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)
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.
Inorganic or organic compounds that contain boron as an integral part of the molecule.
Inorganic or organic salts and esters of boric acid.
Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Compounds possessing both a hydroxyl (-OH) and an amino group (-NH2).
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.
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)

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)

LaF3 Nanoparticle,LaF3 Nanopowder,Lanthanum Trifluoride Nanoparticle,Lanthanum Trifluoride Nanopowder,LaF3,LaF3 Nanoparticle supplier,LaF3 Nanopowder supplier,Lanthanum Trifluoride Nanopowder supplier,Lanthanum Trifluoride Nanoparticle supplier,LaF3 Nanoparticles,Lanthanum Trifluoride Nanoparticles,LaF3 Nanoparticle,LaF3 Nanopowder,Lanthanum Trifluoride Nanoparticle,Lanthanum Trifluoride Nanopowder,LaF3,LaF3 Nanoparticle supplier,LaF3 Nanopowder supplier,Lanthanum Trifluoride Nanopowder supplier,Lanthanum Trifluoride Nanoparticle supplier,LaF3 Nanoparticles,Lanthanum Trifluoride Nanoparticles,LaF3 Nanoparticle,LaF3 Nanopowder,Lanthanum Trifluoride Nanoparticle,Lanthanum Trifluoride Nanopowder,LaF3,LaF3 Nanoparticle supplier,LaF3 Nanopowder supplier,Lanthanum Trifluoride Nanopowder supplier,Lanthanum Trifluoride Nanoparticle supplier,LaF3 Nanoparticles,Lanthanum Trifluoride Nanoparticles,LaF3 Nanoparticle,LaF3 Nanopowder,Lanthanum Trifluoride Nanoparticle,Lanthanum Trifluoride ...
Global Boron Trifluoride Phenol Industry 2016 Deep Market Research Report 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
TY - JOUR. T1 - Effects of treatment with a carbon monoxide-releasing molecule and a heme oxygenase 1 inducer in the antinociceptive effects of morphine in different models of acute and chronic pain in mice. AU - Hervera, Arnau. AU - Gou, Gemma. AU - Leánez, Sergi. AU - Pol, Olga. PY - 2013/8/1. Y1 - 2013/8/1. N2 - Rationale: Treatment with a carbon monoxide-releasing molecule (tricarbonyldichlororuthenium(II) dimer, CORM-2) or a classical heme oxygenase 1 inducer (cobalt protoporphyrin IX, CoPP) has potent anti-inflammatory effects, but the role played by these treatments in the antinociceptive effects of morphine during acute and chronic pain was not evaluated. Objectives: In wild type (WT), neuronal (NOS1-KO), or inducible (NOS2-KO) nitric oxide synthases knockout mice, we evaluated the effects of CORM-2 and CoPP treatments in the antinociceptive actions of morphine and their interaction with nitric oxide during acute, visceral, and chronic inflammatory or neuropathic pain. Methods: Acute ...
Alfa Aesar is a leading manufacturer and supplier of research chemicals, pure metals and materials for a wide span of applications.
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.
Learn more about Boron trifluoride methanol complex. We enable science by offering product choice, services, process excellence and our people make it happen.
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
Reaction of 2-aminomethylpyridine with diphenylborinic acid in a mixture of CHCl3-diethyl ether gives diphenyl-(2-aminomethylpyridine-N,N)borane, a cyclic adduct that in presence of environmental moisture yields the N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane. The two compounds were characterized by NMR and infrared spectroscopy. The structure of N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane was confirmed by X-ray diffraction. This adduct crystallizes in monoclinic P21/n space group with unit cell dimensions: a = 13.193(2) (Å), b = 5.913(7) (Å), c = 19.604(2) (Å), = 90.295(3), V = 1529.3(3) Å3, Z = 4. The BN distance is 1.645(3) Å and lies in the range of a dative bond. The NH and OH groups are involved in intermolecular hydrogen bonds formation and they add to the stabilization of the acyclic adduct in the solid state. ...
This reaction is regioselective, Other borane derivatives can be used to give even higher regioselectivity.[10] The product trialkylboranes can be converted to useful organic derivatives. With bulky alkenes one can prepare species such as [HBR2]2, which are also useful reagents in more specialised applications. Borane dimethylsulfide which is more stable than borane-tetrahydrofuran may also be used.[11][10]. Hydroboration can be coupled with oxidation to give the hydroboration-oxidation reaction. In this reaction, the boryl group in the generated organoborane is substituted with a hydroxyl group. Reductive amination is an extension of the hydroboration-oxidation reaction, wherein a carbon-nitrogen double bond is undergoing hydroboration. The carbon-nitrogen double bond is created by the reductive elimination of water from a hemiaminal, formed by the addition of an amine to a carbonyl molecule, hence the adjective reductive. ...
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).
Hyosung - Quzhou Nitrogen Trifluoride Production Plant - Zhejiang Project Profile Hyosung - Quzhou Nitrogen Trifluoride Production Plant - Zhejiang Project Profile Synopsis Hyosung - Quzhou Nitrogen - Market research report and industry analysis - 11065630
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
Two cobalt compounds, Cp*Co(CO)I2 (1) and CpCo(CO)I2 (2) (Cp* = η5-C5Me5, Cp = η5-C5H5), catalyze the dehydrogenation of ammonia borane under either anaerobic or aerobic conditions and are also effective hydrogenation catalysts for alkenes and alkynes using ammonia borane as a hydrogen source, also in the pr Earth Abundant Element Compounds in Homogeneous Catalysis
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.
