w-(Methylmercapto)undecyltrimethoxysilane was prepared from w-chloroundecene via mercaptomethylation with NaSMe in absolute ethanol, followed by hydrosilylation with (MeO)3SiH in the presence of Pt(PPh3)4 as catalyst. The Si monomer was hydrolyzed and immobilized with water and fumed silica, then reacted with K2PtCl4 in acetone to give the title complex. The structure of this complex was characterized by elemental anal. and XPS. It is an effective catalyst for the hydrosilylation of decene, dodecene, Ph allylether, allyl glycidylether, etc., with (EtO)3SiH. The yields of adducts are usually >85%. The hydrosilylation is not sensitive to the reaction atomsphere The catalyst can be reused several times without serious loss of activity.

Key words: ETHANOL, CATALYSIS, ELEMENTAL ANALYSIS, MERCAPTO GROUP, ALKENE P, PLATINUM COMPLEX, PHOTOELECTRON SPECTROSCOPY, C11 COMPOUNDS, C11 COMPOUNDS, POLYSILOXANE, METHANETHIOL