| 摘要 |
<p>A class of metallocene compounds is disclosed having the following general formula (I): Rn(Cp)(A)MLp wherein Rn is a structural bridge; Cp is a heterocyclic cyclopentadienyl group of formula (II) wherein R?1 and R2¿ are hydrogen or hydrocarbon groups; M is a transition metal of group 3, 4, 5 or 6 or to the lanthanides or the actinides in the Periodic Table or the Elements (new IUPAC version); L is a monoanionic ligand; Z is NR3 or O; X and Y are selected from (CR42)n, BR42, PR4, SiR42 or GeR42; and substituents R4 are hydrogen atoms or hydrocarbon radicals, with the proviso that both X and Y cannot be carbon atoms at the same time; A is a group selected from substituted or unsubstituted cyclopentadienyls, which may carry one or more condensed cycles, =NR5, -O-, -S- and =PR5 groups, R5 being defined as substituents R?1 and R2¿, and groups corresponding to formula (II); p is an integer from 0 to 3. These metallocene compounds are useful as catalyst components for the polymerization of olefins.</p> |
