反应详情

Sodium dithionite (58 g, 335 mmol) was dissolved in warm water (300 mL) and was added slowly to a solution of 6-bromo-4-fluoro-2-nitrophenol (11.8 g, 50 mmol) in 250 mL of ethanol heated on a steam bath. The reaction mixture turned from deep orange to light yellow. The suspension is diluted with water till a clear yellow solution was obtained. Partial concentration on a rotary evaporator induced crystallization. The mixture was then cooled to room temperature and crystals formed. Filtration and drying afforded the title compound as a white solid (5.04 g, 49% yield). MS 207 (M+H)+

1. temperatureheated on a steam bath
2. customwas obtained
3. concentrationPartial concentration
4. customon a rotary evaporator
5. customcrystallization
6. customcrystals formed
7. filtrationFiltration
8. customdrying