[F:1][C:2]([F:18])([F:17])[C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([CH3:9])[C:4]=1[S:10]([O:13]C(C)C)(=[O:12])=[O:11].[OH-].[Na+:20]>O1CCCC1.O>[F:18][C:2]([F:1])([F:17])[C:3]1[CH:8]=[CH:7][CH:6]=[C:5]([CH3:9])[C:4]=1[S:10]([O-:13])(=[O:11])=[O:12].[Na+:20]A solution of 83 g of the crude isopropyl 2-trifluoromethyl-6-methylbenzenesulfonate (which contained about 10% of isopropyl 2-trifluoromethylbenzenesulfonate) in 300 mL of tetrahydrofuran was treated with a solution of 24.8 g of 50% aqueous sodium hydroxide in 150 mL of water and heated to reflux for 4 hours, then stirred at room temperature overnight. The mixture was assayed by capillary GC (10 m DB-1, 100°-250° C. at 20° C./min) to ascertain that the isopropyl 2-trifluoromethyl-6-methylbenzenesulfonate was consumed. The tetrahydrofuran was removed in vacuo, then the remainder was poured into 100 mL of water and 200 mL of hexane. The aqueous phase was washed with hexane, then the water removed in vacuo to yield 71 g sodium 2-trifluoromethyl-6-methylbenzenesulfonate as a white solid.
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