Cobalt(II,III) oxide nanopowders are used as supporting materials for rhodium(0) nanoparticles forming Rh-0/Co3O4 nanocatalysts, which can be prepared by impregnation and sodium borohydride reduction of Rh3+ ions on the surface of the oxide support. Magnetically separable Rh-0/Co3O4 nanoparticles are isolated from the reaction medium by an external magnet and characterized using various analytical techniques. Rh-0/Co3O4 nanoparticles are highly active and reusable catalysts with a long lifetime in hydrolytic dehydrogenation of ammonia borane (AB) at room temperature. Rh-0/Co3O4 nanoparticles with 0.5% wt Rh loading provide a turnover frequency of 1800 min(-1) and a total of 1.02 x 10(6) turnovers for H-2 evolution from the hydrolysis of AB at 25.0 +/- 0.1 degrees C. This turnover frequency is the second best value ever reported for the hydrolysis of AB, and the total turnover number of over a million is a record lifetime ever reported. Magnetically separable rhodium(0) nanoparticles are ...
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.. ...
CO and 4 of the CORMs (ALF 153, 157, 436 and CORM-2) increased cGMP levels in smooth muscle cells, while the rest of the compounds failed to alter cGMP production. The CORM-stimulated increase was minor (50-300% over basal) compared to the effects seen with the NO-donor, SNP (at least 100-fold). CORM-3, a widely used CORM, decreased basal cGMP levels in RASMC. Interestingly, CO and CORMs modestly reduced SNP-stimulated cGMP formation in RASMC. The inactive forms of CORMs (compounds lacking the ability to liberate CO) did not affect SNP-induced cGMP accumulation. CORMs also reduced bradykinin-stimulated cGMP levels in endothelial-smooth muscle co-cultures. In sGC activity assays using purified recombinant human sGC, CORMs were ineffective in stimulating cGMP production. However, CORMs blocked up to 80% of DEA-NO-induced sGC activity. ...
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 groups attention has been addressed to research in biomedicine, in materials and energy. All of this research has in common the use of boron clusters, boranes, carboranes or metallacarboranes as key components to find new properties or improve old ones. It was proven that the ratio of thiophene to doping agents in PEDOT polymers can be altered by the cation utilized, thus altering their electrical properties. It was found that with only a single metal, single molecule magnets SMM can be observed. That by judicious choice of the borane as decorating agent different morphologies are found in CdSe dots, so nanorods, nanorings, or tetrapods along with QDs can be generated, resulting in different fluorescent wavelengths. A really fast and high throughput synthetic method has been demonstrated to produce the most promising metallacarborane, which open expectations for large applications. Highly crowded carboranes have been made that pave the way for artificial membranes for ions diffusion. Highly ...
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
2. It is the reason why the structure of methane is highly stable in nature. KNO 3. Moreover, as there exist sigma bonds only and one 2s and three 2p orbitals of the carbon produce four new hybrid orbitals, the hybridization of CH4 is sp3. Lastly, search for the central atom that is usually the single atom in a molecule. VESPR stands for valence shell electron pair repulsion. The lewis structure of carbon and hydrogen atom says- to form a single CH4 molecule, a total of eight valence electrons participate in the shared bonding to fulfill the need of eight more valence electrons. Count the valence electrons in your trial structure … If there is one lone pair of electrons and three bond pairs the resulting molecular geometry is trigonal pyramidal (e.g. BF3 Lewis Structure, Molecular Geometry, and Hybridization Boron Trifluoride (BF3) is an inorganic compound as it lacks a carbon atom or C-H bond in the molecule. As the p shell needs to accommodate a total of six electrons, there is a dearth of ...
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] ...
Hydroboration of alkenes is a classical reaction in organic synthesis in which alkenes react with boranes to give alkylboranes with subsequent oxidation resulting in alcohols. The double bond (π-bond) of alkenes can be readily reacted with boranes owing to its high reactivity. However, the single bond (σ-bond) of alkanes has never been reacted. To pursue the development of σ-bond cleavage, we selected cyclopropanes as model substrates since they present a relatively weak σ-bond. Herein, we describe an iridium-catalyzed hydroboration of cyclopropanes, resulting in β-methyl alkylboronates. These unusually branched boronates can be derivatized by oxidation or cross-coupling chemistry, accessing designer products that are desired by practitioners of natural product synthesis and medicinal chemistry. Furthermore, mechanistic investigations and theoretical studies revealed the enabling role of the catalyst.. ...
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.. ...
You can now access full text articles from research journals published by CSIR-NISCAIR! Full text facility is provided for all nineteen research journals viz. ALIS, AIR, BVAAP, IJBB, IJBT, IJCA, IJCB, IJCT, IJEB, IJEMS, IJFTR, IJMS, IJNPR, IJPAP, IJRSP, IJTK, JIPR, JSIR & JST. NOPR also hosts three Popular Science Magazines viz. Science Reporter (SR), Vigyan Pragati (VP) & Science Ki Duniya (SKD) and a Natural Products Repository (NPARR ...
Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here. Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived. ...
3 is released into the atmosphere.[17][18] Robson projected that the maximum atmospheric concentration is less than 0.16 parts per trillion (ppt) by volume, which will provide less than 0.001 Wm−2 of IR forcing.[19] The mean global tropospheric concentration of NF3 has risen from about 0.02 ppt (parts per trillion, dry air mole fraction) in 1980, to 0.86 ppt in 2011, with a rate of increase of 0.095 ppt yr−1, or about 11% per year, and an interhemispheric gradient that is consistent with emissions occurring overwhelmingly in the Northern Hemisphere, as expected. This rise rate in 2011 corresponds to about 1200 metric tons/y NF3 emissions globally, or about 10% of the NF3 global production estimates. This is a significantly higher percentage than has been estimated by industry, and thus strengthens the case for inventorying NF3 production and for regulating its emissions.[20] One study co-authored by industry representatives suggests that the contribution of the NF3 emissions to the overall ...
