2-Acetyl-4-(2-chorophenyl­diazen­yl)phenol

In the title structure, C₁₄H₁₁N₂O₂Cl, the benzene rings are in a trans configuration with respect to the azo double bond and the mol­ecule is essentially planar.

2-Acetyl-4-(4-ethoxy­phenyl­diazen­yl)phenol

In the title structure, C₁₆H₁₆N₂O₃, the benzene rings are in a trans configuration with respect to the azo double bond and the mol­ecule is essentially planar.

4-[2-Methyl-4-(4-methyl­phenyl­diazen­yl)phen­oxy]phthalonitrile

The title compound, C₂₂H₁₆N₄O, displays a trans configuration with respect to the –N=N– double bond, as found for other diazene derivatives. There is a weak intra­molecular C—H...N hydrogen bond, which seems to have an effect on the mol­ecular conformation. The crystal packing is governed by weak inter­molecular C—H...N and C—H...O hydrogen bonds, and weak C—H...π stacking.