An investigation by the M.N.D.O. method shows that the nucleophilicity of a singlet carbene is of less potential value as an energy lowering factor for the barrier to 1,4-addition than 1,2-addition reactions and that neither electrophilic nor nucleophilic singlet carbenes promote the synchronous 1,4-addition reaction over the corresponding 1,2-addition pathways.
W. W. Schoeller and N. Aktekin, J. Chem. Soc., Chem. Commun., 1982, 20 DOI: 10.1039/C39820000020
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