No abstract

The title compound, C15H11F3INO2, adopts the enol–imine tautomeric form. The mol­ecule displays an E conformation with respect to the imine C=N double bond. The dihedral angle between the two benzene rings is 12.4 (2)°. The mol­ecular conformation is stabilized by an intra­molecular O—H⋯N hydrogen bond, which generates an S(6) ring motif. The trifluoro­meth­oxy­phenyl group is disordered over two sites with an occupancy ratio of 0.621 (6):0.379 (6). The crystal structure features C—H⋯π inter­actions.

In the title compound, C18H12F3NO2, the planes of the benzene ring and the naphthalene system form a dihedral angle of 47.21 (3)°. The hy­droxy group is involved in an intra­molecular O—H⋯N hydrogen bond. In the crystal, weak C—H⋯O and C—H⋯F inter­actions link the mol­ecules related by translations along the c and a axes, respectively, into sheets.

In the title mol­ecule, C20H17F2NO, which adopts an E conformation with respect to the imine C=N double bond, the mean planes of the naphthalene ring system and the difluoro­phenyl ring form a dihedral angle of 85.82 (7)°. An intra­molecular C—H⋯N hydrogen bond occurs. In the crystal, weak C—H⋯F hydrogen bonds link the mol­ecules into zigzag chains along [010].

In the title Schiff-base type compound, C18H13N3O5, the central furan ring makes dihedral angles of 12.80 (7) and 51.43 (4)° with the terminal benzene rings. The dihedral angle between the benzene rings is 45.43 (3)°. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into layers parallel to (010). In addition, there are π–π stacking inter­actions within the layer [centroid–centroid distance = 3.584 (1) Å] and between the layers [centroid–centroid distance 3.751 (1) Å].