Benzoyl chloride, 3-nitro- → 5-(3-Nitrobenzamido)-3-Trichloromethyl-1,2,4-Thiadiazole

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A solution of 21.8 g (0.1 mole) 5-amino-3-trichloromethyl-1,2,4-thiadiazole and 18.6 g (0.1 mole) 3-nitrobenzoyl chloride in 250 ml xylene was heated at reflux for 20 hours. Unreacted starting amino compound was recovered by cooling the reaction mixture and filtering the resulting precipitate. The filtrate was concentrated in vacuo and the residue recrystallized from xylene. After washing with petroleum ether, 25.4 g (69% yield) of pure product was obtained; m.p. 198° C.

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