1
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Blaga AC, Tucaliuc A, Kloetzer L. Applications of Ionic Liquids in Carboxylic Acids Separation. MEMBRANES 2022; 12:membranes12080771. [PMID: 36005686 PMCID: PMC9414664 DOI: 10.3390/membranes12080771] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 07/31/2022] [Accepted: 08/04/2022] [Indexed: 05/26/2023]
Abstract
Ionic liquids (ILs) are considered a green viable organic solvent substitute for use in the extraction and purification of biosynthetic products (derived from biomass-solid/liquid extraction, or obtained through fermentation-liquid/liquid extraction). In this review, we analyzed the ionic liquids (greener alternative for volatile organic media in chemical separation processes) as solvents for extraction (physical and reactive) and pertraction (extraction and transport through liquid membranes) in the downstream part of organic acids production, focusing on current advances and future trends of ILs in the fields of promoting environmentally friendly products separation.
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2
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Damodaran K. Recent advances in NMR spectroscopy of ionic liquids. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2022; 129:1-27. [PMID: 35292132 DOI: 10.1016/j.pnmrs.2021.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 12/17/2021] [Accepted: 12/28/2021] [Indexed: 06/14/2023]
Abstract
This review presents recent developments in the application of NMR spectroscopic techniques in the study of ionic liquids. NMR has been the primary tool not only for the structural characterization of ionic liquids, but also for the study of dynamics. The presence of a host of NMR active nuclei in ionic liquids permits widespread use of multinuclear NMR experiments. Chemical shifts and multinuclear coupling constants are used routinely for the structure elucidation of ionic liquids and of products formed by their covalent interactions with other materials. Also, the availability of a multitude of NMR techniques has facilitated the study of dynamical processes in them. These include the use of NOESY to study inter-ionic interactions, pulsed-field gradient techniques for probing transport properties, and relaxation measurements to elucidate rotational dynamics. This review will focus on the application of each of these techniques to investigate ionic liquids.
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Affiliation(s)
- Krishnan Damodaran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, United States.
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3
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Abstract
Despite the progress achieved by aqueous biphasic systems (ABSs) comprising ionic liquids (ILs) in extracting valuable proteins, the quest for bio-based and protein-friendly ILs continues. To address this need, this work uses natural organic acids as precursors in the synthesis of four ILs, namely tetrabutylammonium formate ([N4444][HCOO]), tetrabutylammonium acetate ([N4444][CH3COO]), tetrabutylphosphonium formate ([P4444][HCOO]), and tetrabutylphosphonium acetate ([P4444][CH3COO]). It is shown that ABSs can be prepared using all four organic acid-derived ILs paired with the salts potassium phosphate dibasic (K2HPO4) and tripotassium citrate (C6H5K3O7). According to the ABSs phase diagrams, [P4444]-based ILs outperform their ammonium congeners in their ability to undergo liquid–liquid demixing in the presence of salts due to their lower hydrogen-bond acidity. However, deviations to the Hofmeister series were detected in the salts’ effect, which may be related to the high charge density of the studied IL anions. As a proof of concept for their extraction potential, these ABSs were evaluated in extracting human transferrin, allowing extraction efficiencies of 100% and recovery yields ranging between 86 and 100%. To further disclose the molecular-level mechanisms behind the extraction of human transferrin, molecular docking studies were performed. Overall, the salting-out exerted by the salt is the main mechanism responsible for the complete extraction of human transferrin toward the IL-rich phase, whereas the recovery yield and protein-friendly nature of these systems depend on specific “IL-transferrin” interactions.
