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Reactivity of a Bis(N-heterocyclic carbene) with Ruthenium Carbonyl. Synthesis of Mono- and Trinuclear Derivatives and Ligand Modification via C–H Bond Activation

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posted on 10.12.2012, 00:00 by Javier A. Cabeza, Marina Damonte, Enrique Pérez-Carreño
The bis­(N-heterocyclic carbene) 1,1′-dimethyl-3,3′-(o-xylylene)­diimidazol-2,2′-diylidene (MeImCH2C6H4CH2ImMe) reacted with [Ru3(CO)12] at room temperature, in a 3/1 molar ratio, to give the mononuclear derivative [Ru­(κ2C2-MeImCH2C6H4CH2ImMe)­(CO)3] (1), which contains a chelating bis­(NHC) ligand. However, the use of a 1/1 ratio of the reactants led to the trinuclear cluster [Ru3(μ-κ2C2-MeImCH2C6H4CH2ImMe)­(CO)10] (2), which contains an edge-bridging bis­(NHC) ligand and which, upon heating in refluxing THF, underwent a double C­(sp3)–H bond activation process to give the dihydride derivative [Ru3(μ-H)233C3-MeImCC6H4CH2ImMe)­(CO)8] (3).