[N+:1]([C:4]1[CH:10]=[C:9]([S:11][CH2:12][CH2:13][CH2:14][Cl:15])[CH:8]=[CH:7][C:5]=1[NH2:6])([O-])=O.CO.S(S([O-])=O)([O-])=O.[Na+].[Na+]>O>[NH2:6][C:5]1[CH:7]=[CH:8][C:9]([S:11][CH2:12][CH2:13][CH2:14][Cl:15])=[CH:10][C:4]=1[NH2:1]6 G. of 2-nitro-4-(3-chloropropylthio)aniline is treated in 120 ml. of methanol and 120 ml. of water with 30 g. of sodium hydrosulfite (Na2S2O4) on the steam bath for about 5 minutes. The reaction mixture is concentrated under vacuum and extracted well with chloroform. Evaporation of the dried extract affords 1,2-diamino-4-(3-chloropropylthio)benzene.
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