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Acta Cryst. (2012). E68, o3233-o3234
[ doi:10.1107/S1600536812043619 ]

1,3-Dicyclohexylimidazolidine-2,4,5-trione: a second polymorph

O. Talhi, J. A. Fernandes, D. C. G. A. Pinto, A. M. S. Silva and F. A. Almeida Paz

Abstract: The title compound, C15H22N2O3, was obtained as a by-product of oxidative cleavage of 1,3-dicyclohexyl-(3-oxo-2,3-dihydrobenzofuran-2-yl)imidazolidine-2,4-dione. Herein, we report the crystal structure of a second polymorph, which was obtained by crystallization from an ethanol solution at 253 K, instead of slow evaporation of the same solvent at room temperature. While the first polymorph [Talhi et al. (2011). Acta Cryst. E67, o3243] crystallized in the non-centrosymmetric space group P212121, this second polymorph crystallizes in the centrosymmetric space group P21/n. Compared to the first polymorph, in the crystal no C=O...C=O interactions were found (C...O intermolecular distance longer than 3.15 Å) and instead, close packing of individual molecular units is mediated by C-H...[pi] and weak C-H...O interactions.

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