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4
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Wu D, Ma C, Fan GC, Pan F, Tao Y, Kong Y. Recent advances of the ionic chiral selectors for chiral resolution by chromatography, spectroscopy and electrochemistry. J Sep Sci 2021; 45:325-337. [PMID: 34117714 DOI: 10.1002/jssc.202100334] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/08/2021] [Accepted: 06/08/2021] [Indexed: 01/06/2023]
Abstract
Ionic chiral selectors have been received much attention in the field of asymmetric catalysis, chiral recognition, and preparative separation. It has been shown that the addition of ionic chiral selectors can enhance the recognition efficiency dramatically due to the presence of multiple intermolecular interactions, including hydrogen bond, π-π interaction, van der Waals force, electrostatic ion-pairing interaction, and ionic-hydrogen bond. In the initial research stage of the ionic chiral selectors, most of work center on the application in chromatographic separation (capillary electrophoresis, high-performance liquid chromatography, and gas chromatography). Differently, more and more attention has been paid on the spectroscopy (nuclear magnetic resonance, fluorescence, ultraviolet and visible absorption spectrum, and circular dichroism spectrum) and electrochemistry in recent years. In this tutorial review as regards the ionic chiral selectors, we discuss in detail the structural features, properties, and their application in chromatography, spectroscopy, and electrochemistry.
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Affiliation(s)
- Datong Wu
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Cong Ma
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Gao-Chao Fan
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Qingdao University of Science and Technology, Qingdao, P. R. China
| | - Fei Pan
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Yongxin Tao
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
| | - Yong Kong
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, P. R. China
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5
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Zullo V, Iuliano A, Guazzelli L. Sugar-Based Ionic Liquids: Multifaceted Challenges and Intriguing Potential. Molecules 2021; 26:2052. [PMID: 33916695 PMCID: PMC8038380 DOI: 10.3390/molecules26072052] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 03/26/2021] [Accepted: 03/29/2021] [Indexed: 01/29/2023] Open
Abstract
Carbohydrates represent a promising option in transitioning from oil-based chemical resources to renewable ones, with the goal of developing chemistries for a sustainable future. Cellulose, hemicellulose, and largely available monosaccharides already provide useful chemical building blocks, so-called platform chemicals, such as levulinic acid and hydroxymethyl furfural, as well as solvents like cyrene or gamma-valerolactone. Therefore, there is great anticipation for novel applications involving materials and chemicals derived from sugars. In the field of ionic liquids (ILs), sugar-based ILs have been overlooked for a long time, mainly on account of their multistep demanding preparation. However, exploring new strategies for accessing sugar-based ILs, their study, and their exploitation, are attracting increasing interest. This is due to the growing concerns about the negative (eco)toxicity profile of most ILs in conjunction with their non-sustainable nature. In the present review, a literature survey concerning the development of sugar-based ILs since 2011 is presented. Their preparation strategies and thermal behavior analyses, sorted by sugar type, make up the first two sections with the intention to provide the reader with a useful guide. A final overview of the potential applications of sugar-based ILs and their future perspectives complement the present analysis.
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Affiliation(s)
- Valerio Zullo
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy; (V.Z.); (A.I.)
| | - Anna Iuliano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy; (V.Z.); (A.I.)
| | - Lorenzo Guazzelli
- Dipartimento di Farmacia, Università di Pisa, via Bonanno 33, 56126 Pisa, Italy
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6
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Zullo V, Górecki M, Guazzelli L, Mezzetta A, Pescitelli G, Iuliano A. Exploiting isohexide scaffolds for the preparation of chiral ionic liquids tweezers. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114528] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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7
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Muthukuru P, P. K, Rayadurgam J, Rajasekhara Reddy S. Naturally derived sugar-based ionic liquids: an emerging tool for sustainable organic synthesis and chiral recognition. NEW J CHEM 2021. [DOI: 10.1039/d1nj03914h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In the past decade, the synthesis of sugar-based ionic liquids (SILs) from natural sugars has been described as a promising strategy.
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Affiliation(s)
- Priyanka Muthukuru
- Department of Chemistry, Vellore Institute of Technology (VIT), Vellore-632014, India
| | - Krishnaraj P.
