Pyrazolyl-pyrimidine porous-organic-polymer supported single-site nickel composites as efficient catalysts for the synthesis of substituted pyrimidines

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 474, P. 145642 - 145642

Published: Aug. 25, 2023

Language: Английский

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Metal‐Ion/Metal Nanoparticle‐Anchored Porous Organic Polymers as Efficient Catalysts for Organic Transformations – A Recent Overview

Chemistry - An Asian Journal, Journal Year: 2023, Volume and Issue: 18(8)

Published: Feb. 23, 2023

Porous organic polymers are porous materials that interlinked with building blocks by strong covalent bonds. The functional groups on the can be carefully chosen to obtain a POP desired functionalities. In certain cases, pores or voids interact molecules via non-covalent interactions and hence they serve as catalytic centers. many pristine POPs themselves were evaluated heterogeneous catalysts for their activity. inner of act ligand metal ions/metal nanoparticles wide range metal-ion-anchored nanoparticle-loaded reported. These catalyze different reactions metal-based catalysis following pathway. this type catalysis, plays an important role, i. e., it serves carbon matrix, interacts interactions, further in metal/metal-ion-anchored POPs, concentration is highly reduced transformation effectively takes place at interface metal/carbon matrix. Herein, we discuss recent developments metal-ion/metal nanoparticle loaded role various transformations such C-C coupling reactions, borrowing hydrogen CO2 transformations, hydroformylations oxidation alkynes 1,2-diketones C-H arylation reactions.

Language: Английский

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Fe3O4 NPs: A heterogeneous and reusable magnetic nanocatalyst for base and solvent free one-pot multicomponent synthesis of pyridine derivatives and their photo-physical study

Molecular Catalysis, Journal Year: 2024, Volume and Issue: 557, P. 113978 - 113978

Published: Feb. 28, 2024

Language: Английский

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5,12-Dihydroquinoxalino[2,3-b] quinoxaline-based porous organic polymer as photocatalyst for visible-light-driven cross-coupling reactions

Journal of Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 115972 - 115972

Published: Jan. 1, 2025

Language: Английский

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Synthesis of 1‐Aryl‐β‐Carbolines via a Pd‐Catalyzed Oxidative Pictet‐Spengler Reaction/Aromatization Cascade Using Benzylic Alcohols in Water

European Journal of Organic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract We report a Pd‐catalyzed oxidative Pictet‐Spengler reaction/aromatization cascade utilizing readily available benzylic alcohols for the construction of 1‐aryl‐ β ‐carbolines in water. Conceptually, this novel one‐pot, three‐step approach involves an initial Pd(0)/sodium diphenylphosphinobenzene‐3‐sulfonate (TPPMS)‐catalyzed dehydrogenation alcohols, followed by cyclization situ generated aldehydes with tryptamines, and concludes DBU/air‐promoted aromatization, allowing rapid access to desired ‐carbolines. The π ‐benzylPd (II) catalytic system from Pd(0)/TPPMS was found be highly effective alcohol

Language: Английский

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Biogenic synthesis of δ‐MnO₂ nanoparticles: A sustainable approach for C‐alkylation and quinoline synthesis via acceptorless dehydrogenation and borrowing hydrogen reactions

Applied Organometallic Chemistry, Journal Year: 2023, Volume and Issue: 37(7)

Published: April 26, 2023

The sustainable and environmentally benign biogenic synthesis of manganese‐oxide nanoparticles (MnO 2 NPs) in a single crystalline δ ‐phase its subsequent synthetic utility have been described. synthesized ‐MnO NPs were characterized using scanning electron microscopy (SEM), energy dispersive X‐ray (EDX), diffraction (XRD) analysis techniques. detailed envisages the reduction Mn(VII) to Mn(IV) was facilitated by various phytochemicals present aq. mango leaves extract, avoiding use external ligand source. perceived delta ( ) monoclinic phase, wherein spherical agglomerated morphology displayed with particle size <5 nm. Further, newly developed showcased for alpha‐keto‐alkylation quinoline via hydrogen autotransfer acceptorless dehydrogenative coupling strategy. Moreover, series control experiments, mechanistic elucidation, catalyst recyclability, dye removal study demonstrated.

