Preparation of succinimide
20 g of succinic acid are dissolved in a small quantity, of water in a basin, and the solution neutralised with ammonia. The solution is boiled to expel excess of ammonia, after which a further 20 g of succinic acid dissolved in water are added.
The solution is evaporated to complete dryness on a water bath; the dry residue is transferred to a retort and heated quickly with a large luminous flame. The sublimate of succinimide is recrystallised from pure acetone. Yield 70%, colourless rhombic plates; m.p. 126° C; b.p. 288° C.
Systematic organic chemistry, by W. M. Cumming, 128, 1937.