Abstract

Pure cis-vinylsilanes are efficiently converted to cis-epoxysilanes which react smoothly with Li 2Cu(CN)(CH 2TMS) 2 to provide the corresponding erythro disilylated alcohol, in excellent yield and isomeric purity. Elimination of the elements of TMSOH affords either the pure cis- or trans- γ-substituted allylsilanes, under basic or acidic conditions, respectively.

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