The scope of the B(C 6 F 5 ) 3 -catalyzed hydrosilylation of (X)Ph-CH=O and (X)Ph-C(R)=O was expanded to include a large set of substitutents (X = H, , m-NO 2 , p-Et; R = Me or CF 3 ). Reactions proceed at room temperature with high chemoselectivity in a host of solvents (toluene, benzene, CCl 4 , 1,2-dichloroethane, and methylcyclohexane), or under solventless conditions, with hydrosilylation yields ranging from 85 to 95 % (for aldehydes) and 71 to 100 % (for ketones) and no noticeable solvent dependency of hydrosilylation yields. Replacing B(C 6 F 5 ) 3 for M(OTf) 3 (M = Bi, Al, Ga, Sc) causes a dramatic change in
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