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|Section2= |Section7= }} Phenidone (1-phenyl-3-pyrazolidinone) is an organic compound that is primarily used as a photographic developer. It has five to ten times the developing power as Metol. It also has low toxicity and, unlike some other developers, does not cause dermatitis upon skin contact.〔''Merck Index of Chemicals and Drugs, 9th ed.'' monograph 7115〕 Phenidone is Ilford's trademark for this material, which was first prepared in 1890. It was not until 1940 that J. D. Kendall, in the laboratories of Ilford Limited, discovered the reducing properties of this compound. Large scale production did not become feasible until 1951.〔Karlheinz Keller et al. "Photography" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. 〕 Phenidone functions as a reducing agent. It converts to the N-phenyl-hydroxypyrazole: ==Preparation== Phenidone can be prepared by heating phenyl hydrazine with 3-chloropropanoic acid.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phenidone」の詳細全文を読む スポンサード リンク
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