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The synthesis and characterization of the C 2 v symmetric (dimethylsilanediylbis(9-fluorenyl))zirconium dichloride ( I ) and (dimethylsilanediylbis(9-fluorenyl))zirconium dimethyl ( II ) are reported. The crystal and molecular structure of II has been solved. The catalyst system I /MAO and II /MAO (MAO = methylalumoxane) produce high-molecular-weight atactic polypropylene at relatively high polymerization temperatures ( M̄ w = (1−4) × 10 5 at 50 °C and Al/Zr = 1200) in good yields, providing a practical entry to this novel, elastomeric propylene homopolymer.
Resconi et al. (Tue,) studied this question.