反应详情

A solution of sodium hydroxide (41.6 g) in water was added to a solution of ethyl 2,6-dichloro-4-trifluoromethylbenzoate (96.3 g) in ethanol. The mixture was heated at reflux for 2.5 hours then cooled and evaporated. It was diluted with water and extracted with ether. The aqueous layer was acidified to pH1 and extracted with ether, washed with water, dried (Na2SO4) and filtered. The filtrate was evaporated to dryness and the residue was triturated with n-hexane and filtered to give 2.6-dichloro-4-trifluoromethylbenzoic acid (62.3 g) as a white solid mp 138.5°-139° C.

1. temperatureThe mixture was heated
2. temperatureat reflux for 2.5 hours
3. temperaturethen cooled
4. customevaporated
5. additionIt was diluted with water
6. extractionextracted with ether
7. extractionextracted with ether
8. washwashed with water
9. dry with materialdried (Na2SO4)
10. filtrationfiltered
11. customThe filtrate was evaporated to dryness
12. customthe residue was triturated with n-hexane
13. filtrationfiltered