Surprising activity for Group 4 polyolefin catalysts [M{(OAr)2py}Cl2(thf)] (M = Zr, Ti) bearing tridentate pyridine-2,6-bis(aryloxide) ligands

Unexpectedly high ethylene polymerisation activity is observed for zirconium(IV) catalysts supported by a rigid tridentate pyridine-bis(phenolate) ligand in conjunction with MAO; a methodology towards analogues with unsymmetric ligands and the significance of the coordinated solvent molecule are described.

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