| 摘要 |
The invention relates to novel .pi.-complex compounds of transitional metals of the formulas (Ia) and (Ib), in which .pi. is a .pi. system, D a donor atom and A an acceptor atom, where D and A are linked to each other by way of a reversible coordinate bond in such a way that the donor group accepts a positive (partial) charge and the acceptor group a negative (partial) charge, the .pi.-system on the one hand and the acceptor and donor groups on the other hand are linked to the transitional metal, M represents a transitional metal of subgroup III, IV, V or VI of the periodic table of elements (Mendeleev), X represents an anion equivalent and n is zero, one, two, three or four, depending on the charge of M and the charge of .pi.. Said new .pi.-complex compounds are suitable for use as catalysts for the (co)-polymerisation of olefins, cyclo-olefins, alkynes, diolefins, vinyl ester and vinyl aromatics.
|
