| 摘要 |
Metallocene compounds of formula (I) in which: CpI and CpII represent carbanions with a structure containing cyclopentadienyl; D represent a donator atom and A an acceptor atom, D and A being linked by a reversible, coordinative 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. These compounds are new and can be used as catalysts for the (co)polymerisation of olefins, i-olefins, alkines and/or diolefins or for ring-opening polyaddition. A typical x-ray structural analysis is represented by formula (18a).
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