[F:1][C:2]([F:17])([F:16])[C:3]1[CH:11]=[CH:10][CH:9]=[C:8]([C:12]([F:15])([F:14])[F:13])[C:4]=1[C:5]([OH:7])=[O:6].[OH-].[Na+].S(OC)(O[CH3:24])(=O)=O.C(=O)(O)[O-].[Na+]>O1CCCC1>[F:1][C:2]([F:16])([F:17])[C:3]1[CH:11]=[CH:10][CH:9]=[C:8]([C:12]([F:13])([F:15])[F:14])[C:4]=1[C:5]([O:7][CH3:24])=[O:6]
A solution of 6 g of 2,6-bis-trifluoromethyl-benzoic acid, 60 ml of tetrahydrofuran and 11.58 ml of a 2N sodium hydroxide solution was stirred for 30 minutes at 20° C. and after the reaction medium was cooled to 0° C., 4.26 ml of dimethyl sulfate were added. The mixture was stirred for 1 hour at 20° C. and another 2.1 ml of dimethyl sulfate were added. The reaction mixture was stirred for 24 hours at 20° C. and was then poured into an aqueous solution of sodium bicarbonate, extracted with isopropyl ether, then with ethyl acetate, dried, filtered, rinsed and brought to dryness. After chromatographing on silica (eluant hexane-ethyl acetate (9-1)), 5.59 g of the desired product were obtained.
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