Anils react with chlorosulphonyl isocyanate (CSI) to yield triazinediones, whereas azines produce triazolotriazolones. Other compounds containing carbon–nitrogen double bonds (oximes, hydrazones, amidines, and carbodi-imides) also react with CSI giving synthetically useful results. The cycloaddition of CSI to azides is described.
H. Suschitzky, R. E. Walrond and R. Hull, J. Chem. Soc., Perkin Trans. 1, 1977, 47 DOI: 10.1039/P19770000047
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