Nickel(II) and palladium(II) complexes of the general type [MCl2{Ph2P(CH2)nPPh2}] with n = 2, 3 and M = Ni (2, 3), Pd (4, 5) have been utilized as catalysts for the polymerization reaction of norbornene. It was found that the use of B(C6F5)3/triethylaluminium (TEA) in comparison to methylaluminoxane as an activator towards complexes 2, 3 and 5 gave comparable polymerization activities, and the system 4/B(C6F5)3/TEA even led to an extremely high polymerization activity of 107 gpolymer/molmetal· h.
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Lassahn et al. (2002) studied this question.