Acta Cryst. (2008). E64, o855 [ doi:10.1107/S1600536808009823 ]
Abstract: In the molecule of the title compound, C19H22N2O2, the pyrazolidinone ring has an envelope conformation, with the C atom attached to the 4-methoxyphenyl ring displaced by 0.354 (3) Å from the plane of the other ring atoms. The 4-isopropylphenyl ring is oriented with respect to the 4-methoxyphenyl ring at a dihedral angle of 88.94 (3)°. Intramolecular C-HN hydrogen bonds result in the formation of two planar five-membered rings, which are oriented with respect to the adjacent 4-isopropylphenyl and 4-methoxyphenyl rings at dihedral angles of 4.05 (3) and 0.50 (3)°, respectively. In the crystal structure, intermolecular N-HO hydrogen bonds link the molecules into centrosymmetric dimers.
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