Sputtering-deposition of Ru nanoparticles onto Al2O3 modified with imidazolium ionic liquids: synthesis, characterisation and catalysis

2015 ◽  
Vol 44 (6) ◽  
pp. 2827-2834 ◽  
Author(s):  
Lucas Foppa ◽  
Leandro Luza ◽  
Aitor Gual ◽  
Daniel E. Weibel ◽  
Dario Eberhardt ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ruthenium Nanoparticles ◽  
Bulk Metal ◽  
Sputtering Deposition ◽  
Modified Alumina ◽  
Imidazolium Ionic Liquids ◽  
Ru Nanoparticles ◽  
Highly Active

Ruthenium nanoparticles obtained by sputtering deposition from the bulk metal onto an ionic-liquid modified alumina are highly active catalysts for the hydrogenation of benzene.

Acceleration of Baylis-Hillman reaction using ionic liquid supported organocatalyst

2021 ◽  
Vol 08 ◽  
Author(s):  
Vivek Srivastava
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Reaction Rate ◽  
Reaction Medium ◽  
Catalyst Loading ◽  
Catalyst Recycling ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Low Catalyst Loading

Background: Baylis-Hillman reaction suffers from the requirement of cheap starting materials, easy reaction protocol, possibility to create the chiral center in the reaction product has increased the synthetic efficacy of this reaction, and high catalyst loading, low reaction rate, and poor yield. Objective: The extensive use of various functional or non-functional ionic liquids (ILs) with organocatalyst increases the reaction rate of various organic transformations as a reaction medium and as a support to anchor the catalysts. Methods: In this manuscript, we have demonstrated the synthesis of quinuclidine-supported trimethylamine-based functionalized ionic liquid as a catalyst for the Baylis-Hillman reaction. Results: We obtained the Baylis-Hillman adducts in good, isolated yield, low catalyst loading, short reaction time, broad substrate scope, accessible product, and catalyst recycling. N-((E,3S,4R)-5-benzylidene-tetrahydro-4-hydroxy-6-oxo-2H-pyran-3-yl) palmitamide was also successfully synthesized using CATALYST-3 promoted Baylis-Hillman reaction. Conclusion: We successfully isolated the 25 types of Baylis-Hillman adducts using three different quinuclidine-supported ammonium-based ionic liquids such as Et3AmQ][BF4] (CATALYST-1), [Et3AmQ][PF6] (CATALYST-2), and [TMAAmEQ][NTf2](CATALYST-3) as new and efficient catalysts. Tedious and highly active N-((E,3S,4R)-5-benzylidene-tetrahydro-4-hydroxy-6-oxo-2H-pyran-3-yl) palmitamide derivative was also synthesized using CATALYST-3 followed by Baylis-Hillman reaction. Generally, all the responses demonstrated higher activity and yielded high competition with various previously reported homogenous and heterogeneous Catalytic systems. Easy catalyst and product recovery followed by six catalysts recycling were the added advantages of the prosed catalytic system.

scholarly journals The Influence of the Nature of Redox-Active Moieties on the Properties of Redox-Active Ionic Liquids and on Their Use as Electrolyte for Supercapacitors

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6344
Author(s):  
Philipp S. Borchers ◽  
Patrick Gerlach ◽  
Yihan Liu ◽  
Martin D. Hager ◽  
Andrea Balducci ◽  
...  
Keyword(s):  
Phase Transition ◽  
Differential Scanning Calorimetry ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Binary Mixtures ◽  
Thermal Characteristics ◽  
The Other ◽  
Scanning Calorimetry ◽  
Imidazolium Ionic Liquids ◽  
Redox Active

In this work, two new redox-active ionic liquids, one based on 2,2,6,6-tetramethylpiperidine-N-oxide and the other based on 4,4′-bipyridine, are synthesized and characterized. A ferrocene-based redox-active ionic liquid is used for referencing the results. All ionic liquids are formed via salt-metathesis from halogenate to bis(trifluoromethylsulfonyl)imide. Their fundamental thermal characteristics are assessed with differential scanning calorimetry. While the imidazolium ionic liquids show no melting point, the phase transition is well observable for the viologen-based ionic liquid. The properties of the neat redox-active ionic liquids and of binary mixtures containing these ionic liquids (0.1 m) and 1-butyl-1-methyl pyrrolidinium-bis(trifluoromethylsulfonyl)imide have been investigated. Finally, the use of these binary mixtures in combination with activated carbon-based electrodes has been considered in view of the use of these redox-active electrolytes in supercapacitors.

scholarly journals Ionic Liquid Catalyzed Per-O-Acetylation and Benzylidene Ring-Opening Reaction

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 642 ◽  
Author(s):  
Mayur Thul ◽  
Yao-Peng Wu ◽  
Yi-Jyun Lin ◽  
Shu-Lin Du ◽  
Hsin-Ru Wu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ring Opening ◽  
Room Temperature ◽  
Catalytic Amount ◽  
Atom Economy ◽  
Selective Catalyst ◽  
Imidazolium Ionic Liquids ◽  
Ring Opening Reaction ◽  
Brönsted Acid

Tunable aryl imidazolium ionic liquids acting as Brønsted acid ionic liquids were found to be efficient catalysts for per-O-acetylation and reductive ring opening of benzylidene acetals. This method requires a truly catalytic amount of the least expensive available ionic liquids that are water-stable and reusable and also stable at room temperature. The reactions were obtained in one hour with good to excellent yields. These reactions can form C−O and C−H bonds with a high atom economy. Furthermore, the ionic liquid is an anomeric selective catalyst in per-O-acetylation and reductive ring opening of benzylidene acetals of sugar moieties.

