Ligand and anion effects of palladium catalyst for CO/ethylene copolymerization

Six complexes of two series were studied as the catalyst precursors for CO/ethylene copolymerization by using catalytic evaluation method and EXAFS technique. The first series of the complexes has general formular (L)Pd(OCOCF3)(2) in which L is DPPPr, DPPBu or DPPEt. The second series of the complexes has general formular (DPPPr)Pd(A)(2) in which A(-) is CF3COO-, P - CH3PhSO3-, Cl- or CH3COO-. The results showed that suitable ligands have relatively strong coordination ability to palladium ( II ) center. Suitable anoins belonging to strong acids, have excellent stability on cationic palladium( II ), and easy to leave away to give coordination vacant to comonomers.