3-[(4-Oxo-4H-thio­chromen-3-yl)meth­yl]-4H-thio­chromen-4-one

The title mol­ecule, C₁₉H₁₂S₂O₂, lies on a twofold rotation axis. The thio­chromonone unit is essentially planar, with a maximum deviation of 0.0491 (14) Å. The dihedral angle between the thio­chromenone ring systems is 64.48 (4)°. In the crystal, there are weak π–π stacking inter­actions, with a centroid–centroid distance of 3.7147 (9) Å.

rac-7-Methyl-3-[(7-methyl-4-oxo­chro­man-3-yl)meth­yl]-4H-chromen-4-one

In the racemic title compound, C₂₁H₁₈O₄, the chromone ring is essentially planar [maximum deviation from the least-squares plane = 0.026 (3) Å], with a dihedral angle of 78.18 (12)° between the benzene rings of the chromanone and chromenone moieties. In the crystal, there are weak π–π stacking inter­actions [minimum ring centroid separation = 3.9286 (17) Å].

(2E,4E)-Ethyl 5-(2,4-di­chloro­phenyl­sulfon­yl)penta-2,4-dienoate

In the title compound, C₁₃H₁₂Cl₂O₄S, both C=C double bonds adopt an E conformation. The S atom has a distorted tetra­hedral geometry with bond angles ranging from 103.03 (12) to 118.12 (13)°. The eth­oxy­carbonyl group is disordered over two sets of sites, with site-occupancy factors of 0.739 (11) and 0.261 (11). In the crystal, C—H...O inter­actions link the mol­ecules into chains mol­ecules running parallel to the a axis.