(IUCr) Crystallography Journals Online

ab1322 scheme

Acta Cryst. (1996). C52, 228-231 [ doi:10.1107/S0108270195014478 ]

Co-Crystallization of Stereoisomers of N,N'-Bis(2-phenyl-5-hydroxymethyl-1,3-dioxan-5-yl)ethanediamide

J.-N. Ross, J. L. Wardell, J. N. Low and G. Ferguson

Abstract: X-ray analysis has revealed that two stereoisomers of the title compound, C₂₄H₂₈N₂O₈, co-crystallize in form (I). The unit cell of (I) contains equal numbers of the N,N'-bis(trans-2-phenyl-5-hydroxymethyl-1,3-dioxan-5-yl)ethanediamide, (Ia), and the N,N'-bis(cis-2-phenyl-5-hydroxymethyl-1,3-dioxan-5-yl)ethanediamide, (Ib), stereoisomers, each lying about crystallographic inversion centres. Fractional crystallization of this mixture afforded crystals (II) containing only molecules of stereoisomer (Ia), also with crystallographic inversion symmetry. The stereoisomer (Ia) is Z-shaped in (I) and (II), whereas (Ib) is maximally extended. In both (I) and (II), the molecules are linked about inversion centres by O-HO hydrogen bonds.

Formula: Two isomers of C₂₄H₂₈N₂O₈


	Structure factor file (CIF format) (173.1 kbytes) Contains datablock I

	Structure factor file (CIF format) (62.4 kbytes) Contains datablock 9418

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