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Heterogeneous Copper-Free Sonogashira Cross-Coupling Reactions Catalyzed by a Recyclable Orthopalladated Azo-Complex

In this work, the preparation of titania-supported Pd catalyst deriving from pincer-type orthopalladated azo-complex is presented. The new highly dispersed Pd catalyst was prepared through a pH-controlled adsorption method and fully characterized by FT-IR, XRD, TGA, FE-SEM, TEM and N2 adsorption/desorption techniques. The Pd/TiO2 nano-catalyst was then applied as an efficient heterogeneous catalyst for copper-free Sonogashira cross-coupling reactions of a representative range of aryl iodides, bromides, and chlorides with phenylacetylene with the very low catalyst Pd-loading. The coupling products were obtained in high yields in environmentally friendly reaction media. The catalyst was successfully recycled over six runs, with no significant loss of catalytic activity.

Journal Papers
Month/Season: 
Summer
Year: 
2023

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