Polyetheretherketone fiber-supported polyethylene glycols for phase-transfer catalysis in its surface layer

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: 694, P. 134160 - 134160

Published: May 3, 2024

Language: Английский

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Asymmetric phase-transfer catalysis

Nature Reviews Chemistry, Journal Year: 2024, Volume and Issue: 8(11), P. 851 - 869

Published: Oct. 9, 2024

Language: Английский

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Chiral Amplification and Regulation: Design and Applications of Circularly Polarized Luminescence‐Active Materials Derived From Macrocyclic Compounds

Aggregate, Journal Year: 2025, Volume and Issue: unknown

Published: May 9, 2025

ABSTRACT Chirality is a fundamental property in molecules and biological systems, characterized by asymmetric configurational features. Circularly polarized luminescence (CPL) materials have gained significant attention due to their unique optical activities, with applications 3D displays, chiral sensors, catalysis, more. Chiral transfer amplification typically involve the generation of chirality excited state, facilitated interactions like energy transfer, electron or induction. Supramolecular self‐assembly strategies, particularly macrocyclic compounds, enable linking achiral luminescent units through intermolecular interactions. Macrocyclic hosts—cyclodextrins, calix[ n ]arenes, pillar[ cyclophanes, cucurbit[ ]urils—are especially promising stable structures adjustable cavities for guest encapsulation. These compounds induce photophysical properties host–guest complexation, making them ideal constructing amplification, CPL‐active materials. This review summarizes advancements multicolor CPL materials, sensing, induction, separation, highlighting potential supramolecular material design. The challenges future directions this field are also discussed, aiming guide further research application systems.

Language: Английский

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State Of The Art Of Supported Phase Transfer‐Catalysts Onium Salt‐Based

ChemCatChem, Journal Year: 2024, Volume and Issue: 16(11)

Published: Jan. 11, 2024

Abstract This review describes the advances of heterogenous phase‐transfer catalysts onium‐based and their importance from a sustainable point view. Although heterogeneous have shown incredible advantages in many organic reactions, examples supported are still limited. In this review, we will examine most common supports, including polymers, clays, inorganic materials. Additionally, new recent developments carbon materials application as efficient water be reported, opening route toward green procedures. Furthermore, considering ever‐growing interest asymmetric synthesis wish to discuss important achievements field chiral catalysts.

Language: Английский

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Selective synthesis of thiadiazolo-2H-chromen-2-ones and chromeno-thiadiazolo-pyrimidines under thermal conditions and microwave irradiation catalyzed by calixarene-based ionic liquid immobilized on magnetic nanoparticles

Journal of Molecular Liquids, Journal Year: 2024, Volume and Issue: 397, P. 124118 - 124118

Published: Jan. 25, 2024

Language: Английский

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Heterogeneous phosphonium–carbon based PTC catalyst: From mechanochemical synthesis to SN2 type reaction in water

Molecular Catalysis, Journal Year: 2023, Volume and Issue: 550, P. 113558 - 113558

Published: Sept. 22, 2023

Language: Английский

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Heterogeneous Phosphonium–Carbon Based Ptc Catalyst: From Mechanochemical Synthesis to Sn2 Type Reaction in Water

Published: Jan. 1, 2023

The use of phosphonium-carbon-based PTC as a catalyst in water solution is here described and its performances are discussed. synthesis realized via mechanochemical process solvent-free conditions respecting most the green metrics for sustainable procedure. heterogeneous phase-transfer fully characterized used SN2 type reaction NaSCN with variously substituted benzyl bromides. proceeds high efficiency presence 5mol% up to >99% conversion. can be easily recycled without losing productivity providing

Language: Английский

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d-Idose-Based Monoaza-15-Crown-5 Lariat Ethers: Synthesis of an Elusive d-Hexose and Application of Derived Macrocycles in Enantioselective Syntheses

Symmetry, Journal Year: 2023, Volume and Issue: 15(9), P. 1714 - 1714

Published: Sept. 7, 2023

Carbohydrate-based macrocycles can be enantioselective catalysts in certain reactions. Previously, it was proven that the carbohydrate moiety could affect catalytic activity of monoaza-15-crown-5 type derived from sugars. According to our experiments so far, most effective were d-glucose- and d-galactose-based crown ethers. To obtain more information about effect unit, a rare monosaccharide, d-idose incorporated into structure. The key intermediates methyl 4,6-O-benzylidene-α-d-idopyranoside 4,6-O-benzylidene-β-d-idopyranoside, which synthesized d-galactose. efficiency idopyranoside-based compounds investigated asymmetric phase transfer In liquid-liquid biphasic reactions highest enantioselectivity 81% ee, while solid-liquid systems induction 67% ee. It observed enantiodiscrimination strongly dependent on configuration anomeric center, side arm nitrogen, structure substrate.

Language: Английский

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α‐Methylbenzylamine Functionalized Crown‐Ether‐Appended Calix[4]arene Phase Transfer Catalyst for Enantioselective Henry Reaction

Chemistry - A European Journal, Journal Year: 2023, Volume and Issue: 29(72)

Published: Oct. 18, 2023

In this letter, we designed a highly selective α-methylbenzylamine functionalized crown-ether-appended calix[4]arene derived phase transfer catalyst for asymmetric nitroaldol reaction to provide the desired adducts in high yields (up 99 % yield) with good excellent enantioselectivities 99.8 ee).

Language: Английский

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