[C:1](=[S:3])=[S:2].[OH-].[K+].[N+:6]([C:9]1[CH:14]=[C:13]([C:15]([F:18])([F:17])[F:16])[CH:12]=[CH:11][C:10]=1S)([O-])=O.S(S([O-])=O)([O-])=O.[Na+].[Na+].Cl>O.CO>[F:16][C:15]([F:17])([F:18])[C:13]1[CH:12]=[CH:11][C:10]2[S:2][C:1]([SH:3])=[N:6][C:9]=2[CH:14]=1Carbon disulphide (2.28 g, 30 mmol) was added dropwise over a period of 1 minute to a solution of potassium hydroxide (0.33 g, 5.9 mmol) in a mixture of water (2 ml) and methanol (5 ml), and the resulting yellow solution stirred for 5 minutes, followed by the addition of 2-nitro-4-trifluoromethyl thiophenol (1.10 g, 5 mmol). To this mixture was added dropwise over a period of 5 minutes a solution of potassium hydroxide (1.97 g, 35 mmol) and sodium dithionite (3.1 g, 15 mmol) in water (14 ml), so that the temperature did not exceed 40° C. The resultant orange mixture was stirred at 40°-50° C. for 2 hours. The reaction mixture was cooled to 10° C. and slowly acidified to pH 5-6 with concentrated HCl, and the mixture stirred for half an hour at this temperature. The off-white solid was washed with water and air dried to give the product. The yield was 0.81 g (70%).
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