- Department of Chemistry, Vellore Institute of Technology (VIT), Vellore-632014, India
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8
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Komabayashi M, Nokami T, Jopp S. From Chitin to CHILs: First Glucosamine based Ionic Liquids. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000569] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mirai Komabayashi
- Department of Chemistry and Biotechnology Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori City, 680–8552 Tottori Japan
| | - Toshiki Nokami
- Department of Chemistry and Biotechnology Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori City, 680–8552 Tottori Japan
| | - Stefan Jopp
- Department of Technical and Analytical Chemistry Institute of Chemistry University of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
- Department of Chemistry and Biotechnology Graduate School of Engineering Tottori University 4-101 Koyamachominami Tottori City, 680–8552 Tottori Japan
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9
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Gupta R, Gonnade RG, Bedekar AV. Effect of Substituent of Roof Shape Amines on the Molecular Recognition of Optically Active Acids by NMR Spectroscopy. ChemistrySelect 2020. [DOI: 10.1002/slct.202003338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Riddhi Gupta
- Department of Chemistry Faculty of Science The Maharaja Sayajirao University of Baroda Vadodara 390 002 India
| | - Rajesh G. Gonnade
- Center for Materials Characterization CSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune 411 008 India
| | - Ashutosh V. Bedekar
- Department of Chemistry Faculty of Science The Maharaja Sayajirao University of Baroda Vadodara 390 002 India
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10
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Affiliation(s)
- Stefan Jopp
- Department of Technical and Analytical Chemistry Institute of Chemistry University of Rostock Albert‐Einstein‐Str. 3a Rostock Germany
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11
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Gaida B, Brzęczek-Szafran A. Insights into the Properties and Potential Applications of Renewable Carbohydrate-Based Ionic Liquids: A Review. Molecules 2020; 25:E3285. [PMID: 32698359 PMCID: PMC7397332 DOI: 10.3390/molecules25143285] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 11/16/2022] Open
Abstract
Carbohydrate-derived ionic liquids have been explored as bio-alternatives to conventional ionic liquids for over a decade. Since their discovery, significant progress has been made regarding synthetic methods, understanding their environmental effect, and developing perspectives on their potential applications. This review discusses the relationships between the structural properties of carbohydrate ionic liquids and their thermal, toxicological, and biodegradability characteristics in terms of guiding future designs of sugar-rich systems for targeted applications. The synthetic strategies related to carbohydrate-based ionic liquids, the most recent relevant advances, and several perspectives for possible applications spanning catalysis, biomedicine, ecology, biomass, and energy conversion are presented herein.
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Affiliation(s)
| | - Alina Brzęczek-Szafran
- Department of Chemical Organic Technology and Petrochemistry, Silesian University of Technology, 44100 Gliwice, Poland;
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12
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Flieger J, Feder-Kubis J, Tatarczak-Michalewska M. Chiral Ionic Liquids: Structural Diversity, Properties and Applications in Selected Separation Techniques. Int J Mol Sci 2020; 21:E4253. [PMID: 32549300 PMCID: PMC7352568 DOI: 10.3390/ijms21124253] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/10/2020] [Accepted: 06/12/2020] [Indexed: 12/21/2022] Open
Abstract
Ionic liquids (ILs) are chemical compounds composed of ions with melting points below 100 °C exhibiting a design feature. ILs are commonly used as the so-called green solvents, reagents or highly efficient catalysts in varied chemical processes. The huge application potential of ionic liquids (IL) justifies the growing interest in these compounds. In the last decade, increasing attention has been devoted to the development of new methods in the synthesis of stable chiral ionic liquids (CILs) and their application in various separation techniques. The beginnings of the successful use of CILs to separate enantiomers date back to the 1990 s. Most chiral ILs are based on chiral cations or chiral anions. There is also a limited number of CILs possessing both a chiral cation and a chiral anion. Due to the high molecular diversity of both ions, of which at least one has a chiral center, we have the possibility to design a large variety of optically active structures, thus expanding the range of CIL applications. Research utilizing chiral ionic liquids only recently has become more popular. However, it is the area that still has great potential for future development. This review aimed to describe the diversity of structures, properties and examples of applications of chiral ionic liquids as new chiral solid materials and chiral components of the anisotropic environment, providing chiral recognition of enantiomeric analytes, which is useful in liquid chromatography, countercurrent chromatography and other various CIL-based extraction techniques including aqueous biphasic (ABS) extraction systems, solid-liquid two-phase systems, liquid-liquid extraction systems with hydrophilic CILs, liquid-liquid extraction systems with hydrophobic CILs, solid-phase extraction and induced-precipitation techniques developed in the recent years. The growing demand for pure enantiomers in the pharmaceutical and food industries sparks further development in the field of extraction and separation systems modified with CILs highlighting them as affordable and environmentally friendly both chiral selectors and solvents.
