反应详情

96.6 g of 2,4-dichloro-5-fluoronitrobenzene (0.46 mol) was stirred with 1150 ml of glacial acetate acid containing 9.7 ml of bromine. Then, a solution consisting of 690 ml of concentrated sulfuric acid and 464 ml of water was added thereto. To the resultant was added 67.5 g of potassium bromate seven times (9.65 g each) at 40° C. over around 2 hours. The reaction was ceased after 8 hours. The reacting mixture was slowly poured into 3000 ml of water containing 46.0 g of sodium bisulfite, and kept overnight. The resultant was filtered, and washed with warm water (about 30° C.) from three to four times, and dried to give a primrose crystal of 3-bromo-2,4-dichloro-5-fluoronitrobenzene, 122.1 g (0.423 mol), mp 51-53.5° C., in 91.9% yield.

1. additionwas added
2. waitkept overnight
3. filtrationThe resultant was filtered
4. washwashed with warm water (about 30° C.) from three to four times
5. customdried