Pyridine linker pyrazolyl palladium complexes: Synthesis, characterization and ethylene polymerization activity

The reactions of bis(substituted-pyrazolylcarbonyl)pyridine compounds with [PdCl2(NCMe)2] produce catalyst precursors for ethylene polymerization, in which one of the pyrazolyl units does not coordinate to the palladium. When these precursors were activated with methylaluminoxane (MAO) they catalyzed the polymerization of ethylene to linear high-density polyethylene.