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Affiliation(s)
- Jolanta Flieger
- Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland;
| | - Joanna Feder-Kubis
- Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wrocław University of Science and Technology, 50-370 Wrocław, Poland;
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13
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Reiß M, Brietzke A, Eickner T, Stein F, Villinger A, Vogel C, Kragl U, Jopp S. Synthesis of novel carbohydrate based pyridinium ionic liquids and cytotoxicity of ionic liquids for mammalian cells. RSC Adv 2020; 10:14299-14304. [PMID: 35498491 PMCID: PMC9051878 DOI: 10.1039/d0ra01370f] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 03/18/2020] [Indexed: 11/21/2022] Open
Abstract
The large pool of naturally occurring carbohydrates with their diversity in chirality and structure led to the idea of a systematic investigation of carbohydrate based ILs. To this end, we investigated the influence of different ether groups, mainly methyl or ethyl ether, on the secondary OH groups as well as different configurations on physical properties such as melting point, thermostability and especially the influence on cell toxicity. For this investigation we chose α- and β-methyl-, β-allyl- and β-phenyl d-glucopyranose as well as four 1-deoxy-pentoses. In order to be able to classify the results, more ionic liquids with different structural motives were examined for cytotoxicity. Here, we present data that confirm the biocompatibility of such ILs consisting of naturally occurring molecules or their derivatives. The synthesized carbohydrate based ILs were tested for their suitability as additives in coatings for medical applications such as drug-eluting balloons.
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Affiliation(s)
- Melanie Reiß
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
| | - Andreas Brietzke
- Institute of Biomedical Engineering, University of Rostock Friedrich-Barnewitz-Straße 4 18119 Rostock Germany
| | - Thomas Eickner
- Institute of Biomedical Engineering, University of Rostock Friedrich-Barnewitz-Straße 4 18119 Rostock Germany
| | - Florian Stein
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
| | - Alexander Villinger
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
| | - Christian Vogel
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
| | - Udo Kragl
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
| | - Stefan Jopp
- Institute of Chemistry, University of Rostock Albert-Einstein-Straße 3a 18059 Rostock Germany
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14
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Synthesis and applications of carbohydrate based chiral ionic liquids as chiral recognition agents and organocatalysts. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111994] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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15
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Nemcsok T, Rapi Z, Bagi P, Bakó P. Synthesis and application of novel carbohydrate-based ammonium and triazolium salts. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1625403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Tamás Nemcsok
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Zsolt Rapi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Péter Bakó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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16
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Sintra TE, Gantman MG, Ventura SP, Coutinho JA, Wasserscheid P, Schulz PS. Synthesis and characterization of chiral ionic liquids based on quinine, l-proline and l-valine for enantiomeric recognition. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.084] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Singh A, Kaur N, Kumar Chopra H. Chiral Recognition Methods in Analytical Chemistry: Role of the Chiral Ionic Liquids. Crit Rev Anal Chem 2019; 49:553-569. [DOI: 10.1080/10408347.2019.1565985] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Avtar Singh
- Department of Chemistry, Sant Longowal Institute of Engineering and Technology, Longowal, India
| | - Nirmaljeet Kaur
- Department of Chemistry, Sant Longowal Institute of Engineering and Technology, Longowal, India
| | - Harish Kumar Chopra
