Reaction of 1-ethynylpyrene with cyclopentadienylruthenium complexes

Abstract

Reactions between [RuC1L₁L₂(η⁵-C₅H₅)] (L₁,L₂ = PPh₃, AsPh₃ or SbPh₃) or [RuCl L₂(η⁵-C₅H₅)] [(L₂, = 1,2-bis(diphenylphosphino)ethane (dppe) and 1,2-bis(diphenylphosphino)methane (dppm)]₂ and l-ethynylpyrene [HC₂R, R = pyrene], in the presence of NH₄PF₆, NaBF₄ or NaBPh₄, have given the corresponding cationic η'-vinylidene complexes. These cations are readily deprotonated to give the corresponding η'-ethynyl complexes. They have been characterised on the basis of elemental analyses and spectroscopic (IR, PMR and CMR) studies. The cationic and neutral products have been further treated with methanol and higher alcohols and the resulting products characterised.