organic compounds
In the title compound, 4-chloro-3-nitro-2H-chromen-2-one, C9H4ClNO4, the coumarin core has a planar conformation. The Cl atom accepts one of the bifurcated lone pairs of the keto O atom with sp2 hybridization state. The other lone pair is donated to the pyran ring of a neighboring molecule.
organic compounds
Open access
In the title compound, C12H15Cl2NO, the piperidine ring adopts a chair conformation. An intramolecular O—HN hydrogen bond is observed. The packing of the molecules in the crystal structure is stabilized by π–π interactions and ClCl contacts.