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In the title compound, C17H19NO2, the aromatic rings are oriented at a dihedral angle of 59.27 (12)°. In the crystal, inversion dimers linked by pairs of weak C—H...O interactions generate R22(12) loops.

The asymmetric unit of the title compound, C13H11ClN2, contains two geometrically distinct molecules; one molecule is close to planar [dihedral angle between the aromatic rings = 2.44 (18)°] and the other is twisted about the linking hydrazide group [dihedral angle = 14.08 (19)°]. In the crystal, the N—H groups do not form hydrogen bonds and the molecules are linked by weak C—H...π interactions.

The crystal of the title compound, 0.6C(14)H(12)N(2)O(3)·0.4C(14)H(12)N(2)O(3), contains a mixture of its neutral (OH containing) and zwitterionic (NH containing) forms, in a 0.60 (4):0.40 (4) ratio. The former generates an S(6) loop via an intra-molecular O-H⋯N hydrogen bond and the latter generates an S(6) loop via an N-H⋯O hydro-gren bond. The aromatic rings are oriented at a dihedral angle of 42.52 (10)°. In the crystal, C-H⋯π inter-actions occur and aromatic π-π stacking inter-actions [centroid-centroid separations = 3.7106 (12) and 3.9177 (13) Å] consolidate the packing.

In the title compound, C14H10FNO3, the dihedral angle between the two benzene rings is 32.66 (14)°. An S(6) ring motif is formed due to an intramolecular O—H...O hydrogen bond between the hydroxy and carbonyl groups. In the crystal, molecules are consolidated into dimers with R22(8) ring motifs by pairs of O—H...O hydrogen bonds.

In the title compound, C18H23O4P, the dihedral angle between the aromatic ring planes is 69.94 (14)°. Both ethyl side chains are disordered over two sets of sites, with occupancy ratios of 80:20 and 70:30. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds occur, leading toR21(8) loops, and C—H...O and weak C—H...π interactions are also seen.

The two symmetry-independent molecules in the asymmetric unit of the title compound, C15H13NO2, differ in conformation, with the virtually planar 4-methylaniline (r.m.s. deviations of 0.0511 and 0.0082 Å) and piperonal groups (r.m.s. deviations of 0.0241 and 0.0486 Å) forming dihedral angles of 19.40 (5) and 42.90 (6)°. In the crystal, molecules are linked by C—H...O and C—H...π interactions. The H atoms of the two methyl groups are disordered over two sets of sites of equal occupancy.

In the title compound, C14H11Cl2N, the dihedral angle between the 4-methylanilinic and 2,4-dichlorobenzaldehyde moieties is 7.37 (8)°. In the crystal, C—H...π interactions between the terminal methyl group and a symmetry-related ring of the anilinic group help to establish the packing.

In the title compound, C15H15NO, the almost planar 2,3-dimethylaniline unit and the salicylaldehyde group (r.m.s. deviations of 0.0156 and 0.0109 Å, respectively) are oriented at a dihedral angle of 43.69 (9)° with respect to each other. An S(6) ring motif is formed due to intramolecular O—H...N hydrogen bonding. In the crystal, C—H...π interactions occur between the 2,3-dimethylaniline unit and the salicylaldehyde group, where the CH is from the o-methyl group.

The asymmetric unit of the title compound, C15H14ClNO2, contains two molecules with significantly different conformations: the dihedral angles between the 4-chloroaniline and 3,4-dimethoxyphenyl (excluding C atoms) moieties are 19.68 (7) and 45.54 (4)°. In the crystal, the molecules are linked by C—H...O hydrogen bonds and weak C—H...π interactions.

In the title compound, C13H14N2, the dihedral angle between the aromatic rings is 69.73 (14)°. In the crystal, inversion dimers linked by pairs of N—H...N hydrogen bonds generate R22(10) loops. A weak C—H...π interaction also occurs.