Synthesis of heterobinuclear metallocenes containing bridging ansa-bis-η-cyclopentadienyl ligands †

Abstract

Binuclear metallocene derivatives have been prepared, exemplified by [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)CMe₂(η-C₉H₆)}Rh(CO)₂], [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)CMe₂(η-C₉H₆)}Rh(PPh₃)₂], [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)CMe₂(η-C₉H₆)}Mn(CO)₃], [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)CMe₂(η-C₉H₆)}Ru(CO)(η-C₄H₇)], [Fe{µ-(η-C₅H₄)CMe₂(η-C₉H₆)Zr(η-C₅H₅)Cl₂], [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)CMe₂(η-C₉H₆)}Co(η-C₅Me₅)], [Cl₂(η-C₅H₅)Zr{µ-(η-C₅H₄)C(CH₂)₅(η-C₉H₆)}Zr(η-C₅H₅)Cl₂], [Cl₂(η-C₅H₅)Hf{µ-(η-C₅H₄)(CH₂)₅C(η-C₉H₆)}Hf(η-C₅H₅)Cl₂]. The tris-η-cyclopentadienyl compounds [Zr{Me₂C(η-C₅H₄)₂(η-C₅H₄Me)Cl}] and the new η-indenyl compound [Zr{(4-Bu^tC₆H₉)(η-C₅H₄)(η²-C₉H₆)}(η-C₅H₅)Cl] are also described. The activity of a selection of the binuclear compounds as co-catalysts for ethylene polymerisation has been demonstrated.

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