(Z)-3-(4-Methyl-phen-yl)-2-[(2-phenyl-cyclo-hex-2-en-1-yl)imino]-1,3-thia-zol-idin-4-one

(Z)-3-Benzyl-2-[(2-phenyl-cyclo-hex-2-en-yl)imino]-1,3-thia-zolidin-4-one

The title compound, C(22)H(22)N(2)OS, exists in a Z configuration with respect to the N=C bond. The cyclo-hexene ring adopts a distorted sofa conformation. The thia-zolidine ring is essentially planar, with a maximum deviation of 0.030 (2) Å, and forms dihedral angles of 76.66 (6) and 74.55 (6)° with the terminal phenyl rings. The dihedral angle between the phenyl rings is 71.55 (7)°. In the crystal, a C-H⋯π inter-action is observed.

(Z)-3-(4-Bromo-phen-yl)-2-[(2-phenyl-cyclo-hex-2-en-1-yl)imino]-1,3-thia-zol-idin-4-one

The title compound, C₂₁H₁₉BrN₂OS, exists in a cis conformation with respect to the N=C bond [1.2602 (14) Å]. The cyclo­hexene ring adopts a distorted half-chair conformation and the C—N bond lies in an equatorial orientation. The thia­zolidine ring forms dihedral angles of 53.76 (7) and 57.22 (7)° with the benzene and bromo-substituted benzene rings, respectively. The dihedral angle between the benzene and bromo-substituted benzene rings is 76.06 (7)°. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R₂²(14) loops. The crystal is further consolidated by weak C—H⋯π inter­actions.

(Z)-3-(4-Chloro-phen-yl)-2-(2-phenyl-cyclo-hex-2-en-1-yl-imino)-thia-zolidin-4-one

The title compound, C₂₁H₁₉ClN₂OS, exists in a cis conformation with respect to the N=C bond [1.2608 (13) Å]. The cyclo­hexene ring adopts a distorted half-chair conformation. The thia­zolidine ring is close to being planar (r.m.s. deviation = 0.057 Å) and makes dihedral angles of 62.92 (6) and 56.32 (6)°, respectively, with the benzene ring and the chloro-substituted benzene ring. The dihedral angle between the benzene ring and the chloro-substituted benzene ring is 72.91 (6)°. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯N hydrogen bonds into undulating sheets lying parallel to the bc plane. The crystal is further consolidated by C—H⋯π inter­actions.