It is a yellow liquid. It absorbs water. It reacts when it is placed in water. It can be dissolved in concentrated sulfuric acid. It conducts electricity. It can dissolve other fluorides. ...
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 ...
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 ...
Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
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 ...
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.
1,1 dichloro-1-fluoroethane. These fluorinated solvents will not react with PFPE oils, but the oils will be carried away from the lubricating point. PFPEs are freely soluble in supercritical CO2.. Krytox™ lubricants have also been tested and used in the presence of gaseous, liquid oxygen and chlorine with no reactivity noted.. Krytox™ lubricants are safe for use with rubber, elastomers, plastics, and metals commonly used as seals and bearings.. A type of chemical known as a Lewis acid (electron pair acceptor) can react with PFPE oils and will limit the temperature at which they can be used. Typical Lewis acids are boron trifluoride, aluminum chloride, iron (III) chloride, and titanium tetrachloride. At elevated temperatures, these materials can lead to decomposition of any PFPE.. Caution should be taken with metallic alkalai, such as sodium and lithium metals, as reactions could occur readily.. Some grease grades contain additives for anti-corrosion or extreme pressure, and these additives ...
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 ...
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 ...
Amines and boranes are the archetypical Lewis bases and acids, respectively. The former can readily undergo one-electron oxidation to give radical cations, whereas the latter are easily reduced to afford radical anions. Here, we report the synthesis of a neutral tricoordinate boron derivative, which acts as a Lewis base and undergoes one-electron oxidation into the corresponding radical cation. These compounds can be regarded as the parent borylene (H-B:) and borinylium (H-B+.), respectively, stabilized by two cyclic (alkyl)(amino)carbenes. Ab initio calculations show that the highest occupied molecular orbital of the borane as well as the singly occupied molecular orbital of the radical cation are essentially a pair and a single electron, respectively, in the p(π) orbital of boron. ...
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.
A free platform for explaining your research in plain language, and managing how you communicate around it - so you can understand how best to increase its impact.
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
Preparation of the bioconjugate BD-C225. Cetuximab was generously provided to us by Dr. Daniel Hicklin (ImClone Systems, Inc., New York, NY). Site-specific attachment of a heavily boronated polyamidoamine dendrimer was carried out, as described by us in detail elsewhere (14). Briefly, a fifth generation polyamidoamine dendrimer (Sigma-Aldrich, St. Louis, MO), containing 128 terminal amino groups, was reacted with an isocyanato polyhedral borane anion, Na(CH3)3NB10H8NCO. This yielded a heavily boronated macromolecule, which contained ∼1,100 boron atoms per molecule of dendrimer. Cetuximab was linked to the boronated dendrimer (BD) by two heterobifunctional linkers, N-succinimidyl 3-(2-pyridyldithio)-propionate and N-(k-maleimido undecanoic acid)-hydrazide (14). Protein content of the bioconjugate was determined spectrophotometrically by means of the Coomassie blue assay reagent (Pierce, Rockford, IL) and boron was quantified by means of direct current plasma-atomic emission spectroscopy ...
Carbon monoxide and nitric oxide are two of the most important vasoprotective mediators. Their downregulation observed during vascular dysfunction, which is associated with cancer progression, leads to uncontrolled platelet activation. Therefore, the aim of our studies was to improve vasoprotection and to decrease platelet activation during progression of mouse mammary gland cancer by concurrent use of CO and NO donors (CORM-A1 and DETA/NO, respectively).. Methods: Mice injected intravenously with 4T1-luc2-tdTomato or orthotopically with 4T1 mouse mammary gland cancer cells were treated with CORM-A1 and DETA/NO. Ex vivo aggregation and activation of platelets were assessed in the blood of healthy donors and breast cancer patients. Moreover, we analyzed the compounds direct effect on 4T1 mouse and MDA-MB-231 human breast cancer cells proliferation, adhesion and migration in vitro.. Results: We have observed antimetastatic effect of combination therapy, which was only transient in orthotopic ...
|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)
Betty, China 9,9-Diphenylfluorene-2-boronic acid pinacol ester Suppliers ,offers quality China 9,9-Diphenylfluorene-2-boronic acid pinacol ester.
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.
1-Cyclopentyl-1H-pyrazole-4-boronic acid pinacol ester, 97%, Acros Organics 1g 1-Cyclopentyl-1H-pyrazole-4-boronic acid pinacol ester, 97%, Acros Organics Boronic...
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. ...
see article for more reactions. Abstract. A conjugated bis-guanidinate (CBG)-supported aluminum dihydride complex catalyzes a chemoselective hydroboration of various nitriles and alkynes. The reaction leaves other reducible groups intact. Moreover, aluminum-catalyzed hydroboration is expanded to more challenging substrates such as alkene, pyridine, imine, carbodiimide, and isocyanides.. ...
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 dioxide [无化] 二氧化氮 ; 四氧化二氮 ; 可采用二氧偶氮 ; 二氧化氮化学品 nitrogen fixation [化学] [生物] 固氮作用 ; [化学] 固氮 ; 氮固定 nitrogen oxide 氮氧化物 ; 一氧化二氮 ; 氮的氧化物 nitrogen cycle [土壤] 氮循环 ; 氮素循环 ; 氮化合物循环 ; 氮轮回 nitrogen trifluoride 翻译 nitrogen triiodide 三碘化氮 Nitrogen trichloride 氯化氮 ; 翻译 nitrogen pentoxide [无化] 五氧化二氮 ; 硝酸酐 nitrogen laser [激光] 氮激光器 ; 氮气雷射 ; 氮分子激光器 ; 氮分子激光 ...
