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In a reactor, 100 ml of chlorobenzene and 100 ml of water were charged and 95.3 g (0.375 mole) of 4-(4-trifluoromethylphenoxy)phenol, 73.7 g (0.412 mole) of 4-bromo-2-pentenoate, 78.0 g (0.56 mole) of potassium carbonate and 1.1 g (0.00375 mole) of tributylethylammonium bromide were added. The mixture was refluxed with stirring for 6 hours. The reaction mixture was cooled to the room temperature and conc. hydrochloric acid was added to the reaction mixture with stirring to be acidic. The water phase was separated and the organic phase was washed with water and chlorobenzene was distilled off at 100° C. under a reduced pressure of 0.02 to 0.05 mmHg to obtain 4-[4-(4-trifluoromethylphenoxy)phenoxy]-2-pentenoic acid. The yield was 91.2%.

1. temperatureThe mixture was refluxed
2. additionwas added to the reaction mixture
3. stirringwith stirring
4. customThe water phase was separated
5. washthe organic phase was washed with water and chlorobenzene
6. distillationwas distilled off at 100° C. under a reduced pressure of 0.02 to 0.05 mmHg