7309. 1-Phenyl-3-pyrazolidinone

Nomenclature

CAS number: 92-43-3
1-Phenyl-3-pyrazolidone; Phenidone.
C9H10N2O; mol wt 162.19.
C 66.65%, H 6.21%, N 17.27%, O 9.86%.

Description and references

Prepd by heating phenylhydrazine with β-chloropropionic acid: DE 53834 (1889); by acid hydrolysis of 3-amino-1-phenylpyrazoline: Kendall, Duffin, GB 650911 and GB 669591 (1951, 1952, both to Ilford). Review: Kendall, Br. J. Photogr. 100, 56 (1953).

Chemical structure

Properties

Leaflets or needles from benzene, mp 121°. One gram dissolves in 10 ml boiling water, in 10 ml hot alcohol, in 37.5 ml boiling benzene. Practically insol in ether, petr ether. Freely sol in dil aq solns of acids and alkalies. Pharmacological tests indicate low oral toxicity. No cases of dermatitis have occurred.

Use

Non-staining, high contrast photographic developer. The amount required is about one-fifth to one-tenth that of Metol.