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.. ...
chemBlink provides information about CAS # 874959-74-7, 5-Methylthiophene-3-boronic acid pinacol ester, 4,4,5,5-Tetramethyl-2-(5-methyl-3-thienyl)-1,3,2-dioxaborolane, 4,4,5,5-Tetramethyl-2-(5-methylthiophen-3-yl)-1,3,2-dioxaborolane, molecular formula: C11H17BO2S.
Buy 4-Cyanopyridine-3-boronic acid pinacol ester (CAS 878194-91-3), a product for proteomics research, from Santa Cruz. MF: C12H15BN2O2, MW: 230.07
Buy 1-(Phenylsulfonyl)indole-3-boronic acid pinacol ester (CAS 870717-93-4), a product for proteomics research, from Santa Cruz. MF: C20H22BNO4S
[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...
Lookchem Provide Cas No.1309982-64-6 Basic information: Properties,Safety Data,Sds and Other Datebase. We also Provide Trading Suppliers & Manufacture for 1309982-64-6 2-CHLORO-6-METHYLPYRIDINE-3-BORONIC ACID PINACOL ESTER.
Lisätietoa aiheesta 1H-Pyrazole-3-boronic acid pinacol ester. Me mahdollistamme tieteen tekemisen tarjoamalla käyttöösi kattavan tuotevalikoiman, hyvän palvelun, toimivat prosessit ja osaavat ihmisemme.
Highly Enantioselective Catalytic Allylboration of Ketiminoesters: Practical and Scalable Synthesis of α-Fully-Substituted Amino Esters
Alfa Aesar is a leading manufacturer and supplier of research chemicals, pure metals and materials for a wide span of applications.
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 ...
In order to prevent hydroboration across both the pi-bonds, a bulky borane like disiamyl (di-sec-iso-amyl) borane is used. Use ... 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 ...
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& ...
Brown, H. C. (1975). Organic Syntheses via Boranes. New York: John Wiley & Sons. ISBN 0-471-11280-1. Palladium hydride Züttel, ... 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 ...
Borane adducts with phosphines and amines are also available, but are not widely used. Borane makes a strong adduct with ... This significant rate difference in producing di- and tri-alkyl boranes is useful in the synthesis of bulky boranes that can ... See Borane-dimethylsulfide complex Zaidlewicz, Marek; Baum, Ofir; Srebnik, Morris. "Borane Dimethyl Sulfide". Encyclopedia of ... More sterically hindered tertiary and silyl amines can deliver borane to alkenes at room temperature. Monoalkyl boranes are ...
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 ...
The Boranes and Their Relatives. in Les Prix Nobel en 1976. Imprimerie Royal PA Norstedt & Soner, Stockholm. 110-131.[1][2] ... The 1976 Nobel Prize in Chemistry was awarded to Lipscomb "for his studies on the structure of boranes illuminating problems of ... The diagram at right shows a typical nuclear magnetic resonance (NMR) spectrum of a borane molecule. Lipscomb investigated ... Lipscomb and his graduate students further determined the molecular structure of boranes (compounds of boron and hydrogen) ...
... 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. CS1 maint: discouraged parameter (link). ...
Miller, H. C.; Muetterties, E. L.; Boone, J. L.; Garrett, P.; Hawthorne, M. F. (2007). "Borane Anions". Inorganic Syntheses. pp ...
Fullerene chemistry Carborane Boranes Hirsch, Andreas; Chen, Zhongfang; Jiao, Haijun (2000), "Spherical Aromaticity in Ih ... Spherical Aromaticity: Recent Work on Fullerenes, Polyhedral Boranes, and Related Structures. ... polyhedral boranes. In 2000, Andreas Hirsch and coworkers in Erlangen, Germany, formulated a rule to determine when a fullerene ...
Muetterties's work on boron hydride clusters led to the work on several polyhedral borane anions such as B12H122−. He was an ... In addition to the polyhedral boranes, the program explored pi-allyl, fluoroalkyl, and boron hydride complexes of the ... Journal of the American Chemical Society (1957), 79 3686-7. Hawthorne, M. Frederick (March 23, 2009). "Polyhedral Boranes: ... who is known for his experimental work with boranes, homogeneous catalysis, heterogeneous catalysis, fluxional processes in ...
Atkins, Jr., William J.; Burkhardt, Elizabeth R.; Matos, Karl (2006). "Safe Handling of Boranes at Scale". Org. Process Res. ...
... is the borane with the formula (CH3)4C2O2BH. It features a five-membered C2O2B ring. Owing to the presence of the ... Brown, H.C.; Zaidlewicz, M. (2001). Organic Syntheses Via Boranes, Vol. 2. Milwaukee, WI: Aldrich Chemical Co. ISBN 978-0- ...
Borane dimerizes irreversibly. Gallane and heavier congeners polymerize, sometimes with loss of hydrogen. Plumbane and ...
"Callery Borane Products , Callery.com , Callery". Callery. 2017-03-05. Retrieved 2017-03-05. Binger, P.; Köster, R., "Sodium ...
... 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 ...
... the hydrides of boron are boranes B2H6. The final "-e" is dropped before a suffix that starts with a vowel, e.g. "propanol". ...
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 ...
More generally, nearly all carboranes, boranes, and other known and characterized polyboron clusters are similarly electron- ... Lipscomb, William N. (11 December 1976). "The Boranes and their relatives (Nobel lecture)" (PDF). nobelprize.org. Nobel ...
NHCs and boranes form stable NHC borane adducts. Triethylborane adducts can be synthesised directly from the imidazolium salt ... Hydroboration of alkenes or alkynes is an efficient method for the generation of boranes; however, the use of borane (BH3) or ... Hydroboration of alkenes or alkynes with borane (BH3) or borane equivalents leads to the conversion of only 33% of the starting ... Two of the three alkyl groups attached to the borane may be converted to halide in the presence of excess base, but the use of ...
