2,3-Dihydroazete 1-oxides (3b–e), the first examples of crystalline, ‘stable’, four-membered cyclic nitrones, are formed by reaction of 1-nitroalkenes with ynamines, and other products are 3-nitrocyclobutenes; the structure of the cyclic nitrone (3b) has been determined by X-ray crystallography.
A. D. de Wit, M. L. M. Pennings, W. P. Trompenaars, D. N. Reinhoudt, S. Harkema and O. Nevestveit, J. Chem. Soc., Chem. Commun., 1979, 993 DOI: 10.1039/C39790000993
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