Catalytic Behavior of Rhodium(I) Complexes in Hydrogermylation and Hydrosilylation of Phenylacetylene

Abstract

Rhodium complexes, Rh(L)(C2H4)2 {L=(CH3C=O)2CH (acac), and (CF3C=O)2CH (hfa)}, catalyze hydrogermylation and hydrosilylation of phenylacetylene with Bu3GeH and R3SiH (R=Bu, Et), respectively, to produce Ph(R3M)C=CH2 (M=Ge, Si) selectively. Other rhodium complexes, that is, [RhCl(C2H4)2]2, Rh2Cl2(cod)2, Rh(tmhd)(C2H4)2 {tmhd=(t-BuC=O)2CH}, and Rh(dbm)(C2H4)2 {dbm=(PhC=O)2CH}, also catalyze these reactions, but with less regioselectivity.