Horseradish peroxidase catalyzed polymerization of 8‐hydroxyquinoline‐5‐sulfonate (HQS) has been studied by in‐situ NMR spectroscopy. The 2, 4 and 7 positions of the HQS are involved in oxidative free radical coupling with other HQS molecules with the order of reactivity being 7 ≥ 2 > 4. A mechanism for the oxidative free radical coupling and structure of the resulting polymer is proposed, which is supported by 13C NMR spectroscopy.
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Alva et al. (1997) studied this question.
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