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1.  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.
doi:10.1107/S1600536812011233
PMCID: PMC3344077  PMID: 22589986
2.  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.
doi:10.1107/S1600536812007283
PMCID: PMC3297897  PMID: 22412700

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