3,4-Dimethyl-N-[(E)-3-nitro­benzyl­idene]-1,2-oxazol-5-amine

In the title compound, C12H11N3O3, the dihedral angle between the 3-nitro­benzaldehyde and 5-amino-3,4-dimethyl-1,2-oxazole moieties is 2.46 (12)°. The mol­ecule is close to planar, the r.m.s. deviation for the non-H atoms being 0.028 Å. The packing only features van der Waals inter­actions between the mol­ecules

(2E)-3-[4-(Dimethyl­amino)­phen­yl]-1-(2,5-dimethyl-3-thien­yl)prop-2-en-1-one

The asymmetric unit of the title compound, C17H19NOS, contains two independent mol­ecules which differ in the dihedral angles between the five- and six-membered rings [12.52 (10) and 4.63 (11)°]. Weak inter­molecular C—H⋯O hydrogen bonds link the two independent mol­ecules into pseudocentrosymmetric dimers. In one mol­ecule, the O atom of the carbonyl group is disordered over two positions in a 0.699 (4):0.301 (4) ratio

N-[(E)-1,3-Benzodioxol-5-yl­methyl­idene]-3,4-dimethyl-1,2-oxazol-5-amine

In the title compound, C13H12N2O3, the dihedral angle between the aromatic rings is 7.94 (12)°. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(6) loops. Weak π–π [centroid–centroid separations = 3.7480 (13) and 3.9047 (13) Å] and C—H⋯π inter­actions help to consolidate the packing

2,4,5-Trimeth­oxy­benzaldehyde monohydrate

In the title compound, C10H12O4·H2O, the 2,4,5-trimeth­oxy­benzaldehyde mol­ecule is almost planar (rms deviation = 0.0183 Å). There is an R 1 2(5) ring motif due to O—H⋯O hydrogen bonding. In the crystal, the mol­ecules are stabilized in the form of one-dimensional polymeric chains extending along [010] due to O—H⋯O hydrogen bonding with adjacent water mol­ecules. The H atoms involved in inter­molecular hydrogen bonding are disordered over two sets of sites of equal occupancy

N-(4-Chloro­benzyl­idene)-3,4-dimethyl­isoxazol-5-amine

The mol­ecule of the title compound, C12H11ClN2O, has E configuration at the azomethine double bond and is virtually planar with a dihedral angle of 1.25 (13)° between the benzene and isoxazole rings. C—H⋯π inter­actions stabilize the crystal structure

2-[(4-Chloro­benzyl­idene)amino]-4,5,6,7-tetra­hydro-1-benzothio­phene-3-carbonitrile

In the title compound, C16H13ClN2S, the dihedral angle between the 4-chloro­benzaldehyde moiety and the heterocyclic five-membered ring is 7.21 (17)°. In the crystal, mol­ecules are linked by weak C—H⋯π inter­actions, generating [100] chains

(E)-1-(2,5-Dimethyl-3-thien­yl)-3-(2-hy­droxy­phen­yl)prop-2-en-1-one

In the title compound, C15H14O2S, the dihedral angle between the aromatic rings is 8.46 –(8)°. The central enone group is planar (r.m.s. deviation = 0.0267 Å) and is oriented at a dihedral angle of 1.20 (9)° with respect to the benzene ring and at 8.27 (9)° with respect to the thio­phene group. In the crystal, the mol­ecules are linked into polymeric chains extending along the b axis due to inter­molecular O—H⋯O hydrogen bonding. An S(6) ring motif is formed due to a short intra­molecular C—H⋯O contact. C—H⋯π inter­actions involving a methyl group of the 2,5-dimethyl­thienyl group and the benzene ring are present. π–π inter­actions between the centroids of the benzene and heterocyclic rings [3.7691 (9) Å] also occur

2-(4-Sulfamoylphen­yl)hydrazin-1-ium chloride

The hydrazinium residue in the cation of the title salt, C6H10N3O2S+·Cl−, is twisted out of the plane of the benzene ring to which it is attached [N—N—C—C torsion angle = 25.9 (2)°] and the amino group is almost perpendicular to the benzene ring [N—S—C—C torsion angle = 88.71 (16)°]. In the crystal, the cations are linked by N—H⋯O hydrogen bonds and π–π inter­actions [ring centroid distance = 3.7280 (11) Å], forming layers in the bc plane that are connected by N—H⋯Cl hydrogen bonds

4-[(Anthracen-9-yl­methyl­idene)amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

In the title compound, C26H21N3O, the phenyl ring of the 4-amino­anti­pyrine group and the heterocyclic five-membered ring along with its substituents, except for the N-bound methyl group (r.m.s. deviation = 0.0027 Å), form a dihedral angle of 54.20 (5)°. Two S(6) ring motifs are formed due to intra­molecular C—H⋯N and C—H⋯O hydrogen bonds. In the crystal, mol­ecules are linked into supra­molecular chains along the a-axis direction via C—H⋯O contacts

N-[4-(Dimethyl­amino)­benzyl­idene]-3,4-dimethyl­isoxazol-5-amine

The aromatic rings attached to the azomethine double bond in the title compound, C14H17N3O, are trans to each other [C—C=N—C torsion angle = 179.5 (1)°], and they are approximately coplanar [dihedral angle between the five- and six-membered rings = 13.7 (1)°]