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In a solution of 25.0 g of 3,5-dichlorophenyl boric acid in 200 ml of tetrahydrofuran and 100 ml of water, 27.5 g of 2-bromo-3,3,3-trifluoropropene, 38.0 g of potassium carbonate and 1.84 g of dichlorobis(triphenylphosphine) palladium (II) were added, and stirred under reflux with heat for 3 hours. After the completion of the reaction and cooling to room temperature, 500 ml of ice water was added, and extracted with ethyl acetate (500 ml×1). The organic phase was washed with water, dried over anhydrous sodium sulfate, the solvent was distilled off under reduced pressure. The residue was purified with silica gel column chromatography that was eluated with hexane, and 25.7 g of the aimed product was obtained as colorless oily substance.

1. temperatureunder reflux
2. temperaturewith heat for 3 hours
3. customAfter the completion of the reaction
4. extractionextracted with ethyl acetate (500 ml×1)
5. washThe organic phase was washed with water
6. dry with materialdried over anhydrous sodium sulfate
7. distillationthe solvent was distilled off under reduced pressure
8. customThe residue was purified with silica gel column chromatography that