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

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 253K, 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) and instead, close packing of individual molecular units is mediated by C-H_¹ and weak C-H_O interactions.

authors

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

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