Catalyst for the dimerization of diolefins using the reductive properties of metal carbonyls
AssigneesSociete Nationale des Petroles d'Aquitaine, Institut Francais du Petroles des Carburants et Lubrifiants
InventorIgor Tkatchenko
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Abstract
The liquid phase dimerization of diolefins is effected by maintaining the diolefins in solution in an inert solvent in contact with a catalyst which is the reaction product of a transition metal carbonyl and a compound which is a transition metal halide or pseudo halide coordinated with groups capable of furnishing three electrons. The dimerization of butadiene to vinyl-4-cyclohexene and cyclooctadiene and the dimerization of C.sub.4 cracked fractions into vinyl-4-cyclohexene are preferred reactions.
Claims13
A catalyst for the dimerization of diolefins which is the reaction product produced by mixing a transition metal carbonyl of the formula M.sup.1 m(CO).sub.n in which M.sup.1 is a transition metal of Groups VIB, VIIB or VIII, m is an integer of 1- 4, and n is an integer of 1- 15, and a halide or pseudo halide of a transition metal of the formula (M.sup.2 L.sub.p X.sub.q).sub.r in which M.sup.2 is a transition metal of Groups VIB, VIIB or VIII, L is nitrosyl or trihaptoallyl, X is selected from the group consisting of halogen, cyanide, sulfocyanide, isocyanate, nitrate, nitrite, sulfate, acetylacetonate and carboxylate, p and q are 1-3, and r is an integer, wherein the molar ratio of carbonyl to halide or pseudo halide is 0.2:1 to 3:1.
Dependencies are inferred from the claim text.