反应详情

Sodium hydride (1.05 g of 80% powder) was suspended in THF and to this was added a solution of 2.2,2-trifluoroethanol (1.9 g) in THF, followed by a solution of 4-chloro-3-fluoro-2-methylsulphonylbenzoic acid (4 g) in THF. The resultant mixture was stirred for 2 hours and then acidified with 2M HCl. The mixture was extracted with ether, washed with water, dried (anhydrous magnesium sulphate) and filtered. The filtrate was evaporated to dryness yielding 4-chloro-2-methylsulphonyl-3-(2,2,2-trifluoroethoxy)benzoic acid (5.26 g) as a whim solid, NMR (DMSO d6) 2.5(s,3H), 4.8(q,2H), 7.5(d, 1H), 8.0(d, 1H).

1. extractionThe mixture was extracted with ether
2. washwashed with water
3. dry with materialdried (anhydrous magnesium sulphate)
4. filtrationfiltered
5. customThe filtrate was evaporated to dryness