反应详情

温度

70 °C

To a solution of 2,4-dichlorobenzoic acid (compound 80, 25.0 g, 131 mmol) in chlorosulfonic acid (100 mL) was added bromine (3.4 mL, 65 mmol) and sulfur (0.20 g, 6.6 mmol). The reaction mixture was stirred at 70° C. overnight and then cooled to ambient temperature. The reaction mixture was poured into iced water. The resulting solid was isolated by filtration and dried in vacuo to yield title compound (32.9 g, 93%) as pale brown solid.

1. temperaturecooled to ambient temperature
2. customThe resulting solid was isolated by filtration
3. customdried in vacuo