C(=O)([O-])[O-].[K+].[K+].Br[CH2:8][C:9]1[CH:14]=[C:13]([F:15])[CH:12]=[CH:11][C:10]=1[F:16].[Cl:17][C:18]1[CH:23]=[CH:22][C:21]([SH:24])=[CH:20][CH:19]=1.[Cl-].[NH4+]>CN(C)C=O.O>[Cl:17][C:18]1[CH:23]=[CH:22][C:21]([S:24][CH2:8][C:9]2[CH:14]=[C:13]([F:15])[CH:12]=[CH:11][C:10]=2[F:16])=[CH:20][CH:19]=1
Process 2: After addition of potassium carbonate (4.00 g, 29.0 mmol) and 2-bromomethyl-1,4-difluorobenzene (5.00 g, 24.2 mmol) to a solution of 4-chlorobenzenethiol (3.86 g, 26.6 mmol) in N,N-dimethylformamide (120 ml), the mixture was stirred for 3 hours at room temperature. To the reaction mixture were added saturated ammonium chloride (50 ml) and water (20 ml), followed by extraction with diethyl ether. The extracts were combined, washed with water and brine, dried over MgSO4, and concentrated. The residue thus obtained was purified by chromatography on a silica gel column (1% ethyl acetate-hexane), whereby the title compound (6.41 g, 98%) was obtained as a colorless oil.
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