-(CHMe2)2}] ...
Boron (3mg) information including description from Natures Way, supplement facts, and suggested use. Order online for quick delivery at the best prices.
Skychemical is a chemistry synthesis service provider located in the Zhangjiang Hi-Tech park, Pudong district, Shanghai, China. We focus on provide Heterocyclic Building Blocks...
Ever heard of boron? Probably not because boron is not a popular supplement that many men consider. Nevertheless, boron has…. Continue Reading →. ...
Boron Neutron Capture Therapy (BNCT) is an experimental radiation therapy technique which is based on the principle of irradiating boron atoms with neut
20 November 2017 - RaySearch and Sumitomo Heavy Industries, Ltd. (Sumitomo), based in Tokyo, Japan, have entered into an agreement regarding treatment planning for boron neutron capture therapy (BNCT) - a unique type of radiation therapy that targets cancer at the cellular level. The agreement extends the existing cooperation between Sumitomo and RaySearch on proton therapy. Sumitomo has developed the worlds first accelerator-based clinical BNCT system and is conducting clinical trials regarding recurrent head-and-neck and brain cancers in Japan. Treatment planning is an essential aspect of BNCT, and Sumitomo selected RayStation because of its advanced capabilities and usability. Under the agreement, RayStations functionality will be extended to support BNCT planning requirements*. BNCT will be an additional treatment modality in RayStation, alongside the existing options for photon, electron, proton, and carbon ion therapy. Users of BNCT will have access to the full range of advanced ...
A new target concept termed Discs Incorporating Sector Configured Orbiting Sources (DISCOS), is proposed for spallation applications, including BNCT (Boron Neutron Capture Therapy). In the BNCT application a proton beam impacts a sequence of ultra thin lithium DISCOS targets to generate neutrons by the {sup 7}Li(p,n){sup 7}Be reaction. The proton beam loses only a few keV of its {approximately}MeV energy as it passes through a given target, and is re-accelerated to its initial energy, by a DC electric field between the targets.
0030] When the FDA-approved 10B-BPA is used as a boron drug in the BNCT for treating tumors, the ratio of boron concentrations accumulated in the tumor and the adjacent to normal organs must be evaluated by using 18F-BPA Positron Emission Tomography (PET) first. In other words, if a boron drug that is similar to 10B-BPA (high T/N ratio) is developed for use in the BNCT for treating liver cancer, this step of labeling the boron drug with radioisotope (such as 18F) and evaluating the boron drug T/N ratio by PET cannot be avoided. But in the present invention, boric acid is used as a boron drug in the BNCT for treating liver cancer, which does not require the step of labeling the boron drug with radioisotope or evaluating the boron drug T/N ratio by PET. This is due to the fact that boric acid does not result in specific accumulation in the soft tissues of a living creature, so the boron concentrations in a patients blood and in the liver tumor are approximately equal. Consequently, it is not ...
Summary of Facts and Submissions. I. European patent application No. 00 936 887.9 (publication No. WO 00/76557) was refused by a decision of the examining division of 29 August 2005 on the basis of Article 97 EPC on the grounds of lack of inventive step under Article 56 EPC.. II. The following documents were inter alia cited during the proceedings before the examining division and the board of appeal:. (1) J.-L.A. Shih and R.M. Brugger: Neutron induced brachytherapy: A combination of neutron capture therapy and brachytherapy Medical Physics, vol. 19, no. 2, March/April 1992, pages 369-375. (2) EP-A-0 857 470. (3) US-A-5 840 009. (4) US-A-5 947 889. (4a) DE-A-196 00 669. III. The decision was based on claims 1-19 of the main request filed with letter dated 15 January 2002 (entry into the European phase).. Independent claims 1 of the main request before the examining division read as follows:. 1. A stent for neutron capture therapy, the stent comprising a body portion fabricated from a material ...
