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In the title compound, C17H13Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is a intra­molecular O...H—N, rather than O—H...N, hydrogen bond, which forms a six-membered ring.

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In the title compound, C21H15Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is formation of a six-membered ring via an intra­molecular O...H—N, rather than O—H...N, hydrogen bond in the mol­ecule. The dihedral angle between the naphthalene ring system and the benzene ring of the 2H-chromen system is 87.41 (4)°. In the crystal, the mol­ecules are packed through N—H...O, π–π [centroid–centroid distances = 3.744 (3) and 3.780 (3) Å], C—Cl...π [Cl...centroid = 3.261 (3) Å], C—H...π and C—H...O inter­actions.

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The 1,3-diketone group of the title compound, C21H20O6, exists in a keto–enol form stabilized by a strong intra­molecular O—H...O hydrogen bond. As a result, a planar (mean deviation = 0.0099 Å) six-membered hydrogen-bonded ring is formed. The C—O and C—C bond lengths suggest significant electron delocalization in the ring. The dihedral angle between the six-membered hydrogen-bonded ring and its adjacent benzene ring is 8.78 (5)° and that between the benzene rings is 19.70 (5)°. In the crystal, mol­ecules are packed in a layered structure parallel to the b axis through C—H...O and π–π inter­actions [centroid–centroid distance between stacked benzene rings = 3.868 (2) Å].

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The title compound, C16H13NO3, exists in the keto form and the iso­quinoline system is essentially planar (mean deviation = 0.0424 Å). The dihedral angle between the aromatic rings is 4.2 (2)°. In the crystal, mol­ecules are linked via weak C—H...O hydrogen bonds and C—H...π inter­actions, forming a three-dimensional structure.

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The title mol­ecule, C9H7NO3, exists in the diketo form and the iso­quinoline unit is approximately planar (r.m.s. deviation = 0.0158 Å). In the crystal, mol­ecules are linked into inversion dimers through pairs of O—H...O hydrogen bonds and are further assembled into the (100) layers via stacking inter­actions [centroid–centroid distances = 3.460 (3) and 3.635 (4) Å].
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