反应详情

Lithium hydroxide monohydrate (1.26 g) was added to a solution of methyl mercaptan (0.72 g) in dimethyl formamide. To this mixture was added 4-chloro-3-fluoro-2-(methylsulphonyl)benzoic acid (3.7 g). The mixture was stirred for 2 hours then poured into water and acidified to pH1. It was 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 4-chloro-3-(methylsulphenyl)-2-(methylsulphonyl)benzoic acid (2.26 g) as a white solid, NMR (CDCl3) 2.5(s,3H), 3.45(s,3H), 7.5(d,1H), 7.7(d,1H).

1. extractionIt was extracted with ether
2. washwashed with water
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. customThe filtrate was evaporated to dryness
6. customthe residue was triturated with n-hexane
7. filtrationfiltered