METATHESIS OF SILICON-CONTAINING OLEFINS .8. SYNTHESIS OF ALKENYL (PHENYL, METHYL) SUBSTITUTED SILANES BY OLEFIN METATHESIS

1-Tri(phenyl, methyl)silyl-1-alkenes of the general formula RCH=CHSiMe3-nPhn (where n = 1-3, R = CmH2m+1, m = 5, 6, 8, 10, and 12; Ph) have been prepared by a novel method, viz. by a very effective cross-metathesis of vinyltri(phenyl, methyl)silanes with 1-alkenes and styrene catalyzed by ruthenium and rhodium complexes. A tenfold excess of 1-alkene in the reaction mixture gave stereospecific 1-tri(phenyl, methyl)silyl-1-alkenes (predominantly E-isomers) in high yields of up to 90% (in turn of vinylsilane). The products were identified by spectroscopic (IR, Raman, H-1, C-13 NMR and GC-MS) methods.