Ethylene Polymerization in the Presence
of Iron(II) 2,6-Bis(imine)pyridine Complex:
Structures of Key Intermediates¹

E. P. Talzi, D. E. Babushkin, N. V. Semikolenova, V. N. Zudin, and V. A. Zakharov

Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Received August 22, 2000

Abstract—The structures of intermediates generated by the activation of 2,6-bis[1-(2,6-dimethylphe-
nylimino)ethyl]pyridineiron(II) chloride (1) with various cocatalysts, methylalumoxane (MAO), trimethylalu-
minum (TMA), and TMA in combination with B(C₆F₅)₃ and Ph₃CB(C₆F₅)₄, is studied by ¹H and ²H NMR spec-
troscopy. The 1/AlMe₃ system exhibits a higher catalytic activity in ethylene polymerization than the 1/MAO
system. The activity of the latter decreases sharply with a decrease in the amount of AlMe₃ in MAO. Neutral Fe(II)
complexes rather than cationic intermediates are suggested to be active components in both catalytic systems.

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