Abstract
We reveal the Suzuki–Miyaura reaction catalyzed by a Pd–Co nanocatalyst supported by Mg–Fe–CHT (calcined hydrotalcites). A variety of boronic acids and aryl halides were transformed into functionalized biphenyls in excellent yields using water as a solvent. The reaction could proceed under mild conditions with a simple operation and high turnover numbers. The excellent catalytic activities are reasonably attributed to the Co-doping, which forms a Pd–Co alloy on the surface of CHT.
Highlights
In the past decades, carbon–carbon cross couplings have been widely applied for the synthesis of natural products and biologically active molecules [1,2,3,4]
The preparation of the Pd/Co–Mg–Fe–CHT catalyst is shown in Scheme 1 via a co-precipitation
Inacid our were used as model substrates with two equivalents of base and mg
Summary
Carbon–carbon cross couplings have been widely applied for the synthesis of natural products and biologically active molecules [1,2,3,4]. Numerous highly active homogeneous Pd catalytic systems have been investigated for the reaction [8,9,10,11,12]. Pd catalysts incurs a high cost due to the utilization of unrecoverable noble metals and ligands. Practical limitations, such as catalyst operation, reusability, and isolation of the catalyst from products, hinder the advantages of homogeneous Pd catalysts in large-scale industrial processes. A heterogeneous Pd catalyst could obviate these limitations and open up a valuable alternative technology in such processes [13,14,15,16,17]. Palladium nanoparticles (NPs) supported by various substrates, such as active carbon materials [18,19], silica [20,21,22], polymers [23,24], inorganic mineral [25,26], metal oxides [27,28,29], and covalent organic frameworks (COFs) [30,31]
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