title: The endo and exo isomers of 1-(4-isopropyl-3,5-dioxa-8-azabicyclo[5.1.0]octan-8-yl)pyrrolidine-2,5-dione.
abstract: The crystal structures of the title compounds, C12H18N2O4, have been determined in order to establish the relative configurations. In both structures, the isopropyl substituent strongly prefers the quasi-equatorial position. Therefore, the exo isomer adopts a dioxepanoaziridine pattern of a chair-chair (CC) conformation and the endo isomer a boat-chair (BC) conformation.
authors.affiliation: Institute for Chemistry, University of Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany.
authors.forename: Anil Kumar
authors.initials: AK
authors.lastname: Tripathi
authors.forename: Clemens
authors.initials: C
authors.lastname: Bruhn
authors.forename: Susanne
authors.initials: S
authors.lastname: Flock
authors.forename: Herbert
authors.initials: H
authors.lastname: Frauenrath