The equilibration of three 5-arylcyano-methylene-3,4-dimethylpyrrolidin-2-ones in alkaline methanolic solutions by exchange of the C-3 hydrogen atoms yields different [cis]/[trans] ratios for C-3-protiothan for the C-3 deuterio-compounds.
J. M. Ribó and A. Vallès, J. Chem. Soc., Chem. Commun., 1981, 205 DOI: 10.1039/C39810000205
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