N. Schneider et al., ANSA-METALLOCENE DERIVATIVES .40. ANSA-ZIRCONOCENE COMPLEXES WITH MODIFIED BENZINDENYL LIGANDS - SYNTHESES, CRYSTAL-STRUCTURE, AND PROPERTIES AS PROPENE POLYMERIZATION CATALYSTS, Organometallics, 16(15), 1997, pp. 3413-3420
As modifications of the effective catalyst precursor [dimethylsilanedi
ylbis(benz[e]indenyl)]zirconium dichloride, the ansa-zirconocene compl
exes Me2Si(cyclopenta[c]phenanthryl)(2)ZrCl2, Me2Si(cyclopenta[l]phena
nthryl)(2)ZrCl2, Me2Si(2-methylcyclopenta[l]phenanthryl)(2)ZrCl2, and
Me2Si(2-methyltetrahydrobenz[e]indenyl)2 have been synthesized. When a
ctivated by methylaluminoxane (MAO), these complexes give highly activ
e catalysts for the polymerization of propene to polymers with high is
otacticities and molecular weights.