Abstract
4-Arylhydrazones of l-aryl-3-methylpyrazote-4,5-diones are usually obtained by coupling l-aryl-3methyl-5-pyrazolones with aryldiazonium salts [I]. The common method for the synthesis of the latter is the diazotization of primary aromatic amines. This method is often restricted by the multistage and complicated syntheses of the initial amines ArNH,. This applies in particular to the derivatives of aniline containing a CN group at the orthv position and particularly with other substituents, We showed that the reaction of the readily obtainable hydrazones 2 with nitrosylsulfuric acid in acetic acid can be used for the production of such aryldiazonium salts 1 12]:
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