Abstract The equilibrium concentrations of E-and Z-isomers of thiazolidin-4-ones containing exocyclic double bonds in positions 2 and 5 of the cycle were determined in DMSO-d 6. The influence of the nature of the substituents on the equilibrium position was found. Electron- releasing substituents stabilize the E, Z-configuration and electron-withdrawing substituents stabilize the Z, Z-configuration. The association constants of E-and Z-2- ...
