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This paper presents the first report of a highly selective transformation of flavanones to 3‐bromoflavones or flavones by microwave irradiation of the corresponding flavanone reactants and N‐bromosuccinimide (NBS) in the presence of a catalytic amount of 2,2′‐azobis(isobutyronitrile) (AIBN). The combination of good to excellent yields, shorter reaction time (10 min), and high levels of functional group compatibility make this an attractive synthetic approach to 3‐bromoflavones and flavones.
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Zhou et al. (2006) studied this question.
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