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The title compound, C20H17NO6, was synthesized by the reaction of syringaldehyde with hippuric acid. The molecule adopts a Z configuration about the central olefinic bond. The two benzene rings and the oxazolone ring are almost coplanar. The crystal structure is stabilized by weak intermolecular C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C15H15N3O4·H2O, the organic molecule exists in the keto–imine tautomeric form. The benzene ring makes a dihedral angle of 49.9 (2)° with the pyridine ring. The molecules pack in a three-dimensional framework structure by a combination of O—H...O, O—H...N, N—H...O and N—H...N hydrogen bonds. The water molecule of hydration is disordered [ratio of components 0.758 (7):0.242 (7)]. [ABSTRACT FROM AUTHOR]

In the title compound, C24H18F3N3O, the molecule exists in the enamine–keto tautomeric form. The pyrazolone ring makes dihedral angles of 31.8 (2), 45.4 (2) and 71.2 (2)° with the 1-phenyl, aniline and methylene-bound phenyl rings, respectively. An intramolecular N—H...O hydrogen bond helps to stabilize the molecular conformation. [ABSTRACT FROM AUTHOR]

In the title compound, C21H26N2O3, the molecule adopts an E configuration about the central C=N double bond and exists in the phenol–imine tautomeric form. The two benzene rings make a dihedral angle of 38.5 (4)°. Intramolecular O—H...N hydrogen bonding is present. [ABSTRACT FROM AUTHOR]

The title compound, C18H17N3O4, was synthesized by the condensation of 2,3,4-trihydroxybenzaldehyde with 4-aminoantipyrine. The molecule adopts a trans configuration about the central C=N double bond and exists in the phenol–imine form. Molecules are linked into a two-dimensional framework by intermolecular O—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C21H18N4O, was synthesized by condensation of quinoline-2-carbaldehyde and 4-aminoantipyrine. The mean planes of the pyrazole and phenyl rings make a dihedral angle of 55.7 (3)°. The crystal packing is stabilized by weak intermolecular C—H...O hydrogen bonds and π–π interactions. [ABSTRACT FROM AUTHOR]

The title compound, C19H22N2O7·H2O, was synthesized as part of a continuing project involving the structures of hydrazone derivatives. The molecules pack in a three-dimensional framework structure by a combination of O—H...O, O—H...N and N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

Molecules of the title compound, C19H16N4O2·H2O, are linked into a one-dimensional ladder structure by a combination of intermolecular O—H...O and N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C26H20N4O, was synthesized by the reaction of 1-phenyl-3-methyl-4-benzoylpyrazol-5-one and 8-aminoquinoline. The molecule exists in the enamine–keto tautomeric form. [ABSTRACT FROM AUTHOR]

In the title compound, C22H18N4O4·2H2O, the hydrazine molecule lies across a twofold rotation axis, the mean planes of the two quinoline ring systems forming a dihedral angle of 64.1 (2)°. The hydrazine molecules and two water molecules are linked into infinite chains by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C20H19N3O3·1.5H2O, has two organic mol­ecules in the asymmetric unit which differ in conformation. The two independent mol­ecules and three water mol­ecules are linked into layers by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C23H28O6, the mean planes of the two benzene rings make a dihedral angle of 81.1 (2)°. A twofold rotation axis passes through the central C atom. The molecules are connected into chains via intermolecular O—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]