Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 11 (November 2012)

organic compounds

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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