Acta Cryst. (2009). E65, o327-o328  [ doi:10.1107/S1600536809001408 ]

Redetermination of 2,6-dimethoxybenzoic acid

G. Portalone

Abstract: The crystal structure of the title compound, C₉H₁₀O₄, was first reported by Swaminathan, Vimala & Lotter [Acta Cryst. (1976), B32, 1897-1900]. It has been re-examined, improving the precision of the derived geometric parameters. The asymmetric unit comprises a non-planar independent molecule, as the methoxy substituents force the carboxy group to be twisted away from the plane of the aromatic ring by 56.12 (9)°. Due to the antiplanar conformation adopted by the OH group, the molecular components do not form the conventional dimeric units, but are associated in the crystal in chains stabilized by linear O-HO hydrogen bonds, involving the OH groups and the carbonyl O atoms, which form C(3) motifs.

Online 17 January 2009

Copyright © International Union of Crystallography
IUCr Webmaster