Mild oxidation of amidine (1) bearing two sterically crowded phenol moieties leads to the formation of the dispirocyclohexadienone derivative (6) of pyrrolidin-2,5-dione N-arylamine through an intramolecular ring closure recombination of the intermediate biradical (4).
V. I. Minkin, E. P. Ivachnenko, A. I. Shif, L. P. Olekhnovitch, O. E. Kompan, A. I. Yanovskii and Y. T. Struchkov, J. Chem. Soc., Chem. Commun., 1988, 990 DOI: 10.1039/C39880000990
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