Nitrogen‐15 NMR spectra of 11 ketenimines have been taken both at the natural‐abundance level of 15N and with the aid of 15N‐labeling. The nitrogen chemical shifts are substantially different from those of neutral imines and are upfield, more like those of protonated imines. The results are in accord with significant delocalization of the nitrogen lone‐pair. Furthermore, there is a rough parallelism between the 13C shifts of the terminal carbons and the 15N shifts.
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Eberl et al. (1981) studied this question.
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