Acta Cryst. (2008). E64, o784  [ doi:10.1107/S1600536808005898 ]

(3S,4S)-3-Ethyl-4-hydroxy-3-(3-methoxyphenyl)-1-methylazepan-1-ium D-tartrate dihydrate

X.-H. Wang, B. Chao and Z.-B. Qiu

Abstract: In the title compound, C₁₆H₂₆NO₂⁺·C₄H₅O₆^-·2H₂O, a meptazinol derivative, three C atoms of the azepane ring are disordered over two positions, with site-occupancy factors of 0.80 and 0.20; the major disorder component adopts a twist-chair conformation, while the minor component has a chair conformation. The benzene ring is axially substituted on the heterocyclic ring, resulting in a folded conformation of the cation. The absolute configuration was determined with reference to D-tartaric acid. The crystal structure is stabilized by an extensive network of intra- and intermolecular O-HO hydrogen bonds.

Online 2 April 2008

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