Abstract
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.
Graphical Abstract
A titania-supported heterogeneous Pd catalyst derived from pincer-type orthopalladated complex is prepared and used as a reusable efficient catalyst in the Sonogashira cross-coupling reactions in green media.
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We gratefully acknowledge the Department of Chemistry, Isfahan University of Technology (IUT).
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Karami, K., Abedanzadeh, S., Afroomand, M. et al. Heterogeneous Copper-Free Sonogashira Cross-Coupling Reactions Catalyzed by a Recyclable Orthopalladated Azo-Complex. Catal Lett 153, 1438–1449 (2023). https://doi.org/10.1007/s10562-022-04059-3
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DOI: https://doi.org/10.1007/s10562-022-04059-3