On the Ketene Alkylsilyl Acetal Preparations

Abstract
The action of zinc powder with α-bromoesters in the presence of trimethylsilylchloride and TMEDA-Et3N led mainly to E-ketenealkyl-silylacetals while the reaction of trialkylsilanes on alkyl acrylates catalyzed by Wilkinson reagent gave stereoselectively the Z isomers.