Abstract
Catalysts derived from nickel complexes containing dithio-β-diketonate and phosphine ligands, and having the general formula Ni[R 1 C(S)CR 2 C(S)R 3 ](PL 1 L 2 L 3 )x (R j , L j = alkyl or aryl, X = halide) are shown to be active and selective in the oligomerization of butenes at room temperature and under autogenous pressure in toluene and chlorobenzene. Conversions of 93% and octene selectivities in excess of 90% are reported. The monomer concentration as a function of time is described by the formula ln(monomer) = A exp(-Bt) + C. No deleterious effect is detected with hydrogen as a co-feed, carbon monoxide is a catalyst inhibitor and dienes are oligomerized by the catalyst system.
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