Intramolecular cyclisation of o-phenylphenoxymethyl radicals, formed by persulphate oxidation of o-phenylphenoxyacetic acid, yields cyclohexadienyl radicals which are either oxidised to dibenzopyran and a related bis-acetal, or dimerise.
P. S. Dewar, A. R. Forrester and R. H. Thomson, J. Chem. Soc. D, 1970, 850 DOI: 10.1039/C29700000850
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