1,2,5-Thiadiazole, previously thought to be resistant to electrophilic substitution, has been shown to undergo chloromethylation; N-chlorosuccinimide is more selective than N-bromosuccinimide in the dihalogenation of 3,4-dimethyl-1,2,5-thiadiazole.
R. F. Cookson and A. C. Richards, J. Chem. Soc., Chem. Commun., 1974, 585 DOI: 10.1039/C39740000585
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