Alkene-attached oxygen radicals are rarely used, as highly reactive oxygen radicals are incompatible with the alkene moiety. The direct radical–radical cross-coupling of O radicals is also challenging (limited to N–O bond formation) because of the lack of suitable persistent radical species. This study demonstrated the feasibility of using Breslow intermediate radical (BIR) as a persistent radical to capture unstable π-conjugated O radicals and allow the C–O radical–radical cross-coupling.

中文翻译：

---

烯氧基自由基的生成和自由基-自由基交叉偶联

烯烃连接的氧自由基很少使用，因为高反应性氧自由基与烯烃部分不相容。由于缺乏合适的持久性自由基种类，O自由基的直接自由基-自由基交叉偶联也具有挑战性（仅限于N-O键的形成）。这项研究证明了使用 Breslow 中间自由基 (BIR) 作为持久自由基来捕获不稳定的 π-共轭 O 自由基并允许 C-O 自由基-自由基交叉偶联的可行性。