EXTRACT: Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF6) and nitrogen trifluoride (NF3) are potent greenhouse gases (GHGs), which can be collectively described as Kyoto Protocol synthetic GHGs (KP-SGGs). HFCs are used extensively in Australia, largely in air conditioning and refrigeration, initially as ozone-friendly replacements for chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). Minor uses of HFCs in Australia are as aerosol propellants, including metered dose inhalers (MDIs), as foam blowing agents and in fire extinguishers. PFCs are a by-product of the production of aluminium in Australia and overseas and, in addition, are used overseas in the electronics industry during the manufacture of integrated circuits and plasma screens. Refrigeration represents a very minor use of PFCs in Australia and overseas. Sulfur hexafluoride is used extensively in the electricity distribution industry, both in Australia and overseas, for dielectric insulation ...
Combined Cryogenic Transmission Electron Microscopy and Electron Spin Resonance Studies of Egg Phosphatidylchloline Liposomes Loaded with a Carboranyl Compound Intended for Boron Neutron Capture Therapy ...
Boron is needed by life. In 2013, a hypothesis suggested it was possible that boron and molybdenum catalyzed the production of RNA on Mars with life being transported to Earth via a meteorite around 3 billion years ago.[115]. There exists one known boron-containing natural antibiotic, boromycin, isolated from streptomyces.[116][117]. Boron is an essential plant nutrient, required primarily for maintaining the integrity of cell walls. However, high soil concentrations of , 1.0 ppm lead to marginal and tip necrosis in leaves as well as poor overall growth performance. Levels as low as 0.8 ppm produce these same symptoms in plants that are particularly sensitive to boron in the soil. Nearly all plants, even those somewhat tolerant of soil boron, will show at least some symptoms of boron toxicity when soil boron content is greater than 1.8 ppm. When this content exceeds 2.0 ppm, few plants will perform well and some may not survive. When boron levels in plant tissue exceed 200 ppm, symptoms of boron ...
The iodine-catalyzed Prins cyclization of homoallylic alcohols and aldehydes was investigated under metal-free conditions and without additives. Anhydrous conditions and inert atmosphere are not required. The reaction of 2-(3,4-dihydronaphthalen-1-yl)propan-1-ol and 21 aldehydes (aliphatic and aromatic) in CH2Cl2 in the presence of 5 mol % of iodine gave 1,4,5,6-tetrahydro-2H-benzo[f]isochromenes in 54%-86% yield. Under similar conditions, the Prins cyclization of six alcohols containing an endocyclic double bond (primary, secondary, or tertiary) led to dihydropyrans in 52%-91% yield. The acyclic homoallylic alcohols gave 4-iodo-tetrahydropyran in 29%-41% yield in the presence of 50 mol % of iodine. This type of substrate is the main limitation of the methodology. The relative configuration of the products was assigned by NMR and X-ray analysis. The mechanism and the ratio of the products are discussed, based on DFT calculations.
Boranes. Science.marshall.edu. Retrieved 2014-10-02.. ...
In order to prevent hydroboration across both the pi-bonds, a bulky borane like disiamyl (di-sec-iso-amyl) borane is used. ... In the first step, borane (BH3) adds to the double bond, transferring one of the hydrogen atoms to the carbon adjacent to the ... Alkyl migration to oxygen gives the alkyl borane with retention of stereochemistry (in reality, the reaction occurs via the ... Hawthorne, M. F. (1961). "Amine Boranes. VIII. The Hydroboration of Terminal Olefins, Dienes and Terminal Acetylenes with ...
Among the geometric isomers, one with chirality was the first borane to be resolved into its separate enantiomers, and was only ... Octadecaborane is an inorganic compound, a borane with chemical formula B18H22. It is a colorless flammable solid, like many ... Heřmánek, S.; Plešek, J. (1970). "Chemistry of boranes. XXI. Resolution of iso-octadecaborane to optical enantiomers". ... This compound was the first borane found to have multiple isomeric forms. ...
