SELECTIVE HYDROBORATION OF OLEFINS CATALY ZED BY NEW CATIONIC RH(I) COMPLEXES HETEROGENIZED ON ZEOLITES

The synthesis and characterization of new cationic Rh(I) complexes wit h NN-ligands (1a, 1b) and NP-ligands (2a, 2b) are reported. The comple xes bearing the triethoxysilil group were covalently bonded to a modif ied USY zeolite to give heterogenized catalysts. The reaction of 1-dec ene, cyclohexene and styrene with catecholborane in presence of 1% mol of new prepared homogeneous and heterogenized Rh catalysts proceed re giselectively to give, after oxidation, 1-decanol, cyclohexanol and 1- phenylethanol respectively in excellent yields, whilts the more bulky 1-methylstyrene did not react at the same operation conditions.