[SH:1][CH2:2][C:3]([OH:5])=[O:4].[OH-].[K+].[F:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[C:15]1[CH:20]=[CH:19][C:18]([CH:21](Cl)[CH3:22])=[CH:17][CH:16]=1.C1(C)C=CC=CC=1>CO.O>[F:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[C:15]1[CH:16]=[CH:17][C:18]([CH:21]([S:1][CH2:2][C:3]([OH:5])=[O:4])[CH3:22])=[CH:19][CH:20]=16.35 gm (0.055 mol) of 80% mercaptoacetic acid were admixed in 70 ml of methanol with a solution of 6.2 gm (0.11 mol) of potassium hydroxide in 6.2 ml of water. To the solution of dipotassium salt, 11.7 gm (0.05 mol) of 1-(2'-fluoro-4-biphenylyl)-1-chloro-ethane were added, the reaction mixture was rinsed with 20 ml of methanol and stirred for 18 hours at room temperature. Subsequently, the mixture was evaporated, the residue was digested with acetone, and the precipitated potassium salt was suction-filtered off. The free acid was obtained by dissolving the salt in water and acidifying the solution. M.p 128°-130° C. (from toluene). Yield: 55% of theory.
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