The Synthesis of Tetrafluorodiphosphine Borane". Journal of the American Chemical Society. 89 (1): 172-173. doi:10.1021/ ...
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 ...
doi:10.15227/orgsyn.053.0052.CS1 maint: uses authors parameter (link) Michael W. Rathke, Alan A. Millard (1978). "Boranes in ...
This includes a broad work of B-N containing compounds such as ammonia-borane (H3NBH3) as an ideal hydrogen fuel carrier, as ... Stephens, Frances H.; Pons, Vincent; Tom Baker, R. (2007). "Ammonia-borane: the hydrogen source par excellence?". Dalton Trans ... amine-borane". Chem. Sci. 6 (1): 618-624. doi:10.1039/C4SC02710H. PMC 5491959. PMID 28706630. Hanson, Susan K.; Baker, R. Tom ( ... Borane for Chemical Hydrogen Storage". Journal of the American Chemical Society. 129 (7): 1844-1845. doi:10.1021/ja066860i. ...
One such process that Goldberg has helped develop is the dehydrogenation of ammonia borane using an iridium pincer catalyst, a ... "Efficient Catalysis of Ammonia Borane Dehydrogenation". Journal of the American Chemical Society. 128 (37): 12048-12049. doi: ...
Borane tert-butylamine complex Eller, Karsten; Henkes, Erhard; Rossbacher, Roland; Höke, Hartmut (2000). "Amines, Aliphatic". ...
Alpine-borane is produced by hydroborating α-pinene with 9-borabicyclononane. Both of these reagents can be improved upon by ... The chloride is reported to be more stable that the trialkyl boranes, it works well with aryl alkyl ketones and tert-butyl ... 1978). "Boranes in functionalization of olefins to amines: 3-Pinanamine". Organic Syntheses. 58: 32.; Collective Volume, 6, p. ... The compound was reported in 1961 by Zweifel and Brown in a pioneering demonstration of asymmetric synthesis using boranes. The ...
doi:10.1016/S0040-4039(00)73934-7. Conley, Brian L.; Williams, Travis J. (2010). "Dehydrogenation of ammonia-borane by Shvo's ...
... sometimes called boranes. The simplest borane is diborane, or B2H6. Another example is B10H14. The next group-13 elements, ...
"A Unifying Electron-Counting Rule for Macropolyhedral Boranes, Metallaboranes, and Metallocenes". J. Am. Chem. Soc. 123 (18): ...
R-Alpine-Borane and S-Alpine-Borane at Sigma-Aldrich M. M. Midland (1989). "Asymmetric reductions with organoborane reagents". ... Alpine borane is the commercial name for an organoboron compound that is used in organic synthesis. It is a colorless liquid, ... A range of alkyl-substituted borane are specialty reagents in organic synthesis. Two such reagents that are closely related to ... sterically crowded chiral trialkylborane can stereoselectively reduce aldehydes in what is known as the Midland Alpine Borane ...
Ammonia borane Borane dimethylsulfide Borane tert-butylamine Marek Zaidlewicz, Herbert C. Brown, Santhosh F. Neelamkavil, " ... Borane-tetrahydrofuran is a dipolar bond charge-transfer complex composed of borane and tetrahydrofuran (THF). These solutions ... The following organoboron reagents are prepared from borane-THF: 9-borabicyclo[3.3.1]nonane, Alpine borane, ... It is also used as a source of borane (BH3) for the formation of adducts. The solution is highly sensitive to air, requiring ...
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/ ...
Borane(5)Edit. Borane(5) is the dihydrogen complex of borane. Its molecular formula is BH5 or possibly BH3(η2-H2).[12] It is ... For the class of compounds, see boranes.. Trihydridoboron, also known as borane or borine, is an unstable and highly reactive ... Borane dimethylsulfide which is more stable than borane-tetrahydrofuran may also be used.[11][10] ... The preparation of borane carbonyl, BH3(CO), played an important role in exploring the chemistry of boranes, as it indicated ...
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. ...
Tris(pentafluorophenyl)borane, sometimes referred to as "BCF", is the chemical compound (C6F5)3B. It is a white, volatile solid ... Tris(pentafluorophenyl)borane is also capable of abstracting hydride to give [(C6F5)3BH]−, and it catalyzes hydrosilylation of ... Tris(pentafluorophenyl)borane is prepared using a Grignard reagent derived from bromopentafluorobenzene: 3 C6F5MgBr + BCl3 → (C ... Tris(pentafluorophenyl)borane is a key reagent leading to the concept of frustrated Lewis pairs. The combination of BCF and ...
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. ...
The use of borane-pyridine as a reducing agent for the reductive amination of aldehydes and ketones with primary aromatic and ... Results were encouraging, suggesting that borane-pyridine in acidic media could be developed into a useful practical reagent ... The hydroboration of alkenes with borane complexed to hindered tertiary amines was studied. Complexes capable of hydroboration ... The successful hydroboration of simple alkenes with borane-triphenylphospbite was achieved in refluxing ethereall solvents in ...
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, ...
Our boranes include dimethyl sulfide borane, more... EMAIL INQUIRY to 1 to 30 of 32 Borane-Dimethylamine Complex (CAS No. 74-94 ... Synonyms: (Dimethylamino)borane, Dimethylamine borane, DMAB, Borane-dimethylamine complex, WLN: 1M1 &BHHH, NSC53321, EINECS 217 ... with BORANE (1:1), Boron, trihydro(N-methylmethanamine)-, (T-4)-, 1838-13-7 Molecular Formula: C2H6BN. Molecular Weight: ... Borane-Dimethylamine Complex (CAS No. 74-94-2) Suppliers. Limit companies to: Worldwide USA China India ...
