Crystal structure of (Z)-3-allyl-5-(4-chloro-benzyl-idene)-2-sulfanyl-idene-1,3-thia-zolidin-4-one

In the title compound, C13H10ClNOS2, the dihedral angle between the rhodanine (r.m.s. deviation = 0.008 Å) and 4-chloro-benzyl-idene rings is 1.79 (11)°. The allyl group attached to the N atom, which lies almost perpendicular to the rhodanine ring, is disordered over two orientations in a 0.519 (13):0.481 (13) ratio. A short intra-molecular C-H⋯S inter-action closes an S(6) ring. In the crystal, mol-ecules are linked by π-π stacking inter-actions [centroid-centroid separation = 3.600 (15) Å], generating inversion dimers.

Crystal structure of (Z)-3-allyl-5-(4-methyl-benzyl-idene)-2-sulfanyl-idene-1,3-thia-zolidin-4-one

In the title compound, C14H13NOS2, the atoms of the allyl group are disordered over two sets of sites, with an occupancy ratio of 0.559 (10):0.441 (10). The rhodanine ring makes a dihedral angle of 5.51 (12)° with the mean plane through the p-tolyl group. There are no specific inter-molecular inter-actions in the crystal packing.

Crystal structure of (±)-3-[(benzo[d][1,3]dioxol-5-yl)meth-yl]-2-(3,4,5-tri-meth-oxy-phen-yl)-1,3-thia-zolidin-4-one

In the title thia-zolidine-4-one derivative, C20H21NO6S, the central thia-zolidine ring is essentially planar (r.m.s. deviation for all non-H atoms = 0.0287 Å) and forms a dihedral angle of 88.25 (5)° with the meth-oxy-substituted benzene ring and 74.21 (4)° with the 1,3-benzodioxole ring. The heterocyclic ring (with two O atoms) fused to benzene ring adopts an envelope conformation with the non-ring-junction C atom as the flap. In the crystal, the mol-ecules are linked into chains along [001] through weak C-H⋯O inter-actions, forming R (4) 4(28) edge-fused rings.