Brönsted acidic ionic liquid-catalyzed conversion of hemicellulose into sugars

2015 ◽  
Vol 5 (1) ◽  
pp. 531-539 ◽  
Author(s):  
Babasaheb M. Matsagar ◽  
Paresh L. Dhepe
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids

Brönsted acidic ionic liquids were synthesized, characterized and used in the conversion of assorted hemicelluloses to yield C5 sugars in 87% yield.

Brønsted acidic ionic liquid-catalyzed dehydrative formation of isosorbide from sorbitol: introduction of a continuous process

2017 ◽  
Vol 7 (10) ◽  
pp. 2065-2073 ◽  
Author(s):  
Jie Deng ◽  
Bao-Hua Xu ◽  
Yao-Feng Wang ◽  
Xian-En Mo ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Continuous Process ◽  
Efficient Synthesis ◽  
Acidic Ionic Liquid ◽  
Highly Efficient ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
First Time

A highly efficient synthesis of isosorbide from sorbitol was developed using Brønsted acidic ionic liquids (BILs) as the catalyst for the first time.

scholarly journals Mild and Efficient Tunable Brønsted Acidic Ionic Liquid Catalyzed O-Acetylation and O-Trimethylsilylation with Trimethylsilyl Acetate (TMSOAc) and Hexamethyldisilazane (HMDS)

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 825
Author(s):  
Amit Ravindra Pantawane ◽  
Mayur Thul ◽  
Yi-Jyun Lin ◽  
Michelle Lin ◽  
Wesley Lin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Visible Spectroscopy ◽  
Acidic Ionic Liquid ◽  
Post Process ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Uv Visible ◽  
Work Up

This report discloses a mild and efficient O-acetylation using easily accessible TMSOAc as a novel acetyl reagent and O-trimethylsilylation using HMDS for various alcohols catalyzed by tunable Brønsted acidic ionic liquids (TBAILs). Imidazolium-based TBAILs were prepared by a two-step atom-economic reaction and acidities measured by using UV-visible spectroscopy. Both protections for alcohols were accomplished at room temperature with good to excellent yields, while the products and TBAILs were separated by simple work-up for O-silylation and column chromatography for O-acetylation. Notably, with the simple post-process, TBAILs catalyst in this solvent free method easily recovered and recycled several times without significant degradation.

Understanding the role of hydrogen bonding in Brønsted acidic ionic liquid-catalyzed transesterification: a combined theoretical and experimental investigation

2016 ◽  
Vol 18 (48) ◽  
pp. 32723-32734 ◽  
Author(s):  
Kaixin Li ◽  
Yibo Yan ◽  
Jun Zhao ◽  
Junxi Lei ◽  
Xinli Jia ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Ionic Liquid ◽  
Hydrogen Bonding ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Hydrogen Bonding Networks

The intra- and inter-hydrogen bonding networks that govern the catalytic activity of Brønsted acidic ionic liquids were identified.

Catalytic synthesis of methyl caprylate using multi-SO3H functionalized Brønsted acidic ionic liquid as catalyst

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Chen Keke ◽  
Du Huan ◽  
Zhang Jiawen ◽  
Zhang Xiaofang ◽  
Kuang Yingying ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Catalytic Synthesis ◽  
Environmentally Benign ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids

AbstractEnvironmentally benign Brønsted acidic ionic liquids with multi-SO

MOR zeolite supported Brønsted acidic ionic liquid: an efficient and recyclable heterogeneous catalyst for ketalization

RSC Advances ◽  
2014 ◽  
Vol 4 (24) ◽  
pp. 12160-12167 ◽  
Author(s):  
Zhang-Min Li ◽  
Yan Zhou ◽  
Duan-Jian Tao ◽  
Wei Huang ◽  
Xiang-Shu Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Recyclable Heterogeneous Catalyst ◽  
Supported Ionic Liquids

In order to widen the application of ionic liquids as efficient and renewable heterogeneous catalysts, supported ionic liquids (SILs) have received considerable attention.

Design of Brønsted acidic ionic liquid functionalized mesoporous organosilica nanospheres for efficient synthesis of ethyl levulinate and levulinic acid from 5-hydroxymethylfurfural

2021 ◽  
Author(s):  
Daiyu Song ◽  
Jingyu Liu ◽  
Chaoyue Zhang ◽  
Yihang Guo
Keyword(s):  
Ionic Liquid ◽  
Levulinic Acid ◽  
Catalytic Transformation ◽  
Efficient Synthesis ◽  
Practical Applications ◽  
Acidic Ionic Liquid ◽  
Mesoporous Organosilica ◽  
Brønsted Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Fuels And Chemicals

Brønsted acidic ionic liquids (BAILs) have brought new vitality in catalytic transformation of biomass to fuels and chemicals, but practical applications of BAILs suffer from drawbacks of slow diffusion and...

scholarly journals Dispersing of Petroleum Asphaltenes by Acidic Ionic Liquid and Determination by UV-Visible Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Eshagh Rezaee Nezhad ◽  
Fariba Heidarizadeh ◽  
Sami Sajjadifar ◽  
Zahra Abbasi
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Visible Spectroscopy ◽  
Acidic Ionic Liquid ◽  
Petroleum Asphaltenes ◽  
Effect Of Water ◽  
Acidic Ionic Liquids ◽  
Stirring Time ◽  
Uv Visible

Nowadays, constructing a mechanism to prevent the aggregation petroleum asphaltenes by the use of new acidic ionic liquids has become of fundamental importance. In this research, 3-(2-carboxybenzoyl)-1-methyl-1H-imidazol-3-ium chloride ([CbMIM] [Cl]) and other ionic liquids such as [CbMIM]BF4, [HMIM]Cl, [BMIM]Br, and [HMIM]HSO4 were tested. It should be noted that during the experiment the presence of the acidic ionic liquid moiety enhanced interactions between asphaltenes and acidic ionic liquids and it greatly limited asphaltene aggregation. We considered parameters such as temperature, amount of dispersant, effect of water: toluene ratio, the stirring time and effects of other ionic liquids, and determination of concentration of petroleum asphaltenes after dispersing by acidic ionic liquid under various parameters using UV-Visible spectroscopy.

