The pyrido-, pyrimidino-, and amidino-sulphimides (1)–(3) react with nitrile oxides at room temperature to give the s-triazolo-N-oxides (4)–(6); the N-oxide (5c) undergoes a reversible, degenerate valence tautomerism at 90–110°.
T. L. Gilchrist, C. J. Harris, C. J. Moody and C. W. Rees, J. Chem. Soc., Chem. Commun., 1974, 486 DOI: 10.1039/C39740000486
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