Ruthenium Carbene Complexes Containing a Triazolidene Cationic Ligand

Reaction of the bis(dihydrogen)ruthenium complex RuH 2 (H 2 ) 2 (PCy 3 ) 2 ( 1 ) with 1 equiv of the dicationic heterocyclic carbene precursor (C 6 H 13 N 3 )(SO 3 CF 3 ) 2 ( 3 ) produces in good yield the hydrido carbene complex [RuH(C 6 H 12 N 3 )(OSO 2 CF 3 )(PCy 3 ) 2 ][SO 3 CF 3 ] ( 4 ). An X-ray structural analysis of 4 confirms the triflate coordination to the metal. NMR data show that, in solution, 4 exists as a mixture of two isomers. By addition of 1 equiv of the dicationic carbene precursor 3 to the dimer [Cp*Ru(μ-OMe)] 2 ( 2 ), the tricationic bis(carbene) complex [Cp*Ru(C 6 H 12 N 3 ) 2 ][SO 3 CF 3 ] 3 ( 7 ) is isolated in moderate yield and has been characterized by an X-ray structural determination and NMR data.