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160 ml of acetic acid, 160 ml of acetic anhydride and 100 g of 1,4-benzodioxane-5-carboxylic acid were introduced into a balloon flask provided with an agitator and a thermometer. The mixture was heated and a solution of 40 ml of nitric acid in 40 ml of acetic acid was added. The mixture was agitated at 40°-45° C. and then cooled. The crystals were dried off, washed and dried. 34 g of 7-nitro-1,4-benzodioxane-5-carboxylic acid were obtained (M.P.: 246° C.; yield: 27%).

1. customprovided with an agitator
2. temperatureThe mixture was heated
3. temperaturecooled
4. customThe crystals were dried off
5. washwashed
6. customdried