Nonhydrolytic synthesis of branched alkoxysiloxane oligomers Si[OSiH(OR)2]4 (R = Me, Et)

Abstract

Beyond silanol: A branched siloxane oligomer bearing terminal dialkoxysilyl groups was nonhydrolytically synthesized by direct alkoxysilylation of a tetraalkoxysilane with a chlorodialkoxysilane in the presence of the Lewis acid BiCl3 (see scheme). The reaction proceeds without the formation of intermediate silanol groups, and provides a selective route for siloxane-based oligomers. (Chemical equation presented) © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.