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2,3-Dimethoxy-10-oxostrychnidinium 2-carboxy-4,5-dichlorobenzoate

✍ Scribed by Smith, Graham ;Wermuth, Urs D. ;White, Jonathan M.

Publisher: International Union of Crystallography
Year: 2007
Tongue: English
Weight: 696 KB
Volume: 63
Category: Article
ISSN: 1600-5368
DOI: 10.1107/s1600536807047952

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✦ Synopsis

The structure of the title compound, C~23~H~27~N~2~O~4~
^+^·C~8~H~3~Cl~2~O~4~
^−^, a 1:1 proton-transfer compound of brucine with 4,5-dichlorophthalic acid, has been determined at 130 K. The brucinium cations and the hydrogen phthalate anions associate through single N—H...O~carboxylate~ hydrogen bonds [2.639 (3) Å], giving dimers which are extended via weak head-to-tail C—H...O~methoxy~ associations into chains forming down the 2~1~ screw axis of the unit cell. The carboxyl proton of the anion gives a short intramolecular O—H...O~carboxylate~ hydrogen bond [2.441 (3) Å].

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