3-Hydro­xy-6-[(4-hydroxy­phenyl­amino)­methyl­ene]­cyclo­hexa-2,4-dienone and 2-hydroxy-6-[(4-hydroxy­phenyl­amino)­methyl­ene]­cyclo­hexa-2,4-dienone

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The title compounds, both C13H11NO3, exist as the keto–amine tautomers, and the formal hydroxyl H atoms, which display strong intramolecular hydrogen bonds, are located on the N atoms. This is a verification of the preference for the keto–amine tautomeric form in the solid state. The 2-hydroxy isomer has two independent mol­ecules, with the mol­ecules linked by intramolecular N—H…O and O—H…O and intermolecular O—H…O hydrogen bonds into three-dimensional networks.

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270104010832

Publication date: June 1, 2004

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