Acta Cryst. (2002). E58, o254-o256  [ doi:10.1107/S1600536801021857 ]

1-Ethyl-4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid

S. V. Shishkina, O. V. Shishkin, I. V. Ukrainets, A. N. Dakkah and L. V. Sidorenko

Abstract: An X-ray diffraction study of the title compound, C₁₂H₁₁NO₄, has shown that this compound exists in the crystal as the 2-oxo-4-hydroxy tautomer. The formation of two O-HO=C-type intramolecular hydrogen bonds leads to the elongation of both exocyclic and carboxylic C=O double bonds involved in the hydrogen bonding, causes shortening of the exocyclic C-O single bond, and also affects the C-C bond lengths in the dihydropyridine ring.

Online 8 February 2002

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