Abstract
Oxidative Coupling of CH‐acid Compounds with p‐Phenylene Diamines. III. Reactivity of 4‐Substituted 3‐Methyl‐1‐phenyl‐pyrazolin‐5‐ones with N,N‐Diethyl‐quinone‐(1,4)‐diimineSubstitution products 2–28 of 3‐methyl‐1‐phenyl‐pyrazolin‐5‐one 1, with a wide variety of substituents in the 4‐position, were synthesized. Most of these compounds react with N,N‐diethyl‐quinone‐(1,4)‐diimine by elimination of the substituent giving the same azomethine dye as that formed by oxidative coupling of the 4‐unsubstituted compound. A study of the influence of side reactions by measurement of dye yields has been undertaken.
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