The identification by electron spin resonance spectroscopy of dimeric species formed in the autoxidation of hydroquinone and quinone

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Abstract
Some of the e.s.r. spectra observed during the autoxidation of hydroquinone and quinone appear to arise from the formation of dimeric products in the reaction since these spectra can be obtained from diquinone under similar conditions. The hyperfine splittings in these types of radicals can be explained in terms of the oxidation states of the two quinonoid rings.