反应详情

温度

5 °C

A solution of sodium nitrite (11.2 g) in concentrated sulphuric acid was added to a stirred cooled suspension of 4-bromo-2-fluoro-3-trifluoromethylaniline (40 g) in glacial acetic acid while maintaining the temperature below 5° C. The mixture was stirred at 5° C. for one and a half hours. The resultant mixture was added gradually to a mixture of dimethyl disulphide (20 ml) and copper power (0.224 g) in glacial acetic acid at 45° C. It was stirred and heated at 70° C. for 3 hours. It was cooled, poured into water, extracted with ether, washed with water, dried (MgSO4) and filtered. The filtrate was evaporated to dryness and purified by column chromatography eluted with petroleum spirit (b.p. 60°-80° C.) to give 6-bromo-2-fluoro-3-(methylsulphenyl)benzotrifluoride (30.6 g) as an orange oil NMR (CDCl3) 2.45(s,3H), 7.25(t,1H), 7.5(d,1H).

1. temperaturecooled
2. temperaturewhile maintaining the temperature below 5° C
3. stirringIt was stirred
4. temperatureheated at 70° C. for 3 hours
5. temperatureIt was cooled
6. extractionextracted with ether
7. washwashed with water
8. dry with materialdried (MgSO4)
9. filtrationfiltered
10. customThe filtrate was evaporated to dryness
11. custompurified by column chromatography
12. washeluted with petroleum spirit (b.p. 60°-80° C.)