... Published by QYResearch at researchbeam.com . Global Boron Trifluoride Phenol Industry 2016 Deep Market Research Report is a research report by Key Manufacturers, Applications, Developments and Trends with covering regions China, US, Europe & Japan
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This page contains information on the chemical Boron trifluoride acetic acid complex, liquid including: 1 synonyms/identifiers; U.S. Code of Federal Regulations Title 49 Section 172 shipping regulations and proper shipping name; USDOT 2008 Emergency Response Guidebook initial response information.
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Additional investigations showed that other solvents were unsatisfactory, and both Pt and ammonia borane were essential for the hydrogenation reaction (table S3, entries 10 to 14). The loading of ammonia borane can be reduced to three equivalents without appreciable diminution in efficiency (table S4, entries 16 and 17). The use of 8 atm H2 to replace ammonia borane afforded 3a in only 37% yield (table S4, entry 18), suggesting that generation of the Pt-H species through alcoholysis of ammonia borane is more efficient than direct Pt-promoted H2 dissociation. Other borane sources, including borane tetrahydrofuran complex, borane dimethyl sulfide complex, (CH3)3N·BH3, (CH3)2NH·BH3, and tBuNH2·BH3 were inferior or exhibited no activity despite longer reaction times (table S4, entries 19 to 23). These results corroborate the critical role of Pt1/CeO2 and ammonia borane in the stereoselective hydrogenation of diazo compounds to E-hydrazones. The Pt1/CeO2 catalyst can be recycled five times with a ...
Tris(pentafluorophenyl)borane, 95%, ACROS Organics™ 5g; Glass bottle Tris(pentafluorophenyl)borane, 95%, ACROS Organics™ Boronic Acids and Derivatives
A series of new π-conjugated N→B-ladder boranes has been prepared in high yield by two-fold hydroboration of bifunctional quaterpyridine-, pyrimidine-, and 1,5-naphthyridine-based precursors with 9H-BBN and Piers borane ((C6F5)2BH). The structures of the several ladder-boranes have been confirmed by X-ray c
Alfa Chemistry is the worlds leading provider for special chemicals. We offer qualified products for 753-53-7(acetic acid--boron trifluoride),please inquire us for 753-53-7(acetic acid--boron trifluoride).
Over the years, Ive probably had more hits on my Sand Wont Save You This Time post than on any other single one on the site. That details the fun you can have with chloride trifluoride, and believe me, it continues (along with its neighbor, bromine trifluoride) to be on the Things I Wont Work With list. The only
see article for more reactions. Abstract. trans-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates undergo ring-opening rearrangement and the Nef reaction in the presence of BF3 OEt2 to give aroylmethylidene malonates. The products are potential precursors for heterocycles, such as imidazoles, quinoxalines, and benzo[1,4]thiazines.. ...
Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and full protective clothing. Evacuate area endangered by gas. Do not get water inside container. Move container from fire area if you can do it without risk. Stay away from ends of tanks. Cool containers that are exposed to flames with water from the side until well after fire is out. Isolate area until gas has dispersed.Extinguish with dry chemical, carbon dioxide, water spray, fog, or foam ...
BF3 based mixtures for selectively etching thin layers of silicon dioxide over silicon for use in the plasma etch process for integrated circuits manufacture is disclosed. In the process, when trace amounts of formaldehyde are added to the etch system the rate on oxide inceases markedly. The effect on the silicon is not substantial. The optional addition of an inert diluent gas did not substantially change these results.
Hydrogen is a potentially ideal alternative energy source for both environmental and economic reasons. The development of sustainable, efficient, and economical catalysts towards hydrogen generation from hydrogen storage materials (e.g., ammonia borane, AB) has been one of the active and challenging research
The N?D stretching region in the infrared spectrum of the ammonia complex of tris-(2-methoxymethyl-phenol)-borane containing one D atom has been examined. The N?D bands have been hole burned, and the resulting spectra reveal the reorientation kinetics of the ammonia. The ammonia is hydrogen bonded with the bond distances and reorientation barrier typical of other compounds. The N?D stretching frequencies are higher than those of comparison compounds.. ...
About 80% of this chapter is devoted to the particularly rich structural chemistry of boron. There are sections on elemental boron, metal and non-metal borides, boranes and carboranes, boric acids, and borates. In the section on boranes and carboranes, electron-counting rules are introduced to account for the relationship between the bonding and structures of these compounds. For the remaining Group 13 elements, there are sections on their organometallic compounds with novel features (such as bridged structures, M-M bonding, π bonding, etc.) and on naked anionic metalloid clusters. ...
The synthesis and structural analysis of two novel families of three-component reversible redox cycles [(C2B9H11)M(m-SPh)2]2nPPNn (M = Mo, n = 2-, 2; 1-, 3; 0, 4; and M = W, n = 2-, 6; 1-, 7; 0, 8), where the cleavage and re-formation of the carborane cage C-C bond is observed during the redox reaction, are reported. Electronic saturation of the metal center (18e center) and the lack of bulky substituents on the carborane cage suggest that the deformed carborane cages in 2·PPN2, 6·PPN2, and 7·PPN invoke a new kind of deformed cage (semicloso framework). The XPS results show that the unprecedented competition for electron density between the metal center and the carborane cage is involved in the cleavage and formation of the carborane C-C bond. ...
The Biginelli reaction is a multiple-component chemical reaction that creates 3,4-dihydropyrimidin-2(1H)-ones 4 from ethyl acetoacetate 1, an aryl aldehyde (such as benzaldehyde 2), and urea 3. It is named for the Italian chemist Pietro Biginelli. This reaction was developed by Pietro Biginelli in 1891. The reaction can be catalyzed by Brønsted acids and/or by Lewis acids such as copper(II) trifluoroacetate hydrate and boron trifluoride. Several solid-phase protocols utilizing different linker combinations have been published. Dihydropyrimidinones, the products of the Biginelli reaction, are widely used in the pharmaceutical industry as calcium channel blockers, antihypertensive agents, and alpha-1-a-antagonists. The reaction mechanism of the Biginelli reaction is a series of bimolecular reactions leading to the desired dihydropyrimidinone. According to a mechanism proposed by Sweet in 1973 the aldol condensation of ethylacetoacetate 1 and the aryl aldehyde is the rate-limiting step leading to ...
A process is provided for producing wear-resistant boride layers on metal material surfaces. The process is characterized in that a boron halide selected from the group comprising boron trifluoride, b
Reaction of 4-(1-hydroxy-1-methylethyl)-3-cyclohexen-1-one with a 5-substituted resorcinol in the presence of boron tribromide, boron trifluoride or stannic chloride provides, depending upon the durat
The structure of 2,3,7,8-tetramethyl-2,3,7,8-tetracarbadodecaborane(12) [(CH3)4C4B8H8], a carborane formed by air oxidation of [(CH3)2C2B4H4] 2CoH or [(CH3)2C2B4H4] 2FeH2, has been determined from a single-crystal x-ray diffraction study. The molecule is a distorted icosahedron, in which two carbon-carbon bonds have been severed to create two four-sided open faces, and consists of two pyramidal (CH3)2C2B4H4 units fused face-to-face with the four skeletal carbon atoms forming a contiguous chain. The polyhedral cage contains two more electrons than the icosahedral C2B10H12 system and is isoelectronic with the C2B10H12 2- ion. The geometry of (CH3)4C4B8H8 differs sharply from those of the only other structurally established 12-vertex nido systems, (C6H5)2C2B10H 11 - and (η5-C5H5)Fe(CH3) 4C4B7H8, each of which has a single large open face. The compound crystallizes in the monoclinic space group P21/n with a = 8.398 (3) Å, b = 11.420 (5) Å, c = 13.458 (7) Å, β = 90.61 (4)°, dobsd = 1.05 g cm-3, and
Zuschriften DOI: 10.1002/ange.201001198 Organocatalysis Metal-Free Catalytic Boration at the b-Position of a,b-Unsaturated Compounds: A Challenging Asymmetric Induction** Amadeu Bonet, Henrik Gulys,* and Elena Fernndez* Dedicated in memory of Lszl Gulys. Enantioenriched a-chiral boron compounds were first obtained using chiral rhodium-phosphine complexes from the catalytic hydroboration of prochiral alkenes.[1] There are three reasons why metal-mediated asymmetric induction in C B bond formation is more successful than existing methods involving interactions between the substrate and a chiral borane reagent[2] in the absence of a metal: 1) the low cost/ availability of the achiral borane reagent, 2) the milder reaction conditions, and, most importantly, 3) the possibility for optimization and maximization of the asymmetric induction by screening the chiral ligands. Considerable progress has since been made, particularly in relation to the enantioselective metal-mediated hydroboration,[3] ...
A possible solution is to store hydrogen in a safe chemical form. Earlier this year, Williams and his team figured out a way to release hydrogen from an innocuous chemical material - a nitrogen-boron complex, ammonia borane - that can be stored as a stable solid. Now the team has developed a catalyst system that releases enough hydrogen from its storage in ammonia borane to make it usable as a fuel source. Moreover, the system is air-stable and re-usable, unlike other systems for hydrogen storage on boron and metal hydrides. The research was published this month in the Journal of the American Chemical Society.. ...
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. ...
This is unique source of information on the chemicals manufactured and imported in Europe. It covers their hazardous properties, classification and labelling, and information on how to use them safely.. REACH. ...
The previously known anion [(C6F5)(3)B(mu-OH)B(C6F5)(3)](-) (2) has been prepared by a two-step procedure, involving deprotonation of (C6F5)(3)BOH2 to give [B(C6F5)(3)OH](-) (1), followed by addition of B(C6F5)(3). The solution structure and the dynamics of 2 have been investigated by H-1 and F-19 NMR spectroscopy. The reaction of [NHEt3]2 with NEt3 resulted in the formation of [NHEt3](+)[(C6F5)(3)BOH](-), [NHEt3](+)(C6F5)(3)[BH](-), and (C6F5)(3)B-(CH2CH=N+Et2). This indicates that in the presence of a nucleophile anion 2 can dissociate to B(C6F5)(3) and 1. The reaction of [HDMAN]2 with 1,8-bis(dimethylamino) naphthalene (DMAN) confirmed this trend. In the presence of water, 2 transformed into the adduct [(C6F5)(3)BO(H)(HO)-O-...(H)B(C6F5)(3)](-) (3), containing the borate 1 hydrogen-bonded to a water molecule coordinated to B(C6F5)(3). The same compound is formed by treating (C6F5)(3)BOH2 with 0.5 equiv of a base. A competition study established that for 1 the Lewis acid-base interaction with ...
Chemists in the US have developed a simple reaction to make ammonia borane - a powder more hydrogen-dense than even liquid hydrogen. Their one-pot synthesis of this promising hydrogen storage material is reported in the first issue of the new Royal Society of Chemistry journal Energy & Environmental Science.. Hydrogen has significant benefits as a fuel of the future: potentially renewable and sustainable, and, as hydrogen fuel cells emit only water, a green alternative to other more polluting fuels.. Storing hydrogen safely is tricky, however - pressurising hydrogen gas is clearly dangerous for everyday use, and it can only be stored as a liquid under cryogenic conditions.. Chemists like Tom Autrey from Pacific Northwest National Laboratory, US, are addressing the problem by designing materials to store hydrogen safely, such that it can be released at will to power a fuel cell.. Ammonia borane (AB) is a stable white powder which releases hydrogen gas upon heating. Its use as a hydrogen storage ...
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Conversion of Carbon Dioxide to Few‑Layer Graphene. Chakrabarti, A.; Lu, J.; Skrabutenas, J.C.; Xu, T.; Xiao, Z.; Maguire, J.A.; Hosmane, N.S.(2011) J. Mater. Chem., 21: 9491-9493.. Nano and Dendritic Structured Carboranes and Metallacarboranes: From Materials to Cancer Therapy. Hosmane, N. S.; Yinghuai, Z.; Maguire, J. A.; Kaim, W.; Takagaki, M. (2009) J. Organomet. Chem., 694: 1690-1697.. Synthesis, Characterization and Polymerization of a Neutral Tantalacarborane Sandwich Complex Derived from Quintanionic exo‑Polyhedrally Linked Bis(C2B10‑carborane) Ligands. Yinghuai, Z.; Nong, L. C.; Zhao, L. C.; Widjaja, E.; Hwei, C. S.; Cun, W.; Tan, J.; Van Meurs, M.; Hosmane, N. S.; Maguire, J. A. (2009) Organometallics, 28: 60-64.. Silicon (IV) and Germanium (IV) Moieties Stabilized by Charge‑Compensated Carborane Ligand, [9‑SMe2‑7,8‑C2B9H10]−: Synthetic and Structural Investigation. Vladimir Meshcheryakov, V.; Zheng, C.; Kudinov, A. R.; Maguire, J. A.; Hosmane, N. S.(2008) ...
Import Data And Price Of Pinacol Ester , www.eximpulse.com Eximpulse Services will provide you the latest and relevant market intelligence reports of Pinacol Ester Import Data. You can find live data of maximum number of ports of India which is based on updated shipment data of Indian Customs. Only previous two days data will be seen on website. You can use this Pinacol Ester import data for multiple kinds of analysis; lets say Import price, Quantity, market scenarios, Price trends, Duty optimization and many more. You can go through some of the sample shipment records for Pinacol Ester import data mentioned above. Here on Eximpulse Services you will get all kind of free sample as well as detailed reports of Export/ Import data as per your requirement. To get in touch for any kind of enquiry related to free sample or detailed report contact on +91-120-408-4957, +91-120-408-4958,+91-120-428-4019.. Data post 2012 as per Notification No.18/2012 - Customs(N.T.) and does not have names of Indian ...
Alfa Aesar™ 2-Amino-3-fluorobenzeneboronic acid pinacol ester, 96% 1g Alfa Aesar™ 2-Amino-3-fluorobenzeneboronic acid pinacol ester, 96% Aminof...
Alfa Aesar™ 4-Acetyl-3-fluorobenzeneboronic acid pinacol ester, 96% 1g Alfa Aesar™ 4-Acetyl-3-fluorobenzeneboronic acid pinacol ester, 96% Acetp...
The olefin cross metathesis reaction has been sequenced with four common organic transformations in a one-pot manner to rapidly access useful building blocks. Those reactions are: (1) phosphorus-based olefination (e.g., Wittig and Horner- Wadsworth-Emmons); (2) hydride reduction; (3) Evans propionate aldol reaction; and (4) Brown allyl- and Roush crotylboration. The products of these reactions include stereodefined 2,4-dienoates, trans allylic alcohols, syn-propionate aldols and chiral non- racemic homoallylic alcohols, respectively, which can be carried further in the context of chemical synthesis. Two approaches toward the total synthesis of cytotoxic polyketide natural product (+)-crocacin C have been accomplished. The first-generation approach used a Crimmins aldol reaction and reagent-controlled double asymmetric crotylboration (Brown and Roush) reaction, which was not selective. The first-generation approach was replaced altogether with a second that afforded (+)-crocacin C in 10 steps ...
The Hampton D. Smith Collection collection contains research and lab tests pertaining to the formation of undiscovered carboranes and nitriles created by Smith and other collaborators. The collection contains raw data spanning a period of over fifteen years (1974-1990), and several formal proposals pertaining to theories developed from that data. The correspondence is primarily between Smith and chemists at other prominent universities and colleges, and discuss the possible theories regarding the synthesis and formation of carboranes. ...
Borane, stabilized by the bicyclic guanidine hppH, undergoes a thermal B-N dehydrocoupling reaction to give the diborane [H2B(hpp)]2. Catalytic B-B dehydrocoupling gives in high yield [HB(hpp)]2 with a direct B-B bond. We tested several catalysts to find the optimal conditions. With the best catalysts, we achieve complete transformation to [HB(hpp)]2 at 110 °C in less than 40 min.. ...
You may also wish to search for items by Herrero. 7 matching references were found. Lago, A.F.; Jimenez, P.; Herrero, R.; Dávalos, J.Z.; Abboud, J.-L.M., Thermochemistry and Gas-Phase Ion Energetics of 2-Hydroxy-4-methoxy-benzophenone (Oxybenzone), J. Phys. Chem. A, 2008, 112, 14, 3201-3208, https://doi.org/10.1021/jp7111999 . [all data] Herrero, R.; Davalos, J.Z.; Abboud, J.L.M.; Alkorta, I.; Koppel, I.; Koppel, I.A.; Sonoda, T.; Mishima, M., The intrinsic (gas-phase) acidities of bridgehead alcohols - An experimental (FT-ICR) and computational study, 5Int. J. Mass Spectrom., 2007, 267, 1-3, 302-307, https://doi.org/10.1016/j.ijms.2007.02.056 . [all data] Hurtado, M.; Yanez, M.; Herrero, R.; Guerrero, A.; Davalos, J.Z.; Abboud, J.L.M.; Khater, B.; Guillemin, J.C., The Ever-Surprising Chemistry of Boron: Enhanced Acidity of Phosphine center dot Boranes, Chem. Eur. J., 2009, 15, 18, 4622-4629, https://doi.org/10.1002/chem.200802307 . [all data] Davalos, J.Z.; Guerrero, A.; Herrero, R.; Jimenez, ...
In a comment to my post on putting out fires last week, one commenter mentioned the utility of the good old sand bucket, and wondered if there was anything that would go on to set the sand on fire. Thanks to a note from reader Robert L., I can report that there is indeed such a reagent: chlorine trifluoride. I have not
Living polymer synthesis methods for the synthesis of oligomeric and high molecular weight polymers with low polydispersity are disclosed. The disclosed methods are based on the discovery that the reaction of a ylid with an organoborane at a high ylid:borane ratio and high temperature provides for the synthesis of high molecular weight polymers with low polydispersity.
Schiff bases are used as ligands to form complexes with metals and borane and such complexes have application in non-linear optical dyes (Rodríguez et al., 2012; Reyes et al., 2004) and as anion sensors (Hijji et al., 2009; Muñoz et al. 2008). Related structures were reported by (Gül et al., 2007; Muñoz et al., 2008; Valkonen et al., 2012; Hijji et al., 2014).. The title compound is a Schiff base prepared by the reaction of 4-di-methyl-amino-benzaldehyde with 2-amino-5-nitro-phenol under microwave conditions.It crystallized with two molecules (A and B) in the asymmetric unit, Fig. 1. Each molecule adopts an E conformation about the C=N imine bond: C7A═N2A in A and C7B═N2B in B. The two molecules in the asymmetric unit have minor differences in their conformations: In molecule A the dihedral angle between the nitro group (N1A/O2A/O3A) and its benzene ring (C1A-C6A) is 2.1 (2)° and between the two benzene rings (C1A-C6A and C8A-C13A) is only 0.88 (7)°, while for molecule B the ...
Two members of the poly-m-carboranesiloxane family were selected for extensive testing to determine their ppotential in high temperature applications between 500 and 900 F. Efforts were concentrated on an insoluble raw gum which lends itself primarily to molding operations; its synthesis was developed into a routine operation. Volatile loss determinations, long term heat-aging studies, compression set tests, shrinkage and electrical property measurements were conducted on variably compounded vulcanizates. Their tensile strength and elongation could be improved by increased filled loading in conjunction with modified molding techniques. End use items such as O-rings and other seals, diaphragms and electrical connector inserts are now undergoing application testing. For coatings and related uses, a soluble viscous liquid form is best suited and can be easily applied on metals or fabrics from aromatic solvents. Curing does not require peroxides and is achieved between 300 and 600 F. (Author)(*BORANES
A cobalt-based alloy electroless plating solution according to the present invention comprises a cobalt precursor, a tungsten precursor, a phosphorus precursor, a reducing agent, a complexing agent, a pH regulator and a stabilizer, in which the reducing agent is dimethylamine borane (DMAB) or borohydride and the stabilizer is one or more compounds selected from a group consisting of imidazole, thiazole, triazole, disulfide and their derivatives; and which is stable enough for long-term reuse and prevents deterioration of metal thin-film quality by inhibiting the formation of a precipitate.
Strontium amidoborane, Sr(NH2BH3)2, is synthesized by gently milling the powder mixtures of SrH2 and ammonia borane (in a 1:2 molar ratio), followed by ...
N-Acyl imidazoles and catalytic isothiourea hydrochloride salts function as ammonium enolate precursors in the absence of base. Enantioselective Michael addition-cyclization reactions using different α,β-unsaturated Michael acceptors have been performed to form dihydropyranones and dihydropyridinones with high stereoselectivity. Detailed mechanistic studies using RPKA have revealed the importance of the "imidazolium" effect in ammonium enolate formation and have highlighted key differences with traditional base-mediated processes ...
We demonstrate an efficient protocol for the chemoselective hydroboration of organic nitriles with pinacolborane (HBpin) and catecholborane (HBcat) using aluminum alkyl complex [κ2‐{2‐F‐C6H4NP(Se)Ph2}2Al‐(Me)] as a pre‐catalyst to afford diboryl amines under solvent‐free and mild conditions (60°C) in high yield. The aluminum complex was prepared by the reaction of [2‐F‐C6H4NHP(Se)Ph2] and trimethylaluminum in toluene. The solid‐state structure of Al complex is established. Nitriles with a wide array of electron‐withdrawing and electron‐donating functional groups were easily converted to the desired products through the formation of aluminum hydride as an active species. A kinetic study of the catalytic reaction is also reported.. ...
Zistiť viac o 4-Acetoxy-3-methoxyphenylboronic acid pinacol ester. Umožňujeme pokrok vo vede ponukou výberu produktov, služieb, excelentnosti procesov a našich ľudí, ktorí ich zabezpečujú.
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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.
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 ...