(6-Meth-oxy-2-oxo-2H-chromen-4-yl)methyl piperidine-1-carbodi-thio-ate.

In the title compound, C17H19NO3S2, the maximum deviation of atoms in the 2H-chromene ring system is 0.0097 (14) Šand the piperidine ring adopts a chair conformation. The dihedral angle between the 2H-chromene ring and the piperidine ring (all atoms) is 87.59 (8)°. In the crystal, inversion dimers linked by pairs of C-H⋯O inter-actions generate R 2 (2)(22) loops. Further C-H⋯O hydrogen bonds link the dimers into [110] chains and weak aromatic π-π stacking [shortest centroid-centroid distance = 3.824 (8) Å] is also observed.

(7-Chloro-2-oxo-2H-chromen-4-yl)methyl pyrrolidine-1-carbodi-thio-ate.

In the title compound, C15H14ClNO2S2, the 2H-chromene ring system is essentially planar, with a maximum deviation of 0.0133 (10) Å. Three C atoms and their attached H atoms of the pyrrolidine ring are disordered [occupany ratio 0.874 (7):0.126 (7)] with both disorder components adopting a twisted conformation. The dihedral angle between the 2H-chromene ring system and the major occupancy component of the pyrrolidine ring is 89.45 (7)°. In the crystal, inversion dimers linked by pairs of C-H⋯S and C-H⋯O inter-actions generate R (2) 2(24) and R (2) 2(10) loops, respectively. Further C-H⋯O hydrogen bonds link the dimers into [100] chains. C-H⋯π inter-actions also occur and there is very weak π-π stacking [inter-planar spacing = 3.650 (5) Å; centroid-centroid distance = 4.095 (7) Å] between inversion-related chloro-benzene rings.

2-Oxo-2-(2-oxo-2H-chromen-3-yl)ethyl pyrrolidine-1-carbodi-thio-ate.

There are two independent mol-ecules in the asymmetric unit of the title compound, C16H15NO3S2, in which the pyrrolidine rings adopt envelope conformations, with a methyl-ene C atom as the flap. The dihedral angles betweeen the near-planar 2H-chromene ring systems [maximum deviations = 0.0167 (20) and 0.0136 (19) Å] and the pyrrolidine rings (all atoms) are 83.83 (11) and 82.43 (11)°. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds occur for one of the mol-ecules. Further C-H⋯O links involving both mol-ecules generate a three-dimensional network.

Crystal structure of (7-chloro-2-oxo-2H-chromen-4-yl)methyl N,N-di-methyl-carbamodi-thio-ate.

In the title compound, C13H12Cl N O2S2, the 2H-chromene ring system is almost planar, with a maximum deviation of 0.005 (2) Å. The packing features C-H⋯S hydrogen bonds and π-π inter-actions between fused benzene rings of chromene [shortest centroid-centroid distances = 3.6553 (13) and 3.5551 (13) Å].