title: Exo Diels-Alder adducts between ortho- and para-N-acetoxyphenylmaleimides and furan.
abstract: In exo-2-(3,5-dioxo-10-oxa-4-azatricyclo[5.2.1.0(2,6)]dec-8-en-4-yl)phenyl acetate, C(16)H(13)NO(5), the plane of the acetoxy group lies almost perpendicular to that of the phenyl ring [dihedral angle = 89.8 (1) degrees ], in contrast with the smaller deviations found in the para isomer exo-4-(3,5-dioxo-10-oxa-4-azatricyclo[5.2.1.0(2,6)]dec-8-en-4-yl)phenyl acetate, C(16)H(13)NO(5), these being 63.6 (1) and 37.0 (1) degrees for the two crystallographically independent molecules. Irrespective of the position of the acetoxy group, both compounds pack through soft C-H.X (X is O or phenyl) interactions, forming interlinked centrosymmetric tetramers in the bc plane.
authors.affiliation: Sección de Graduados y Departamento de Bioquímica, Escuela Superior de Medicina, Instituto Politécnico Nacional, México DF 11340, Mexico.
authors.forename: Jose G
authors.initials: JG
authors.lastname: Trujillo-Ferrara
authors.forename: Efrén V
authors.initials: EV
authors.lastname: García-Báez
authors.forename: Itzia I
authors.initials: II
authors.lastname: Padilla-Martínez
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Martínez-Martínez
authors.forename: Norberto
authors.initials: N
authors.lastname: Farfan-García