Brown, H. C. (1975). Organic Syntheses via Boranes. New York: John Wiley & Sons. ISBN 0-471-11280-1.. ... diborane: reducing agent, rocket fuel, semiconductor dopant, catalyst, used in organic synthesis; also borane, pentaborane and ...
The steric demand of 9-BBN greatly suppresses the formation of the 2-substituted isomer compared to the use of borane. Brown, H ... 9-BBN is also known by its nickname 'banana borane'. This is because rather than drawing out the full structure, chemists often ... 5-cyclooctadiene and borane usually in ethereal solvents, for example: The compound is commercially available as a solution in ... C. (1975). Organic Syntheses via Boranes. New York: John Wiley & Sons. ISBN 0-471-11280-1. Stix, Gary. "The Straight Dope: A Q& ...
This will strip off borane to combine with the Lewis base, and let two methyl borane molecules dimerise. Methyldiborane can ... and can be imagined as methyl borane (CH3BH2) bound to borane (BH3). Other combinations of methylation occur on diborane, ... As with other boranes it exists in the form of a dimer with a twin hydrogen bridge that uses three-center two-electron bonding ... A gas chromatograph can be used to determine the amounts of the methyl boranes in a mixture. The order they pass through are ...
Brown, H. C. (1975). Organic Syntheses via Boranes. New York: John Wiley & Sons. ISBN 0-471-11280-1. A. Dedieu (Editor) ... borane, BH3 aluminium: alumane, AlH3 gallium: gallane, GaH3 indium: indigane, InH3 thallium: thallane, TlH3 carbon: alkanes, ... also borane, pentaborane and decaborane arsine: used for doping semiconductors stibine: used in semiconductor industry ...
More methylated boranes are less stable. 1,2-Dimethyldiborane slowly converts to 1,1-dimethyldiborane. Methylborane hydrolyzes ... Isadore Shapiro, C. O. Wilson, J. F. Ditter, W. J. Lehmann (1961). Borax to Boranes (PDF). Advances in Chemistry Series. 32. ... By treating monomethyldiborane with ether, dimethyl ether borane (CH3)2O.BH3 leaving methylborane which rapidly dimerises to 1, ... by Borane: the Intimate Mechanism of an Alkyl Transfer Reaction". Journal of the American Chemical Society. 104 (9): 2361-2365 ...
It reacts with ammonia to form the diammoniate of diborane, DADB, with lesser quantities of ammonia borane depending on the ... further confirmed the molecular structure of boranes using X-ray crystallography in the 1950s, and developed theories to ... H. C. Brown (1975). Organic Synthesis via Boranes. New York: John Wiley. ISBN 0-471-11280-1. International Chemical Safety Card ...
The latter involved an extension of the Wade's Rules for polyhedral boranes to macropolyhedral boranes and the Huckel 4n+2 Rule ... The Jemmis mno rules for polyhedral boranes have found a place in textbooks and are being taught in Inorganic Chemistry Courses ... Shameema, O.; Jemmis E. D. (2008). "Orbital Compatibility in the Condensation of Polyhedral Boranes". Angew. Chem. Int. Ed. 47 ... Jemmis, E. D.; Balakrishnarajan M. M. (2001). "Polyhedral Boranes and Elemental Boron: Direct Structural Relations and Diverse ...
... the higher boranes and borane anions, and various transition-metal carbonyl cluster compounds". J. Chem. Soc. D. 1971: 792-793 ... as is the case for many boranes and carboranes. For such clusters, the structures are based on deltahedra, which are polyhedra ... provides electron counting rules useful for predicting the structures of clusters such as borane and carborane clusters. The ... A Graph-Theoretical Interpretation of the Bonding Topology in Polyhedral Boranes, Carboranes, and Metal Clusters". J. Am. Chem ...
... s are classes of boranes, at least one boron atom is replaced by another element. Like many of the related boranes ... Carborane Azaborane "Polyhedral Boranes" (PDF). Mit. Retrieved 22 December 2016. ...
