Pd(5%)-KIT-6, Pd(5%)-SBA-15 and Pd(5%)-SBA-16 catalysts in water extract of pomegranate ash: A case study in heterogenization of Suzuki-Miyaura reaction under external base and ligand free conditions

Lakshmidevi, Jangam; Vakati, Venkateswarlu; Naidu, Bandameeda Ramesh; Raghavender, M.; Rao, K.S.V. Krishna; Venkateswarlu, Katta

doi:10.1016/j.scp.2020.100371

Cited by 27 publications

(14 citation statements)

References 51 publications

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“…The Venkateswarlu group prepared a mesoporous Pd 0 -KIT-6 catalyst via simple wet impregnation by adding an aqueous solution of Pd(NO 3 ) 2 to KIT-6, followed by evaporation on a hot plate and drying at 100 °C for 12 h. Calcination (500 °C, 5 h) gave the final product with a Pd loading of 5 wt%, Pd 0 particles of 9.67 nm, and a dispersion of 12.77 %. [90] Structural characterization included SEM, TEM, H 2 -TPR, and XRD measurements, indicating the presence of amorphous silica. The catalyst was tested in the Suzuki cross-coupling reaction, in the presence of a pomegranate ash water extract (PAextr) containing potassium, chlorine, oxygen, and other organic and inorganic ingredients.…”

Section: Results Obtained By Using Kit Materialsmentioning

confidence: 99%

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

Mastalir

Molnár

2023

ChemCatChem

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Noble metal nanoparticles supported on porous silica materials represent an important class of heterogeneous catalysts. Various synthesis strategies have been developed, including the application of ligand‐assisted metal precursors, multistep synthesis procedures, post‐synthetic modifications, and magnetic mesoporous silica particles. Emphasis has been laid on the introduction of green procedures, based on the utilization of environmentally friendly solvents, efficient stabilizing agents, non‐toxic reagents, and mild reaction conditions. Palladium nanoparticles have long been recognized as the most efficient catalysts in a wide range of organic transformations, including the Heck, Suzuki, Stille, and Sonogashira reactions. Although these transformations have been extensively investigated in homogeneous catalytic systems, the application of heterogeneous catalysts, including silica‐supported Pd0 nanoparticles, has gained in increasing importance. The aim of this review is to provide an outlook on the current research progress achieved on the development of novel synthetic procedures, affording highly dispersed Pd0 nanoparticles immobilized on porous silica materials, which proved to be efficient and recyclable catalysts in C–C coupling and cross‐coupling reactions.

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Section: Results Obtained By Using Kit Materialsmentioning

confidence: 99%

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

Mastalir

Molnár

2023

ChemCatChem

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“…The analysis shows 0.98 ppm of Pd leaching after the first catalytic cycle. It was found that the mechanism of Pd-nanoparticle-catalyzed C–C coupling reactions can be homogeneous, heterogeneous, or a mixture of those two mechanisms (oxidative addition at Pd NP surface, followed by the leaching of the [Pd(Ar)X] species, which goes through the homogeneous catalytic cycle). − The loss of catalytic activity in the recyclability test of the Suzuki–Miyaura cross-coupling reaction could be the result of the homogeneous or mixed (homogeneous–heterogeneous) reaction mechanism. Thus, the result of the recyclability test implies that the redeposition of homogeneous palladium species on the CVS-ZnO support is not efficient enough.…”

Section: Resultsmentioning

confidence: 99%

Pd Nanoparticles Supported on Ultrapure ZnO Nanopowders as Reusable Multipurpose Catalysts

Kokanović,

Ajdačić,

Terzić Jovanović

et al. 2023

ACS Appl. Nano Mater.

