N'-[(1E)-1-(5-Chloro-2-hydroxy-phen-yl)propyl-idene]-4-methoxy-benzohydrazide.

The title compound, C(17)H(17)ClN(2)O(3), has a trans conformation about the C=N double bond and an intra-molecular O-H⋯N occurs. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds.

(E,E)-2,5-Bis(5-chloro-2-methoxyphenyl)-3,4-diazahexa-2,4-diene.

The title compound, C(18)H(18)Cl(2)N(2)O(2), was synthesized by the reaction of 1-(5-chloro-2-methoxy-phen-yl)ethanone with hydrazine hydrate. The mol-ecule lies on a crystallographic twofold axis passing through the mid-point of the N-N bond with one half-mol-ecule in the asymmetric unit. The dihedral angle between the two aromatic rings is 44.

(E)-2-Hydr-oxy-3-methoxy-benzaldehyde thio-semicarbazone.

In the title compound, C(9)H(11)N(3)O(2)S, intra-molecular O-H⋯O and N-H⋯N hydrogen bonds contribute to the planarity of the mol-ecular skeleton. Inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into zigzag chains along the b axis; these mol-ecules are futher paired by π-π inter-actions [centroid-centroid distance 4.495 (5) Å].

(E)-2-Meth-oxy-6-[(5-methyl-isoxazol-3-yl)imino-meth-yl]phenol.

In the title mol-ecule, C(12)H(12)N(2)O(3), the benzene and isoxazole rings form a dihedral angle of 5.9 (6)°. The hydr-oxy group is involved in an intra-molecular O-H⋯N hydrogen bond [O⋯N = 2.

3-Amino-1-phenyl-4-(propan-2-yl-idene)pyrazol-5(4H)-one.

In the title mol-ecule, C(12)H(13)N(3)O, the phenyl and the pyrazole rings make a dihedral angle of 7.5 (2)°. Inter-molecular N-H⋯O hydrogen bonds involving the amino group link the mol-ecules into a three-dimensional framework.

2-Hydr-oxy-N'-[(1Z)-1-(2-hydr-oxy-5-methyl-phen-yl)-2-methyl-propyl-idene]benzohydrazide.

The title compound, C(18)H(20)N(2)O(3), adopts a cis conformation with respect to the C=N double bond. The crystal structure is stabilized by intra-molecular N-H⋯O and inter-molecular O-H⋯O hydrogen bonds.