Cationic methylpalladium complexes with hemilabile bidentate ligands of α-amino-pyridines, in the form of {[R1HNCR2H (o-C6H5N)] Pd (Me)(NCMe)}(BF4)(R1= iPr, tBu, Ar R2= H, Me) have been found to be effective precursors for catalytic copolymerization of ethylene and ...