1,1'-Thiocarbonyldiimidazole → 3-(Imidazol-1-yl)-7-nitro-4H-1,2,4-benzothiadiazine 1,1-dioxide imidazolium salt

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Reaction Steps

To a hot solution of 2-amino-5-nitrobenzenesulfonamide (5 g) in dioxane (150 mL) was added thiocarbonyidiimidazole (14 g) and the reaction mixture was refluxed for 5 h. After cooling, the precipitate of the title compound was collected by filtration, washed with dioxane and dried to give the title compound (yield 5.7 g ); m.p. 246-248° C.

Provenance & Evidence