反应详情

温度

55 °C

670 g of chlorosulfonic acid were introduced into a balloon flask provided with a condenser and a thermometer. 173 g of 1,4-benzodioxane-5-carboxylic acid were added in portions with the temperature being maintained at 5°-10° C. The mixture was heated at 55° C. and then cooled and poured into ice. The precipitate was dried off, washed and dried again. 250 g of 7-chlorosulfonyl-1,4-benzodioxane-5-carboxylic acid were obtained (M.P.: 210°-215° C.; yield: 93.5%).

1. customprovided with a condenser
2. temperaturebeing maintained at 5°-10° C
3. temperaturecooled
4. additionpoured into ice
5. customThe precipitate was dried off
6. washwashed
7. customdried again