Study of the Catalytic Activity of Acidic Ionic Liquid in the Synthesis of Methyl Oleate

2015 ◽  
Vol 1094 ◽  
pp. 31-36
Author(s):  
Yang Bo
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Oleic Acid ◽  
Acid Strength ◽  
Catalytic Activities ◽  
Acidic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Anions And Cations ◽  
Chemical Groups

Four kinds of Brønsted-acidic ionic liquids were synthesized with netrogen-contained chemical groups and different anions,and were characterized by nuclear magnetic resonance (NMR) and infrared spectrum (IR). On this basic, when the mole ratio of catalyst quantity to oleic acid was 0.019, that of alcohol to acid was 2, the reaction temperature was 150°C and the reaction time was 5 hours,the esterification of oleic and methanol were studied and the catalytic activities of ionic liquids for the esterification were investigated. The results showed their catalytic activities were associated with the structures of nitrogen-contained chemical groups, anionic acid strength and acid volume. Under the coaction of anions and cations, ionic liquids ([MPy]HSO4) had the best catalysis activity. Meanwhile the conversion rate of oleic acid could reach 88.21% .

1, 1’-Sulfinyldiethylammonium Bis (Hydrogen Sulfate) as a Recyclable Dicationic Ionic Liquid Catalyst for the Efficient Solvent-free Synthesis of 3, 4-Dihydropyrimidin-2(1H)-ones via Biginelli Reaction

2020 ◽  
Vol 23 (2) ◽  
pp. 157-167
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Biginelli Reaction ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Hydrogen Sulfate ◽  
One Pot ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Solvent Free Conditions ◽  
Dicationic Ionic Liquid

Objective: A facile and efficient method for synthesis of 3, 4-dihydropyrimidin-2(1H)-ones via Biginelli reaction catalyzed by a novel dicationic Brönsted acidic ionic liquid, [(EtNH2)2SO][HSO4]2, has been successfully developed. Material and Method:: 3, 4-Dihydropyrimidin-2(1H)-ones were synthesized through one-pot condensation of aromatic aldehydes, ethyl acetoacetate, and urea under solvent-free conditions using [(EtNH2)2SO][HSO4]2 as a novel catalyst. The progress of the reaction was monitored by thin-layer chromatography (ethyl acetate / n-hexane = 1 / 5). The products have been characterized by IR, 1H NMR, 13C NMR, and also by their melting points. Results: In this research, a library of dihydropyrimidinone derivatives was synthesized via Biginelli reaction under solvent-free conditions at 120oC using [(EtNH2)2SO][HSO4]2 as a catalyst. Various aromatic aldehydes, as well as heteroaromatic aldehydes, were employed, affording good to high yields of the corresponding products and illustrating the substrate generality of the present method. In addition, the prepared dicationic Brönsted acidic ionic liquid can be easily recovered and reused. Conclusion: 1, 1’-Sulfinyldiethylammonium bis (hydrogen sulfate), as a novel dicationic ionic liquid, can act as a highly efficient catalyst for the synthesis of 3, 4-dihydropyrimidin-2(1H)-ones under solvent-free conditions.

Synthesis and Characterization of a Novel Ionic Liquid Based on N,N,N,N-tetramethylethylenediamine and its Application in the Synthesis of 1,8-dioxo-octahydro Xanthenes

2018 ◽  
Vol 21 (7) ◽  
pp. 526-532 ◽  
Author(s):  
Zahra Abdi Piralghar ◽  
Mohammad Mahmoodi Hashemi ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Chlorosulfonic Acid ◽  
Solvent Free ◽  
Aryl Aldehydes ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Solvent Free Conditions ◽  
Aryl Aldehyde ◽  
High Yields

Aim and Objective: In this work, we synthesized and characterized a novel Brönsted acidic ionic liquid from the reaction of N, N, N’, N’-tetramethylethylenediamine with chlorosulfonic acid and explored its catalytic activity in 1, 8-dioxo-octahydroxanthenes synthesis. Materials and Methods: Dimedone, aryl aldehydes, and the ionic liquid as the catalyst were reacted under solvent-free conditions. The progressive of the reaction was monitored by a thin layer of chromatography (ethyl acetate/n-hexane = 1/5). All products were characterized as the basis of their spectra data and melting point by comparison with those reported in the literature. Results: The prepared ionic liquid was successfully applied in the synthesis of 1, 8-dioxooctahydroxanthenes in good to high yields on the reaction of aryl aldehyde and dimedone at 120oC under solvent-free conditions. Conclusion: This research demonstrates that the catalyst is impressive for 1, 8-dioxo-octahydroxanthenes synthesis under solvent-free conditions.

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