7022. Parabanic Acid

Nomenclature

CAS number: 120-89-8
Imidazolidinetrione; imidazoletrione; oxalylurea.
C3H2N2O3; mol wt 114.06.
C 31.59%, H 1.77%, N 24.56%, O 42.08%.

Description and references

Prepd by the condensation of urea with diethyl oxalate in a methanol soln of sodium methoxide: Murray, Org. Synth. 37, 71 (1957).

Chemical structure

Properties

Crystals, mp about 230°; also stated as 243° with decomposition. Sublimes at 100°. Soluble in about 20 parts water, in alcohol. Its salts are unstable.