New hydrosilylation reaction of arylacetylene accompanied by C-H bond activation catalyzed by a xantsil ruthenium complex

Tobita, Hiromi; Yamahira, Nobukazu; Ohta, Keisuke; Komuro, Takashi; Okazaki, Masaaki

doi:10.1351/pac200880051155

Pure Appl. Chem., 2008, Vol. 80, No. 5, pp. 1155-1160

http://dx.doi.org/10.1351/pac200880051155

New hydrosilylation reaction of arylacetylene accompanied by C-H bond activation catalyzed by a xantsil ruthenium complex

Hiromi Tobita¹, Nobukazu Yamahira¹, Keisuke Ohta¹, Takashi Komuro¹ and Masaaki Okazaki²

¹ Department of Chemistry, Graduate School of Science, Tohoku University,Sendai 980-8578, Japan
² International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

Abstract: A new type of catalytic hydrosilylation of arylalkynes was induced by a 16-electron ruthenium bis(silyl) phosphine complex, resulting in ortho-silylation of the aryl group as well as a hydrogenation of the alkyne CC bond to give an (E)-form of alkene selectively. On the other hand, the same reaction using a related bis(silyl) complex having an η⁶-toluene ligand instead of the phosphine ligand as a catalyst led to a normal hydrosilylation reaction to afford silylalkene.