反应详情

26 ml (262 mmol) of an aqueous solution of sodium hydroxide having a concentration of 10N are added to a solution of 13.4 g (65.7 mmol) of methyl 4-but-2-ynyloxybenzoate diluted in 200 ml of tetrahydrofuran and 25 ml of water. The reaction medium is stirred at reflux for 5 h then at 45° C. for 18 h. The reaction medium is hydrolysed, diluted with ethyl acetate then brought to pH=6 using an aqueous solution of hydrochloric acid having a concentration of 1N. The product is extracted with ethyl acetate. The organic phase is washed with water then with a saturated aqueous solution of sodium chloride, dried over magnesium sulphate, filtered and concentrated. 12.5 g (100%) of 4-but-2-ynyloxybenzoic acid are obtained in the form of a white solid.

1. temperatureat reflux for 5 h
2. extractionThe product is extracted with ethyl acetate
3. washThe organic phase is washed with water
4. dry with materialwith a saturated aqueous solution of sodium chloride, dried over magnesium sulphate
5. filtrationfiltered
6. concentrationconcentrated