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The title compound, C 23 H 23 FN 3 O 2 has been synthesized and the structure was investigated by X-ray diffraction studies. The compound crystallizes in the triclinic crystal class in the space group P1 with cell parameters a = 9.345(2) Å , b = 10.940(3) Å , c = 11.986(4) Å , a = 72.349(6)°, b = 68.106(18)°, c = 66.867(5)°, Z = 2 and V = 1027.8(5) Å 3 . The hydantoin ring adopts a planar conformation and is affected by the p conjugation. The pyrrolidine and piperidine rings in the bicyclo octane moiety adopt envelope and chair conformations respectively. The structure exhibits both inter and intramolecular hydrogen bonds of the type N-HÁÁÁO, C-HÁÁÁO and C-HÁÁÁN. One of the oxygen atoms attached to the hydantoin ring simultaneously accepts two hydrogen bonds to form a three centered hydrogen bonding pattern.

In the title chalcone derivative, C15H9Cl2FO, the dihedral angle between the aromatic rings is 19.13 (15)° and the double bond adopts anEconformation. In the crystal, molecules are connected by weak C—H...O hydrogen bonds, forming a chain propagating along the [001] direction.