4,4′-[4,4′-Sulfonylbis(p-phenyleneoxy)]dibutanoic acid

Abstract

In the title compound, C20H22O8S, the dihedral angle between the two benzene rings is 81.6 (3)°. The benzene-connected portions of the alkoxy substituents are almost coplanar with their respective rings [C—C—O—C torsion angles of 174.77 (17) and −178.5 (4)°]. One of the butanoic acid groups is disordered over two conformations with a site-occupancy ratio 0.719 (6):0.281 (6). In the crystal, pairs of O—H...O hydrogen bonds link the molecules into infinite zigzag chains along [130].