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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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In the title compound, C22H16N2O2S2, two benzene rings are connected by a phthalo­nitrile moiety, the dihedral angle between them being 47.9 (2)°. The crystal structure is stabilized by intermolecular C—H...N contacts.

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The title compound, C24H24N4O3, contains three aromatic rings and a triazole ring which are not coplanar. In the crystal structure the mol­ecules are linked by C—H...N, C—H...O, N—H...N, C—H...π and π–π interactions.

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The title compound, C12H13ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H...O hydrogen bond. The configuration around the C=N bond is trans. The dihedral angle between the aromatic ring and the aliphatic chain is 5.52 (9)°. Symmetry-related mol­ecules are linked via C—H...O hydrogen bonds to form chains along the b axis.

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

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The title compound, C12H12ClFN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H...O hydrogen bond. The whole mol­ecule is roughly planar, the largest deviation from the mean plane being 0.328 (3) Å for the terminal methyl C atom of the ethyl side chain.

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In the crystal structure of the title compound, C13H20N2O3S, there are some inter- and intra­molecular N—H...O, N—H...N and C—H...O hydrogen-bonding inter­actions.

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The title compound, C13H15ClN2O4, adopts a keto–hydrazo tautomeric form stabilized by intra­molecular N—H...O hydrogen bonds. The phenyl­hydrazone fragment is planar within ±0.028 (2) Å. The dihedral angle between the phenyl­hydrazone and oxobutanoate planes is 8.15 (9)°. Symmetry-related mol­ecules are linked via C—H...O hydrogen bonds to form chains along [101].

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The title compound, C12H12Cl2N2O3, adopts a keto-hydrazo tautomeric form stabilized by an intra­molecular hydrogen bond. The mol­ecule can be considered as consisting of two connected fragments, viz. a chloro­phenyl­hydrazone group, with a Z configuration, and an oxobutanoate group. The mol­ecule is roughly planar, the dihedral angle between the benzene ring and the plane including the aliphatic chain being 4.7 (2)°.
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