Low-temperature carbon-13 n.m.r. spectra of NN-dimethylaminophosphines show the two-bond coupling constant 2JPNC to be large and positive when the CN bond is cis with respect to the phosphorus lone pair, whilst it becomes small and negative in the trans-conformation.
M. Simonnin, R. Lequan and F. W. Wehrli, J. Chem. Soc., Chem. Commun., 1972, 1204 DOI: 10.1039/C39720001204
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