Abstract
N-heterocyclic carbene (NHC) complexes of rhodium(I) ( 3 and 4) bearing one diether (MeOCH 2CH 2OCH 2CH 2–NHC) functionality on N 1 and bulky benzyl groups (CH 2–C 6H 2(CH 3) 3-2,4,6 and CH 2–C 6(CH 3) 5) on N 3 of (5,6-dimethyl)benzimidazole were synthesized by deprotonation of the corresponding benzimidazolium salt with [Rh(μ-OMe)(1,5-cod)] 2 in dichloromethane at ambient temperature. All compounds have been fully characterized by elemental analysis, 1H and 13C NMR spectroscopy. X-ray diffraction studies on single crystals of 3a and 3b confirm the cis square planar geometry. All of the new benzimidazol-2-ylidene rhodium(I) complexes were found to be effective catalysts for the transfer hydrogenation reaction.
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