Synthesis and Behavior of α-Iminocarboxyamide Nickel and Zirconium Catalysts Towards Olefin Polymerization

Synthesis and investigations of Nickel-based olefinoligomerization and polymerization catalysts, α-Iminocarboxyamideì3-Penzyl Ni(II) Complex(2) is reported. The attempt to improve theyield of the synthesis of the above mentioned catalysts by the directreaction of the potassium salt of the ligand, Ni(COD)2(bis(1,5-cyclooctadiene)-nickel, and Benzyl halide in THF and startingtemperature of -35°C. Led instead to disclose that the less hinderedN-aryal moieties on the diimine complexes the more difficult tosynthesize the ethylene polymerization catalyst, Instead, yielding thedi α -Iminocarboxyamide Ni-complex(5) which is inactive towardsethylene polymerization. This promoted us to synthesize the complexdi α-Iminocarboxyamide Zr-complex(6) which is activated by MAOfor ethylene polymerization.