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The title compound, C 23 H 17 F 2 NO, which crystallizes with two independent mol­ecules in the asymmetric unit, was prepared by the cyclization of 4-[2-bis­(4-fluoro­phen­yl)methyl­eneamino]but-3-yn-1-ol at room temperature. The mol­ecules display a tripod conformation. The two fluoro­phenyl rings make dihedral angles of 79.26 (2) and 85.87 (1)° [86.53 (1) and 83.67 (2)° in the second mol­ecule] with the indole ring, and the dihedral angles between the fluoro­phenyl rings are 67.74 (2) and 66.33 (2)°, respectively. Furthermore, the indole rings are located on the edge of the respective oxazine half-chair ring systems. Nonconventional C—H⋯π contacts between indole and fluoro­phenyl rings are observed.

1,1-Bis(4-fluorophenyl)-3,4-dihydro-1H-1,3-oxazino[3,4-a]indole