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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 ...
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This page contains information on the chemical Boron trifluoride acetic acid complex, liquid including: 1 synonyms/identifiers; U.S. Code of Federal Regulations Title 49 Section 172 shipping regulations and proper shipping name; USDOT 2008 Emergency Response Guidebook initial response information.
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TY - GEN. T1 - Mechanistic studies of hydrogen release from solid amine borane materials. AU - Bowden, Mark. AU - Kemmitt, Tim. AU - Shaw, Wendy. AU - Hess, Nancy. AU - Linehan, John. AU - Gutowski, Maciej. AU - Schmid, Benjamin. AU - Autrey, Tom. PY - 2006/12/1. Y1 - 2006/12/1. N2 - Ammonia borane (NH3BH3) is a molecular solid with a high volumetric and gravimetric density of hydrogen. We report room temperature structural data which shows how the freely rotating NH3 and BH 3 groups allow a N-H...H-B dihydrogen bond in which hydrogen atoms on adjacent molecules are separated by only 1.90Å. The initial decomposition of ammonia borane at 80-100°C into (NH2BH2) n and H2 has been studied by in-situ nmr spectroscopy and kinetic studies using isotopic substitution. The reaction proceeds by a bimolecular pathway involving a [NH3BH2NH 3]+BH4- intermediate with an activation energy of 136kJmol-1.. AB - Ammonia borane (NH3BH3) is a molecular solid with a high volumetric and gravimetric density of ...
Bismuth trifluoride was prepared as a precipitate from the addition of potassium trifluoride to a solution of bismuth nitrate dissolved in nitric acid. Infrared spectra of Nujol mulls and cesium bromide pellets containing bismuth trifluoride gave only two of the four absorption bands expected. One band was at 523 and the other a broad band at 258 wave numbers. The production of sufficient quantities of bismuth hydride Bismuthine for infrared study was attempted by two methods. The method used by Paneth in 1919 involved preparing a magnesium-bismuth alloy. The alloy was treated with acid bismuth hydride was reported as one of the gaseous products evolved. The second method of production was proposed by Schaeffer in 1954. Lithium borohydride in aqueous solution was added to a solution of bismuth trichloride dissolved in hydrochloric acid. The lithium borohydride used in the attempted production of bismuth hydride by the Schaeffer method was obtained commercially and contained chlorine as an impurity. The
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
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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.
According to a new report by EMR titled, Global Nitrogen Trifluoride (NF3) Market Report and Forecast 2021-2026, the global NF3 market is projected to grow at a CAGR of 6.2% between 2021 and 2026.
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.. ...
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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. ...
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This is unique source of information on the chemicals manufactured and imported in Europe. It covers their hazardous properties, classification and labelling, and information on how to use them safely.. REACH. ...
The previously known anion [(C6F5)(3)B(mu-OH)B(C6F5)(3)](-) (2) has been prepared by a two-step procedure, involving deprotonation of (C6F5)(3)BOH2 to give [B(C6F5)(3)OH](-) (1), followed by addition of B(C6F5)(3). The solution structure and the dynamics of 2 have been investigated by H-1 and F-19 NMR spectroscopy. The reaction of [NHEt3]2 with NEt3 resulted in the formation of [NHEt3](+)[(C6F5)(3)BOH](-), [NHEt3](+)(C6F5)(3)[BH](-), and (C6F5)(3)B-(CH2CH=N+Et2). This indicates that in the presence of a nucleophile anion 2 can dissociate to B(C6F5)(3) and 1. The reaction of [HDMAN]2 with 1,8-bis(dimethylamino) naphthalene (DMAN) confirmed this trend. In the presence of water, 2 transformed into the adduct [(C6F5)(3)BO(H)(HO)-O-...(H)B(C6F5)(3)](-) (3), containing the borate 1 hydrogen-bonded to a water molecule coordinated to B(C6F5)(3). The same compound is formed by treating (C6F5)(3)BOH2 with 0.5 equiv of a base. A competition study established that for 1 the Lewis acid-base interaction with ...
Chemists in the US have developed a simple reaction to make ammonia borane - a powder more hydrogen-dense than even liquid hydrogen. Their one-pot synthesis of this promising hydrogen storage material is reported in the first issue of the new Royal Society of Chemistry journal Energy & Environmental Science.. Hydrogen has significant benefits as a fuel of the future: potentially renewable and sustainable, and, as hydrogen fuel cells emit only water, a green alternative to other more polluting fuels.. Storing hydrogen safely is tricky, however - pressurising hydrogen gas is clearly dangerous for everyday use, and it can only be stored as a liquid under cryogenic conditions.. Chemists like Tom Autrey from Pacific Northwest National Laboratory, US, are addressing the problem by designing materials to store hydrogen safely, such that it can be released at will to power a fuel cell.. Ammonia borane (AB) is a stable white powder which releases hydrogen gas upon heating. Its use as a hydrogen storage ...
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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. ...
