Transition metal–carbon bonds. Part XII. Allylic complexes of ruthenium(II)

Abstract

New allylic complexes of ruthenium(II) of the type [Ru(all)₂(diolefin)](all = allyl or 2-methylallyl; diolefin cyclo-octa-1,5-diene or norbornadiene) are described. The allylic ligands in these complexes are asymmetrically bonded. The complexes react with allyl halides to give halogeno-bridged complexes of the type [Ru₂X₂(all)₂(diolefin)₂](X = Cl or Br). On treatment with triphenylphosphine cyclo-octa-1,5-diene is displaced from [Ru(2-methylallyl)₂C₈H₁₂] giving [Ru(2-methylallyl)₂(PPh₃)₂]. This in turn reacts with carbon monoxide to give [Ru(CO)₃(PPh₃)₂] and 2,5-dimethylhexa-1,5-diene. Nuclear magnetic resonance and far-infrared data are given.