Propylene polymerization of ansa-complexes (RXPh)2C(Cp)(Flu)MCl2 (MÂ =Â Zr or Hf) with halogen substituents on phenyl groups

The catalytic properties of (RXPh)2C(Cp)(Flu)MCl2 complexes (RX = Cl, F or CF3; M = Zr or Hf) in propylene polymerization were studied. The zirconium complex with CF3 substituents showed high activity and produced partially crystalline s-PP.