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Irradiation of quinoxaline (1) in acidic aqueous solution under anaerobic conditions leads to the formation of 5‐hydroxyquinoxaline (4) and the 1,4‐dihydroquinoxaline radical cation (5). The radical cation (5) was characterized by ESR spectroscopy. Under aerobic conditions 5‐hydroxyquinoxaline (4) is the only irradiation product formed. The effect of substituents attached to the benzene nucleus of quinoxaline is analyzed.
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Verbeek et al. (1976) studied this question.
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