Synthesis of the WW triply bonded dimers [W2(η-C5H4R)2X4](X = Cl, R = Me or Pri; X = Br, R = Pri) and X-ray crystal structures of [W(η-C5H4Pri)Cl4] and [W2(η-C5H4Pri)2Cl4]

Abstract

The syntheses of the WW triply bonded species [W₂(η-C₅H₄R)₂X₄](X = Cl, R = Me or Prⁱ; X = Br, R = Prⁱ) and of their singly bonded congeners [Mo₂(η-C₅H₄R)₂(µ-X)₄](X = Cl, R = Me or Prⁱ; X = Br, R = Me) are reported along with X-ray crystal-structure determinations of [W(η-C₅H₄Prⁱ)Cl₄] and [W₂(η-C₅H₄Prⁱ)₂Cl₄]. The molecular structure of [W₂(η-C₅H₄Prⁱ)₂Cl₄] consists of two mutually trans W(η-C₅H₄Prⁱ)Cl₂ units linked by an unsupported WW triple bond [WW 2.367 8(6)Å].