Direct synthesis of polycarbonate from carbon monoxide and bisphenol A using efficient Pd complex catalyst systems

Communication: A direct oxidative carbonylation procedure of Bisphenol A to polycarbonate catalyzed with efficient Pd complex systems has been develop ed. Pd/2,2'-bipyridyl complexes possessing 6,6'-dimethyl substituents, Pd/2 ,2'-biquinoline complexes, and dinuclear Pd complexes bridged with a pyridy lphosphine ligand were found to give higher molecular weights and yields th an conventional Pd catalyst systems. higher molecular weight (M-n = 5 600, (M) over bar (w) = 12 900) and yield (86%) were obtained using the Pb/6,6'- dimethyl-2,2'bipyridyl complex system.