Enamine chemistry. Part 22. Carbon-13 nuclear magnetic resonance spectra of acyclic enamines

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Abstract
The 13C chemical shifts of a series of acyclic enamines derived from morpholine and pyrrolidine are reported. There is considerable variation in the contribution of the amine moiety to the chemical shift of the olefinic C-2, which is attributed principally to variation in the mesomeric contribution to the electron density. The amine contribution to the chemical shift of the olefinic C-1 is relatively constant if allowance is made for changes in the shift parameters of the alkyl substituents.