Ashes from organic waste as reagents in synthetic chemistry: a review

Environmental Chemistry Letters, Journal Year: 2021, Volume and Issue: 19(5), P. 3887 - 3950

Published: May 22, 2021

Language: Английский

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An Efficient and Facile Synthesis of 2‐Amino‐4H‐pyrans &Tetrahydrobenzo[b]pyrans Catalysed by WEMFSA at Room Temperature

ChemistrySelect, Journal Year: 2020, Volume and Issue: 5(6), P. 1896 - 1906

Published: Feb. 12, 2020

Abstract An eco‐friendly and facile three‐component reaction for the synthesis of 2‐amino‐4 H ‐pyran tetrahydrobenzo[ b ]pyran derivatives is established using agro‐waste based Water Extract Muskmelon Fruit Shell Ash (WEMFSA) as a catalyst. The present method offers several advantages such efficient, mild condition, simple product isolation economic approach at room temperature in absence an external base or ligand/catalyst/additives. Thus, this very good alternative to existing protocols, because non‐hazardous catalyst condition use. fruit dried shells underwent thermal treatment followed by deionised water soak gave WEMFSA catalytic media. It notable that, found be clean high yielding target filtration after mixture dilution with analytical pure form was obtained recrystallization absolute ethanol. synthesized products are characterized various spectroscopic methods FT‐IR, 1 H‐, 13 C‐NMR mass spectrometry techniques.

Language: Английский

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Agricultural waste valorization towards (nano)catalysts for the production of chemicals and materials

Fuel, Journal Year: 2023, Volume and Issue: 351, P. 128935 - 128935

Published: June 20, 2023

Language: Английский

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Effect of physicochemical properties of carbons on the performance of bead-type Pd/C catalysts for furfural hydrogenation

Molecular Catalysis, Journal Year: 2024, Volume and Issue: 558, P. 114025 - 114025

Published: March 11, 2024

Language: Английский

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Knoevenagel condensation reaction catalysed by agro-waste extract as a greener solvent catalyst

Organic Communications, Journal Year: 2021, Volume and Issue: 14(1), P. 81 - 91

Published: March 26, 2021

This paper present a novel Knoevenagel reaction protocol for the condensation of aromatic/heteroaromatic aldehydes with malononitrile to give α, β–unsaturated benzylidene derivatives. The main focus this work is reveal usability agro-waste extracts as catalyst in condensation. proceeds efficiently various substituted aromatic and heterocyclic reactions. In addition, method describes direct isolation formed products without using organic solvent extraction gave good yields product.

Language: Английский

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Microwave synthesis, X-ray analysis, in vitro and in silico evaluation of the antioxidant and anti-urease activities of novel acridine derived from β-enaminones

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 141609 - 141609

Published: Jan. 1, 2025

Language: Английский

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Chemical Recycling of Catalytic Glycolysis of Polyethylene Terephthalate with Potassium-Rich Biomass

Recycling, Journal Year: 2025, Volume and Issue: 10(3), P. 85 - 85

Published: May 2, 2025

Polyethylene terephthalate (PET) products are ubiquitous in daily life, offering convenience but posing significant environmental challenges due to their persistence and the difficulty of recycling them. Improper disposal waste PET contributes severe pollution resource loss. Chemical degradation has emerged as one most effective methods for recovering reusing PET. This article introduces a catalytic glycolysis strategy efficient environmentally sustainable using potassium-rich biomass, specifically banana peels. The study demonstrated that K2O K2CO3, derived from calcined peels, significantly catalyze Under optimal conditions, complete was achieved within 1.5 h at 180 °C, without additional chemical reagents. Product distribution confirmed high-purity bis(2-hydroxyethyl) could be obtained. interaction between K2CO3 ethylene glycol plays critical role determining competition alkaline hydrolysis. Furthermore, Density Functional Theory calculations provided valuable insights into transesterification process during glycolysis. reaction system also excellent compatibility with colored products. successfully realized simultaneous post-consumer novel approach valorization.

Language: Английский

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Microwave-Accelerated Facile Synthesis of 1H-Pyrazolo[1,2-b]Phthalazine-5,10-Dione Derivatives Catalyzed by WEMPA

Polycyclic aromatic compounds, Journal Year: 2020, Volume and Issue: 42(5), P. 2162 - 2178

Published: Oct. 13, 2020

An efficient and rapid one-pot multicomponent synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones through condensation aldehyde, malononitrile phthalhydrazide catalyzed by agro-waste solvent catalyst-derived water extract mango peel ash (WEMPA) under microwave irradiation is described. Further, the catalyst prepared from agricultural waste characterized for elemental composition different techniques such as SEM-EDX, XRD flame photometry. This green synthetic approach offers various advantages inexpensive, abundantly available source, shorter reaction time (6–8 min), good-to-excellent yield (83%–89%), simple workup a sustainable alternative method to existing protocols. All synthesized compounds (4a–l) was confirmed FT-IR, 1H-NMR, 13C-NMR LC-MS.

Language: Английский

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BiCl₃-catalyzed green synthesis of 4-hydroxy-2-quinolone analogues under microwave irradiation

RSC Advances, Journal Year: 2023, Volume and Issue: 13(40), P. 28030 - 28041

Published: Jan. 1, 2023

Traditional chemical synthesis, which involves the use of dangerous protocols, hazardous solvents, and toxic products catalysts, is considered environmentally inappropriate harmful to human health. Bearing in mind its numerous drawbacks, it has become crucial substitute conventional chemistry with green safer, more ecofriendly effective terms time selectivity. Elaborating synthetic protocols producing interesting new compounds using both microwave heating heterogeneous non-toxic catalysts acknowledged as a approach that avoids many classical chemistry-related problems. In current study, β-enaminones were used precursors synthesis modified 4-hydroxy-2-quinolone analogues. The was monitored benign way under irradiation catalyzed by bismuth chloride III an amount 20 mol%. This method privileged non-corrosive, non-toxic, low-cost available Lewis acid catalyst made respectful demands chemistry. synthesized obtained moderate good yields (51-71%) characterized 1H, 13C NMR, IR spectroscopy well elemental analysis. Compound 5i subjected complete structural elucidation X-ray diffraction method, results show obtention enolic tautomeric form.

Language: Английский

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Repurposing fallen leaves to bio-based reaction medium for hydration, hydroxylation, carbon-carbon and carbon-nitrogen bond formation reactions

Sustainable Chemistry and Pharmacy, Journal Year: 2020, Volume and Issue: 15, P. 100225 - 100225

Published: Feb. 14, 2020

Language: Английский

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