Cleavage of Ru-3(CO)(12) by N-heterocyclic carbenes: Isolation of cisand trans-Ru(NHC)(2)(CO)(3) and reaction with O-2 to form Ru(NHC)(2)(CO)(2)(CO3)

Reference:

Ellul, C. E., Saker, O., Mahon, M. F., Apperley, D. C. and Whittlesey, M. K., 2008. Cleavage of Ru-3(CO)(12) by N-heterocyclic carbenes: Isolation of cisand trans-Ru(NHC)(2)(CO)(3) and reaction with O-2 to form Ru(NHC)(2)(CO)(2)(CO3). Organometallics, 27 (1), pp. 100-108.

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Abstract

The N-heterocyclic carbenes (NHCs) 1,3-dialkyl-4,5-dimethytimidazol-2-ylidene (alkyl = ethyl, IEt2Me2; isopropyl, (IPr2Me2)-Pr-i) and 1,3-di-isopropylimidazol-2-ylidene ((IPr2)-Pr-i) cleave Ru-3(CO)(12) at room temperature to give the mononuclear complexes Ru(NHC)(2)(CO)(3) (NHC = IEt2Me2 1; (IPr2Me2)-Pr-i 2; (IPr2)-Pr-i, 3). X-ray crystallography reveals that I contains trans-NHC ligands whereas 2 and 3 have an unexpected cis arrangement of carbenes. Exposure of 1-3 to air in the solid state or upon reaction with O-2 in solution yields the carbonato complexes Ru(NHC)(2)(CO)(2)(CO3) (NHC = IEt2Me2 4, (IPrMe2)-Pr-i 5, (IPr2)-Pr-i 6).

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