Metal-to-metal transfer of vinyl ligands: ruthenium-catalysed synthesis of vinylmercury compounds
作者:Joseph R. Crook、Barbara Chamberlain、Roger J. Mawby、Fritjof C. F. Körber、Amanda J. Reid、Colin D. Reynolds
DOI:10.1039/dt9920000843
日期:——
Vinyl ligands are readily transferred from ruthenium(II) to mercury(II), giving mono- or di-vinyl mercury complexes, depending on the vinyl ligand and the reaction conditions used. In conjunction with steps involving aryl ligand transfer from mercury to ruthenium and insertion of MeO2CC = CCO2Me into the ruthenium-aryl bond, this constitutes a ruthenium-catalysed route for the conversion of [HgR2] (R = aryl) into [HgC(CO2Me) = C(CO2Me)R}R] and [HgC(CO2Me) = C(CO2Me)R}2], with alkyne insertion as the rate-limiting step. The mechanism of transfer alters according to the nature of the vinyl ligand. Reaction of [Ru(CO)2C(CO2Me) = C(CO2Me)H}Cl(PMe2Ph)2] with HgCl2 does not lead to vinyl transfer: the product was characterized by X-ray crystallography as [activated Ru(CO)2C(CO2Me) = C(COOMe)H}-(PMe2Ph)2][HgCl3].