Abstract
AbstractTwo sterically demanding iminopyridine ligands, (2,6‐diisopropylphenyl)[6‐(2,4,6‐triisopropylphenyl)pyridin‐2‐ylmethylene]amine and (2,6‐diisopropylphenyl)[6‐(2,6‐dimethylphenyl)pyridin‐2‐ylmethylene]amine, were prepared by a two‐step process: first, condensation of 6‐bromopyridine‐2‐carbaldehyde with an equimolecular amount of 2,6‐diisopropylaniline, and second, Kumada‐type coupling of in‐situ‐formed Grignard compounds of 1‐bromo‐2,6‐dimethylphenyl and 1‐bromo‐2,4,6‐triisopropylphenyl. Dichlorido complexes of the ligands were synthesized starting from FeCl2, [PdCl2(cod)], [NiCl2(dme)], and CoCl2 (cod = 1,5‐cyclooctadiene, dme = dimethoxyethane). X‐ray crystal structure analyses of a Fe, Pd, and Co complex were determined. Ethylene polymerization/oligomerization behavior of the dichlorido complexes after activation with methylaluminoxane or triethylaluminum was studied. Ethylene dimerization selectivity greater than 95 % was observed.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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