Language: Английский

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Recyclable Iridium Catalyst Supported on Porous Organic Polymer for Acceptorless Dehydrogenative Silylation: Synthesis of Ring‐Fused Oxasilacycles

Advanced Synthesis & Catalysis, Journal Year: 2024, Volume and Issue: 366(8), P. 1763 - 1769

Published: March 1, 2024

Abstract The direct conversion of specific C−H bonds to C−Si in alkanes or aromatics via catalytic methods has attracted growing research interest. Herein, we report the preparation a new iridium catalyst supported on naphthyridine‐based porous organic polymer and its successful application dehydrogenative silylation 2‐arylphenols alcohol hydrosilanes access ring‐fused oxasilacycles. synthetic method exhibits broad substrate scope good functional group compatibility while avoiding use hydrogen acceptors. In addition, this could be easily recovered from reaction system reused for at least seven times without apparent deactivation. This provides insights further design heterogeneous nanocatalysts contributes synthesis silicon‐substituted molecules.

Language: Английский

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Greener Approach for Synthesis of δ-MnO₂ Nanoparticles: Access to Pharmaceutically Important Pyrimidines and their Antimicrobial Activity Studies

ACS Applied Bio Materials, Journal Year: 2024, Volume and Issue: 7(3), P. 1790 - 1800

Published: Feb. 29, 2024

A sustainable approach for pharmaceutically important pyrimidine derivatives is achieved by using biogenically produced single-phase δ-MnO2 NPs under external ligand-free conditions. The phytochemicals that comprise the extract of Areca Nut Husk (ANH) have been discovered to serve as reducing agents. role not only aid in reduction Mn(VII) into Mn(IV), but they also an stabilizing catalyst. establishment was confirmed inveterate FE-SEM, p-XRD, ICP-OES (Mn content = 43.17% w/w), EDX, and with active Mn w/w. series were prepared good yields a one-pot multicomponent synthesis atmospheric In addition, hot filtration tests, control experiments, gram-scale synthesis, mechanistic investigations demonstrated. Additionally, antimicrobial activity studies against Gram-negative bacteria E. coli, growth curve minimum inhibitory concentration studied.

Language: Английский

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Robust and Elastic Thermoresponsive Hydrogels with High Swelling Properties for Efficient Solar Water Purification

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(6), P. 3253 - 3262

Published: March 12, 2024

A viable and long-term method for producing clean water at hydrogel interfaces is solar-driven evaporation. This research utilizes the microgel polymerization technique to fabricate DCS-PNIPAm gels that exhibit exceptional swelling capacity mechanical qualities. Electrostatic forces hydrogen bonds between molecules occur sulfonic acid anions ammonium cations inside P(NIPAm-co-DMAPS) chains. Alginate characterized by a high content of carboxyl hydroxyl groups, which facilitate establishment bonding electrostatic interactions within system. Semi-interpenetrating networks are formed in as result physical chemical cross-linking brought on these interactions. Consequently, hydrogel's characteristics were significantly enhanced, water-collecting rate reached up 9.32 kg m–2 h–1 under one sun irradiation. Notably, sodium alginate (SA) carbon nanotubes (CNTs) layer gel has excellent filtration properties, can make it possible use sunlight purify from various contaminated sources containing dyes, oils, metals.

Language: Английский

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Half-Sandwich Iridium Complexes with Hydrazone Ligands: Synthesis and Catalytic Activity in N-Alkylation of Anilines or Nitroarenes with Alcohols via Hydrogen Autotransfer

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(27), P. 10310 - 10320

Published: June 29, 2022

Here, we synthesize a series of hydrazone-based N,O-chelate half-sandwich iridium complexes through facile route. All air-stable show high catalytic activity in N-alkylation broad scope aniline derivatives and alcohols with liberating water as the sole byproduct. This reaction provides smooth route to diverse monoalkylated amines good excellent yields at moderate temperature low catalyst loading. Moreover, challenging process using nitroarene substrates coupling partners is also carried out this system. The mechanistic study shows that present catalysis proceeds hydrogen borrowing mechanism. iridium(III) 1-4 are characterized by infrared (IR) spectroscopy, nuclear magnetic resonance (NMR) elemental analysis.

Language: Английский

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