Classes of mainly nickel(II) and palladium(II) complexes are comparatively presented in their norbornene polymerization activity to vinyl polynorbornene when activated with methylalumoxane, MAO, tris(pentafluorophenyl)borane/triethylaluminum, B(C6F5)3/AlEt3 or even B(C6F5)3 alone. Classes include Ni and Pd complexes with α‐dioxime ligands, salts with [PdCl4]2− and [Pd2Cl6]2− units, dinuclear Ni and Pd complexes with multidentate Schiff‐base ligands, polynuclear Ni‐ and Cr/Ni‐carboxylate cage complexes, and dihalo(bisphosphane) Ni and Pd complexes. The study of activation mechanism by 31P‐ and 19F‐NMR together with X‐ray structural data points to the formation of PdCl2 units and “naked” Pd2+ cations as highly active species.
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Janiak et al. (2006) studied this question.
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