A green and highly efficient cooperative photocatalytic system which consists of riboflavin tetraacetate (RFT), N-hydroxysuccinimide (NHS) and FeCl₃·6H₂O has been developed for CH bond oxygenation with visible light under mild reaction conditions. Compared to the previous procedures about CH bond activation by using flavins as photocatalyst, we use cheap ferric chloride and NHS instead of expensive scandium triflate or biomimetic non-heme iron complex, further expand the substrate scopes. In addition, a possible radical mechanism for the CH bond oxygenation in this photocatalytic system is proposed.

中文翻译：

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可见光介导的四乙酸核黄素和N-羟基琥珀酰亚胺对C H键的需氧光催化活化

已经开发了一种绿色高效的协同光催化体系，该体系由四乙酸核黄素（RFT），N-羟基琥珀酰亚胺（NHS）和FeCl ₃ ·6H ₂ O组成，用于在温和的反应条件下用可见光进行C H键氧合。与以前使用黄素类化合物作为光催化剂活化C H键的方法相比，我们使用便宜的氯化铁和NHS代替了昂贵的三氟甲磺酸scan或仿生非血红素铁络合物，进一步扩大了底物的范围。另外，提出了在该光催化体系中CH键氧化的可能的自由基机理。