[F:1][C:2]([F:17])([F:16])[C:3]1[CH:15]=[CH:14][C:6]2[S:7][C:8]([C:10]([O:12]C)=[O:11])=[CH:9][C:5]=2[CH:4]=1.C(=O)([O-])[O-].[Na+:22].[Na+].O>CO>[F:17][C:2]([F:1])([F:16])[C:3]1[CH:15]=[CH:14][C:6]2[S:7][C:8]([C:10]([O-:12])=[O:11])=[CH:9][C:5]=2[CH:4]=1.[Na+:22]A mixture of 5.00 g of methyl 5-(trifluoromethyl)benzo[b]thiophene-2-carboxylate, 4.00 g of sodium carbonate, 20 ml of water and 60 ml of methanol was stirred at 80° C. for 3 hours. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. The residue was recrystallized from water to obtain 5.10 g of sodium 5-(trifluoromethyl)benzo[b]thiophene-2-carboxylate (hereinafter referred to as “the present compound 5”).
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