Gary M. Diamond

New mono- and bi-nuclear ansa-metallocenes of zirconium and hafnium as catalysts for the polymerisation of ethene and propene

The new ansa-metallocenes [M{Me2C(η-C5H4)(η2-C9H6)}(η-C5H5)Cl][M = Zr (crystal structure) or, Hf], [M{(CH2)5C(η-C5H4)(η2-C9H6)}(η-C5H5)Cl]·0.5C6H5Me [M = Zr (crystal structure) or Hf], [Zr{Me2C(η-C5H4)(η3-C13H8)}(η-C5H5)Cl](crystal structure), [M{Me2C(η-C5H4)2}(η-C5H5)Cl][M = Zr or Hf (crystal structures)], [X2(η-C5H5)M{C5H4(CMe2)C9H6)}M*(η-C5H5)X 2}](X = Cl, M, M*= Zr, Zr; Hf, Hf; Zr, Hf; or Hf, Zr; X = Me, M, M*= Zr, Zr; Zr, Hf; Hf, Zr; or Hf, Hf), [Cl2(η-C5H5)Zr{C5H4(CMe 2)C9H6}Zr(η-C5Me5)Cl2], [{M(C5H4CMe2C9H7)}(η-C5H5)Cl2](M = Zr or Hf) and [Zr{C5H4CMe2(C9H7}(η-C 5H5)Me2] have been prepared and characterised. The activity of the metallocenes as cocatalysts for the polymerisation of ethene and propene has been evaluated.