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 ...
  • Lewis Acid Properties of Tris(pentafluorophenyl)borane. (wikipedia.org)
  • Tris(pentafluorophenyl)borane , sometimes referred to as "BCF", is the chemical compound (C 6 F 5 ) 3 B. It is a white, volatile solid. (wikipedia.org)
  • Tris(pentafluorophenyl)borane is thermally stable at temperatures wide over 200 °C, resistant to oxygen and water-tolerant. (wikipedia.org)
  • The structure of tris(pentafluorophenyl)borane (BCF) was determined by gas electron diffraction. (wikipedia.org)
  • Compared with a torsional angle of 56.8(4)° for tris(perfluoro-para-tolyl)borane (BTolF), which is a stronger Lewis acid than BCF, this shows that there is some delocalization of electron density from the para-fluorine atoms to the boron atom that reduces its acidity. (wikipedia.org)
  • Tris(pentafluorophenyl)borane is also capable of abstracting hydride to give [(C 6 F 5 ) 3 BH] − , and it catalyzes hydrosilylation of aldehydes. (wikipedia.org)
  • Tris(dimethylamino)borane undergoes facile transamination reactions with primary and secondary amines to give higher homologs of tris(alkylamino)boranes. (paperplane.io)
  • Tris(dialkylamino)boranes react readily with carboxylic acids to give amides. (paperplane.io)
  • 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. (ucsd.edu)
  • This sterically crowded chiral trialkylborane can stereoselectively reduce aldehydes in what is known as the Midland Alpine Borane Reduction, or simply the Midland Reduction: C8H12B-pinanyl + RCDO → C8H12BOCHDR + (+)-d-pinene Hydrolysis of the resulting borinic ester affords the alcohol: C8H12BOCHDR + H2O → C8H12BOH + HOCHDR It is also effective for the stereoselective reduction of certain acetylenic ketones. (wikipedia.org)
  • The catalytic test indicated that the Ru NPs supported MIL-101 material exhibited exceedingly high activity and excellent durability for hydrogen generation from the catalytic hydrolysis of amine boranes. (hindawi.com)
  • Herein, we report the preparation and characterization of rhodium(0) nanoparticles supported on hydroxyapatite (Ca-10(OH)(2)(PO4)(6), HAP) and their catalytic use in the hydrolysis of hydrazine-borane, which attracts recent attention as promising hydrogen storage materials. (yyu.edu.tr)
  • Hydroxyapatite supported rhodium(0) nanoparticles were readily prepared by the hydrazine-borane reduction of rhodium(III)-exchanged hydroxyapatite in situ during the hydrolysis of hydrazine-borane at room temperature. (yyu.edu.tr)
  • The catalytic performance of these new supported rhodium(0) nanopaiticles in terms of activity, lifetime and reusability was tested in the hydrolysis of hydrazine-borane. (yyu.edu.tr)
  • This report also includes the detailed kinetic study of the hydrolysis of hydrazine-borane catalyzed by hydroxyapatite supported rhodium(0) nanoparticles depending on the catalyst concentration, substrate concentration, and temperature. (yyu.edu.tr)
  • abstract = "Magnesium borohydride ammonia borane, Mg(BH4)2(NH3BH3)2, was electrochemically investigated. (elsevier.com)
  • abstract = "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)
  • Alpine borane is the commercial name for an organoboron compound that is used in organic synthesis. (wikipedia.org)
  • A range of alkyl-substituted borane are specialty reagents in organic synthesis. (wikipedia.org)
  • S -Alpine-Borane ® may be used in the preparation of (-)-(4 S )-5-methyl-2-hexyn-4-ol, an intermediate for the synthesis of (+)-Prelog-Djerassi lactonic aldehyde. (sigmaaldrich.com)
  • Dicyclohexylphosphino) borane is a precursor in the synthesis of water-soluble phosphines. (caltech.edu)
  • The development of a new method of synthesizing a liquid N-heterocyclic carbene (NHC) borane reagent is described, and a survey of reactivity is completed to demonstrate its effectiveness as a reagent in organic synthesis. (pitt.edu)
  • Synthesis of mixed sequence borane phosphonate DNA. (colorado.edu)
  • A novel solid-phase phosphoramidite-based method has been developed for the synthesis of borane phosphonate DNA. (colorado.edu)
  • Results were encouraging, suggesting that borane-pyridine in acidic media could be developed into a useful practical reagent for this reaction. (bl.uk)
  • Borane-tetrahydrofuran complex is an important reagent used in the reduction of certain functional groups viz. (fishersci.ca)
  • It is usually prepared by combining borane-ether complexes and CO. The compound is mainly of theoretical and pedagogical interest. (wikipedia.org)
  • The structural, electronic, and thermodynamic properties of ammonia-borane complexes with varying amounts of hydrogen have been characterized by first principles calculations within density functional theory. (ebscohost.com)
  • Metal-borane complexes are emerging as promising systems for study in the context of bifunctional catalysis. (caltech.edu)
  • Amine-boranes are stable borane complexes, but very few are used for hydroboration. (prf.org)
  • The PS- and PSP-ligands in the complexes below are borane-free analogues of our borane-containing TXPB ligand. (mcmaster.ca)
  • First Atropo-Enantioselective Ring Opening of Achiral Biaryls Containing Lactone Bridges with Chiral Hydride-Transfer Reagents Derived from Borane. (docme.ru)
  • 3 1 3 , 14] A 2 R = CH3 First Atropo-Enantioselective Ring Opening of Achiral Biaryls Containing Lactone Bridges with Chiral Hydride-Transfer Reagents Derived from Borane** By Gerhard Bringmann* and Thomas Hurtung Dedicuted to Professor Gerhurd Quinkert on the occasion of his 65th birthday Rotationally restricted biaryl compounds from natural and synthetic sources have attracted ever more attention because of their biological activity but also as chiral auxiliaries. (docme.ru)
