The dihydro-1,2,4-triazole (2), prepared by oxidation of the amidrazone (1), reacts with acrylonitrile and with sulphene (CH2![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
SO2) to afford spiroaziridines (5) and (6), respectively.
A. L. Schwan and J. Warkentin, J. Chem. Soc., Chem. Commun., 1986, 1721 DOI: 10.1039/C39860001721
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