The color change from yellow to violet allows the formation of the intermediate [Cp Ti(SiHMePh)(pyridine)] to be monitored in the reaction of PhMeSiH with a pyridine in the presence of the precatalyst [Cp TiMe ] [Eq. (a)]; the hydride [Cp TiH] is postulated to be the key intermediate in the catalytic cycle. The regioselective hydrosilylation of pyridine and also substituted pyridines can be catalyzed by the titanocene [Cp TiMe ]. R=Me, CO Et.
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