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0 °C

52.5 g (0.27 mol) of 3-nitrophthalic anhydride were stirred in portions over the course of 30 minutes into 75 ml of concentrated aqueous ammonia at room temperature. The mixture was then cooled to 0° C., after which a precipitate crystallized out and was filtered off with suction. This precipitate was dissolved in 125 ml of water by gently heating, and 25.6 ml of 32% strength hydrochloric acid were rapidly added. The mixture was cooled to 0° C., and the crystals which separated out were filtered off with suction. 45 g of the product were obtained.

1. customafter which a precipitate crystallized out and
2. filtrationwas filtered off with suction
3. dissolutionThis precipitate was dissolved in 125 ml of water
4. temperatureby gently heating
5. addition25.6 ml of 32% strength hydrochloric acid were rapidly added
6. temperatureThe mixture was cooled to 0° C.
7. customthe crystals which separated out
8. filtrationwere filtered off with suction