[F:1][C:2]([F:6])([F:5])[CH:3]=[CH2:4].C(=O)([O-])[O-].[K+].[K+].[Cl:13][C:14]1[CH:15]=[C:16](B(O)O)[CH:17]=[C:18]([Cl:20])[CH:19]=1>C1COCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[Cl:13][C:14]1[CH:15]=[C:16]([C:3]([C:2]([F:6])([F:5])[F:1])=[CH2:4])[CH:17]=[C:18]([Cl:20])[CH:19]=13,3,3-Trifluoropropene (3.2 g), potassium carbonate (4.6 g) and bis-(triphenylphosphine)-palladium chloride (0.2 g) is added to a solution of 3,5-dichlorophenylboronic acid in THF (20 ml) under nitrogen. After 3 hours at reflux, the reaction is quenched with ethyl acetate (50 ml) and water (50 ml). The organic phase is then extracted with water and with a saturated aqueous solution of NaCl, dried over Na2SO4 and concentrated in vacuo. The crude product is purified on silica gel (35×45 mm) using heptane (150 ml) as eluant to yield 1,3-dichloro-5-(1-trifluoromethyl-vinyl)-benzene (2.7 g), as a colorless oil. MS (HPLC/MS): no ionisation. Retention time: 5.10 min.
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