The Palladium Catalyzed Carbonylation of Styrene. Effects of the Phosphines on the Products

Abstract

Abstract The carbonylation of styrene with carbon monoxide and ethanol was investigated in the presence of diphosphine palladium complexes Pd[Ph2P(CH2)nPPh2]Cl2 (n=1–6,10). Ethyl 3-phenylpropionate was obtained significantly when the phosphines (n=3,4,5) were used. The predominant isomer in the case of the phosphines (n=l,6,10) was ethyl 2-phenylpropionate similar to the mono-dentate phosphines, such as Ph3P and Ph2PBu.