Patent ID: 6169052
Filing Date: 2001-01-02
Classification: C07F,C08F,Y10S

Abstract:
A compound (metallocene) of The formula XI ##STR14## in which M.sup.1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum, R.sup.14 and R.sup.15 are identical or different and are a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.10 -alkyl group, a C.sub.1 -C.sub.10 -alkoxy group, a C.sub.8 -C.sub.10 -aryl group, a C.sub.6 -C.sub.10 -aryloxy group, a C.sub.2 -C.sub.10 -alkenyl group, a C.sub.7 -C.sub.40 -arylalkyl group, a C.sub.7 -C.sub.40 -alkylaryl group or a C.sub.8 -C.sub.40 -arylalkenyl group, R.sup.16 and R.sup.17 are different and are a fluorenyl ligand and a substituted cyclopentadienyl ligand, R.sup.18 ##STR15## .dbd.BR.sup.19, .dbd.AIR.sup.19, .dbd.NR.sup.19, .dbd.PR.sup.19 or .dbd.P(O)R.sup.19 wherein R.sup.19 is a C.sub.6 -C.sub.10 -aryl group, R.sup.20 and R.sup.21 are identical or different and are a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.10 -alkyl group, a C.sub.1 -C.sub.10 -fluoroalkyl group, a C.sub.6 -C.sub.10 -fluoroaryl group, a C.sub.6 -C.sub.10 -aryl group, a C.sub.1 -C.sub.10 -alkoxy group, a C.sub.2 -C.sub.10 -alkenyl group, a C.sub.7 -C.sub.40 -arylalkyl group, a C.sub.6 -C.sub.40 -arylalkenyl group or a C.sub.7 -C.sub.40 -alkylaryl group, or R.sup.19 and R.sup.20 or R.sup.19 and R.sup.21, in each case with the atoms connecting them, form a ring, and M.sup.2 is silicon, germanium or tin and the metallocene has a C.sub.1 symmetry in the part of the metallocene formed by M.sup.1 and R.sup.16 and R.sup.17.