Pentafluorophenyl derivatives of transition metals. Part V. Bis-(π-cyclopentadienyl)bis-(σ-pentafluorophenyl)zirconium and related studies

Abstract

Treatment of bis-(π-cyclopentadienyl)zirconium dichloride with pentafluorophenyl-lithium affords (π-C₅H₅)₂Zr(σ-C₆F₅)₂, a complex less chemically robust than the titanium analogue, (π-C₅H₅)₂Ti(σ-C₆F₅)₂. Bis-(π-cyclopentadienyl)bis-(σ-pentafluorophenyl)zirconium readily hydrolyses, giving (π-C₅H₅)₂Zr(σ-C₆F₅)OH, and ultimately (π-C₅H₅)₂Zr(OH)₂. Further studies on the titanium compound, (π-C₅H₅)₂Ti(σ-C₆F₅)₂, have shown that the C₆F₅ groups are cleaved by methyl-lithium or by the sodium salt of methanethiol. The latter reagent affords (π-C₅H₅)₂Ti(SCH₃)₂, and similar compounds from dithiols have been prepared. The synthesis of pentacarbonyl(pentafluorobenzoyl)-manganese is also described.