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Aromaticity and tautomerism-VII1 1 Part VI see M.J. Cook. A.R. Katritzky, A.D. Page, R.D. Tack and H. Witek, Tetrahedron 32,1773 (1976). Empirical resonance energy and conjugation energy of pyrazole and isoxazole from heats of dehydration data

par Chapman, Andrew A.V.;Cook, Michael M.J.;Katritzky, Alan Roy;Aabraham, Michael M.H.;Danil De Namor, Angela A.F.;Dumont, Liliane ;Reisse, Jacques
Référence Tetrahedron, 34, 10, page (1571-1575)
Publication Publié, 1978

Article révisé par les pairs

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Résumé :

The dehydration of various 4,5-dihydro-4- and -5-hydroxy derivatives of pyrazole and isoxazole has been investigated. Heats of dehydration of 4,5-duiydro-4-hydroxy-1,3,5-tripbenylpyrazole and 4,5-dihydro-5-hydroxy-isoxazole are evaluated and used to assess the empirical resonance energy and conjugation energy of pyrazole and isoxazole. The former possesses resonance stabilisation comparable to pyrrole but that of the latter is low. © 1978.