Kinetics of Borohydride Hydrolysis

Asymmetric Reduction of Ketones Under Mild Conditions Using NaBH4 and TarB‐NO2: An Efficient and Unusual Chiral Acyloxyborohydride Reducing System

“…[43] For comparison, the experimental activation energy for the reduction of acetone by sodium borohydride in water is 7.6 ± 0.5 kcal/mol. [44] We conclude from these calculations that TarB-NO 2 dramatically lowers the activation energy for reduction of ketones with borohydride reagents and provides a pathway for the hydride to be delivered in a stereoselective manner.…”

Hydrolysis of sodium borohydride with steam

“…Almost all prior work uses an excess of liquid water, with a catalyst or promoter to achieve high yields and rates. NaBH 4 has been extensively studied as a hydrogen storage media because it is readily available, relatively inexpensive, and more stable than lithium borohydride or the aluminum hydrides [1][2][3][4][5][6][7][8][9][10][11]: NaBH 4 + (2 + x)H 2 O → 4H 2 + NaBO 2 · xH 2 O + heat. (1) A critical issue in developing an efficient hydrogen generator from NaBH 4 is the amount of water needed for reaction.…”

“…For example, in aqueous hydrolysis of NaBH 4 , an acid or a catalyst is required [4][5][6][7][8][9][10][11] to liberate 100% of the hydrogen, because dissolved NaBH 4 is stable in basic solution, and the by-products (sodium borate and similar compounds) are basic in solution.…”

“…Investigations [8,9,12] show that the hydrolysis of NaBH 4 is catalyzed by organic and mineral acids. Complete hydrolysis of the borohydride may be achieved rapidly by the addition of acid to an aqueous solution of NaBH 4 .…”

Mechanisms of chemical generation of volatile hydrides for trace element determination (IUPAC Technical Report)

“…The degree of uncertainty in estimating k' could, in some cases, be relatively high. This uncertainty is due both to the contributions of the single experi- [69][70][71][72]. The only exceptions are the studies by Jolly and coworkers [60,64].…”