Abstract
Nuclear magnetic resonance studies showed that ethyl <i>N</i>-substituted carbamates are present as single isomers in either deuterated chloroform or dimethylsulfoxide solvents. The thioncarbamates exist as <i>cis-trans</i> isomer mixtures. The polar and resonance character of the substituent affects the shielding and thus the chemical shift of the amide proton.
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