| 초록 |
Low-valent bis(imino)pyridyl ruthenium complexes, [η2-N3]Ru(η6-Ar) or {[N3]Ru}2(μ-N2), activate C−H bonds in imidazolium salts to give bis(imino)pyridyl ruthenium−(imidazolidin-2-ylidene) complexes, [N3]Ru(H)-(X)(NHC) (1) (X = halides and tosylate, NHC = N-heterocyclic carbene). In particular, a zwitterionic metal complex of ylidic ligands, bis(imino)pyridyl ruthenium−(2-methyleneimidazoline) complex, 2, was successfully isolated and fully characterized. Complex 2 is the first example of an ylidic transition-metal complex with both NHC and hydride ligands, which was formed through the activation of imidazolium salts. Transition-metal complexes with phosphorus ylides have been used for a variety of reactions, such as polymerization catalysis and study of the catalytic activities of the ylidic ruthenium−NHC complexes in the comparable transformations is currently underway. |
