title: Crystal structure of 1,2-bis-(6-bromo-3,4-dihydro-2H-benz[e][1,3]oxazin-3-yl)ethane: a bromine-containing bis-benzoxazine.
abstract: The title benzoxazine molecule, C18H18Br2N2O2, was prepared by a Mannich-type reaction of 4-bromo-phenol with ethane-1,2-di-amine and formaldehyde. The title compound crystallizes in the monoclinic space groupC2/cwith a centre of inversion located at the mid-point of the C-C bond of the central CH2CH2spacer. The oxazinic ring adopts a half-chair conformation. The structure is compared to those of other functionalized benzoxazines synthesized in our laboratory. In the crystal, weak C-H⋯Br and C-H⋯O hydrogen bonds stack the mol-ecules along theb-axis direction.
authors.affiliation: Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Cra 30 No. 45-03, Bogotá, Código Postal 110911, Colombia.
authors.forename: Augusto
authors.initials: A
authors.lastname: Rivera
authors.affiliation: Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Cra 30 No. 45-03, Bogotá, Código Postal 110911, Colombia.
authors.forename: Jicli José'
authors.initials: JJ
authors.lastname: Rojas
authors.affiliation: Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Cra 30 No. 45-03, Bogotá, Código Postal 110911, Colombia.
authors.forename: Jaime
authors.initials: J
authors.lastname: Ríos-Motta
authors.affiliation: Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von Laue-Str., 7, 60438 Frankfurt/Main, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Bolte
keywords: C—H⋯Br and C—H⋯O hydrogen bonds; benzoxazines; crystal structure; phenolic resins