Action de trialkylsilanes sur des aldehydes aromatiques en presence de catalyseurs au nickel

The reactions of HSiEt3 have been studied with aromatic aldehydes using two types of nickel catalysts and under different experimental conditions. The three main reáctions are: ether oxide formation, hydrosilylation of the aldehyde to form alkoxysilane and formation of disilyloxy hydrobenzoinic derivative. The selectivity of the reaction is monitored by the catalyst and the experimental conditions; in particular we can obtain almost exclusively either the alkoxysilane or the disilyloxy derivative. The mechanisms of these reactions are proposed and discussed.