Synthesis and dynamic 13C NMR study of new system containing polarised carbon-carbon double bonds from reaction between cyclohexyl isocyanide and ethyl propiolate in the presence of N,N'-dimethvlbarbituric acid

The adduct produced in the reaction between cyclohexyl isocyanide and ethyl acetylenecarboxylate was trapped by N, N'-dimethylbarbituric acid. Dynamic NMR effects were observed in the NMR spectra of these compounds and were attributed to restricted rotation around the alkyl-nitrogen single bonds and the polarised carbon-carbon double bond.