Although iodine-catalyzed reaction has rapid advances in recent years, examples on iodine-catalyzed bromination are rare and the mechanism of these reactions remains unclear. Herein, we reported an I₂-catalyzed aromatic bromination of aryl ethers by NBS and presented the details of the mechanistic study including kinetic study and the study of kinetic isotope effects. The study revealed that the reaction was actually catalyzed by IBr formed in the induction period, and the rate-determining step was the HBr-elimination of the Wheland intermediate assisted by IBr.

中文翻译：

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N-溴代琥珀酰亚胺碘催化芳基醚芳族溴化反应的机理

尽管近年来碘催化的反应发展迅速，但是碘催化溴化的例子很少，这些反应的机理尚不清楚。在本文中，我们报道了NBS的I ₂催化的芳基醚的芳族溴化反应，并详细介绍了包括动力学研究和动力学同位素效应在内的机理研究。研究表明，该反应实际上是由诱导期形成的IBr催化的，而决定速率的步骤是在IBr辅助下消除Wheland中间体的HBr。