A simple, metal- and oxidant-free photo catalysis strategy for the direct trifluoromethylation of coumarins with inexpensive sodium triflinate (Langlois reagent, CF₃SO₂Na) as the CF₃ source under xenon lamp irradiation is described. The reaction proceeds under ambient conditions and affords the corresponding products in moderate yields. The acetone can be used as low-cost radical initiator to generate CF₃ radicals from sodium triflinate efficiently.

中文翻译：

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香豆素的绿色和无过渡金属的光介导的三氟甲基化反应

描述了一种简单，无金属和氧化剂的光催化策略，用于在氙气灯照射下，使用廉价的三氟甲酸钠（Langlois试剂，CF ₃ SO ₂ Na）作为CF ₃源直接对香豆素进行三氟甲基化。反应在环境条件下进行，并以中等收率得到相应的产物。丙酮可用作低成本的自由基引发剂，可从三氟甲磺酸钠高效生成CF ₃自由基。