Pentamethylcyclopentadienyl (Cp*)‐based Group 9 metal (Co, Rh, or Ir) catalysts have emerged as powerful tools for C−H functionalization reactions. Whilst a diverse range of organic transformations have been developed by using [Cp*M^III] catalysts, they have often exhibited orthogonal reactivities and varied selectivities that depended on the choice of the central metal atom. An understanding of the physicochemical properties of the metals, as well as of their reaction mechanisms, has led to significant expansion of the synthetic scope of C−H functionalization reactions. This Focus Review summarizes and discusses the comparative catalytic reactivities and selectivities of the [Cp*M^III] catalysts, with an emphasis on metal‐dependent pathway‐switching by considering the mechanistic rationale.

中文翻译：

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比较第9组[Cp * MIII]催化剂在CH功能化反应中的反应性和选择性

基于五甲基环戊二烯基（Cp *）的第9组金属（Co，Rh或Ir）催化剂已成为CHH功能化反应的有力工具。尽管通过使用[Cp * M ^III ]催化剂已经开发了多种有机转化，但它们通常表现出正交反应性和取决于中心金属原子选择的不同选择性。对金属的物理化学性质及其反应机理的了解已导致CH官能化反应合成范围的显着扩大。本重点综述总结并讨论了[Cp * M ^III]的比较催化反应性和选择性]催化剂，并通过考虑机理原理来强调金属依赖性的路径转换。