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Ryutaro Wakabayashi, Kazufumi Kawahara and Kazuyuki Kuroda Nonhydrolytic Synthesis of Branched Alkoxysiloxane Oligomers Si[OSiH(OR)2]4 (R=Me, Et) Angewandte Chemie International Edition 49

Article first published online: 11 JUN 2010 | DOI: 10.1002/anie.201001640

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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.

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