Tautomeric forms of 3-formyl-4-hydroxycoumarin arylhydrazones were studied by 1H and 13C NMR spectroscopy, as well as X-ray structural analysis. These compounds were shown to exist primarily in the 4-hydroxycoumarin form both in DMSO solution, as well as in gas phase; the chroman-2,4-dione form was a minor component. According to X-ray structural analysis data, solid 3-formyl-4-hydroxycoumarin phenylhydrazone exists in the 4-hydroxycoumarin form.
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The authors would like to express their gratitude to Candidate of Chemical Sciences O. S. Anisimova for the consultations regarding the interpretation of mass spectra.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1174-1182, August, 2014.
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Lebedev, V.S., Milevskii, B.G., Solov’eva, N.P. et al. Tautomeric Forms of 3-Formyl- 4-Hydroxycoumarin Arylhydrazones. Chem Heterocycl Comp 50, 1081–1089 (2014). https://doi.org/10.1007/s10593-014-1567-3
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DOI: https://doi.org/10.1007/s10593-014-1567-3