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Neutral nickel(II) complexes [[R–NP]NiPh(PPh3)](1, R = H; 2, R = CH3) bearing P,N‐chelate ligands ([H–NP] = (2‐diphenylphosphanyl)benzenamine L1; [CH3–NP] = (2‐diphenylphosphanyl) N‐methylbenzenamine L2) have been synthesized and characterized. The molecular structure of complex 1 has been confirmed by single‐crystal X‐ray analyses. Afteractivation with methylaluminoxane (MAO), catalytic precursors 1 and 2 could polymerize norbornene to afford addition‐type polynorbornene (PNB) with very high activities (4.43 × 107 g‐PNB mol–1‐Ni h–1), high molecular weight Mw (3.07 × 106 g mol–1) and moderate molecular weight distribution Mw/Mn. Catalytic activities, polymer yield, Mw and Mw/Mn of PNB have been investigated under various reaction conditions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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Wang et al. (2005) studied this question.
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