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Acta Cryst. (2013). E69, o734
[ doi:10.1107/S1600536813009872 ]

(1R*,2R*,3S*,4R*)-Diethyl 4-hydroxy-4-methyl-2-(4-methylphenyl)-6-oxocyclohexane-1,3-dicarboxylate

A. I. Ismiev, N. A. Gadirova, K. E. Hajiyeva, R. K. Askerov and K. A. Potekhin

Abstract: The title compound, C20H26O6, is chiral and crystallizes as a racemate: the relative configuration of the stereogenic centres is 1R*,2R*,3S*,4R*. The cyclohexane ring has a chair conformation. The ethyl fragment of the ethoxycarbonyl group in the 3-position is disordered over two sets of sites in a 0.650 (6):0.350 (6) ratio. The hydroxy group acts as a bifurcated hydrogen-bond donor, forming both intra- and intermolecular hydrogen bonds with ester carbonyl O atoms. The intermolecular hydrogen bonds form inversion dimers in the crystal.


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