3,5-Dinitrobenzoyl chloride → 5-(3,5-Dinitrobenzamido)-3-Trichloromethyl-1,2,4-Thiadiazole

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A solution of 10.9 g (0.05 mole) 5-amino-3-trichloromethyl-1,2,4-thiadiazole and 12.6 g (0.055 mole) 3,5-dinitrobenzoyl chloride in 200 ml toluene was refluxed for 20 hours. The crude product precipitated from the reaction mixture upon cooling to -10° C. After isolation by filtration, the residue was washed with hot petroleum ether and finally recrystallized from methylene chloride to give 17.5 g (85% yield) of pure product; m.p. 197° C.

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