Ni(II) and Pd(II) complexes bearing novel chiral bis(β-ketoamino) ligand and their catalytic activity toward copolymerization of norbornene and polar norbornene derivatives

A series of novel Ni(II) and Pd(II) complexes bearing chiral bis(β-ketoamino) ligand were synthesized characterized. The exhibited high activities for norbornene homopolymerization with only B(C 6 F 5 ) 3 as cocatalyst, complex even up to 1.38 ×10 g polymer /mol Ni ·h. All the had good thermal stability. Most importantly, also displayed 10 metal ·h toward copolymerization 5-norbornene-2-yl acetate molecular weights tunable content. activity, weight, feed ratio higher than those Pd complex.