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The title fluorinated bis-benzoxazine, C 18 H 18 F 2 N 2 O 2 , crystallizes with one half-mol-ecule in the asymmetric unit, which is completed by inversion symmetry. The fused oxazine ring adopts an approximately half-chair conformation. The two benzoxazine rings are oriented anti to one another around the central C-C bond. The dominant inter-molecular inter-action in the crystal structure is a C-H⋯F hydrogen bond between the F atoms and the axial H atoms of the OCH 2 N methyl-ene group in the oxazine rings of neighbouring mol-ecules. C-H⋯π contacts further stabilize the crystal packing.

acta crystallographica. section e, crystallographic communications

Crystal structure and C—H...F hydrogen bonding in the fluorinated bis-benzoxazine: 3,3′-(ethane-1,2-diyl)bis(6-fluoro-3,4-dihydro-2<i>H</i>-1,3-benzoxazine)

Crystal structure and C—H...F hydrogen bonding in the fluorinated bis-benzoxazine: 3,3′-(ethane-1,2-diyl)bis(6-fluoro-3,4-dihydro-2H-1,3-benzoxazine)