Heck reactions catalyzed by oxide-supported palladium - structure-activityrelationships

The catalytic activity and selectivity of palladium supported on various me tal oxides in carbon-carbon coupling reactions of aryl bromides with styren e (Heck reaction) were investigated. The activity is determined by the natu re of the oxide support and the Pd dispersion (structure-activity relations hips). The relation of homogeneous (leaching) and heterogeneous mechanisms is discussed.