Expanded-Ring and Backbone-Functionalised N-Heterocyclic Carbenes (pages 1604–1607)
Manuel Iglesias, Dirk J. Beetstra, Kingsley J. Cavell, Athanasia Dervisi, Ian A. Fallis, Benson Kariuki, Ross W. Harrington, William Clegg, Peter N. Horton, Simon J. Coles and Michael B. Hursthouse
Version of Record online: 11 MAR 2010 | DOI: 10.1002/ejic.200901182
Although the direct reaction of the unsaturated amidinium salt 7 with metal precursors results in decomposition, 7 undergoes a facile Diels-Alder cycloaddition with cyclopentadiene to afford a sterically encumbered amidine salt from which RhI complexes may be prepared. Thus, in a short versatile synthesis, it is possible to prepare sterically crowded NHC complexes bearing a peripheral alkene functionality.