| 摘要 |
PURPOSE: Metallocene compounds of formula (I) are new and can be used as catalysts for the (co)polymerization of olefins, i-olefins, alkines and/or diolefins or for ring-opening polyaddition. CONSTITUTION: Metallocene compounds of formula (I) in which: CpI and CpII represent carbanions with a structure containing cyclopentadienyl; D represents a donator atom and A is an acceptor atom, D and A being linked by a reversible, coordinate bond such that the donator group adopts a positive (partial) charge and the acceptor group a negative (partial) charge; M stands for a transitional metal of the IIIrd, IVth, Vth or VIth subgroup of the periodic system of elements (Mendeleev's table) including lanthanides and actinoides; X stands for an anion equivalent; and n, depending on the charge of M, stands for the figure nought, one, two, three or four.
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