Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.039; wR factor = 0.091; data-to-parameter ratio = 15.1.In the title compound, C 15 H 16 ClNO 2 S 2 , the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.023 (2) Å . In the crystal, C-HÁ Á ÁO hydrogen bonds give R 2 1 (7) motifs, which generate [100] chains. C-HÁ Á Á andinteractions between chromene moieties [shortest ring centroid-centroid distance = 3.6199 (13) Å ] consolidate the packing. Related literature

The title compound, C19H20O4, was synthesized via a Fries rearrangement of hydr­oxy benzophenone. The dihedral angle between the least-squares planes of the two benzene rings is 69.04 (11)°. The mol­ecular structure displays an intra­molecular non-classical C—H⋯O hydrogen bond.

In the title compound, C15H11BrO3, the dihedral angle between the benzene rings is 72.59 (6)°. In the crystal, pairs of C—H⋯π contacts form inversion dimers. Additional C—H⋯O hydrogen bonds generate R 2 1(6) ring motifs and stack these dimers along the b axis. Short inter­molecular Br⋯O contacts of 3.254 (3) Å are also observed and link the stacks into a three-dimensional network.

In the title compound, C23H26FN3O6S, the two terminal aromatic rings form a dihedral angle of 49.26 (12)°. The cyclo­hexane ring adopts a chair conformation and the five-membered ring is essentially planar, with a maximum deviation from planarity of 0.0456 (19) Å. The dihedral angles between the five-membered ring and the meth­oxy­benzene and fluoro­benzene rings are 33.56 (11) and 81.94 (12)°, respectively. The crystal structure displays N—H⋯O hydrogen bonds as well as weak inter­molecular C—H⋯O inter­actions.