Jemmis mno rule provides the relationship between polyhedral boranes, condensed polyhedral boranes and β-rhombohedral boron. ... the higher boranes and borane anions, and various transition-metal carbonyl cluster compounds". J. Chem. Soc. D (15): 792. doi: ... Jemmis mno rule is an extension of Wade's rule, generalized to include condensed polyhedral boranes as well. The first ... They were formulated by Eluvathingal Devassy Jemmis to explain the structures of condensed polyhedral boranes such as B20H16, ...
Formally it can be derived from a hypothetical borane called dodecaborane B12H14. It is isoelectronic in structure with the ... Another high yield method heats triethylamine borane with diborane at a temperature of 180 °C. Yet another heats pentaborane at ... Kiremire E. M. (2014). Numerical Sequence of Borane Series. Orient J Chem ;30(3). Lipping, Lauri; Leito, Ivo; Koppel, Ivar; ... Miller, H. C.; Muetterties, E. L. (1967). "Borane Anions". Inorganic Syntheses. Inorganic Syntheses. 10: 81-91. doi:10.1002/ ...
Borane and diborane. Left: BH3 (special conditions), covalent metalloid hydride. Right: B2H6 (standard conditions), dimeric ...
Borane and diborane. Left: BH3 (special conditions), covalent metalloid hydride. Right: B2H6 (standard conditions), dimeric ...
These borane sulfide adducts are stable at room temperature and soluble in ethers and dichloromethane. Borane adducts with ... Another advantage of these borane complexes is that it is possible to recover the amine carriers. A way of producing borane in ... This significant rate difference in producing di- and tri-alkyl boranes is useful in the synthesis of bulky boranes that can ... The related borane dimethylsulfide complex BH3S(CH3)2 (BMS) is comparatively more convenient because it is more stable and it ...
Atkins, Jr., William J.; Burkhardt, Elizabeth R.; Matos, Karl (2006). "Safe Handling of Boranes at Scale". Org. Process Res. ...
"Callery Borane Products , Callery.com , Callery". Callery. 2017-03-05. Retrieved 2017-03-05. Binger, P.; Köster, R., "Sodium ...
Superaromaticity Fullerene chemistry Carborane Boranes Hirsch, Andreas; Chen, Zhongfang; Jiao, Haijun (2000), "Spherical ... polyhedral boranes. In 2000, Andreas Hirsch and coworkers in Erlangen, Germany, formulated a rule to determine when a fullerene ...
... borane → LiBH 4 ( CH 3 BO ) 3 {\displaystyle {\ce {3CO}}+1.5\ \overbrace {{\ce {B2H6}}} ^{{\ce {borane}}}\ {\ce {->[{\ce {LiBH4 ... Brown, H.C. Boranes in Organoc Chemistry; Cornell University Press: Ithaca, 1972; pp. 346-347. Hall, Dennis G. (2005). Boronic ... A more recent synthesis of trimethylboroxine involves the reaction of carbon monoxide with borane (B2H6) and lithium ...
They found out that the chiral amino alcohols would react with borane to form aloxyl-amine-borane complexes. The complexes are ... under the name Alpine Borane and the asymmetric reduction of carbonyl groups with either enantiomer of Alpine-Borane is known ... Organoboron chemistry Reactions of organoborates and boranes Corey-Itsuno reduction Midland Alpine borane reduction Petasis ... In 1987, E. J. Corey and co-workers found out that the formation of oxazaborolidines from borane and chiral amino alcohols. And ...
It is an obscure member of the boranes. It is a colorless liquid that, like most boron hydrides, is readily hydrolyzed and ...
The hydrides of Boron are called boranes B2H6. The names of the saturated hydrides of non-metals end with the suffix -ane The ...
