[I-].[CH3:2][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.CC(C)([O-])C.[K+].[Cl:28][C:29]1[C:30]([F:43])=[C:31]([C:37](=O)[C:38]([F:41])([F:40])[F:39])[CH:32]=[C:33]([Cl:36])[C:34]=1[F:35]>O1CCCC1.CCCCC.O>[Cl:36][C:33]1[CH:32]=[C:31]([C:37]([C:38]([F:41])([F:40])[F:39])=[CH2:2])[C:30]([F:43])=[C:29]([Cl:28])[C:34]=1[F:35]To the suspension of methyl triphenylphosphonium iodide (1.92 g) in tetrahydrofuran (12 ml) was added potassium tert-butoxide (0.53 g) slowly at argon atmosphere below 0° C. on ice/water bath. The reaction mixture turned to yellow and was stirred for 0.5 h. To the mixture was added a solution of 1-(3,5-dichloro-2,4-difluorophenyl)-2,2,2-trifluoroethanone (1.15 g) in tetrahydrofuran (3 ml) dropwise on ice/water bath. After addition, the reaction mixture was warmed to room temperature and stirred over night. The reaction mixture was diluted with pentane and water. The organic phase was separated and washed with water and dried over MgSO4. The crude residue was purified on silica-gel column chromatography (eluent: n-hexane) to give 1,3-dichloro-2,4-difluoro-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene (0.80 g).
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