反应详情

温度

70 °C

n-Butyllithium (2.5M solution in hexane; 25 ml) was added under an inert atmosphere to a stirred solution of 4-bromo-3-methylsulphenylbenzotrifluoride (16.4 g) in ether whilst maintaining the temperature below -70° C. The mixture was stirred at 70° C. for 2 hours and then poured onto solid carbon dioxide pellets. The mixture was stirred for 10 minutes and aqueous hydrochloric acid was added. The layers were separated and the aqueous layer was extracted with ether. The combined organic layers were washed with water, dried (anhydrous magnesium sulphate) and filtered. The filtrate was evaporated and the residue was triturated with cyclohexane and filtered to give 2-methylsulphenyl-4-trifluoromethylbenzoic acid (12.4 g) as a white solid, NMR (CDCl3 +DMSO-d6): 2.45 (s,3H), 7.2(d,1H), 7.3(s,1H), 8.0 (d,1H), 10.7-11.1 (bs,1H).

1. temperaturewhilst maintaining the temperature below -70° C
2. stirringThe mixture was stirred for 10 minutes
3. customThe layers were separated
4. extractionthe aqueous layer was extracted with ether
5. washThe combined organic layers were washed with water
6. dry with materialdried (anhydrous magnesium sulphate)
7. filtrationfiltered
8. customThe filtrate was evaporated
9. customthe residue was triturated with cyclohexane
10. filtrationfiltered