The research demonstrates the use of novel ligands to enhance ethylene polymerization activity in nickel and palladium catalysts.
The α-diimine ligand ArN C(Me)C(Me) NAr (Ar = 2,6-C 6 H 3 - i Pr 2 ) reacts with Pd(OAc) 2 in the presence of HBF 4 ·Et 2 O, or [Pd(MeCN) 4 ](BF 4 ) 2 in the absence of acid, to give ethylene polymerization catalysts. The reactions of a related β-diimine ligand with [Pd(MeCN) 4 ](BF 4 ) 2 and (1,2-dimethoxyethane)NiBr 2, and the polymerization activity of catalysts derived from it, are discussed.
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Feldman et al. (1997) studied this question.
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