Reaction of 1-Aryl-3-methylpyrazol-5-ones with 2-Cyanoaryldiazonium Bisulfates |
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| Authors: | M-G A Shvekhgeimer O A Ushakova V V Nesterov M Yu Antipin |
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| Institution: | (1) Moscow A. N. Kosygin State Textile University, Moscow, 117918, Russia;(2) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, 117813, Russia |
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| Abstract: | 2-Cyanoaryldiazonium bisulfates, obtained by the action of nitrosyl sulfuric acid on isatin 3-hydrazone and its 5-bromo and 5-nitro derivatives, couple with 1-aryl-3-methylpyrazol-5-ones and form 4-arylhydrazones of 1-aryl-3-methylpyrazole-4,5-diones. It was established on the basis of data of IR, UV, and 1H NMR spectra and of X-ray structural analysis that the coupling products exist in the hydrazone form stabilized by an intramolecular hydrogen bond.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 210–215, February, 2005. |
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| Keywords: | 4-arylhydrazones of 1-aryl-3-methylpyrazole-4 5-diones 1-aryl-3-methylpyrazol-5-ones 2-cyanoaryldiazonium bisulfates coupling reaction |
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