Organized 3D-alkyl imidazolium ionic liquids could be used to control the size of in situ generated ruthenium nanoparticles?

2009 ◽  
Vol 19 (22) ◽  
pp. 3624 ◽  
Author(s):  
Thibaut Gutel ◽  
Catherine C. Santini ◽  
Karine Philippot ◽  
Agilio Padua ◽  
Katrin Pelzer ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Ruthenium Nanoparticles ◽  
Imidazolium Ionic Liquids

Ionophilic phosphonium-appended carbopalladacycle catalyst for Suzuki–Miyaura and Heck cross-coupling catalysis

2010 ◽  
Vol 88 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Jocelyn J. Tindale ◽  
Paul J. Ragogna
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Catalyst Activity ◽  
Reaction Medium ◽  
Cross Coupling ◽  
Metal Catalyst ◽  
Phosphonium Salts ◽  
Transition Metal Catalyst ◽  
Imidazolium Ionic Liquids ◽  
Liquid Reaction

An ionic liquid, covalently tethered to an efficient transition-metal catalyst in the presence of an ionic liquid reaction medium, can utilize ionophilic interactions to improve catalyst activity, recyclability, and product isolation while decreasing catalyst leaching. Given the greater stability of phosphonium salts in comparison to imidazolium ionic liquids under basic conditions, phosphonium-tagged oxime carbopalladacycle salts were prepared and employed in both Heck and Suzuki–Miyaura reactions. The desired product was obtained in good yields for up to four catalyst cycles in the case of the Suzuki–Miyaura reaction. While taking advantage of the non-volatile nature of ionic liquids, the product was isolated through simple sublimation from the reaction mixture, eliminating issues associated with catalyst leaching, and the remaining ionic liquid solvent–catalyst mixture was ready for further catalysis.

scholarly journals 2D assemblies of ionic liquid crystals based on imidazolium moieties: formation of ion-conductive layers

2015 ◽  
Vol 39 (6) ◽  
pp. 4471-4477 ◽  
Author(s):  
Junji Sakuda ◽  
Masafumi Yoshio ◽  
Takahiro Ichikawa ◽  
Hiroyuki Ohno ◽  
Takashi Kato
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystals ◽  
Ionic Conductivity ◽  
Imidazolium Ionic Liquids ◽  
Ionic Liquid Crystals

Organization of imidazolium ionic liquids into 2D ion-conductive pathways enhances the ionic conductivity of the imidazolium-based ionic liquid crystals.

Plasmonic behavior of ionic liquid stabilized gold nanoparticles in molecular solvents

2017 ◽  
Vol 41 (21) ◽  
pp. 12989-12995 ◽  
Author(s):  
Sachin Thawarkar ◽  
Balu Thombare ◽  
Nageshwar D. Khupse
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Surface Plasmon Resonance ◽  
Dielectric Properties ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Facile Synthesis ◽  
Imidazolium Ionic Liquids ◽  
Molecular Solvents

In this paper, we have demonstrated the facile synthesis of stable gold nanoparticles (AuNPs) using imidazolium ionic liquids (ImILs) as a stabilizer as well as a surfactant and their surface plasmon resonance (SPR) in different molecular solvents with varying dielectric properties.

Synthesis and Characterization of Supported on Silica Based Ionic Liquids

2015 ◽  
Vol 727-728 ◽  
pp. 34-37
Author(s):  
Li Ying Guo ◽  
Jun Shi ◽  
Jun Hai He ◽  
Ji Yue Huang ◽  
Peng Cheng Huang
Keyword(s):  
Crystal Structure ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Chemical Structure ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Imidazolium Ionic Liquid ◽  
Imidazolium Ionic Liquids ◽  
Methyl Imidazole

Three kinds of functionalized imidazolium ionic liquid, 1-chloride (2-hydroxyethyl) -3-methyl imidazole ionic liquid [HeMIM]Cl, 1-bromide ethylamine-3-methyl imidazolium ionic liquid [AeMIM]Br and chlorinated 1-carboxyethyl-3-methyl imidazolium ionic liquid [CeMIM]Cl, were synthesized firstly. Subsequently, three kinds of supported silicon imidazolium ionic liquids were prepared from above ionic liquids with tetraethoxysilane by sol-gel method. The Chemical structure and crystal structure of the supported on silica based ionic liquids were analyzed by FTIR and XRD.

scholarly journals Tunable Aryl Imidazolium Recyclable Ionic Liquid with Dual Brønsted–Lewis Acid as Green Catalyst for Friedel–Crafts Acylation and Thioesterification

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 352 ◽  
Author(s):  
Yi-Jyun Lin ◽  
Yao-Peng Wu ◽  
Mayur Thul ◽  
Ming-Wei Hung ◽  
Shih-Huan Chou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Activity ◽  
Lewis Acid ◽  
Atom Economy ◽  
Green Catalyst ◽  
Imidazolium Ionic Liquids ◽  
Catalytic Activities ◽  
Essential Reactions

Unique tunable aryl imidazolium ionic liquids successfully catalyzed Friedel–Crafts acylation and thioesterification in sealed tubes. These reactions can form a C−C bond and a C−S bond with high atom economy. Ionic liquids exhibited high activity and catalyzed essential reactions with good to excellent yields while retaining their catalytic activities for recycling.

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