title: 2,2'-[2,3,5,6-Tetra-methyl-p-phenyl-enebis-(methyl-eneoxy)]dibenzoic acid.
abstract: The asymmetric unit of the title compound, C(26)H(26)O(6), contains only a half-mol-ecule, the other half being generated by an inversion center. The two carboxy-phenoxy-methyl 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 mol-ecules and C-H⋯π inter-actions link the mol-ecules into zigzag chains along (220) and (10); the two types of chain are arranged alternately, forming a three-dimensional framework.
authors.affiliation: Department of Chemistry, North University of China, Taiyuan, Shanxi 030051, People's Republic of China.
authors.forename: Tuoping
authors.initials: T
authors.lastname: Hu