A protocol for the C–H activation/iodination of benzoic acids catalyzed by a simple iridium complex has been developed. The method described in this paper allows the ortho-selective iodination of a variety of benzoic acids under extraordinarily mild conditions in the absence of any additive or base in 1,1,1,3,3,3-hexafluoroisopropanol as the solvent. The iridium catalyst used tolerates air and moisture, and selectively gives ortho-iodobenzoic acids with high conversions. Mechanistic investigations revealed that an Ir(III)/Ir(V) catalytic cycle operates, and that the unique properties of HFIP enables the C–H iodination using the carboxylic moiety as a directing group.

中文翻译：

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苯甲酸的无碱和无添加剂Ir催化邻位碘化：范围和机理研究

已经开发了一种由简单铱络合物催化的苯甲酸的C–H活化/碘化的方案。本文描述的方法允许在非常温和的条件下，在没有任何添加剂或碱的情况下，在1,1,1,3,3,3-六氟异丙醇作为溶剂中对多种苯甲酸进行邻位碘化。所用的铱催化剂可耐受空气和湿气，并选择性地以高转化率得到邻碘苯甲酸。机理研究表明，Ir（III）/ Ir（V）催化循环起作用，并且HFIP的独特性质使得能够使用羧基作为引导基团进行C-H碘化。