反应详情

温度

57.5 °C

3-Acetylpyridine (50 g, 0.41 mol), 47% aqueous HBr solution (106.6 g, 1.5 equivalent amount relative to 3-acetylpyridine) and water (80 ml) were charged in a reaction vessel and the mixture was stirred at 55-60° C. Bromine (135.2 g, 2.05 equivalent amount relative to 3-acetylpyridine) was added dropwise and the mixture was stirred for one more hour. The mixture was cooled to 5° C. under ice-cooling, and filtered to give 146.7 g of the titled compound as crystals (yield 99.0%).

1. stirringthe mixture was stirred for one more hour
2. temperatureThe mixture was cooled to 5° C. under ice-
3. temperaturecooling
4. filtrationfiltered