N′-Benzyl­idene-2-chloro-N-(4-chloro­phen­yl)acetohydrazide

In the title compound, C₁₅H₁₂Cl₂N₂O, the atoms not making up the chloro­benzene ring are approximately coplanar (r.m.s. deviation = 0.073 Å). The dihedral angle between these 13 atoms and the chloro­benzene ring is 67.37 (10)°. The C=O and Csp²—Cl groups are almost eclipsed [Cl—C—C=O = −6.5 (3)°]. In the crystal, C(6) chains linked by C—H...O hydrogen bonds result in [100] chains.

4-(4-Methyl­phen­yl)-2-(prop-2-yn-1-yl)phthalazin-1(2H)-one

In the title compound, C₁₈H₁₄N₂O, the dihedral angle between the methyl­phenyl ring and the phthalazone ring system (r.m.s. deviation = 0.034 Å) is 53.93 (9)°. In the crystal, mol­ecules are connected by C—H...O hydrogen bonds, forming chains along [101]. The chains are linked by π–π inter­actions [centroid–centroid distance 3.6990 (12) Å], forming layers parallel to (10-1).