Abstract

I. Attia, M. A. Sayed and S. El-Nagdy

3-phenyl hydantoin and thiohydantoin derived from S-methyl and S-ethyl L-cysteine were prepared. 1H-NMR spectra showed well resolved ABX system for these compounds. Using calculated values of the vicinal coupling constants 3J/H∝ Hβ/ the amounts of conformers on the C∝—βC bond were estimated. The stabilized conformer is folded one (F). An investigation of the compounds at different temperatures led to calculate the thermodynamic parameters for the conformational equilibria on the C∝—βC bond.

Studies; S-Methyl; S-Ethyl; L-Cysteine

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