(5,7-Dimethyl-2-oxo-2H-chromen-4-yl)methyl pyrrolidine-1-carbodithio-ate.

In the title compound, C(17)H(19)NO(2)S(2), the 2H-chromene ring system is almost planar, with a maximum deviation of 0.044 (2) Å, and the pyrrolidine ring adopts an envelope conformation. The dihedral angle between the 2H-chromene system and the planar part of the pyrrolidine ring is 83.65 (8)°. A weak intra-molecular C-H⋯S hydrogen bond occurs. The crystal structure features C-H⋯O hydrogen bonds and π-π inter-actions, with a centroid-centroid distance of 3.5728 (16) Å.

(6-Meth-oxy-2-oxo-2H-chromen-4-yl)methyl pyrrolidine-1-carbodithio-ate.

In the title compound, C(16)H(17)NO(3)S(2), 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 intra-molecular C-H⋯S inter-action occurs. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds and the packing also exhibits π-π inter-actions, with a distance of 3.6106 (13) Šbetween the centroids of the benzene rings of neighbouring mol-ecules.

(2E)-1-(5-Bromo-thio-phen-2-yl)-3-(2,3,4-trimeth-oxy-phen-yl)prop-2-en-1-one.

In the title compound, C(16)H(15)BrO(4)S, the thio-phene ring is not coplanar with the benzene ring; the dihedral angle between the two planes is 11.08 (12)°. The crystal structure is characterized by C-H⋯O inter-actions. Weak intra-molecular C-H⋯O hydrogen bonds also occur.

(E)-1-(5-Bromo-thio-phen-2-yl)-3-(3,4,5-trimeth-oxy-phen-yl)prop-2-en-1-one.

In the title compound, C(16)H(15)BrO(4)S, the dihedral angle between the thio-phene and benzene rings is 13.08 (16)°. The C atoms of the meta meth-oxy groups of the substituted benzene ring lie close to the plane of the ring [displacements = 0.049 (5) and -0.022 (4) Å], whereas the para-C atom is significantly displaced [-1.052 (4) Å]. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds, forming C(11) chains propagating in [100].

4-(Benz-yloxy)phenyl 4-hexa-dec-yloxy-3-meth-oxy-benzoate.

In the title compound, C(37)H(50)O(5), the central benzene ring makes dihedral angles of 39.72 (14) and 64.43 (13)° with the benzyl and 3-meth-oxy-benzoate rings, respectively. The crystal structure is stabilized by inter-molecular C-H⋯π inter-actions involving the central benzene ring and the benzene ring closest to the aliphatic chain.