Sequential twofold meta-C–H/ortho-C–H functionalization was achieved by means of versatile ruthenium(II) biscarboxylate catalysis. The double C–H activation proved viable in a one-pot fashion with the assistance of synthetically useful imidates. The operationally simple twofold C–H functionalization occurred with high levels of positional selectivity control and was conducted in a nonsequential manner by the judicious choice of the reaction temperature. Detailed experimental mechanistic studies, including unprecedented electron paramagnetic resonance (EPR) experiments, provided strong support for homolytic C–X bond cleavage and facile C–H ruthenation, while a computational density functional theory (DFT) analysis was supportive of a novel mechanistic scenario involving synergistic catalysis via cyclometalated ruthenium(III) complexes as key intermediates.

中文翻译：

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一锅钌（II / III）催化的连续间位-/邻位-C-H官能化

顺序双重元-C–H /邻位-C–H官能化是通过多官能钌（II）双羧酸钌催化实现的。在合成有用的酰亚胺的帮助下，一氧化碳的双重活化被证明是一锅法可行的。操作简单的双重C–H官能化在高水平的位置选择性控制下发生，是通过明智地选择反应温度以非顺序方式进行的。详细的实验机理研究，包括空前的电子顺磁共振（EPR）实验，为均相C–X键断裂和便捷的C–H钌化提供了有力的支持，而计算密度泛函理论（DFT）分析则为涉及以下方面的新型机理提供了支持通过环金属化钌（III）配合物作为关键中间体的协同催化。