title: Crystal structure of dimethyl 4,4'-di-meth-oxy-biphenyl-3,3'-di-carboxyl-ate.
abstract: In the title compound, C18H18O6, the benzene rings are coplanar due to the centrosymmetric nature of the mol-ecule, with an inversion centre located at the midpoint of the C-C bond between the two rings. Consequently, the methyl carboxyl-ate substituents are oriented in a trans fashion with regards to the bond between the benzene rings. The methyl carboxyl-ate and meth-oxy substituents are rotated slightly out of plane relative to their parent benzene rings, with dihedral and torsion angles of 18.52 (8) and -5.22 (15)°, respectively. The shortest O⋯H contact between neighbouring mol-ecules is about 2.5 Å. Although some structure-directing contributions from C-H⋯O hydrogen-bonding inter-actions are possible, the crystal packing seems primarily directed by weak van der Waals forces.
authors.affiliation: Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, PO Box 1126, 0315 Oslo, Norway.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Lundvall
authors.affiliation: Department of Chemistry, University of Bergen, PO Box 7803, 5020 Bergen, Norway.
authors.forename: Pascal D C
authors.initials: PD
authors.lastname: Dietzel
authors.affiliation: Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, PO Box 1126, 0315 Oslo, Norway.
authors.forename: Helmer
authors.initials: H
authors.lastname: Fjellvåg
keywords: centrosymmetric mol­ecule; crystal structure; inter­mediate compound for organic linkers in MOF synthesis