Title: Allobarbital
CAS Registry Number: 52-43-7
CAS Name: 5,5-Di-2-propenyl-2,4,6(1H,3H,5H)-pyrimidinetrione
Additional Names: 5,5-diallylbarbituric acid; allobarbitone
Molecular Formula: C10H12N2O3
Molecular Weight: 208.21
Percent Composition: C 57.69%, H 5.81%, N 13.45%, O 23.05%
Literature References: Prepn: US 1042265 (1912). Acute toxicity: F. Sandberg, Acta Physiol. Scand. 24, 7 (1951).
Properties: Crystals, leaflets. Slightly bitter taste, mp 171-173°. One part dissolves in about 300 parts water, 50 parts boiling water, 20 parts cold alcohol, 20 parts ether; very sol in hot alcohol and in acetone; sol in ethyl acetate. Insol in aliphatic hydrocarbons. A satd aq soln is acid to litmus. LD50 i.p. in rats: 127.3 mg/kg (Sandberg).
Melting point: mp 171-173°
Toxicity data: LD50 i.p. in rats: 127.3 mg/kg (Sandberg)
NOTE: This is a controlled substance (depressant): 21 CFR, 1308.13.
Therap-Cat: Sedative, hypnotic.
Keywords: Sedative/Hypnotic; Barbituric Acid Derivatives.

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