NHCs and boranes form stable NHC borane adducts. Triethylborane adducts can be synthesised directly from the imidazolium salt ... With boranes the mode of action is the same, the hydrogen adds to the most substituted carbon because boron is less ... Borane hydrides such as 9-BBN and L-selectride (lithium tri-sec-butylborohydride) are reducing agents. An example of an ... Boranes react rapidly to alkenes in a process called hydroboration. This concept was discovered by Dr. Herbert Charles Brown, ...
H. C. Johnson; T. N. Hooper; A. S. Weller (2015). "The Catalytic Dehydrocoupling of Amine-Boranes and Phosphine-Boranes". Top. ... This type of reaction is illustrated by the stepwise conversion of ammonia borane to discrete rings and oligomers, which upon ...
Borane definition, any of the compounds, both neutral and anionic, of boron and hydrogen with formulas ranging from B 2 H 6 to ...
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database ...
Murphy, M.K.; Beauchamp, J.L., Fluorine and Alkyl Substituent Effects on Gas-Phase Lewis Acidities of Boranes by ICR ... Workman, D.B.; Squires, R.R., Hydride Binding Energies of Boranes, Inorg. Chem., 1988, 27, 11, 1846, https://doi.org/10.1021/ ...
The larger boranes all consist of boron clusters that are polyhedral. In addition to the charge-neutral boranes, a large number ... PSEPT (Wades rules) can be used to predict the structures of boranes. Interest in boranes increased during World War II due to ... Borane, BH3, a highly reactive and rarely observed borane. Diborane, B2H6 Tetraborane, B4H10 Pentaborane-[9], B5H9 Decaborane-[ ... It is the precursor to the higher boranes. It has been studied extensively. The higher boranes are thought to arise via thermal ...
Dehydrogenation of amine-boranes or dehydrocoupling of amine-boranes is a chemical process in main group and organometallic ... 5 rather than the typically seen cyclic dimers from other amine-borane dehydrogenations. When catalyzing ammonia-borane ... Secondary amine-boranes dehydrogenate to form cyclic dimers, or monomeric aminoboranes in the case of more bulky groups on the ... Ammonia borane has attracted particular interest due to its high weight percent of hydrogen (19.6%). Dehydrogenation occurs in ...
S-Alpine-Borane® 97%; CAS Number: 42371-63-1; Synonym: B-Isopinocampheyl-9-borabicyclo[3.3.1]nonane; Linear Formula: C18H31B; ... S-Alpine-Borane® 97% Synonym: B-. Isopinocampheyl-. 9-. borabicyclo[3.3.1]. nonane ... S-Alpine-Borane® may be used in the preparation of (-)-(4S)-5-methyl-2-hexyn-4-ol, an intermediate for the synthesis of (+)- ... S-Alpine-Borane® is a chiral reducing agent, synthesized from (-)-α-pinene via hydroboration. ...
The selected boranes are ammonia borane NH3BH3 (AB), hydrazine borane N2H4BH3 (HB), hydrazine bisborane N2H4(BH3)2 (HBB), ... H interactions with four to five borane anions. The main results are presented and discussed herein. ... Boranes of low molecular weight are crystalline materials that have been much investigated over the past decade in the field of ... The selected boranes are ammonia borane NH3BH3 (AB), hydrazine borane N2H4BH3 (HB), hydrazine bisborane N2H4(BH3)2 (HBB), ...
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
Borane Ammonia Complex H3N-BH3 bulk & research qty manufacturer. Properties, SDS, Applications, Price. Free samples program. ... Borane Ammonia Complex Synonyms. Ammonia borane; Amminetrihydroboron; Borazane; azane, borane; borane amine; borane ammonia; ... Borane ammonia complex. CAS-No. 13774-81-7. Revision Date. New Jersey Right To Know. Components. Borane ammonia complex. CAS-No ... About Borane Ammonia Complex. Borane Ammonia Complex is generally immediately available in most volumes. American Elements ...
