Cl[C:2]1[C:6]2[C:7]([Cl:11])=[CH:8][CH:9]=[CH:10][C:5]=2[S:4](=[O:13])(=[O:12])[N:3]=1.[NH3:14]>>[NH2:14][C:2]1[C:6]2[C:7]([Cl:11])=[CH:8][CH:9]=[CH:10][C:5]=2[S:4](=[O:13])(=[O:12])[N:3]=14.72 g of 3,4-dichlorobenzo[d]isothiazole-1,1-dioxide were added to 15 ml of 25% ammonia in 15 ml of ice water. After stirring at room temperature for two hours, the desired product was sucked off and dried; yield 4.20 g; melting-point 260° C.
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