LAUSR

A newly heterogeneous palladium catalyst has been synthesized by immobilizing Pd(OAc)2 onto a nitrogen-rich heptazine-based porous framework (Cy-pip). Highly dispersed Pd particles and abundant distributed N atoms in the framework make Pd/Cy-pip very efficient toward the Suzuki–Miyaura reaction in aqueous medium at 40 °C without inert atmosphere and phase transfer agents. Pd/Cy-pip catalytic system is superior to many POPs supported Pd catalysts such as Pd/COF-LZU1, Pd@CNPCs, Pd-CIN-1, and MsMOP-1 that required toxic organic solvents or high temperature. Furthermore, the strong interaction between N donor sites and Pd nanoparticles in the framework extends excellent recyclability without significant deactivation of the catalyst after five cycles.