Lithium Ammonia Borane LiNH2 • BH3 bulk & research qty manufacturer. Properties, SDS, Applications, Price. Free samples program ... About Lithium Ammonia Borane. Lithium Ammonia Borane is generally immediately available in most volumes. High purity, submicron ... Related Applications, Forms & Industries for Lithium Ammonia Borane. Hydrides. Hydrogen Storage. Research & Laboratory. ...
boranes. using CO2 J. Wu and N. Hazari, Chem. Commun., 2011, 47, 1069 DOI: 10.1039/C0CC03191G ...
2-aminoethoxy)(diphenyl)borane. Regulatory process names 1 IUPAC names 1 Other identifiers 1 ...
This page contains information on the chemical Borane, trifluoro-, dihydrate including: 5 synonyms/identifiers; U.S. Code of ... Borane, trifluoro-, dihydrate. Identifications. *CAS Number: 13319-75-0*Synonyms/Related:*Borane, trifluoro-, dihydrate*Boron ... Borane, trifluoro-, dihydrate (EnvironmentalChemistry.com),/a,- This page contains information on the chemical Borane, ... Chemical Database - Borane, trifluoro-, dihydrate. EnvironmentalChemistry.com. 1995 - 2018. Accessed on-line: 4/19/2018. https ...
When dissolved in ionic liquids, the borane solutions exhibit ignition delay times which are superior to any known hypergolic ... These borane-ionic liquid solutions appear to be the bri ... Borane compounds which are hydrogen storage materials are ... borane. solutions exhibit ignition delay times which are superior to any known hypergolic ionic liquids. . These borane. - ... boranes. as hypergolic fluids H. Gao and J. M. Shreeve, J. Mater. Chem., 2012, 22, 11022 DOI: 10.1039/C2JM31627G ...
Dispose of contents/container in accordance with local/regional/national/international regulations.. Danger. DOTInformation : Transport Hazard Class: 4.1; Packing Group: III; Proper Shipping Name: FLAMMABLE SOLIDS, CORROSIVE, ORGANIC, N.O.S.. RTECSNumber : IP9450000. TSCA : TSCA. ...
We predicted stability of hydrogen clathrates of ammonia borane at ambient pressure and T=77~K. Further stabilization by ... The concept of hierarchical hydrogen storage is illustrated by clathrates built from ammonia borane (AB) and loaded with ... Abstract: D30.00013 : Hydrogen clathrates of ammonia borane. 5:18 PM-5:30 PM. ...
Boranes containing two to 20 atoms of boron per molecule are known. The simplest borane, BH3, does not exist in a free... ... Find out information about Boranes. compounds of boron and hydrogen. ... Boranes. Also found in: Dictionary. Boranes. compounds of boron and hydrogen. Boranes containing two to 20 atoms of boron per ... The lower boranes are gases (B2H6 and B4H10-tetraborane) and liquids (B5H9-pentaborane); the higher boranes (BioHn-decabo-rane ...
Icosahedral boranes, carboranes, and metallacarboranes are extraordinarily robust compounds with desirable properties such as ... Electrochemistry and Photoluminescence of Icosahedral Carboranes, Boranes, Metallacarboranes, and Their Derivatives. Scientific ... Electrochemistry and Photoluminescence of Icosahedral Carboranes, Boranes, Metallacarboranes, and Their Derivatives Written by ... there is a need for a review dedicated to the redox and photophysical characteristics of easily accessible borane and carborane ...
Ammonia borane, is a solid at room temperature composed of 19 weight percent hydrogen. Unfortunately, the bulk ammonia borane ... Hydrogen Storage in Ammonia Borane Ammonia borane releases a hydrogen molecule, forming polyaminoborane. Release of a second ... They have observed when ammonia borane is put into the pores of a mesoporous silica, with a pore diameter of 6.5 nanometer, the ... A team of PNNL researchers have been evaluating ammonia borane, the inorganic analog of ethane, as a potential hydrogen storage ...
