2,2′-[2,3,5,6-Tetramethyl-p-phenylenebis(methyleneoxy)]dibenzoic acid

Abstract

The asymmetric unit of the title compound, C26H26O6, contains only a half-molecule, the other half being generated by an inversion center. The two carboxyphenoxymethyl units occupy the 1,4-positions of the central aromatic ring. The central ring and the six linked C atoms are almost planar, with a maximum deviation of 0.0286 (17) Å, and the plane makes a dihedral angle of 75.50 (6)° with the benzene ring. In the crystal, strong O—H...O hydrogen bonds between the carboxyl groups of adjacent molecules and C—H...π interactions link the molecules into zigzag chains along (220) and (overline{1}10); the two types of chain are arranged alternately, forming a three-dimensional framework.