Organotransition metal complexes capable of forming metalloradicals have been an intriguing subject of study for the past fifty years. Of these, rhodium porphyrin complexes have proven particularly interesting due to their straightforward synthesis and unique reactivity; indeed, these complexes are responsible for some highly influential transformations of organic compounds, including rare C–H and C–C bond activations. The complexity and selectivity of rhodium porphyrins has been attractive for catalytic transformations, with specific interest in their usage for selective carbon monoxide reduction for fuel cell applications. This review will highlight historical and modern syntheses of rhodium porphyrins, as well as their respective reactions with small molecules and applications therein. The discussion will be limited to rhodium porphyrins consisting of four pyrrolic rings bridged with four methine units.

中文翻译：

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铑卟啉配合物的合成与应用

在过去的五十年中，能够形成金属铁的有机过渡金属配合物一直是一个有趣的研究主题。其中，卟啉铑配合物由于其直接合成和独特的反应性而特别令人感兴趣。的确，这些络合物负责有机化合物的某些高度有影响的转化，包括罕见的C–H和C–C键活化。铑卟啉的复杂性和选择性对于催化转化是有吸引力的，特别是将其用于燃料电池应用中的选择性一氧化碳还原。这篇综述将重点介绍铑卟啉的历史和现代合成方法，以及它们与小分子的反应及其在其中的应用。