The e.s.r. spectra of radicals formed in the autoxidation of arylhydroquinones show hyperfine splitting from protons attached to the aryl group, showing that the odd electron is delocalised over both rings. Substituents on the phenyl group influence the various proton coupling constants in a way which is related to their electron-donating or electron-withdrawing properties.
P. Ashworth and W. T. Dixon, J. Chem. Soc., Perkin Trans. 2, 1972, 2264 DOI: 10.1039/P29720002264
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