▎ 摘　　要

A highly active catalyst based on PdCo alloy nanoparticles supported on polypropylenimine dendrimers, grown on graphene nanosheets, was synthesized and used for carbon-carbon cross-coupling Sonogashira reactions. The prepared catalyst facilitated a facile, efficient and environmentally friendly procedure for the Sonogashira reaction under copper and solvent free conditions using ultrasound irradiation at room temperature. The results showed that the catalyst could be easily recovered and reused several times without significant loss of activity.