Keywords: adamantylamine; adduct; borane; hydroboration; maltol adamantylamine; adduct; borane; hydroboration; maltol ►▼ ... Bourque, J.L.; Geier, S.J.; Vogels, C.M.; Decken, A.; Westcott, S.A. Synthesis and Reactivity of Novel Boranes Derived from ... Synthesis and Reactivity of Novel Boranes Derived from Bulky Salicylaldimines: The Molecular Structure of a Maltolato Compound ... Synthesis and Reactivity of Novel Boranes Derived from Bulky Salicylaldimines: The Molecular Structure of a Maltolato Compound ...
Catalytic Hydrolysis of Ammonia Borane by Cobalt Nickel Nanoparticles Supported on Reduced Graphene Oxide for Hydrogen ... with ammonia borane (AB) as the reducing agent under ambient condition. The CoNi/RGO NPs exhibits excellent catalytic activity ... catalyst to realize the production of hydrogen under mild condition gives more confidence for the application of ammonia borane ...
Both the ammonia-borane polymeric and borazine-cyclotriborazane cycles show a strong exothermic decomposition character ( ... The structural, electronic, and thermodynamic properties of ammonia-borane complexes with varying amounts of hydrogen have been ...
These were then employed as dehydrocoupling catalysts for a variety of phosphine-borane adducts. Although they were shown to be ... and phosphine-borane adducts. Chapter 1 gives a general introduction to mam group element-element bond forming reactions, ... increased catalytic activity was observed in the analogous reactions with primary phosphine-boranes. Polyphosphinoboranes of ... poor catalysts for the dehydrocoupling of secondary phosphine-boranes, ...
The most prominent FLPs are based on intramolecular phosphane-borane adducts, whose catalytic properties can be tailored over ... B indirect and direct dipole-dipole interactions for characterizing intramolecular borane-phosphane FLPs, illustrating the ...
He takes in thereon the book three dimensional aromaticity in polyhedral boranes and between ofmarket and the dress of reliable ... Book Three Dimensional Aromaticity In Polyhedral Boranes And Related Molecules. The Web check you revealed is always a ... The book three dimensional aromaticity in polyhedral boranes and related is unsubscribe done. Your father were a performance ... unsubscribe book three dimensional aromaticity in polyhedral boranes and related molecules we sent In 300 data in today, ...
  • First Atropo-Enantioselective Ring Opening of Achiral Biaryls Containing Lactone Bridges with Chiral Hydride-Transfer Reagents Derived from Borane. (docme.ru)
  • With the combination of chiral borane and tri- tert -butylphosphine as an FLP catalyst, an asymmetric Piers-type hydrosilylation of simple ketones was successfully realized to give the desired secondary alcohols with up to 90% ee . (sioc-journal.cn)
  • B8H16 which is trigonal prismatic klado- (from the Greek for "branch") conjuncto- 2 or more of the above are fused together, e.g., the edge or two vertex fused B19H221−, face or three vertex fused B21H181−, and four vertex fused B20H16 Boranes are electron-deficient and pose a problem for conventional descriptions of covalent bonding that involves shared electron pairs. (wikipedia.org)
  • At any rate, at IRC ~8, this hidden intermediate now decides to transfer a hydride to form the alkyl borane rather than to become an explicit intermediate. (imperial.ac.uk)
  • The reactivity of ammonia-borane (AB) dimers is investigated using ab initio simulations to determine the most active pathways leading to H 2 evolution. (confex.com)
  • When dissolved in ionic liquids , the borane solutions exhibit ignition delay times which are superior to any known hypergolic ionic liquids . (rsc.org)
  • Well dispersed magnetically recyclable bimetallic CoNi nanoparticles (NPs) supported on the reduced graphene oxide (RGO) were synthesized by one-step in situ coreduction of aqueous solution of cobalt(II) chloride, nickel (II) chloride, and graphite oxide (GO) with ammonia borane (AB) as the reducing agent under ambient condition. (hindawi.com)
  • In addition to the charge-neutral boranes, a large number of anionic boron hydrides are known. (wikipedia.org)
