[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[SH:8].[OH:9][C:10]1[CH:18]=[CH:17][C:13]([C:14](O)=O)=[CH:12][C:11]=1[N+:19]([O-:21])=[O:20].O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O.CS(O)(=O)=O.C(=O)(O)[O-].[Na+].[OH-].[Na+]>>[S:8]1[C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=2[N:1]=[C:14]1[C:13]1[CH:17]=[CH:18][C:10]([OH:9])=[C:11]([N+:19]([O-:21])=[O:20])[CH:12]=1A mixture of 14.8 g 2-aminothiophenol, 21.6 g 4-hydroxy-3-nitrobenzoic acid, 18 g phosphorus pentoxide and 180 g methanesulfonic acid was heated at 90° C. for 10 hours. The reaction mixture was brought to pH 5 by addition of sodium bicarbonate and sodium hydroxide solutions, and the solid product collected. The latter was recrystallized first from ethyl acetate and then from acetonitrile to give 6.5 g of the above-indicated product, orange-brown needles, m.p. 214-215° C.
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