反应详情

To a mixture of 2-oxo-5-chlorobenzothiazoline (465 g) in conc.sulfuric acid (500 ml) was added dropwise a solution of nitric acid (d=1.42, 275 g) in conc.sulfuric acid (500 ml) with stirring at 10° C. during an hour. After the stirring was continued for an hour under ice-cooling, to the resultant mixture was added ice-water (10 liters) to give crystals, which were separated by filtration, washed with water and dried to give 2-oxo-5-chloro-6-nitrobenzothiazoline (539 g).

1. waitAfter the stirring was continued for an hour under ice-
2. customto give crystals, which
3. customwere separated by filtration
4. washwashed with water
5. customdried