Cationic group 4 metal alkyl complexes containing tetradentate Schiff base ligands, (acen) Zr(R)+ and (F6‐acen) Zr(R)+, are prepared by protonolysis of suitable neutral dialkyl precursors. These complexes display electrophilic behavior and are moderately active ethylene polymerization catalysts in the presence of 1 molar equivalent of AlR3.
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