Carbon‐13 and proton nuclear magnetic resonance studies of (E)‐ and (Z)‐ azetidinones

Abstract Carbon‐13 and proton NMR spectra of a variety of E and Z pairs of mono‐ and bi‐cyclic polysubstituted azetidinones have been measured. The effect of E/Z isomerism on the chemical shift values of ring carbon atoms and of proton substituents attached to the azetidinone nucleus is discussed.