Olefin Oligomerization and Isomerization Catalysts. The Preparation, Properties and Catalytic Action of Dithio Nickel(II) Complexes With Chelating Phosphines

Abstract

The syntheses and properties of cationic nickel complexes containing dithio-β-diketonate and chelating bisphosphine ligands of general formula [Ni{R¹C(S)CR²C(S)R³}{(PL¹L²)R(PL³L⁴)}]X(R^j,L^j = alkyl or aryl, R = (CH₂)_n, n = 1-4, X = halide, BPh₄, PF₆, etc.) are described. The compounds are shown to be effective catalysts for the oligomerization and double bond shift isomerization of olefins with a high specificity for dimeric products rich in desirable linear and near linear isomers.