2-(4-Bromo­phenyl)-5-(3,4-di­methoxy­phenyl)-3,4-di­methyl­thio­phene

The title compound, C₂₀H₁₉BrO₂S, was synthesized by the cyclization of 1-(4-bromo­phenyl)-4-(3,4-di­methoxy­phenyl)-2,3-di­methyl­butane-1,4-dione with 2,4-bis(4-methoxy­phenyl)-2,4-disulfanyl­ene-1,3,2,4-di­thia­diphosphetane. The dimethoxyphenyl and bromophenyl rings make dihedral angles of 28.4 (3) and 45.0 (3)°, respectively, with the thiophene ring. The bond lengths are unexceptional.

(E)-N-Benzoyl-N′-(3-hydr­oxy-4-methoxy­benzyl­idene)hydrazine

The molecule of the title compound, C₁₅H₁₄N₂O₃, is non-planar. The asymmetric unit contains two independent mol­ecules which are quite distinct from each other. Two bifurcated inter­molecular N—H...O hydrogen bonds help to establish the mol­ecular conformation and consolidate the crystal packing.

(E)-N′-(4-Benz­yloxy-3-methoxy­benzyl­idene)isonicotinohydrazide

The title compound, C₂₁H₁₉N₃O₃, was prepared by the reaction of 4-benz­yloxy-3-methoxy­benzaldehyde and isonicotinohydrazide. The vanillin group makes dihedral angles of 27.88 (7) and 58.94 (6)° with the planes of the pyridine and phenyl rings, respectively. A weak inter­molecular C—H...N hydrogen bond helps to consolidate the crystal packing.

(E)-N'-(3-Hydr­oxy-4-methoxy­benzyl­idene)isonicotinohydrazide

The molecule of the title compound, C₁₄H₁₃N₃O₃, is non-planar. The iso­vanillin group is almost perpendicular to the pyridine ring, the dihedral angle being 85.26 (7)°. An inter­molecular N—H...O hydrogen bond and a bifurcated intra/inter­molecular O—H...O,N hydrogen-bond system help to establish the mol­ecular conformation and consolidate the crystal packing.

(E)-1-[3-(Benz­yloxy)benzyl­idene]-2-(2,4-dinitro­phen­yl)hydrazine

The title compound, C₂₀H₁₆N₄O₅, is non-planar. The central benzene ring makes dihedral angles of 58.14 (6) and 5.00 (9)° with the terminal phenyl ring and the nitro­phenyl­hydrazine mean plane, respectively. A bifurcated intra/inter­molecular N—H...(O,O) hydrogen bond helps to establish the mol­ecular conformation and consolidate the crystal packing.

(E)-1-[3-(Benz­yloxy)-4-methoxy­benzyl­idene]-2-(2,4-dinitro­phen­yl)hydrazine acetonitrile solvate

The molecule of the title compound, C₂₀H₁₈N₄O₆·C₃H₃N, is non-planar. The central benzene ring makes dihedral angles of 85.73 (10) and 2.70 (12)° with the terminal phenyl ring and the nitro­phenyl­hydrazine mean plane, respectively. An intra­molecular N—H...O hydrogen bond helps to establish the mol­ecular conformation.

(E)-4-[4-(Benz­yloxy)-3-ethoxy­benzyl­ideneamino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

The title compound, C₂₇H₂₇N₃O₃, was prepared by the reaction of 4-(benz­yloxy)-3-ethoxy­benzaldehyde and 4-amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one. The ethyl­vanillin group makes dihedral angles of 72.97 (8) and 76.75 (5)° with the planes of the two terminal phenyl rings, and an angle of 39.24 (5)° with the pyrazolone ring plane. Inter­molecular C—H...N and C—H...O hydrogen bonds help to consolidate the crystal packing.

(E)-1-(4-Meth­oxy-3-propoxybenzyl­idene)-2-(4-nitro­phen­yl)hydrazine

The molecule of the title compound, C₁₇H₁₉N₃O₄, is not planar. The isovanillin group makes a dihedral angle of 3.23 (14)° with the phenyl­hydrazine residue. The nitro group and its attached aromatic ring are not coplanar, the dihedral angle between them being 3.18 (6)°. Inter­molecular N—H...O and C—H...O hydrogen bonds link adjacent mol­ecules, forming infinite chains.