[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[CH:13]=[CH:12][C:11]([CH:14]([S:16]([CH2:18][C:19]([OH:21])=[O:20])=[O:17])[CH3:15])=[CH:10][CH:9]=1.[C:22](=O)([O-])[O-].[K+].[K+].CI>CS(C)=O.O.Cl>[CH3:22][O:20][C:19](=[O:21])[CH2:18][S:16]([CH:14]([C:11]1[CH:12]=[CH:13][C:8]([C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=2[F:1])=[CH:9][CH:10]=1)[CH3:15])=[O:17]3 gm (10 millimols) of [1-(2'-fluoro-4-biphenylyl)-ethylsulfinyl]-acetic acid, m.p. 164°-165° C., were dissolved in 15 ml of dimethyl sulfoxide, 2 gm of potassium carbonate and 1.5 ml of methyl iodide were added, and the mixture was stirred at room temperature for one hour. Subsequently, the mixture was diluted with water, hydrochloric acid was added and the reaction product was extracted with ethyl acetate. After washing, drying and evaporating the extract, the residue was recrystallized from isopropanol (10 ml). Yield: 1.4 gm (44% of theory); m.p. 79° C.
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