Herein we report unprecedented manganese-catalyzed semihydrogenation of internal alkynes to (Z)-alkenes using ammonia borane as a hydrogen donor. The reaction is catalyzed by a pincer complex of the earth-abundant manganese(II) salt in the absence of any additives, base, or superhydride. The ammonia borane smoothly reduces the manganese precatalyst [Mn(II)-PNP][Cl]2 to the catalytically active species [Mn(I)-PNP]-hydride in the triplet spin state. This manganese hydride is highly stabilized by complexation with the alkyne substrate. Computational density functional theory (DFT) analysis studies of the reaction mechanism rationalize the origin of stereoselectivity toward formation of (Z)-alkenes ...
p - (q -Cyclopentadienyl)-p-[1-37-(2-methylallyl)] bis (triphenylphosphanepalladium) ( 2 a ) Triphenylphosphane (141 mg, 0.54mmol) in toluene (5 ml) was added to a solution of C&17PdC5H5 (122mg, 0.54mmol) in toluene (10ml) under nitrogen. The mixture was stirred for 3 h at room temperature, the color changing from deep red to orange. After removal of half the solvent and addition of pentane (10ml) the mixture was kept at -30°C for 24h. Orange-yellow crystals were formed; they were filtered, washed with pentane and dried in .high vacuum. Yield 85 %. Received: September 30, 1974 [Z 151 IE] German version: Angew. Chem. 87,205 (1975) [ l ] Part 17 of the series: Studies of the Reactivity of Metal x-Complexes. This work was supported by the Schweizerischer Nationa1fonds.-Part 16: Ref. [ 121. Structural investigation^[^] on the complexes (2) and (3) show a great similarity of the sulfur oxide difluoride imide group with the isoelectronic thiazyl trifluoridel4I. It was already known that NSF3 can ...
BrF3 is the chemical formula for bromine trifluoride. Bromine trifluoride is a hazardous liquid chemical compound that is created when a single bromine atom bonds with three atoms of...
Novel telechelic olefin and hydroxy polymers particularly those of polyisobutylene are prepared according to the process set forth herein. Preparation of a telechelic diolefin polyisobutylene includes the steps of refluxing a solution of telechelic dihalogen polyisobutylene, adding a solution of a strong base such as potassium t-butoxide and stirring to form the telechelic diolefin polyisobutylene. This telechelic diolefin can be converted to the telechelic dihydroxy by refluxing a solution of the former, hydroborating the diolefin to a polymeric borane and oxidizing the polymeric borane to form the telechelic dihydroxy polyisobutylene. The processes are also applicable to the conversion of trihalogenated polyisobutylenes to telechelic triolefin and trihydroxy polyisobutylene tristars.
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Background Carbon monoxide (CO) synthesized by heme oxygenase 1 (HO-1) exerts antinociceptive effects during inflammation but its role during neuropathic pain remains unknown. Our objective is to investigate the exact contribution of CO derived from HO-1 in the modulation of neuropathic pain and the mechanisms implicated. Methodology/Principal Findings We evaluated the antiallodynic and antihyperalgesic effects of CO following sciatic nerve injury in wild type (WT) or inducible nitric oxide synthase knockout (NOS2-KO) mice using two carbon monoxide-releasing molecules (CORM-2 and CORM-3) and an HO-1 inducer (cobalt protoporphyrin IX, CoPP) daily administered from days 10 to 20 after injury. The effects of CORM-2 and CoPP on the expression of HO-1, heme oxygenase 2 (HO-2), neuronal nitric oxide synthase (NOS1) and NOS2 as well as a microglial marker (CD11b/c) were also assessed at day 20 after surgery in WT and NOS2-KO mice. In WT mice, the main neuropathic pain symptoms induced by nerve injury were
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|
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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 ...
Zhong-Qiang Jia, Yi-Chi Zhang, Qiu-Tang Huang, et al. Acute toxicity, bioconcentration, elimination, action mode and detoxification metabolism of broflanilide in zebrafish, Danio rerio. Journal of Hazardous Materials. 2020, Vol.394, p.122521.. Chunyan Luo, Qiong Xu, Chaoqun Huang, et al. Development of an Efficient Synthetic Process for Broflanilide. Organic Process Research & Development. 2020, Vol.24, No.6, p.1024.. Noriharu Umetsu, Yuichi Shirai. Development of novel pesticides in the 21st century. Journal of Pesticide Science. 2020, Vol.advpub, No.0, D20-201.. Noriharu Umetsu, Yuichi Shirai. Development of novel pesticides in the 21st century. Journal of Pesticide Science. 2020, Vol.45, No.2, p.54.. Emiliane Taillebois, Alison Cartereau, Jérôme Graton, et al. Synergic effect of a quinuclidine benzamide complexed with borane, the LMA10233, in combination with seven pesticides. Pesticide Biochemistry and Physiology. 2020, Vol.168, p.104633.. Peter Jeschke. Status and outlook for acaricide ...
Tutorial covering the alkene hydroboration/oxidation reaction, which converts an alkene into an alcohol with anti-Markovnikov regioselectivity and syn stereoselectivity.
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.. ...
Practice solving Alkyne Hydroboration problems. Master even the most complex scientific problems with our step-by-step explanation videos.
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.
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Highly Enantioselective Catalytic Allylboration of Ketiminoesters: Practical and Scalable Synthesis of α-Fully-Substituted Amino Esters