In the title compound, C16H16ClNO2S2, the piperidine ring is in a chair conformation. In the coumarin ring system, the dihedral angle between the benzene and pyran rings is 3.5 (1)°. In the crystal, a weak C—H...O hydrogen bond links molecules into chains along [001]. In addition, π–π stacking interactions are present involving the benzene and pyran rings, with a centroid-to-centroid distance of 3.712 (2) Å. The crystal studied is a nonmerohedral twin with refined components 0.221 (1) and 0.779 (1)

In the title compound, C16H17NO3S2, the 2H-chromene ring is close to being planar [maximum deviation = 0.034 (2) Å] and the pyrrolidine ring is twisted about the C—C bond opposite the N atom. The dihedral angle between the ring-system planes is 75.24 (16)° and an intra­molecular C—H⋯S inter­action occurs. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds and the packing also exhibits π–π inter­actions, with a distance of 3.6106 (13) Å between the centroids of the benzene rings of neighbouring mol­ecules.

In the title compound, C19H17NO3S2, the morpholine ring is in a chair conformation. In the coumarin ring system, the dihedral angle between the benzene and pyran rings is 3.9 (1)°. In the crystal, weak C—H⋯O inter­actions link the mol­ecules into corrugated layers parallel to (102). The crystal packing also exhibits π–π inter­actions, with distances of 3.644 (1) and 3.677 (1) Å between the centroids of the benzene rings of neighbouring mol­ecules.

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

In the title compound, C16H17NO4S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.070 (1) Å, and the morpholine ring adopts a chair conformation; the bond-angle sum for its N atom is 357.9°. The dihedral angle between the the 2H-chromene ring and the best plane through the morpholine ring is 89.09 (6)°. An intra­molecular C—H⋯S hydrogen bond occurs. In the crystal, C—H⋯O hydrogen bonds generate R 2 2(8) rings and π–π inter­actions occur between fused benzene rings of the chromene system [shortest centroid–centroid distance = 3.5487 (8) Å].