Studies of bis-π-cyclopentadienyl-molybdenum and -tungsten complexes containing sulphur- and oxygen-bonded ligands

Abstract

The preparation of the complexes (π-C₅H₅)₂ML₂(M = Mo or W; L = SMe, SEt, OCOCF₃, or OCOPh, or L₂= S[CH₂]₂S, S[CH₂]₃S, SCH₂·CO₂, or SCHMeCO₂, is described. The 1,2-dithioethane derivative of tungsten reacts with methyl iodide, benzyl chloride, allyl bromide, and mercuric chloride forming S-substituted derivatives, [(π-C₅H₅)₂W(–SCH₂·CH₂·SR–)]⁺X^–. The complex (π-C₅H₅)₂Mo(SMe)₂ reacts with methyl iodide forming the mixed complex [(π-C₅H₅)₂MoSMe₂I]⁺I^–. All the complexes are fully characterised by analysis, i.r. and ¹H n.m.r. spectra and, in some cases, mass spectra.