2,4-Dimethoxybenzoic acid and 2,5-dimethoxybenzoic acid
The title compounds (both C9H10O4) have nearly planar structures, and the methyl and/or carboxylic acid groups lie out of the molecular plane, as dictated by steric interactions. 2,5-Dimethoxybenzoic acid (2,5-DMBA) forms an unusual intramolecular hydrogen bond between the carboxylic acid group and the O atom of the methoxy group in the 2-position [O…O = 2.547 (2) Å and O—H…O = 154 (3)°]. 2,4-DMBA forms a typical hydrogen-bond dimer with a neighboring molecule.
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Document Type: Research Article
Publication date: 2004-04-01