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Catalysts
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Ionic Liquids in Catalysis 2015
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Ionic Liquids in Catalysis 2015

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (31 October 2015) | Viewed by 10209

Special Issue Editor

Dr. Jason P. Hallett

E-Mail Website
Guest Editor
Department of Chemical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
Interests: ionic liquids; biopolymers; biomass fractionation; cellulose; plastic depolymerization; sustainable processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ionic liquids have benefited from an explosion of interest in recent years. Applications include electrochemistry, biofuels, and carbon capture; these applications have caught the interest of chemists worldwide. However, ionic liquids owe much of their sustained success to their involvement in the field of catalysis, where they first developed a following in the 1990s. From the uses of ionic liquids as solvents for catalysis, to catalyst activators, catalyst recycling media, and even as catalysts themselves, ionic liquids have become exciting media for promoting catalytic chemistry research. This has included research on homogeneous and heterogeneous catalysis, and also on nanoparticle catalysis and recently, biocatalysis. The acidic and basic functionalities built into these tailor-made solvents have also been utilized to activate catalysts, promote certain selectivities, and even to act as catalytically active agents.

In this Special Issue, we focus on the uses of ionic liquids as solvents capable of promoting catalytic reactions, with all types of catalytic chemistries. The role of the ionic liquid as a solvent, and its special interactions with the catalytic species, and the role in catalytic cycles, will be of special interest. Ionic liquid uses in all application areas are welcome, and the emerging role of ionic liquids in the new frontiers of catalysis will be the key to unlocking the use of these exciting new solvents, which activate new catalytic frontiers.

Dr Jason Hallett
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


Keywords

  • ionic liquids
  • catalyst recycling
  • green chemistry

Published Papers (2 papers)

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Research

335 KiB  
Communication
Ionic Liquids as Carbene Catalyst Precursors in the One-Pot Four-Component Assembly of Oxo Triphenylhexanoates (OTHOs)
by Anton Axelsson, Linda Ta and Henrik Sundén
Catalysts 2015, 5(4), 2052-2067; https://doi.org/10.3390/catal5042052 - 27 Nov 2015
Cited by 10 | Viewed by 5414
Abstract
Ionic liquids (ILs) are a convenient and inexpensive source of N-heterocyclic carbenes (NHCs). In this study, dialkyl imidazolium-based ILs are used as carbene precursors in a four-component synthesis of oxo triphenylhexanoates (OTHOs), where it was found that IL outperformed commonly used NHC precatalysts [...] Read more.
Ionic liquids (ILs) are a convenient and inexpensive source of N-heterocyclic carbenes (NHCs). In this study, dialkyl imidazolium-based ILs are used as carbene precursors in a four-component synthesis of oxo triphenylhexanoates (OTHOs), where it was found that IL outperformed commonly used NHC precatalysts in terms of reaction efficiency. The reaction is highly stereoselective, delivering the anti-diastereomer (20:1 dr), and the OTHOs can be obtained in high-to-excellent yields. By virtue of the four-component reaction-setup, facile construction of the OTHO scaffold with a diverse set of functional groups (21 examples) can be achieved. In the context of sustainability, the IL can be recovered and reused several times without affecting selectivity or yield. Moreover, most compounds can be isolated by precipitation and filtration, mitigating the use of solvent-demanding chromatography. Full article
(This article belongs to the Special Issue Ionic Liquids in Catalysis 2015)
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73 KiB  
Article
PEG1000-Based Dicationic Acidic Ionic Liquid Catalyzed One-Pot Synthesis of 4-Aryl-3-Methyl-1-Phenyl-1H-Benzo[h]pyrazolo [3,4-b]quinoline-5,10-Diones via Multicomponent Reactions
by Yi-Ming Ren, Shuo Jin, Hai-Jun Yan and Ze Zhang
Catalysts 2015, 5(4), 1649-1656; https://doi.org/10.3390/catal5041649 - 25 Sep 2015
Cited by 14 | Viewed by 4495
Abstract
A novel and green approach for efficient and rapid synthesis of 4-aryl-3-methyl-1-phenyl-1H-benzo[h]pyrazolo[3,4-b]quinoline-5,10-diones has been accomplished by the one-pot condensation reaction of aromatic aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5-amine and 2-hydroxynaphthalene-1,4-dione using PEG1000-based dicationic acidic ionic liquid (PEG [...] Read more.
A novel and green approach for efficient and rapid synthesis of 4-aryl-3-methyl-1-phenyl-1H-benzo[h]pyrazolo[3,4-b]quinoline-5,10-diones has been accomplished by the one-pot condensation reaction of aromatic aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5-amine and 2-hydroxynaphthalene-1,4-dione using PEG1000-based dicationic acidic ionic liquid (PEG1000-DAIL) as a catalyst was reported. Recycling studies have shown that the PEG1000-DAIL can be readily recovered and reused several times without significant loss of activity. The key advantages are the short reaction time, high yields, simple workup, and recovered catalyst. Full article
(This article belongs to the Special Issue Ionic Liquids in Catalysis 2015)
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