The use of p-sulfonic acid calix[4]arene as organocatalyst for pretreatment of sugarcane bagasse increased the production of levoglucosan

Industrial Crops and Products, Год журнала: 2019, Номер 134, С. 382 - 387

Опубликована: Апрель 28, 2019

Язык: Английский

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Microwave-assisted green synthesis of levulinate esters as biofuel precursors using calix[4]arene as an organocatalyst under solvent-free conditions

Sustainable Energy & Fuels, Год журнала: 2020, Номер 5(1), С. 108 - 111

Опубликована: Окт. 28, 2020

Levulinic acid, one of the top 12 value-added chemicals, can be obtained by transformation biomass acid catalysis.

Язык: Английский

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Highly Enantioselective Ruthenium-Catalyzed Cascade Double Reduction Strategy: Construction of Structurally Diverse Julolidines and Their Analogues

Organic Letters, Год журнала: 2020, Номер 22(6), С. 2251 - 2255

Опубликована: Фев. 28, 2020

A direct and facile construction of optically pure julolidine derivatives through ruthenium-catalyzed enantioselective cascade hydrogenation reductive amination 2-(quinolin-8-yl)ethyl ketones has been developed. By means this protocol, various chiral compounds were obtained in high isolated yields (up to 94%) with excellent diastereoselectivities >20:1 dr) enantioselectivities 99% ee) under mild conditions. Furthermore, the synthetic practicality protocol was illustrated by preparation hexahydrojulolidines a fluorescent molecular rotor.

Язык: Английский

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Microwave-assisted multicomponent synthesis of julolidines using silica-supported calix[4]arene as heterogeneous catalyst

Tetrahedron, Год журнала: 2019, Номер 75(27), С. 3740 - 3750

Опубликована: Май 29, 2019

Язык: Английский

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One-pot tandem synthesis of 5-ethoxymethylfurfural as a potential biofuel

Reaction Chemistry & Engineering, Год журнала: 2022, Номер 8(1), С. 220 - 228

Опубликована: Окт. 11, 2022

5-Ethoxymethylfurfural (EMF) is a potential biofuel, fuel additive and raw material in the chemical beverage industry.

Язык: Английский

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Green synthesis of 5-hydroxymethylfurfural and 5-acetoxymethylfurfural using a deep eutectic solvent in a biphasic system assisted by microwaves

Reaction Chemistry & Engineering, Год журнала: 2023, Номер 8(6), С. 1324 - 1333

Опубликована: Янв. 1, 2023

The fructose was subjected to a dehydration reaction produce 5-hydroxymethylfurfural using deep eutectic solvent composed of choline chloride, fructose, water as the third component mixture and p -sulfonic acid calix[4]arene an organocatalyst.

Язык: Английский

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Optical and Vapor Sensing Properties of Calix[4]arene Langmuir-Blodgett Thin Films with Host–Guest Principles

Journal of Macromolecular Science Part A, Год журнала: 2018, Номер 55(7), С. 526 - 532

Опубликована: Июнь 1, 2018

25,27-(Dipropylmorpholinoacetamido)-26,28-dihydroxycalix[4]arene was used as a chemical sensor material in this work. The calix[4]arene LB thin films were prepared onto gold-coated glass and quartz substrates to fabricate film element. Atomic Force Microscopy (AFM) Surface Plasmon Resonance (SPR) techniques characterize all the films. thickness refractive index of can be evaluated with fitted experimental SPR datas. per monolayer determined 1.58 ± 0.04 1.27 0.09 nm, respectively. element exposed dichloromethane, chloroform, benzene toluene vapors. kinetic measurements displayed that, photodetector response change, ΔIrf for saturated dichloromethane vapor is much larger than other vapors value 48 au diffusion coefficient 5.1 × 10−16 cm2s−1. Swelling process analyzed by well known Fick's Equations. In approach coefficients () swelling conformed square root time correlated volatile organic compounds. Our results showed that has highly selective large vapor.

Язык: Английский

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Application of the Povarov Reaction in Biaryls under Iron Catalysis for the General Synthesis of Dibenzo[a,c]Acridines

The Journal of Organic Chemistry, Год журнала: 2020, Номер 85(14), С. 9281 - 9289

Опубликована: Июнь 26, 2020

A modified Povarov reaction involving 2′-alkynylbiaryl-2-carbaldehydes and aryl amines with tandem oxidation was performed using catalytic FeCl3. The outcome an efficient general synthesis of dibenzo[a,c]acridines moderate to high yields. This method offers simplicity in the preparation substrates, diverse substrate scope, atom economy. generality protocol verified by synthesizing a tribenzo[a,c,h]acridine derivative. Photophysical properties synthesized compounds were also studied. absorb UV light typically range 230–330 nm emit visible 400–420 nm.

Язык: Английский

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Anise Essential Oil as a Sustainable Substrate in the Multicomponent Double Povarov Reaction for Julolidine Synthesis

The Journal of Organic Chemistry, Год журнала: 2020, Номер 85(23), С. 15622 - 15630

Опубликована: Ноя. 11, 2020

The use of star anise oil from a natural source as dienophile in the multicomponent double Povarov reaction (MCPRs) to produce highly substituted julolidines with diverse technological applications is described. Within framework green chemistry, these MCPRs have many advantages such (i) water reaction, (ii) creation up six bonds one sequence, (iii) sole waste, (iv) 100% carbon economy, (v) metal-free process, and (vi) nontoxic reusable organocatalysts. These advantages, along simple workup procedure, make this protocol greener for synthesis julolidines.

Язык: Английский

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p-Sulfonic Acid Calix[n]arene Catalyzed Synthesis of Bioactive Heterocycles: A Review

Current Organic Chemistry, Год журнала: 2020, Номер 25(1), С. 209 - 222

Опубликована: Окт. 20, 2020

Metal-free organocatalysts are becoming an important tool for the sustainable development of various bioactive heterocycles. On other hand, during last two decades, calix[n]arenes have been gaining considerable attention due to their wide range applicability in field supramolecular chemistry. Recently, sulfonic acid functionalized calix[n] arenes being employed as efficient alternative catalyst synthesis scaffolds. In this review, we summarized catalytic efficiency p-sulfonic diverse, biologically promising scaffolds under reaction conditions. There is no such review available literature showing calix[n]arenes. Therefore, it strongly believed that will surely attract those researchers who interested fascinating organocatalyst.

Язык: Английский

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