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Herein, we report the synthesis and application of a highly active and versatile Pd/chemical vapor synthesis-ZnO (Pd/CVS-ZnO) catalytic system. The two-step preparation of the catalyst includes chemical vapor synthesis (CVS) of ultrapure ZnO nanotetrapods, followed by the liquid-phase in situ reduction of a Pd precursor and deposition of polycrystalline Pd nanoparticles (∼6 nm). The as-synthesized catalyst was characterized using standard instrumental techniques. The catalyst was successfully applied in four chemical reactions: Suzuki–Miyaura cross-coupling, reduction of nitroarenes, decarbonylation, and hydrodebromination of aromatic compounds, of which, the latter two are reported for the first time for the Pd/ZnO catalytic system. The catalyst showed excellent activity within a wide range of substrates, delivering the products in high yields (70–99%). The recyclability of the Pd/CVS-ZnO catalyst was tested through two different approaches. First, the catalyst recyclability was examined in all four reactions, reusing the catalyst up to four times in the Suzuki–Miyaura cross-coupling reaction, as well as the reduction of 4-nitrobenzonitrile, without a significant loss of yield. Furthermore, the catalyst was successively used in three different reactions, showing a high degree of stability and delivering excellent product yields in all cases. In addition to its excellent activity, versatility, and stability, the Pd/CVS-ZnO catalytic system also exhibits excellent recyclability over consecutive runs, which makes it a promising candidate for future application in complex industrial processes.

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“…However, heterogeneous SMC (Suzuki Miyaura cross-coupling) systems have some advantages over homogeneous catalytic systems, including facile separation of catalyst, simplicity of operation, reduced Pd contamination, and a wide range of catalyst recovery and recycling. [73,82,83] Heterogeneous catalysis is a chemical reaction that occurs at solid-gas or solid-liquid interfaces. Many parameters, such as particle size, shape, and metal-support surfaces, can have a considerable impact on metal catalyst catalytic characteristics.…”

Section: Homogeneous Heterogeneous and Heterogenized Catalysismentioning

confidence: 99%

“…[112] The logical option, however, is mesoporous silica because of its enormous surface area, excellent resistivity against heat and chemicals, fine porous distribution, and ease of chemical surface modification, which makes it simple to attach active catalytic species. [82] Magnetic separation has recently drawn considerable interest because magnetic nanocatalysts (because of their insolubility in the reaction system and paramagnetic nature) can be easily isolated from the reaction media by employing an external magnet, omitting the necessity of filtration, centrifugation, or much more time-consuming workups method. [40,87] Additionally, the majority of magnetic nanocatalysts (MNPs used as catalysts or supports) may be recycled several times without compromising their initial activity.…”

Section: Surface Modification Of Npsmentioning

confidence: 99%

A comprehensive review on synthesis of dihydropyrimidione via Biginelli reaction catalyzed by reusable magnetic nanocatalyst (from 2020–till date)

Shakya

Kurmi

Patel

2023

Applied Organom Chemis

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The discovery of a new class of heterocyclic compounds by Pietro Biginelli in 1891 was regarded as a watershed point in the history of chemistry. Biginelli is a well‐known organic chemistry technique for generating dihydropyrimidones/thiones, which are important biological compounds. The chemistry of the Biginelli motifs has been studied in drug development because of the extensive use of multiple Biginelli adducts in various domains. The current review focuses on the magnetic reusable iron nanocatalysts, imparting their catalytic role in the Biginelli reaction, which can be impregnated with ionic liquids, Lewis's acids, metal (monometallic or bimetallic), or hybrid polymers as catalyst support. Our ongoing interest in developing environmentally friendly synthetic methodologies prompted us to investigate the utility of magnetically reusable catalysts where workup provides an eco‐friendly approach in comparison with traditional methods to provide a clear understanding of pathways leading to the formation of Biginelli adducts.

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Pd(5%)-KIT-6, Pd(5%)-SBA-15 and Pd(5%)-SBA-16 catalysts in water extract of pomegranate ash: A case study in heterogenization of Suzuki-Miyaura reaction under external base and ligand free conditions

Cited by 27 publications

References 51 publications

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

Pd Nanoparticles Supported on Ultrapure ZnO Nanopowders as Reusable Multipurpose Catalysts

A comprehensive review on synthesis of dihydropyrimidione via Biginelli reaction catalyzed by reusable magnetic nanocatalyst (from 2020–till date)

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