The Decomposition of a-Nitrocarboxylic Acids: With Some Remarks on the Decomposition of B-Ketocarboxylic AcidsPederson,KaiJ. Phys. Chem.
Vol.38(5) 1934 pp.559–571
DOI: 10.1021/j150356a001
http://pubs.acs.org/doi/abs/10.1021/j150356a001AbstractThe object of this paper is to contribute to our understanding of the tendency of a-nitrocarboxylic acids to split off carbon dioxide.
> CNO[size=-2]2[/size].COOH --> CHNO[size=-2]2[/size] + CO[size=-2]2[/size]
The simplest acid of this type, nitroacetic acid, was studied kinetically by Heuberger (2,3) and, independently, by the author of this paper (7). In the latter work, the rate of decomposition was determined on solutions of hydrochloric acid of various concentrations and in buffer solutions, mainly acetate buffers (pH = 4 to 5). The rate increases with decreasing hydrogen-ion concentration and reaches a maximum value in the acetate buffers. Here it is independent of the hydrogen-ion concentration. In sufficiently alkaline solution nitroacetic acid is stable.
Preparation of Diborane from Lithium Hydride and Boron Trihalide Ether ComplexesElliot,J;Boldebuck,E;Roedel,GJ. Am. Chem. Soc.
Vol.74(20) 1952 pp.5047–5052
DOI: 10.1021/ja01140a017
http://pubs.acs.org/doi/abs/10.1021/ja01140a017AbstractThe preparation of diborane from lithium hydride and boron trihalide etherates under different conditions is described and secondary reactions are discussed. The reaction between lithium hydride and boron trifluoride in ethyl ether has been shown to proceed by two different courses. If ether-soluble, active hydrogen-containing promoters are present, or if pressure is used to force the reaction between lithium hydride and diborane, the hydride is converted completely to lithium borohydride and lithium fluoride before diborane is evolved. In the absence of soluble promoters, diborane escapes continually from the solution, lithium borofluoride is formed and lithium borohydride does not accumulate. If less than a specified ratio of borohydride to hydride exists in the ether solution, the borohydride is consumed in the continuing reaction, and diborane is evolved. In tetrahydrofuran, a promoter is not required for the conversion of lithium hydride to lithium borohydride. Since the solubility of diborane is relatively high in tetrahydrofuran, conditions favor the production of borohydride by reaction of diborane with lithium hydride, as in the pressure reaction with ether as solvent.
Reaction between the Ether Complex of Boron Trifluoride and Lithium Hydride Communication. 1. Preparation of Pure DiboraneMikheeva,V;Fedneva,ERussian Chem. Bull.
Vol.5(8 ) 1956 pp.925-934
DOI: 10.1007/BF01166405
http://www.springerlink.com/content/x8245352g00v5048/Summary 1. The reaction of lithium hydride with boron trifluoride etherate has a complex mechanism, which probably includes various parallel and successive reactions leading to the formation, as the ultimate boron-containing products, of diborane, lithium borohydride, and lithium fluoborate. The yield of diborane is dependent on reaction temperature, relative amounts of reactants, degree of agitation of the reaction mixture, and order of addition of reactants.
2. An almost quantitative yield with respect to both reactants is attained by carrying out the reaction at somewhat raised temperature (25–30°) in the initial stage, at a BF3 : LiH ratio of 1 : 2,4–2.8, and with gradual addition under constant stirring of lithium trifluoride etherate to lithium hydride.
3. The reaction studied is the simplest and most economical method for the preparation of highly pure diborane under laboratory conditions, and it opens up wide possibilities for the further study of the chemistry of boron hydrides and their derivatives.
Deuterium-Exchange Reaction on Trimethylamine-Borane with Sulfonate Cation Exchanger in the Deuterio FormMuraviev,D;Rogachev,I;Bromberg,L;Warshawsky,AJ. Phys. Chem.
Vol.98(2) 1994 pp.718–724
DOI: 10.1021/j100053a055
http://pubs.acs.org/doi/abs/10.1021/j100053a055AbstractThe kinetics of H-D exchange on trimethylamino-borane in bi- and triphase systems involving sulfonate cation exchangers in the D
+ form show that the rate of isotope exchange is lower in triphase systems in comparison to the liquid-liquid extraction system; nevertheless the yield of deuterated product in polymeric deuterating systems is essentially much higher than that obtained in applying liquid deuterating agents. The cation-exchange resin when applied in a triphase system demonstrates ambivalent behaviour, acting as a catalyst toward deuterio-exchange reaction and as a suppressor towards the hydrolysis of TMAB. The hydrolysis of TMAB results in the formation of trimethylamine which accelerates the hydrolysis and inhibits the H-D exchange by saturation of the SO
3- resin sites. The immobilization of the aqueous phase (D
2O) in swollen ion exchanger creates unique conditions for isotope exchange, completely suppressing hydrolytic side reactions, and pure deuterated product can be acheived in quantitive yield.
Lithium Aluminum Hydride, Aluminum Hydride and Lithium Gallium Hydride, and Some of their Applications in Organic and Inorganic ChemistryFinholt,A;Bond,A;Schlesinger,HJ. Am. Chem. Soc.
Vol.69(5) 1947 pp.1199–1203
DOI: 10.1021/ja01197a061
http://pubs.acs.org/doi/abs/10.1021/ja01197a061AbstractWhen lithium hydride is treated with an ether solution of aluminium chloride under the conditions described in the experimental part of this paper, the new ether soluble compound, lithium aluminium hydride, LiAlH
4 is formed according to the equation:
4LiH + AlCl
3 ----> LiAlH4 + 3LiCl
Addition of further quantities of aluminium chloride yields an ethereal solution of aluminium hydride:
3LiAlH
4 + AlCl
3 ----> 4AlH
3 + 3LiCl.
Syntheses of the Alkali Metal BorodeuteridesAtkinson,J;MacDonald,D;Stuart,R;Tremaine,PCan. J. Chem
Vol.45(21) 1967 pp.2583-2588
http://article.pubs.nrc-cnrc.gc.ca/ppv/RPViewDoc?issn=1480-3291&volume=45&issue=21&startPage=2583AbstractA synthesis of sodium borodeuteride on a molar scale has been developed. Trimethylamine-borane was exchanged (6) with deuteriosulfuric acid in deuterium oxide to obtain trimethylaminborane-d
3 of a high isotopic purity. Reaction of trimethylaminborane-d
3 with sodium methoxide in diglyme at 120-150'C yielded sodium borodeuteride, which, after purification, was obtained in a 40-50% overall yield. The conditions for obtaining material of a high isotopic and chemical purity were found to be rather stringent but, once worked out, were easily reproducible.