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

In the title compound, C(13)H(12)O(2), the dihedral angle between the pyran-one and phenyl rings is 57.55 (9)°. In the crystal, the mol-ecules are linked by π-π stacking inter-actions between the parallel pyran-one rings of neighboring mol-ecules with distances of 3.5778 (11) Šand 3.3871 (11) Šbetween the planes. C-H⋯O interactions also occur.

1-[5-(2-Chloro-phen-yl)-5-hy-droxy-3-methyl-4,5-dihydro-1H-pyrazol-1-yl]-ethanone.

The title compound, C(12)H(13)ClN(2)O(2), crystallizes with two independent but very similar mol-ecules (A and B) in the asymmetric unit. The pyrazole ring in each mol-ecule 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 mol-ecules are linked via a pair of O-H⋯O hydrogen bonds, forming dimers. These dimers are further linked via C-H⋯O inter-actions to form -A-B-A-B- chains propagating along the c-axis direction.