Phenidone

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Phenidone

the trademark for l-phenyl-3-pyrazolidone, a compound occurring as white, yellowish, or grayish acicular crystals. The structural formula is

Phenidone has a melting point of 121°C (according to other data, 118°–122°C); 1 g of the compound dissolves in 10 cm³ of either boiling water or hot alcohol. Phenidone is soluble in dilute acids and dilute solutions of alkalies, but it is insoluble in benzene. The compound is a strong reducing agent.

Phenidone is obtained through the condensation of phenylhydrazine with β-halopropionic acid. It is used in photography as a developing agent, usually in a mixture with developers.

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