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 naphthalene derivative, the mean plane of the naphthalene ring system makes dihedral angles of 65.24 (12)° with the di­methyl­phenyl ring and 55.82 (12)° with meth­oxy­phenyl ring. The latter two rings are inclined to each other by 59.28 (14)°.

The asymmetric unit of the title compound, C17H10Cl4O, consists of one independent molecule and two molecules each located on twofold symmetry axes through the central C=O bond such that they each contribute half a molecule each to the asymmetric unit. The dihedral angles between the rings in the three molecules are 73.1 (3), 65.3 (3) and 75.4 (3)°. In the crystal, molecules are linked through C—H...O hydrogen bonds, generating undulated molecular sheets lying parallel to (110).

In the title compound, C41H41N3O9·2.25H2O, the cyclohexanol ring adopts a chair conformation. The cyclohexanol ring makes dihedral angles of 87.89 (7) and 75.53 (8)° with the mean planes of the trimethoxyphenyl rings and dihedral angles of 84.18 (8), 85.07 (7) and 82.03 (8)° with the pyridine rings. In the crystal, the packing is stabilized by C—H...O, O—H...O and O—H...N hydrogen bonds involving water molecules and methoxy O atoms, resulting in a supramolecular network. One of the methoxy groups is disordered over two sets of sites with occupancy factors of 0.63 (3) and 0.37 (3).

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.