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In a reactor, 15 g of chlorobenzene and 15 g of water were charged, and 12.7 g (0.05 mole) of 4-(4-trifluoromethylphenoxy)phenol, 15.8 g (0.055 mole) of ethyl 3,4-dibromopentanoate and 8.7 g (0.063 mole) of potassium carbonate and 0.3 g (0.001 mole) of tributylethylammonium bromide were added. They were refluxed for 6 hours to react them. The water phase was separated and the organic phase was washed with 5% hydrochloric acid and with water and then, chlorobenzene, ethyl 3,4-dibromopentanoate and low boiling by-products were distilled off at 100° C. under a reduced pressure (0.02-0.05 mmHg) to obtain 18.1 g of ethyl 4-[4-(4-trifluoromethylphenoxy)phenoxy]-2-pentenoate (nD20 1.5175). The yield was 95.1%.

1. temperatureThey were refluxed for 6 hours
2. customto react them
3. customThe water phase was separated
4. washthe organic phase was washed with 5% hydrochloric acid and with water
5. distillationchlorobenzene, ethyl 3,4-dibromopentanoate and low boiling by-products were distilled off at 100° C. under a reduced pressure (0.02-0.05 mmHg)