Metal supported catalysts obtained by sol-gel in the hydrosilylation of phenylacetylene with R3SiH organosilanes (R-3 = Ph-3, Ph2Me, and PhMe2)

The hydrosilylation reaction of phenylacetylene, generated on the surface o f solid catalysts (such as Pt and Ru) supported on inorganic matrices such as MgO obtained by the sol-gel process, yields vinylsilanes as the main pro ducts. The products' distribution, specific activity, and turnover reaction s were determined for the case of the hydrosilylation reaction of PhC tripl e bond CH with R3SiH (R = Ph-3, Ph2Me, and PhMe2). For Ph3SiH and Ph2MeSiH, the presence of beta -trans and alpha isomers is observed. Addition of PhM e2SiH to phenylacetylene leads to the formation of beta (cis and trans) and alpha isomers. These catalytic systems provide a new synthetic route to Si -C bond formation.