The azides (3) are stabilised in the open-chain form by a slow Z–E isomerisation about the C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
N bond; electron-withdrawing substituents in Ar2 can either lower (by the operation of a mesomeric effect) or raise (by the inductive effect) this inversion barrier.
A. F. Hegarty, K. Brady and M. Mullane, J. Chem. Soc., Chem. Commun., 1978, 871 DOI: 10.1039/C39780000871
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