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The title compounds 2-tri-chloro-methyl-3-phenyl-1,3-thia-zolidin-4-one (C 10 H 8 Cl 3 NOS), 1 and 3-(4-chloro-phen-yl)-2-tri-chloro-methyl-1,3-thia-zolidin-4-one (C 10 H 7 Cl 4 NOS) 2 , are structurally related with one atom substitution difference in the para position of the benzene ring. In both structures, the thia-zolidinone ring adopts an envelope conformation with the S atom as the flap. The dihedral angles between the rings [48.72 (11) in 1 and 48.42 (9)° in 2 ] are very similar and the mol-ecules are almost superimposable. In both crystal structures, C-H⋯O 'head-to-tail' inter-actions between the chiral carbon atoms and the thia-zolidinone oxygen atoms result in infinite monochiral chains along the direction of the shortest unit-cell parameter, namely a in 1 and b in 2 . C-H⋯π inter-actions between the thia-zolidinone carbon atom at the 4-position and the phenyl ring of the neighboring enanti-omer also help to stabilize the packing in each case, although the crystals are not isostructural.

Crystal structures of two thiazolidinone derivatives bearing a trichloromethyl substituent at the 2-position