Alternating ethylene-norbornene copolymerization catalyzed by cationicorganopalladium complexes bearing hemilabile bidentate ligands ofa-amino-pyridines

摘要

Cationic methylpalladium complexes with hemilabile bidentate ligands of α-amino-pyridines, in theform of {[R1HNCR2H(o-C6H5N)]Pd(Me)(NCMe)}(BF4) (R1 = iPr, tBu, Ar R2= H, Me) have beenfound to be effective precursors for catalytic copolymerization of ethylene and norbornene under mildconditions. The copolymer products exhibit predominant alternating microstructures which areevidenced by NMR and mass spectrometry as well as a kinetic analysis according to the Finman-Rossrelationship.