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The title compound, C21H12N2O2, contains three aromatic rings, which are not coplanar. The benzene ring and phthalo­nitrile group are connected by a bridging O atom, and the dihedral angle between them is 71.26 (4)°.

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The asymmetric unit of the title compound, C17H13ClN2O, contains two independent mol­ecules with no significant difference in their structures. The mol­ecules are non-planar. The dihedral angle between the two benzene rings is 79.20 (8)° in one mol­ecule and 79.54 (8)° in the other.

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The title compound, C18H14N2O3, a phthalo­nitrile derivative, contains two aromatic rings, one of which carries two cyano groups. The crystal structure is stabilized by one intramol­ecular C—H...O and two intermolecular C—H...O hydrogen bonds.

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The title compound, C22H14N2O3, contains three benzene rings, pairs of which form dihedral angles of 55.37 (5), 68.47 (4) and 82.82 (4)°. The average C-O-C angle is 119.0 (1)°.

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The title compound, C36H42O3, consists of three 2-iso­propyl­phenoxy­methyl groups bonded to the central benzene ring at the 1-, 3- and 5-positions. Intramolecular C—H...O hydrogen bonds seem to have an effect on the molecular conformation.

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The crystal structure of the title compound, C17H14N2O, is stabilized by weak van der Waals inter­actions.
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