Si-(2-ethoxycarbonylvinyl)-substituted trifluoro- and triethoxysilanes andtrans-1-(2-ethoxycarbonylvinyl)silatrane

Hydrosilylation of (ethoxycarbonyl)acetylene with triethoxysilane was used to obtain triethoxy-(2-ethoxycarbonylvinyl)silane as a mixture of cis and t rans isomers. This mixture under the action of the boron trifluoride-ether complex readily converts to a mixture of respective isomers of (2-ethoxycar bonylvinyl)trifluorosilane. trans-Triethoxy(2-ethoxycarbonylvinyl)silane re acts with triethanolamine to give trans-1-(2-ethoxycarbonylvinyl)silatrane in quantitative yield. Transetherification of the isomeric mixture of triet hoxy-(2-ethoxycarbonylvinyl)silane with triethanolamine, too, yields trans- 1-(2-ethoxycarbonylvinyl)silatrane Along with this silatrane and ethanol, t he latter reaction gives 1-ethoxysilatrane and vinyl acetate.