Crystal structure of 1,2-bis-(6-bromo-3,4-dihydro-2-benz[][1,3]oxazin-3-yl)ethane: a bromine-containing bis-benzoxazine.

The title benzoxazine molecule, CHBrNO, 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 group 2/ with a centre of inversion located at the mid-point of the C-C bond of the central CHCH spacer. 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 the axis direction.