When phthalein dyes are oxidised by alkaline hydrogen peroxide within the cavity of an e.s.r. spectrometer then the spectra of substituted p-benzosemiquinone radicals can be observed. This shows that oxidation occurs by HO2– attack and Dakin rearrangement to break off one phenolic ring as a p-benzoquinol, leaving a substituted benzophenone.
E. McKeown and W. A. Waters, J. Chem. Soc. B, 1966, 679 DOI: 10.1039/J29660000679
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