Preparation and properties of methylaluminium tetrahydroborates and their reactions with some Lewis bases
Abstract
The methylaluminium tetrahydroborates Al(BH4)2Me and Al(BH4)Me2 have been prepared from AlMe3+ 2 or ½Al(BH4)3, and from AlMenCl3–n and (3 –n)Li[BH4](n= 1 or 2). They are volatile compounds which inflame in air, vaporise as the monomers, and form the following adducts: Al(BH4)2Me·L (L = NMe3, NMe2H, PMe3, AsMe3, OMe2, OEt2, and SMe2) and Al(BH4)Me2·L (L = NMe3, PMe3, and OEt2). Features of the i.r. and n.m.r. spectra of these compounds are reported and discussed.