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Supporting information: this article has supporting information at journals.iucr.org/e Crystal structure, Hirshfeld surface analysis and DFT studies of 1-[r-2,c-6-diphenyl-t-3-(propan-2yl)piperidin-1-yl]ethan-1-oneIn the title compound, C 22 H 27 NO, the piperidine ring adopts a chair conformation. The dihedral angles between the mean plane of the piperidine ring and the phenyl rings are 89.78 (7) and 48.30 (8) . In the crystal, molecules are linked into chains along the b-axis direction by C-HÁ Á ÁO hydrogen bonds. The DFT/B3LYP/6-311 G(d,p) method was used to determine the HOMO-LUMO energy levels. The molecular electrostatic potential surfaces were investigated by Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyse the intermolecular interactions in the molecule.

In the title compound, C8H5ClN2Se, the dihedral angle between the planes of the selenadiazole and chlorophenyl rings is 16.6 (2)°. In the crystal, the packing of the molecules is consolidated by weak C—H...N hydrogen bonds, which generate [001] chains, and π–π stacking interactions are observed between the phenyl and selenadiazole rings, with a centroid–centroid distance of 3.884 (2) Å. There is also a short Se...Cl contact of 3.468 (1) Å

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The crystal and mol­ecular structures of the pyran derivative 2-amino-4-(2-chloro­phen­yl)-7-hy­droxy-4H-benzo[1,2-b]pyran-3-carbo­nitrile is reported. Hirshfeld surface analysis was performed on the mol­ecule and frontier orbitals were investigated with density functional theory calculations.