2-(1,3-Benzodioxol-5-yl)-1H-benzimid­azole

The asymmetric unit of the title compound, C₁₄H₁₀N₂O₂, contains two independent mol­ecules. In each mol­ecule, the benzodioxole ring system displays an envelope conformation, with the methyl­ene C atom located at the flap deviating by 0.081 (2) and 0.230 (2) Å from the mean plane formed by the other atoms. The dihedral angles between the benzo­imidazole ring system (all atoms) and the benzodioxole benzene ring are 15.35 (6) and 10.99 (7)°. In the crystal, mol­ecules are linked by N—H...N hydrogen bonds into chains running along the [101].

(E)-4-Chloro-2-{[4-(di­methyl­amino)­benzyl­idene]amino}­phenol

In the title aromatic Schiff base compound, C₁₅H₁₅ClN₂O, the mol­ecule exists in a trans conformation with respect to the C=N bond. The dihedral angle between the benzene rings is 14.49 (6)°. In the crystal, weak C—H...π inter­actions link mol­ecules into supra­molecular chains propagated along the a-axis direction.

Crystal structure of (Z)-3-benz­yloxy-6-[(2-hy­droxy-5-methyl­anilino)methyl­idene]cyclo­hexa-2,4-dien-1-one

In the title Schiff base compound, C₂₁H₁₉NO₃, the conformation about the C=C bond is Z. The N—H group and carbonyl O atom form an intra­molecular N—H...O hydrogen bond with an S(6) ring motif. The benz­yloxy ring and the 2-hy­droxy-5-methyl­phenyl ring are inclined to the central six-membered ring by 13.68 (9) and 9.13 (8)°, respectively, and to one another by 21.95 (9)°. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, forming helical chains along [010].