In general arylsulphonyl azides with secondary amino-groups as ortho-substituent give thiadiazole dioxides in good yield on pyrolysis in chlorobenzene, while the corresponding carbonyl azides give the expected isocyanates.
J. Martin, O. Meth-Cohn and H. Suschitzky, J. Chem. Soc. D, 1971, 1319 DOI: 10.1039/C29710001319
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