Sonochemical hydrosilylation of 2-substituted cyclohexanones in the presence of Wilkinson complex

The sonochemical hydrosilylation of alkyl substituted cyclohexanones catalyzed by Rh(PPh3)3Cl is described. The application of ultrasonic irradiation during the reaction highly enhances the reaction rates and produces higher yields than those obtained in silent reactions. The stereoselectivity of the reaction has not been changed, the isomeric distribution, i.e. the cis/trans ratio of the 2-substituted cyclohexanols formed, is very close to those obtained in conventional stirred reactions.