反应详情

166 g of 7-mercapto-1,4-benzodioxane-5-carboxylic acid, 242 cm3 of water, 216 cm3 of soda lye and 181 g of ethylsulfate were introduced into a balloon flask provided with a condenser. The mixture was heated under reflux and then cooled. The solution was poured into 1.3 l of water, filtered and treated with 110 cm3 of hydrochloric acid. The precipitate was dried off, washed with water and dried. 152 g of 7-ethylthio-1,4-benzodioxane-5-carboxylic acid were obtained (M.P.: 153°-154° C.; yield: 81%).

1. customprovided with a condenser
2. temperatureThe mixture was heated
3. temperatureunder reflux
4. temperaturecooled
5. filtrationfiltered
6. additiontreated with 110 cm3 of hydrochloric acid
7. customThe precipitate was dried off
8. washwashed with water
9. customdried