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The title compound, C16H14Cl2N2O2, was synthesized by the reaction of 1-(5-chloro-2-hydroxyphenyl)ethanone with hydrazine hydrate. The molecule sits on a crystallographic center of symmetry at the mid-point of the central N—N bond and both N atoms are acceptors in an intramolecular hydrogen bond. In the crystal structure, the planar molecules are arranged in a sheet-like motif with one C—H...O bond linking molecules within the sheets and a second C—H...O interaction between neighboring sheets. There is also a close Cl...Cl intermolecular approach of 3.54 (1) Å within the sheets. [ABSTRACT FROM AUTHOR]

The structure of the title molecule, C15H13N3O4, is stabilized by intermolecular N—H...O hydrogen bonds. There are two crystallographically independent molecules in the asymmetric unit. The dihedral angles between the benzene rings in the two molecules are 86.75 (9) and 8.3 (2)°. [ABSTRACT FROM AUTHOR]

The title molecule, C30H28N2O2, (I), resides on a crystallographic inversion centre located at the midpoint of the N—N bond. It contains an intramolecular O—H...N interaction [O...N = 2.572 (2) Å] and a weak C—H...N contact [C...N = 2.752 (2) Å]. There are no intermolecular interactions of note in the crystal structure. [ABSTRACT FROM AUTHOR]

The title compound, C21H17ClN2O3, displays a trans configuration with respect to the C=N double bond. The crystal structure is stabilized by intramolecular O—H...N and intermolecular C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]