Dimethyl 3,4,5,5-tetraphenyl-1,3-thiazolidine-2,2-dicarboxylate and 3,3-dichloro-2,2,4,4,3'-pentamethyl-r-2',t-4'-diphenylcyclobutane-1-spiro-5'-1,3-thiazolidine.

The first of the title compounds, C31H27NO4S, (V), crystallizes in the monoclinic space group P21/c with two independent mol­ecules in the asymmetric unit, while the second, C23H27Cl2NS, (IX), crystallizes in the orthorhombic space group Pbca with one mol­ecule in the asymmetric unit. In both crystal structures, the 1,3-thia­zolidine ring adopts a half-chair conformation. The crystal structures are stabilized by weak C—H⋯O and C—H⋯Cl hydrogen bonds in (V) and (IX), respectively.

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