title: Crystal structure of 3-(2,5-di-meth-oxy-phen-yl)propionic acid.
abstract: In the crystal of the title compound, C11H14O4, the aromatic ring is almost coplanar with the 2-position meth-oxy group with which it subtends a dihedral of 0.54 (2)°, while the 5-position meth-oxy group makes a corresponding dihedral angle of just 5.30 (2)°. The angle between the mean planes of the aromatic ring and the propionic acid group is 78.56 (2)°. The fully extended propionic side chain is in a trans configuration with a C-C-C-C torsion angle of -172.25 (7)°. In the crystal, hydrogen bonding is limited to dimer formation via R 2 (2)(8) rings. The hydrogen-bonded dimers are stacked along the b axis. The average planes of the two benzene rings in a dimer are parallel to each other, but at an offset of 4.31 (2) Å. Within neighbouring dimers along the [101] direction, the average mol-ecular benzene planes are almost perpendicular to each other, with a dihedral angle of 85.33 (2)°.
authors.affiliation: Institute of Inorganic Chemistry, University of Hamburg, Hamburg, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Bugenhagen
authors.affiliation: Department of Chemical Engineering.
authors.forename: Yosef
authors.initials: Y
authors.lastname: Al Jasem
authors.affiliation: Department of Chemistry, United Arab Emirates University, AL Ain, Abu Dhabi, United Arab Emirates.
authors.forename: Mariam
authors.initials: M
authors.lastname: AlAzani
authors.affiliation: Department of Chemistry, United Arab Emirates University, AL Ain, Abu Dhabi, United Arab Emirates.
authors.forename: Thies
authors.initials: T
authors.lastname: Thiemann
keywords: 3-(2,5-di­meth­oxy­phen­yl)propionic acid; O—H⋯O hydrogen bonding; crystal structure