反应详情

1 ml of concentrated sulfuric acid is added, with stirring, to 50.5 g of 5-phenoxysulfonyl-2-ureidonitrobenzene in 250 ml of acetic anhydride. A clear solution is produced, followed rapidly by precipitation. The mixture is stirred for a further two hours, and the solid is filtered off with suction and washed consecutively with glacial acetic acid and diisopropyl ether, melting point 198° C., decomposition.

1. customA clear solution is produced
2. customfollowed rapidly by precipitation
3. filtrationthe solid is filtered off with suction
4. washwashed consecutively with glacial acetic acid and diisopropyl ether, melting point 198° C., decomposition.