3-(3-Meth­oxy­benzyl­idene)chroman-4-one

In the title compound, C₁₇H₁₄O₃, the dihedral angle between the meth­oxy­benzene unit and the benzene ring of the chromanone system is 64.12 (3)°. The crystal structure is stabilized by weak C—H...O inter­actions.

(E)-3-(4-Cyclo­hexyl-3-fluoro­benzyl­idene)chroman-4-one

The title compound, C₂₂H₂₁FO₂, exhibits substitutional disorder of the F atom and a H atom in the asymmetric unit with different occupancies, the refined F:H ratio being 0.80 (2):0.20 (2). The dihedral angle between the fluorinated benzene ring and the benzene ring of the chromanone system is 37.30°. There are two relatively high residual electron-density peaks associated with the disorder.

1-(5-Hy­droxy-2,2,8,8-tetra­methyl-2H,8H-pyrano[2,3-f]chromen-6-yl)ethanone

In the title compound, C₁₈H₂₀O₄,the pyran ring of the chromene unit adopts a half-chair conformation. An intra­molecular O—H...O hydrogen bond occurs. In the crystal, mol­ecules are linked along the b axis by C—H...O hydrogen bonds.

2-Acetyl­phenyl (2E)-3-(4-fluoro­phen­yl)acrylate

In the title compound, C₁₇H₁₃FO₃, the dihedral angle between the benzene rings is 70.34 (5)°. In the crystal, molecules are linked via pairs of bifurcated C—H...(O,O) hydrogen bonds, forming inversion dimers. These dimers are linked via C—H...O and C—H...F inter­actions, forming a three-dimensional structure.

3-(3,4-Dichloro­benzyl­idene)chroman-4-one

The distinctive feature of the structure of the title compound, C₁₆H₁₀Cl₂O₂, is the formation of a zigzag chain along [100] via Cl...Cl inter­actions [3.591 (1) and 3.631 (1) Å]. The chroman­one moiety is fused with the benzene ring and adopts a half-chair conformation. The dihedral angle between the benzene ring of the chromanone moiety and the dichlorobenzene plane is 56.14 (8)°.