APTPOSS and Cyclodextrin Nanosponge Hybrid as an Efficient Pd-immobilized Nanomagnetic Catalyst for Ligand and Copper Free C-C Coupling Reactions

To promote our previously reported effort on developing new heterogeneous Pd immobilized catalyst using cyclodextrin nanonosponge (CDNS) [1], a hybrid of octakis [3-(3-aminopropyltriethoxysilane) propyl]octasilsesquioxane (APTPOSS) and CDNS was used as a support to embed Fe3O4/Pd nanoparticles. The obtained catalyst, Fe3O4/Pd@CDNS-APTPOSS could promote ligand and copper free Sonogashira and Heck coupling reactions and different characteristic methods, including FTIR, TGA, XRD, SEM/EDS, TEM, ICP/AES and BET were applied to characterize the obtained catalyst. Although APTPOSS potential for catalytic activity has been proved [2,3], the catalytic activity of Pd@CDNS-APTPOSS was superior compared to that of Pd@APTPOSS and Pd@CDNS, indicating the synergism between CDNS and APTPOSS and the catalyst was recyclable with slight Pd leaching and loss of the catalytic activity after several reaction runs.