289-53-2Relevant articles and documents
Addition compounds of alkali-metal hydrides. 26. Facile reaction of borinic esters with lithium monoethoxyaluminohydride to form lithium dialkylborohydrides
Singaram, Bakthan,Cole, Thomas E.,Brown, Herbert C.
, p. 1520 - 1523 (2008/10/08)
Addition of 1 mol equiv of borinic esters to lithium monoethoxyaluminohydride in ethyl ether at 0°C results in a facile and rapid precipitation of the dialkoxyalane as a solid, producing the corresponding lithium dialkylborohydride in quantitative yield. The reaction is quite general, applicable to borinic esters of widely varied structural requirements. These derivatives are very stable and can be stored under nitrogen at 25 °C without hydride loss and either redistribution or isomerization of the alkyl groups. Methyl iodide or acids readily and quantitatively removes metal hydride from these dialkylborohydrides, generating the free dialkylboranes for further use. Thus the present study provides a simple method for preparing a wide variety of lithium dialkylborohydrides under mild conditions, valuable intermediates for storing dialkylboranes for extended periods of time, and a simple procedure for generating pure dialkylboranes as required for further application.
