Reaction of arylacetylenes with C,N-diarylnitrones is effectively catalysed by copper(I) iodide-dppe [1,2-bis(diphenylphosphino)ethane] in the presence of potassium carbonate to give the corresponding 1-azabut-1-en-3-yne (iminopropyne) derivatives in good yield.
K. Okuro, M. Enna, M. Miura and M. Nomura, J. Chem. Soc., Chem. Commun., 1993, 1107 DOI: 10.1039/C39930001107
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