  • 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)
  • 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)
  • Hydrogen released from chemical hydride ammonia borane (AB, NH 3 BH 3 ) can be greatly improved when AB is confined in metal-organic frameworks (MOFs), showing reduced decomposition temperature and suppressed unwanted byproducts. (elsevier.com)
  • Borane ammoniate, which is produced by a displacement reaction of other borane adducts, eliminates elemental hydrogen on heating to give borazine (HBNH) 3 . (wikipedia.org)
  • This reaction is regioselective , Other borane derivatives can be used to give even higher regioselectivity. (wikipedia.org)
  • Reaction of 2-aminomethylpyridine with diphenylborinic acid in a mixture of CHCl3-diethyl ether gives diphenyl-(2-aminomethylpyridine-N,N)borane, a cyclic adduct that in presence of environmental moisture yields the N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane. (edu.mx)
  • NHC-boryl oxalates are formed via direct reaction of NHC-boranes and oxalic acid in acetonitrile. (pitt.edu)
  • We showed that other organic diacids were unable to produce isolable products upon reaction with NHC-boranes, with the exception of phthalic acid, which produced an NHC-boryl phthalate product. (pitt.edu)
  • In Chapter 3, the reaction of NHC-boranes with dibenzoyl peroxide (DBP) and radical initiators is studied. (pitt.edu)
  • We found that the inclusion of a radical initiator such as azobisisobutyronitrile (AIBN) or di-tert-butyl hyponitrite (TBHN) increases the rate of the benzoyloxylation reaction, and the use of TBHN results in di-benzoyloxylated NHC-borane products. (pitt.edu)
  • On the basis of chiral binaphthyl diene-derived frustrated Lewis pairs (FLPs) developed by our group, in this work, we designed and synthesized a novel class of chiral spiro dienes, which could further react with Piers' borane via the hydroboration reaction to generate chiral boranes in situ . (sioc-journal.cn)
  • Firstly, I note that the reaction is normally done with "stabilized" borane, via pre-coordination to thf. (imperial.ac.uk)
  • Alfa Aesar™ Borane-tetrahydrofuran complex, 1M soln. (fishersci.ca)
  • S -Alpine-Borane ® is a chiral reducing agent, synthesized from (-)-α-pinene via hydroboration. (sigmaaldrich.com)
  • The authors cover practical features of stability, reactivity, and workup, as well as such aspects of allylboration as the stereochemical control elements, including relative diastereoselection with crotylboranes, induced (internal) diastereoselection with chiral carbonyl compounds, auxiliary-controlled enantio-selective allylations with chiral borane reagents, and recent advances in catalysis of allylboration. (thefreedictionary.com)
  • 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)
  • Herein, we show that derivatives of another alkaloid, (-)-cytisine, are useful surrogates for (+)-sparteine in the desymmetrization of prochiral phenyl-, cyclohexyl- and tert-butyl dimethyl phosphine boranes, yielding chiral phosphine boranes in up to 92% ee. (chalmers.se)
  • Unfortunately, the bulk ammonia borane may release hydrogen too slowly for use as a hydrogen storage media for an automobile. (pnnl.gov)
  • Two such reagents that are closely related to Alpine borane are 9-BBN and diisopinocampheylborane. (wikipedia.org)
  • For the class of compounds, see boranes . (wikipedia.org)
  • Borane compounds which are hydrogen storage materials are hypergolic with white fuming nitric acid as oxidizer. (rsc.org)
  • The nature of borane bonds is very distinctive: they are electron-deficient compounds-that is, they do not have a sufficient number of electrons to bind all the atoms by means of the usual two-electron valent bonds. (thefreedictionary.com)
  • The addition compounds of some phosphines with boron trifluoride, borane , and trimethylboron. (thefreedictionary.com)
  • When dissolved in ionic liquids , the borane solutions exhibit ignition delay times which are superior to any known hypergolic ionic liquids . (rsc.org)
  • These borane - ionic liquid solutions appear to be the brightest hope so far to replace hydrazine and its derivatives as fuels in hypergolic propellant systems. (rsc.org)
  • In addition, new radical and ionic reactions to prepare novel substituted NHC-boranes are studied. (pitt.edu)
  • NHC-boranes and benzoyl peroxide are generally not mutually stable, and the addition of DBP to an NHC-borane causes ionic benzoyloxylation, forming NHC-boryl benzoate products. (pitt.edu)
  • The hydroboration of alkenes with borane complexed to hindered tertiary amines was studied. (bl.uk)
  • Researchers at Purdue University have developed a method for achieving hydroboration of alkenes using ammonia borane. (prf.org)
  • The most prominent FLPs are based on intramolecular phosphane-borane adducts, whose catalytic properties can be tailored over wide ranges of reactivity and selectivity. (biomedsearch.com)
  • 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)
  • Sterically encumbered (perfluoroaryl) borane and aluminate cocatalysts for tuning cation - Anion ion pair structure and reactivity in metallocene polymerization processes. (northwestern.edu)
  • Borane carbonyl is the inorganic compound with the formula H3BCO. (wikipedia.org)
  • 3 . The preparation of borane carbonyl , BH 3 (CO), played an important role in exploring the chemistry of boranes, as it indicated the likely existence of the borane molecule. (wikipedia.org)
  • This Thesis describes the investigations of iron-catalysed dehydrocoupling/dehydrogenation of various amine- and phosphine-borane adducts. (bl.uk)
  • These were then employed as dehydrocoupling catalysts for a variety of phosphine-borane adducts. (bl.uk)
