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The molecule of the title compound C19H18O6, adopts anEconformation about the C=C double bond and the C—C=C—C torsion angle is −179.30 (16)°. The molecule is nearly planar, as indicated by the dihedral angle of 6.99 (6)° between the benzene ring and the benzodioxalane ring. In the crystal, molecules are linkedviaweak C—H...O hydrogen bonds, forming zigzag chains propagating along thebaxis.

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.