Rhodium(I) complexes of β-diketonates and related ligands as hydrosilylation catalysts

Abstract

The complexes (OO)Rh(CH 2CH 2) 2 ((OOH) = FcC(O)CH 2C(O)CH 3, PhC(O)CH 2C(O)CH 3, 1,2-(CH 3CO)(OH)C 6H 4, 3-benzoyl-(+)-camphor) are catalysts for the hydrosilylation of PhMeCO with Ph 2SiH 2. The optical yield from the reaction catalyzed by the camphor derivative is too low to measure. Only low optical yields (max 8.7% e.e.) are obtained from the same reaction by using similar in situ catalysts with ligands prepared from (+)-PhCH(Me)NH 2. Bases such as H − and PhCH(Me)NH − catalyze the hydrosilylation reaction in the absence of rhodium salts, but only low optical yields are obtained. Ph 2SiH 2 reacts with 2-cyclohexen-1-one under these conditions and the mode of reaction depends on the reaction conditions.