反应详情

4-Chloro-2-fluoroaniline (23 g) was dissolved in conc. sulfuric acid (120 ml), and the resultant mixture was cooled to -20° C., followed by dropwise addition of fuming nitric acid (15 g). The reaction mixture was stirred at -20° to -15° C. for 1.5 hours, poured into ice-water and then extracted with ether. The ether extract was washed with water and a saturated sodium bicarbonate solution, dried and concentrated. The residue was crystallized from a mixture of toluene and hexane (2:1) to obtain 20 g of 4-chloro-2-fluoro-5-nitroaniline. m.p., 83°-84.5° C.

1. extractionextracted with ether
2. extractionThe ether extract
3. washwas washed with water
4. dry with materiala saturated sodium bicarbonate solution, dried
5. concentrationconcentrated
6. customThe residue was crystallized from a mixture of toluene and hexane (2:1)