title: The reactivity of N-heterocyclic carbenes and their precursors with [Ru(3)(CO)(12)].
abstract: The ambient temperature reaction of the N-heterocyclic carbenes (NHCs) 1,3-dimesitylimidazol-2-ylidene (IMes) and 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene (IDipp) with the triruthenium cluster [Ru3(CO)12], in a 3:1 stoichiometric ratio, results in homolytic cleavage of the cluster to quantitatively afford the complexes [Ru(CO)4(NHC)] (1; NHC = IMes, 2; NHC = IDipp). Reaction of the 2-thione or hydrochloride precursors to IMes, i.e. SIMes and IMes.HCl, with the same triruthenium cluster affords the complexes [Ru4(mu4-S)2(CO)9(IMes)2] (3) and [Ru4(mu4-S)(CO)10(IMes)2] (4) (3:1 and 2:1 reaction), and [{Ru(mu-Cl)(CO)2(IMes)}2] (7) (3:1 reaction) respectively. By contrast, the complex [Ru3(mu3-S)2(CO)7(IMeMe)2] (6), where IMeMe is 1,3,4,5-tetramethylimidazol-2-ylidene, is the sole product of the 2:1 stoichiometric reaction of SIMeMe with [Ru3(CO)12]. Compounds 1-4, 6 and 7 have been structurally characterised by single crystal X-ray diffraction.
authors.affiliation: School of Chemistry and Physics, University of Adelaide, Adelaide, South Australia 5005, Australia.
authors.forename: Michael I
authors.initials: MI
authors.lastname: Bruce
authors.forename: Marcus L
authors.initials: ML
authors.lastname: Cole
authors.forename: Ricky S C
authors.initials: RS
authors.lastname: Fung
authors.forename: Craig M
authors.initials: CM
authors.lastname: Forsyth
authors.forename: Matthias
authors.initials: M
authors.lastname: Hilder
authors.forename: Peter C
authors.initials: PC
authors.lastname: Junk
authors.forename: Kristina
authors.initials: K
authors.lastname: Konstas