Patent ID: 6211108
Filing Date: 2001-04-03
Classification: C07C,C07F,C08F,Y10S

Abstract:
A metallocene compound of formula (I)(YR.sub.p).sub.q (Cp)(Cp')MX.sub.2 (I)wherein Cp is a group selected from those of formula (II) and (III): ##STR7##wherein m and n, same or different from each other are integers from 2 to 6;Cp' is a group selected from those of formula (II), (III)wherein (YR.sub.p).sub.q is a divalent group which bridges the two groups Cp and Cp', Y being selected indifferently from C, Si, Ge, N and P; p is 1 when Y is N or P, and is 2 when Y is C, Si or Ge;q is 0, 1, 2 or 3;M is a transition metal selected from Ti, Zr or Hf;the substituents X, same or different from each other, are halogen atoms, --OH, --SH, R, --OR, --SR, --NR.sub.2 or --PR.sub.2 ;the substituents R, same or different from each other, are hydrogen atoms, C.sub.1 -C.sub.20 alkyl radicals, C.sub.3 -C.sub.20 cycloalkyl radicals, C.sub.2 -C.sub.20 alkenyl radicals, C.sub.6 -C.sub.20 aryl radicals, C.sub.7 -C.sub.20 alkylaryl radicals or C.sub.7 -C.sub.20 arylalkyl radicals, optionally containing Si or Ge atoms and, additionally, two adjacent R substituents on Cp or Cp' may form a C.sub.5 -C.sub.8 cycle and, further, two R substituents of the same YR.sub.2 group or of two adjacent YR.sub.2 groups may form a ring comprising from 3 to 8 atoms; when q=0, the R' substituents are defined as the R substituents while, when q=1,2, or 3, the R' substitutents on the on the Cp and Cp' groups are replaced by the divalent group (YR.sub.p).sub.q which bridges the two groups Cp and Cp', with the proviso that when Cp and Cp' are octahydrofluorenyl groups, q is different from 0.