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

Graham Smith, Urs D. Wermuth, Jonathan M. White
2007 Acta Crystallographica Section E  
The structure of the title compound, C23H27N2O4 +·C8H3Cl2O4 −, 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...Ocarboxylate hydrogen bonds [2.639 (3) Å], giving dimers which are extended via weak head-to-tail C—H...Omethoxy associations into chains forming down the 21 screw axis of the unit cell. The carboxyl proton of the anion gives a short
more » ... a short intramolecular O—H...Ocarboxylate hydrogen bond [2.441 (3) Å].
doi:10.1107/s1600536807047952 fatcat:zr6ozrw7hnavlatjrul26tcqui