(E)-2,2′-[3-(4-Fluoro­phen­yl)prop-2-ene-1,1-di­yl]bis­(3-hy­droxy-5,5-dimethyl­cyclo­hex-2-en-1-one)

In the title compound, C₂₅H₂₉FO₄, each cyclo­hexenone ring has an envelope conformation with the dimethyl-substituted atom as the flap. The hy­droxy and carbonyl groups form two intra­molecular O—H...O hydrogen bonds, as is typical for xanthene derivatives. In the crystal, very weak C—H...O hydrogen bonds link mol­ecules into dimers.

(E)-2,2′-[3-(4-Chloro­phen­yl)prop-2-ene-1,1-di­yl]bis­(3-hy­droxy-5,5-di­methyl­cyclo­hex-2-en-1-one)

The title compound, C₂₅H₂₉ClO₄, adopts a trans conformation about the C=C double bond and the di­methyl­cyclo­hexenone rings both show an envelope conformation with the dimethyl-substituted C atom as the flap. In the mol­ecule, the hy­droxy and carbonyl groups form two intra­molecular O—H...O hydrogen bonds typical for xanthene derivatives. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains running parallel to the a-axis direction.