A concise and mild condition for Pd-catalyzed C(sp²)–H arylation

It is particularly significant to develop mild and efficient methods to construct 2-aryl-substituted benzoic acids framwork due to their wide existence in many important natural organic compounds. Here, we report a concise and mild method to synthesize ortho-arylation of benzoic acids. In this mild catalytic system, decarboxylation byproducts were not observed. Meanwhile, the high yields could be obtained in the absence of ligands.