Previously claimed stable solid aryldiazoisocyanides were found to be crude arylazides, and dehydration of formamides as a route to stable N-isocyanides must be viewed with caution; stable N-formyltriazenes are confirmed and literature difficulties with reproducible syntheses are explained.
R. N. Butler, P. D. O'Shea and L. A. Burke, J. Chem. Soc., Chem. Commun., 1987, 1210 DOI: 10.1039/C39870001210
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