▎ 摘　　要

Monodisperse CoxPdy alloy nanoparticles supported on reduced graphene oxide (CoxPdy @rGO) were synthesized and served as an efficient and recyclable catalyst for the chelation-assisted ortho C-H bond the alkenylation and cyclization of benzamides. The effect of the metal composition in CoxPdy on the catalytic activity was studied, and it was found that there is a synergistic effect between the Co and Pd. The rGO has been proved to play a crucial role in preventing aggregation of alloy nanoparticles, maintaining good dispersion, high catalytic activity and stability. Controllable synthesis of alkenylation and cyclization products can be achieved by modifying the reaction conditions. In addition, the catalyst was stable and recyclable, and the activity decay in the recovery and scale-up experiments is negligible, providing a mild and highly efficient method for direct C(sp(2))-H functionalization.