• Title/Summary/Keyword: 3-Phenyl-4-arylazo-5-isoxazolones

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A Study of Azo-Hydrazone Tautomerism in 3-Phenyl-4-arylazo-5-isozaolones by $^H-NMR$ spectra of $^{15}N-labeled$ Compounds and HMO Method

  • Shawali, Ahmad S.;Salkaabi, harifia S.;Abdallah, Magda A.
    • Archives of Pharmacal Research
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    • v.14 no.3
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    • pp.237-241
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    • 1991

  • The tautomerism in 3-phenyl-4-arylazo-5-isoxazolones 1 was examined by $^1H-NMR$ spectra of $^15N-labeled$ compound and by HMO method. Both spectra data $(^1H-NMR\;and\;IR)$ and bonding energies are in support of the assignment of the hydrazone structure to such compounds. It is further shown that intermolecular and intramolecular hydrogen bondings favor the hydrazone tautomer.

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