In the title compound, C19H16O3, the dihedral angle between the chromanone moiety and the methoxy phenyl ring is 16.47 (1)°. In the crystal, the molecules are linked by pairs of C—H...O hydrogen bonds, generating R
2
2(14) inversion dimers; further C—H...O hydrogen bonds connect the dimers into [100] double chains.
In the title molecule, C 13 H 17 NO 2 , the piperidine ring assumes a chair conformation. The dihedral angle between the mean plane of the piperidine ring and the benzene ring is 45.49 (1) . In the crystal, molecules are linked by O-HÁ Á ÁO intermolecular hydrogen bonds, leading to a molecular chain running along the c-axis direction. The atoms of the hydroxy piperidine ring and the methyl group of methylphenyl ring are disordered over two sets of sites with refined occupancies of 0.754 (5) and 0.246 (5).
Structure descriptionPiperidine and its derivative have played vital roles in the design of pharmaceutical drugs (Das & Brahmachari, 2013). It has been shown that the antioxidant activity of the title molecule can be enhanced by the substitution of hydroxyl, methoxy, nitro and alkyl groups on the piperidine ring system (Ravindernath & Reddy, 2017).In the compound (Fig. 1)
In the title compound, C20H18Cl4N2O2, the piperdine ring adopts a chair conformation. The dihedral angles between its mean plane and the two benzene rings are 45.5 (3) and 28.0 (3)°, while the benzene rings are inclined to one another by 54.5 (3)°. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains along thea-axis direction. Neighbouring chains are linked by C—H...π interactions, forming double-stranded chains along [100].
The title molecular salt, C18H21N2+·I−, consists of a pyridinium cation and an I−anion. The cation exists in anE,Econformation with respect to the two C=C double bonds, and is roughly planar with the pyridinium ring being inclined to the benzene ring by 10.8 (2) °. In the crystal, the ions are linked by a C—H...I hydrogen bond, and the cations are linked by C—H...π interactions, forming zigzag chains propagating along [010].
In the title compound, C20H19NO2, the (dimethylamino)phenyl ring and the chromanone ring system are linked via an α-β unsaturated carbon bridge. The dihedral angle between the two terminal phenyl rings is 29.66 (6)°. The tetrahydro-4H-pyran-4 one ring in the chromanone moiety adopts a sofa conformation. The crystal packing is stabilized only by van der Waals forces.
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