Phenyl complexes of ruthenium(II): competition between carbonyl substitution and formation of benzoyl complexes, and an X-ray study of a benzoyl complex
Abstract
Complexes [Ru(CO)2(C6H4X-4)Y(PMe2Ph)2](X = H, Y = Cl, l, or O2CMe; X = OMe, Cl, or NMe2, Y = Cl) react with Me3CNC in CHCl3 solution to yield carbonyl substitution products [Ru(CO)(CNCMe3)(C6H4X-4)Y(PMe2Ph)2] and benzoyl complexes [Ru(CO)(CNCMe3)2-(COC6H4X-4)(PMe2Ph)2]+ in proportions which vary widely according to the conditions used and the nature of X and Y. The most probable route to the benzoyl complexes appears to be via intermediates of formula [Ru(CO)(CNCMe3)(COC6H4X-4)Y( PMe2Ph)2]. The structure of [Ru(CO)(CNCMe3)2(COPh)(PMe2Ph)2]I3 has been determined by X-ray crystallography.