organic compounds
An X-ray diffraction study of the title compound, C13H15NO4, has demonstrated that the formation of intramolecular O—HO=C hydrogen bonds leads to the lengthening of the carbonyl C=O bonds, shortening of the (C=)C—O(—H) bond and delocalization of the electron density within the dihydropyridine ring.
organic compounds
The title compound, C14H13NO5, exhibits a resonance-assisted hydrogen bond O—HO=C [2.505 (4) Å], which leads to a lengthening of the carbonyl C=O bond, a shortening of the C—OH bond and delocalization of the electron density within the dihydropyridine ring.