反应详情

At room temperature, 18.6 g of tribromomethane is added dropwise to a solution of 10 g of 4-(4-chloroanilinomethyl)phenol, 50 ml of methyl ethyl ketone, 13.8 g of powdery potassium hydroxide in 100 ml of dioxane. The mixture is refluxed under heating for 5 hours and then distilled under reduced pressure to remove the solvent, and water is added to the residue. The solution is washed with ether, thereafter adjusted to pH 4 with 10% hydrochloric acid and extracted with ethyl acetate. The extract is washed with water and dried. The solvent is distilled off from the dried extract under reduced pressure, and the resulting residue is dissolved in an aqueous solution of 2.83 g of sodium bicarbonate in 100 ml of water at 50° C. The solution is washed twice with ethyl acetate. The aqueous layer is separated and adjusted to pH 4 with 10% hydrochloric acid and extracted twice with ethyl acetate. The extract is washed with water and dried. After distilling off the solvent from the dried extract, the residue is washed with diisopropyl ether. The precipitated crystals are collected by filtration to give 4.2 g of 2-{4-(4-chloroanilinomethyl)phenoxy}-2-methylbutyric acid, mp 152° to 153° C.

1. temperatureThe mixture is refluxed
2. temperatureunder heating for 5 hours
3. distillationdistilled under reduced pressure
4. customto remove the solvent, and water
5. additionis added to the residue
6. washThe solution is washed with ether
7. extractionextracted with ethyl acetate
8. washThe extract is washed with water
9. customdried
10. distillationThe solvent is distilled off from the dried
11. extractionextract under reduced pressure
12. dissolutionthe resulting residue is dissolved in an aqueous solution of 2.83 g of sodium bicarbonate in 100 ml of water at 50° C
13. washThe solution is washed twice with ethyl acetate
14. customThe aqueous layer is separated
15. extractionextracted twice with ethyl acetate
16. washThe extract is washed with water
17. customdried
18. distillationAfter distilling off the solvent from the dried
19. extractionextract
20. washthe residue is washed with diisopropyl ether
21. filtrationThe precipitated crystals are collected by filtration