title: (±)-Cyclo-hexane-1,2-diyl bis-(4-nitro-benzoate).
abstract: The crystal structure of the title compound, C(20)H(18)N(2)O(8), has been investigated to establish the relative stereochemistry between the ester groups. The cyclo-hexane ring adopts a chair conformation, in which the two ester groups occupy the adjacent equatorial positions in a trans relationship with each other. The mol-ecules assemble in the crystal as chains along the c axis via C-H⋯π inter-actions between the cyclo-hexane ring and a pair of nitro-phenyl rings of the neighbouring mol-ecule. Also observed are π-π stacking inter-actions between the nitro-phenyl rings of neighbouring chains, with a perpendicular distance between these rings of 3.409 Å and a slippage of 0.969 Å.
authors.affiliation: Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Sok Teng
authors.initials: ST
authors.lastname: Tong
authors.forename: David
authors.initials: D
authors.lastname: Barker
authors.forename: Ka Wai
authors.initials: KW
authors.lastname: Choi
authors.forename: Peter D W
authors.initials: PD
authors.lastname: Boyd
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Brimble