Nickel(II) complexes of ligands of the type Ar 2 PCH 2 PAr 2 and 1,2-Ar 2 PC 6 H 4 PAr 2 (Ar = ortho-substituted phenyl) are active catalysts for polymerization and oligomerization of ethylene.
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Dennett et al. (2004) studied this question.
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