Single resonance 13C Fourier transform n.m.r. spectra of the title compounds are described. It is shown that the pattern of fine splitting caused by long-range 13C–1H couplings together with the 1J values provides a means of differentiating 13C nuclei in the system NCH213CH2X, where X =![[double bond splayed left]](https://www.rsc.org/images/entities/char_e009.gif)
C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
O, NH, NMe, or O.
Y. Takeuchi, J. Chem. Soc., Perkin Trans. 2, 1974, 1927 DOI: 10.1039/P29740001927
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