SCHEDULED MAINTENANCE
Cycloaddition of p-chlorobenzonitrile oxide takes place only at the C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
P bond of the diazaphosphole (1) yielding one regioisomer (3), and at the CAs bond of the diaza-arsole (4) yielding the analogous regioisomer (5) as the kinetic product, the other regioisomer (6) being the thermodynamic product.
R. Carrié, Y. Y. C. Y. L. Ko, F. De Sarlo and A. Brandi, J. Chem. Soc., Chem. Commun., 1981, 1131 DOI: 10.1039/C39810001131
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