(5,7-Dimethyl-2-oxo-2H-chromen-4-yl)methyl diethyl-dithio-carbamate

(6-Bromo-2-oxo-2H-chromen-4-yl)methyl diethylcarbamodithioate

In the title compound, C15H16BrNO2S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.0182 (22) Å. In the crystal, π–π interactions between pyran and benzene rings of chromene [shortest centroid–centroid distance = 3.7588 (14) Å] occur.

Ethyl (4-{[(diethylcarbamothioyl)sulfanyl]methyl}-2-oxo-2H-chromen-7-yl)carbamate

In the title compound, C₁₈H₂₂N₂O₄S₂, the 2H-chromene ring system is essentially planar (r.m.s. deviation = 0.012 Å). The mol­ecular conformation is stabilized by a C—H⋯O hydrogen bond. In the crystal, N—H⋯S and C—H⋯O hydrogen bonds occur, the former enclosing an R²₂(22) ring motif, and lead to the formation of a two-dimensional slab-like network lying parallel to (10-1). π–π inter­actions are observed between inversion-related aromatic rings [shortest centroid–centroid distance = 3.6300 (11) Å].

2-Oxo-2-(2-oxo-2H-chromen-3-yl)ethyl di-ethyl-dithio-carbamate

In the title compound, C₁₆H₁₇NO₃S₂, the dihedral angles between the O/C/C/S group and the 2H-chromene ring system and the thio­carbamate group are 14.46 (9) and 83.30 (9)°, respectively. The bond-angle sum at the N atom is 360.0°. One of the methyl C atoms lies above the thio­carbamate plane and one lies below it [deviations = 1.264 (3) and −1.147 (3) Å, respectively]. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R₂²(10) loops. Weak aromatic π–π stacking inter­actions [shortest centroid–centroid distance = 3.8138 (11) Å] are also observed.

(3-Oxo-3H-benzo[f]chromen-1-yl)methylN,N-dimethylcarbamodithioate

In the title compound, C₁₇H₁₅NO₂S₂, the 3H-benzo[f]chromene ring system is distinctly twisted; the dihedral angle between the pyran ring and its opposite benzene ring is 9.11 (8)°. The N,N-dimethyl­carbamodithio­ate residue lies almost perpendicular to the pyran ring [dihedral angle = 85.15 (7)°]. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into C(10) chains propagating in [001].