| abstract |
Complexes of metal-cobalt carbonyl moiety represented by the empirical formula, (Xy n(A)zM(Co(CO)4)n), wherein, for example, X is bromine, A is tetrahydrofuran, M is tin, y is 4, z is an average number of 0.5 to 1, and n is 2 are provided by reacting lower metal halide such as tin dibromide with octacarbonyldicobalt in the presence of tetrahydrofuran. The complexes are useful catalysts in the polymerization of olefins such as norbornadiene. |