Metal supported catalysts obtained by sol-gel in the hydrosilylation of phenylacetylene with [R.sub.3]SiH organosilanes ([R.sub.3] = [Ph.sub.3], [Ph.sub.2]Me, and Ph[Me.sub.2])

The hydrosilylation reaction of phenylacetylene, generated on the surface of 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 products. The products' distribution, specific activity, and turnover reactions were determined for the case of the hydrosilylation reaction of PhC[equivalent]CH with [R.sub.3]SiH (R = [Ph.sub.3], [Ph.sub.2]Me, and Ph[Me.sub.2]). For [Ph.sub.3]SiH and [Ph.sub.2]MeSiH, the presence of [beta]-trans and [alpha] isomers is observed. Addition of Ph[Me.sub.2] SiH 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. Key words: vinylsilanes, cataleseur sol-gel, hydrosilylation et phenylacetylene.