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Acid Catalysis - Europe PMC

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Last Updated: 10 November 2022

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Hydrophobic species-enabled acid-base multi-catalysis for stereoselective access to renewable trans -anethole.

The porous structure and the enhanced hydrophobicity of the spherical catalyst PAS-Hf ensured the establishment of more accessible and reliable Lewis and Bru00f8nsted acid active sites, which could be used for rapid conversion of biomass-based 4-MOPP to AN in 0. 2 h. According to density's compatibility functional theory analyses, the addition of PAS-Hf could greatly ease the conversion process by lowering the reaction energy barrier of the rate-determining step. More than ten species of aldehydes and ketones could be expanded to more than ten varieties of aldehydes and ketones by Lewis acid-base and Bru00f8nsted acid species.

Source link: https://europepmc.org/article/MED/36278834


Metal-Micelle Interaction Leading to Spontaneous Formation of Ligand-Free Palladium(0) Nanoparticles: Highly Efficient Catalysis Enabling Biaryl Ketone Formation from Carboxylic Acid Derivatives.

A new method has been devised to naturally produce ligand-free Pd nanoparticles from water- and air-sensitive Pd 2 dba 3 in water. These naturally formed NPs are more effective than new synthetic NPs created under a hydrogen atmosphere and traditional NPs produced using the air-sensitive Grignard reagent as a reductant. Naturally formed NPs are more cost-effective than synthetic NPs on 34 substrates, indicating that naturally formed NPs are more effective than synthetic NPs.

Source link: https://europepmc.org/article/MED/36341774


Coordination Polymers Constructed from an Adaptable Pyridine-Dicarboxylic Acid Linker: Assembly, Diversity of Structures, and Catalysis.

The obtained CPs were also tested in the Knoevenagel condensation of benzaldehyde with propanedinitrile to give 2-benzylidenemalonitrile, apart from standard methods' analysis. This catalyst is recyclable and may lead to substituted dinitrile products in up to 99% product yields. The present study expands the use of H2 pdba as a yet poorly understood linker toward the development of novel functional coordination polymers.

Source link: https://europepmc.org/article/MED/36318516


Synergistic Lewis-Brønsted Acid Catalysis in Cascade Cyclization of ortho -Alkynylaryl Cyclopropylketones for the Synthesis of 2,3-Dihydronaphtho[1,2- b ]furans.

A synthetic method for the synthesis of 2,3-dihydronaphtho[1,2-b]furans using synergistic Lewis-Bru00f8nsted Acid catalyzed cyclization of ortho -alkylketones has been devised in this article. In addition, we discovered that 2,3-dihydrotetraphen-7-ol anaologs could be processed to produce 5,6-dihydrotetraphen-7-ol anaologs under acidic conditions via Friedel-Crafts-type alkylation in good to excellent yields. The intended transformation was achieved by treating with m -CPBA in the absence of NaHCO 3 to produce the desired quinone products with high to excellent yields.

Source link: https://europepmc.org/article/MED/36282245


Stable catalysis of neutral silica-supported potassium lactate for vapour-phase dehydration of lactic acid to acrylic acid - critical role of the support.

The acidic KNO 3 /silica methods are not suitable for catalytic selectivity and stability for the production of AA, according to a series of catalytic and acid property studies, whereas the neutral KNO 3 /silica systems favour catalytic selectivity and stability for the production of AA, whereas the non-inhibited KNO 3 /silica systems favour catalytic selectivity and stability for the production of AA, whereas the solid KNO 3 /silica systems are not /silica systems are not /silica KNO 3 /silica /silica/silica systems favour /silica models favour catalytic selectivity and stability for AA. According to a combination of catalytic and TGA studies, KNO 3 and silica's interaction with silica has a major promotional effect on AA's catalytic stability, which has a significant promotional influence on TGA's production's catalytic stability. The effects of the surface acidity and silica interactions on the catalytic results, according to a combination of IR analysis and catalytic activity, are related to the content and stability of potassium lactate as the catalytic active species.

Source link: https://europepmc.org/article/MED/36193811


Deracemization through Sequential Photoredox-Neutral and Chiral Brønsted Acid Catalysis.

Catalytic deracemization is a popular synthetic tactic due to its formally superb atom utilization. The photocatalyst and the substrates provide the primary prochiral intermediates, and the chiral Bru00f8nsted acid catalyst mediates enantioselective protonation to reconstitute a stereogenic C-H bond.

Source link: https://europepmc.org/article/MED/36250910

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions