Sulfuric Acid → 2-(3-Acetylureido)-5-(3-trifluoromethylphenylsulfonyloxy)nitrobenzene

Participants

Reaction Steps

1 ml of concentrated sulfuric acid is added, with stirring, to 60 g of 5-(3-trifluoromethylphenylsulfonyloxy)-2-ureidonitrobenzene in 200 ml of acetic anhydride. A clear solution is initially produced, and the temperature rises to about 40° C. The mixture is stirred for a further four hours, and the precipitate produced is filtered off with suction and washed with diisopropyl ether and petroleum ether, melting point 196° C.

Provenance & Evidence