[OH:1][C:2]1[CH:16]=[C:15]([OH:17])[CH:14]=[CH:13][C:3]=1[C:4]([C:6]1[CH:11]=[CH:10][C:9](Cl)=[CH:8][CH:7]=1)=[O:5].[C:18]1([SH:24])[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.C(=O)([O-])[O-].[K+].[K+].Cl>CN1CCCC1=O>[C:18]1([S:24][C:9]2[CH:10]=[CH:11][C:6]([C:4](=[O:5])[C:3]3[CH:13]=[CH:14][C:15]([OH:17])=[CH:16][C:2]=3[OH:1])=[CH:7][CH:8]=2)[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1A mixture of 39 g (156 mmol) of 2,4-dihydroxy-4′-chlorobenzophenone, 22.4 g (204 mmol) of thiophenol and 26 g (188 mmol) of potassium carbonate is stirred in 300 ml of N-methyl-2-pyrrolidone for 24 hours at a temperature of 210° C. After cooling the reaction mixture is neutralized with hydrochloric acid (10%) and extracted with 4×250 ml of ethyl acetate. The solution so obtained is washed with water and afterwards with a saturated solution of sodium chloride. The residue which is obtained, after drying over anhydrous magnesium sulfate, filtration and evaporation of the solvent is subjected to chromatography on silica gel (ethyl acetate/hexane 1:5). The product is recrystallized from ethyl acetate/hexane. 21.5 g of the compound are obtained as yellow crystals with a melting point of 117-118° C.
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