A mechanism for the novel radical spirocyclisation reaction 1→2 is proposed, and is shown by isotopic labelling to involve transfer of oxygen from an aromatic nitro function to carbon in a cyclohexadienyl radical.
U. P. Topiwala and D. A. Whiting, J. Chem. Soc., Chem. Commun., 1994, 2443 DOI: 10.1039/C39940002443
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