Nitrocatechols and nitrohydroquinone have been treated by means of sodium borohydride in oxygenated aqueous solution in a pH range between 9 to 12, and the EPR spectra have been recorded. In all cases, the nitroaromatic anion radical is observed. At pH=12, a semiquinonic radical is observed in the case of nitrohydroquinone and 4- nitrocatechol.
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Grenier et al. (1995) studied this question.