The Regioselective Hydroformylation of Ally1 Acetate Catalysed by Cationic and Zwitterionic Rhodium Complexes ... Howard Alper" and Jian-Quiang Zhou Ottawa-Carleton Chemistry Institute, Department of Chemistry, Ottawa, Ontario Kl N 6N5, Canada ... Cationic and zwitterionic rhodium complexes, with added 1,4-bis(diphenyIphosphino)butane (dppb), are efficient catalysts for the highly regioselective hydroformylation of allyl acetate and related esters to yield ...