Diazotisation of the benzothiazathiolium salts isolated from the reaction of sulphur monochloride with aromatic amines (Herz reaction) leads to the formation of 1,2,3-benzothiadiazoles. The scope of the reaction is discussed.
P. Kirby, S. B. Soloway, J. H. Davies and S. B. Webb, J. Chem. Soc. C, 1970, 2250 DOI: 10.1039/J39700002250
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