[CH3:1][N:2]([CH3:5])[CH:3]=O.[NH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH3:14])=[CH:9][C:8]=1[S:15]([OH:18])(=O)=[O:16].S(Cl)([Cl:21])=O>C1(C)C=CC=CC=1>[Cl-:21].[Cl:21][S:15]([C:8]1[CH:9]=[C:10]([O:13][CH3:14])[CH:11]=[CH:12][C:7]=1[NH:6][CH:3]=[N+:2]([CH3:5])[CH3:1])(=[O:18])=[O:16]Dimethylformamide (0.152 mol) is added dropwise to a suspension of 2-amino-5-methoxybenzenesulphonic acid (0.152 mol) in thionyl chloride (0.763 mol). The reaction mixture is heated very gradually to 70° C. and is maintained at that temperature for 1.5 hours. After cooling, the stirred reaction solution is treated by the addition of 20 ml of toluene. A precipitate is formed which is rapidly filtered off, rinsed with toluene and then dried at 40° C. in vacuo in the presence of KOH pellets, to yield the title product.
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