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Unexpected Ring Expansion of an Enantiopure Imidazoline Carbene Ligand

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journal contribution
posted on 06.07.2006, 00:00 by Adela Sánchez Pelegrí, Mark R. J. Elsegood, Vickie McKee, George W. Weaver
We report an unexpected ring expansion reaction of an enantiopure fenchone-derived imidazolinium salt during attempts to form copper complexes of the corresponding imidazoline carbene ligand. A N,N‘-difenchyl piperazinone was formed in low yield together with the difenchyl-substituted five-membered urea.