The Features of Action of Supported Pd Catalysts in Suzuki–Miyaura Reaction

Abstract

The paper presents the results of comparative analysis of the differential selectivity of Suzuki–Miyaura reaction with aryl bromides using the set of Pd heterogeneous precursors of different natures (\({\text{PdCl}}_{4}^{{2 - }}\) and Pd0) obtained by chemical modification and laser electrodispersion on two types of heterogeneous supports, i.e., SiO2 modified by ionic liquid and γ-Al2O3. Catalytic experiments were carried out under so-called “ligand-free” conditions implying no additives of phosphines, amines, carbenes, or any other organic ligands for Pd stabilization. Changes of the differential selectivity of competing aryl bromides were observed under varying the nature and concentration of Pd precursor thus indicating substantial contribution of true heterogeneous catalysis to the total substrates’ conversion.