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

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

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The asymmetric unit of Horse Combs 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 Fish 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.