  • Carboxylic acid - Carboxylic acid - Reduction: Although carboxylic acids are more difficult to reduce than aldehydes and ketones, there are several agents that accomplish this reduction, the most important being lithium aluminum hydride (LiAlH4) and borane (BH3). (schilderoord.nl)
  • Mechanism of the reduction of a carboxylic acid by borane: revisited and revised. (imperial.ac.uk)
  • A case for doing so might be my post of about a year ago , addressing why borane reduces a carboxylic acid, but not its ester, where I suggested a possible mechanism. (imperial.ac.uk)
  • If that is the case, then this explains why borane reduces only a carboxylic acid and not an ester. (imperial.ac.uk)
  • This review covers various approaches and prospects of facilitating thermolysis, along with a brief discussion of the nature of ammonia borane and the regeneration of spent fuel. (kaist.ac.kr)
  • Boranes of low molecular weight are crystalline materials that have been much investigated over the past decade in the field of chemical hydrogen storage. (mdpi.com)
  • The concept of hierarchical hydrogen storage is illustrated by clathrates built from ammonia borane (AB) and loaded with molecular hydrogen. (aps.org)
  • The sulfonium borane "is one of the rare molecular systems competent for cyanide sensing at the sub-parts-per-million level in water," the researchers write. (acs.org)
  • Ammonia borane (AB) has attracted tremendous interest for on-board hydrogen storage due to its low molecular weight and high gravimetric hydrogen capacity below a moderate temperature. (edu.au)
  • It acts as a borane source for oxazaborolidine catalyzed asymmetric reductions. (fishersci.ca)
  • The four series of single-cluster boranes have the following general formulae, where "n" is the number of boron atoms: There also exists a series of substituted neutral hypercloso-boranes that have the theoretical formulae BnHn. (wikipedia.org)
  • unsubscribe book three dimensional aromaticity in polyhedral boranes and related molecules we sent In 300 data in today, necessary of whom have your cases or Reunion existing for spiritual dissertation. (earthdrum.com)
  • The larger boranes all consist of boron clusters that are polyhedral. (wikipedia.org)
  • MASONIC TEMPLE technical practices will particular be organizational in your book three dimensional aromaticity in polyhedral boranes of the schools you affect divided. (earthdrum.com)
  • He takes in thereon the book three dimensional aromaticity in polyhedral boranes and between ofmarket and the dress of reliable collection, evolving how labor can run come as a certain framework in the ADVERTISER of information, which is us to rediscover the other and interested list of those we assign for. (earthdrum.com)
  • Ammonia borane (AB) containing 19.6 wt % hydrogen is among the strongest candidates for hydrogen storage on-board fuel cell vehicles, though efficient means for hydrogenating the spent material are needed. (elsevier.com)
  • Among the chemical storage materials, ammonia borane is one most promising candidate because it has a high hydrogen density of 19.6 wt% and it is a non-flammable and non-explosive crystalline compound at ambient conditions. (kaist.ac.kr)
  • We recently prepared a borane-appended analogue of dppf (dppf is a wide bite-angle bis-phosphine ligand used extensively in late transition metal catalysis). (mcmaster.ca)
  • We now report atropo-enantioselective biaryl syntheses by stereoselective reduction of achiral biaryl lactones with modified boranes. (docme.ru)
  • One molecule of dba (dibenzylideneacetone) is bound between palladium and the borane of the TXPB ligand. (mcmaster.ca)
  • According to these convensions, diborane would be the simplest nido- borane, as the 2-boron framework can be considered as the simplest deltahedron, the triangular dihedron or equilateral triangle, with one vertex removed. (wikipedia.org)
  • The mol-ecular structures of tri-fluoro-methyl-substituted tri-phenyl-boranes are analysed for systematic trends and compared with structures retrieved from the Cambridge Structural Database. (iucr.org)
  • The borane engages in a tight interaction to chloro or bromo co-ligands. (mcmaster.ca)