N-p-Tolyl and N-phenylketenimines (1) react with thiobenzophenones (2) by a formal 4+ 2 cycloaddition to give substituted 4H-3,1-benzothiazines (4) whose structures have been confirmed by an X-ray diffraction study, whereas the N-mesitylketenimine (5) leads to the 2-iminothietan (6) by a 2 + 2 cycloaddition.
A. Dondoni, A. Battaglia, P. Giorgianni, G. Gilli and M. Sacerdoti, J. Chem. Soc., Chem. Commun., 1977, 43 DOI: 10.1039/C39770000043
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