14 N NMR spectroscopy provides a powerful tool to distinguish easily nitrile imides from the isomeric diazo compounds; the chemical shift variations of the Nα resonance reflect the electronic interaction between the substituents and the nitrile imide skeleton (–CNαNβ–).
K. H. von Locquenghien, R. Réau and G. Bertrand, J. Chem. Soc., Chem. Commun., 1991, 1192 DOI: 10.1039/C39910001192
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