CATALYSIS OF HYDROSILYLATION .22. POLYMER-PROTECTED IMMOBILIZED PLATINUM COMPLEX CATALYSTS FOR GAS-PHASE HYDROSILYLATION OF ACETYLENE

A platinum catalyst (hexachloroplatinic acid dissolved in ethanol) was immobilized by anchoring via amine and mercapto groups to silica foll owed by formation of a polymer layer which protected the catalyst agai nst leaching. These catalysts (A and B) as well as precatalysts (S(A)- Pt, S(B)-PT) which were not protected by polymer were tested in the ga s-phase hydrosilylation reaction of acetylene with trichlorosilane. Th e catalytic parameters (yield 80%, selectivity 100%) obtained under op timal conditions prove the advantage of catalyst A over 300 h reaction time by the flow method.