▎ 摘　　要

The use of heterogeneous bimetallic Pd-based nanocatalyst for directing the inactivated sp(3) C-H coupling has been scarcely explored. This work reported the formation of symmetrical C-C bonds from the inactivated sp(3) C-H bonds catalyzed by employing reduced graphene oxide supported PtPd@Pt porous nanospheres. The reaction of sp(3) C-H activation proceeded under mild conditions without any solvent, ligand or directing group. It is a higher atom-, step- and cost-effectiveness strategy for developing heterogeneous catalysts in the synthesis of bibenzyls with various functional groups (e.g. aryl, alkyl, methoxyl, halogen, ester, and pyridyl).