1-[5-(2-Chloro­phen­yl)-5-hy­droxy-3-methyl-4,5-dihydro-1H-pyrazol-1-yl]­ethanone

The title compound, C₁₂H₁₃ClN₂O₂, crystallizes with two independent but very similar mol­ecules (A and B) in the asymmetric unit. The pyrazole ring in each mol­ecule has an envelope conformation. The dihedral angle between the pyrazole ring mean plane and the benzene ring is 86.07 (14)° in A and 85.99 (14)° in B. In the crystal, the A and B mol­ecules are linked via a pair of O—H...O hydrogen bonds, forming dimers. These dimers are further linked via C—H...O inter­actions to form –A–B–A–B– chains propagating along the c-axis direction.

5,6-Dimethyl-4-phenyl-2H-pyran-2-one

In the title compound, C₁₃H₁₂O₂, the dihedral angle between the pyran­one and phenyl rings is 57.55 (9)°. In the crystal, the mol­ecules are linked by π–π stacking inter­actions between the parallel pyran­one rings of neighboring mol­ecules with distances of 3.5778 (11) Å and 3.3871 (11) Å between the planes. C—H...O interactions also occur.