  • Studies of analogous chemistry led to the discovery of metal-free hydrogenation of the B=N bond in the "model" aminoborane iPr(2)N=BH2 to give iPr(2)NH center dot BH3 upon treatment with the diborazane Me3N-BH2-NHMe-BH3 or amine-boranes RR'NH center dot BH3 (R, R' = H or Me). (bris.ac.uk)
  • Robertson, APM, Leitao, EM & Manners, I 2011, ' Catalytic Redistribution and Polymerization of Diborazanes: Unexpected Observation of Metal-Free Hydrogen Transfer between Aminoboranes and Amine-Boranes ', Journal of the American Chemical Society , vol. 133, no. 48, pp. 19322-19325. (bris.ac.uk)
  • Borane(5) is the dihydrogen complex of borane. (wikipedia.org)
  • The structure of other boranes is still more complex. (thefreedictionary.com)
  • In contrast to hydrocarbons, boranes form complex spatial structures rather than chains of atoms. (thefreedictionary.com)
  • Perhaps instead it is less classical than this, being closer to a non-classical bridged species involving an asymmetric π-complex between the borane and the alkene. (imperial.ac.uk)
  • Nick: Well, without prior coordination, the "pre-complex" of borane + alkene lies in an extremely shallow minimum ( it can be tricky to find it ) and the barrier out of this minimum is very small. (imperial.ac.uk)
  • R-Alpine-Borane and S-Alpine-Borane at Sigma-Aldrich M. M. Midland (1989). (wikipedia.org)
  • R -Alpine borane is effective at reducing acetylenic ketones to secondary alcohols with reasonable enantioselectivity. (chemtube3d.com)
  • Further steps give rise to successively higher boranes, with B 10 H 14 as the most stable end product contaminated with polymeric materials, and a little B 20 H 26 . (wikipedia.org)
  • the higher boranes (BioHn-decabo-rane, and others) are solids. (thefreedictionary.com)
  • The higher boranes are more stable and less reactive. (thefreedictionary.com)
  • The higher boranes are produced through the thermal decomposition of diborane. (thefreedictionary.com)
  • The selected boranes are ammonia borane NH 3 BH 3 (AB), hydrazine borane N 2 H 4 BH 3 (HB), hydrazine bis borane N 2 H 4 (BH 3 ) 2 (HBB), lithium LiN 2 H 3 BH 3 (LiHB) and sodium NaN 2 H 3 BH 3 (NaHB) hydrazinidoboranes, and sodium triborane NaB 3 H 8 (STB). (mdpi.com)
  • Although they were shown to be poor catalysts for the dehydrocoupling of secondary phosphine-boranes, increased catalytic activity was observed in the analogous reactions with primary phosphine-boranes. (bl.uk)
  • P-chirogenic phosphine ligands can be prepared via desymmetrization of prochiral phosphine boranes using s-BuLi. (chalmers.se)
  • Certain borane derivatives can be used to obtain heat-resistant polymers. (thefreedictionary.com)
  • Other boranes and certain of their derivatives are extremely toxic. (thefreedictionary.com)
  • however, there is a need for a review dedicated to the redox and photophysical characteristics of easily accessible borane and carborane derivatives, which are excellent materials for a wide range of applications. (icmab.es)
  • Indeed, reactions of NHC-boranes with carboxylic acids and radical initiators gave NHC-boryl carboxylate products. (pitt.edu)
  • in tetrahydrofuran a stabilising agent is added to prevent the THF from oxidising the borane. (wikipedia.org)
  • Borane dimethylsulfide which is more stable than borane-tetrahydrofuran may also be used. (wikipedia.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 refluxing ethereal solvents, in the presence of methyliodide, strongly complexed borane-amines hydroborated alkenes completely. (bl.uk)
  • The successful hydroboration of simple alkenes with borane-triphenylphospbite was achieved in refluxing ethereall solvents in the presence of methyl iodide or benryliodide, or in the presence of sulphur. (bl.uk)
  • 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)
  • It acts as a borane source for oxazaborolidine catalyzed asymmetric reductions. (fishersci.ca)
  • All boranes decompose to boron and hydrogen at temperatures greater than 700° C. (thefreedictionary.com)
  • After examining possible mechanisms for this transformation, we hypothesized that NHC-boranes can react with benzoic acid when a radical initiator is included. (pitt.edu)
  • Boranes containing two to 20 atoms of boron per molecule are known. (thefreedictionary.com)
  • Ammonia borane releases a hydrogen molecule, forming polyaminoborane. (pnnl.gov)
  • One molecule of dba (dibenzylideneacetone) is bound between palladium and the borane of the TXPB ligand. (mcmaster.ca)
  • With respect to LiHB, NaHB and STB, the differences are explained by a stabilization effect favored by the alkali cations via M···H interactions with four to five borane anions. (mdpi.com)
  • A team of PNNL researchers have been evaluating ammonia borane, the inorganic analog of ethane, as a potential hydrogen storage material. (pnnl.gov)
  • 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)
  • 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)
  • Herein we report the first Ni(II)‐catalysed transfer hydrogenation of quinolines using ammonia borane (AB) as hydrogen (H2) source. (nwu.ac.za)
  • 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)
  • The structure of N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane was confirmed by X-ray diffraction. (edu.mx)
  • The use of borane-pyridine as a reducing agent for the reductive amination of aldehydes and ketones with primary aromatic and aliphatic amines was studied. (bl.uk)
  • The resulting cationic zirconocene species is stabilised by the non coordinating borane anion. (wikipedia.org)
  • Toxicity of borane fuels. (cdc.gov)
  • Nanoscale hexagonal BN additive for ammonia borane, AB, is shown to decrease the onset temperature for hydrogen release. (elsevier.com)