- Department of Chemistry, Sant Longowal Institute of Engineering and Technology, Longowal, India
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18
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Greño M, Salgado A, Castro‐Puyana M, Marina ML. Nuclear magnetic resonance to study the interactions acting in the enantiomeric separation of homocysteine by capillary electrophoresis with a dual system of γ‐cyclodextrin and the chiral ionic liquid EtCholNTf2. Electrophoresis 2019; 40:1913-1920. [DOI: 10.1002/elps.201800483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 03/15/2019] [Accepted: 03/18/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Maider Greño
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
| | - Antonio Salgado
- Centro de Espectroscopía de Resonancia Magnética Nuclear (CERMN)Centro de Apoyo a la Investigación en QuímicaUniversidad de Alcalá Ctra. Madrid Spain
| | - María Castro‐Puyana
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
- Instituto de Investigación Química Andrés M. del Río. Universidad de Alcalá. Ctra. Madrid‐Barcelona Alcalá de Henares Madrid Spain
| | - María Luisa Marina
- Departamento de Química AnalíticaQuímica Física e Ingeniería Química. Facultad de CienciasUniversidad de Alcalá. Ctra. Alcalá de Henares Madrid Spain
- Instituto de Investigación Química Andrés M. del Río. Universidad de Alcalá. Ctra. Madrid‐Barcelona Alcalá de Henares Madrid Spain
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19
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Singh A, Chopra HK. Synthesis, characterization and applications of some novel DMAP-based chiral ionic liquids. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.06.058] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Mumtaz S, Cano I, Mumtaz N, Abbas A, Dupont J, Gondal HY. Supramolecular interaction of non-racemic benzimidazolium based ion pairs with chiral substrates. Phys Chem Chem Phys 2018; 20:20821-20826. [PMID: 30059112 DOI: 10.1039/c8cp03881c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of novel benzimidazolium-based non-racemic ionic liquids (ILs) was synthesized from low-cost chiral terpenoid alcohols and fully characterized by the use of a wide variety of techniques, such as DSC, ESI-MS, ATR FT-IR, polarimetry as well as 1H and 13C NMR spectroscopy. The ILs were investigated as chiral shift agents for the chiral recognition of racemic mixtures of Mosher's acid potassium salt by 19F NMR spectroscopy, leading to high splitting values of the CF3 signal. Supramolecular interactions between salt and H-C2 of chiral benzimidazolium cation are responsible for the chiral recognition, as was demonstrated by experimental evidences. Indeed, the enantiomeric excess value of enantioenriched substrates depends mainly on the strength of the contact ion pairs.
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Affiliation(s)
- Salma Mumtaz
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan. and GSK Carbon Neutral Laboratory for Sustainable Chemistry, University of Nottingham, NG7 2GA, Nottingham, UK.
| | - Israel Cano
- GSK Carbon Neutral Laboratory for Sustainable Chemistry, University of Nottingham, NG7 2GA, Nottingham, UK.
| | - Nargis Mumtaz
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan.
| | - Ahmed Abbas
- H.E.J. Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
| | - Jairton Dupont
- GSK Carbon Neutral Laboratory for Sustainable Chemistry, University of Nottingham, NG7 2GA, Nottingham, UK. and Laboratory of Molecular Catalysis, Institute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, RS, Brazil.
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21
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Chen Z, Fan H, Yang S, Bian G, Song L. Chiral sensors for determining the absolute configurations of α-amino acid derivatives. Org Biomol Chem 2018; 16:8311-8317. [DOI: 10.1039/c8ob01933a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Two simple 1H NMR tests give the absolute configurations of α-amino acids.
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Affiliation(s)
- Zhongxiang Chen
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Hongjun Fan
- The State Key Lab of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- P. R. China
| | - Shiwei Yang
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
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22
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Ito S, Okuno M, Asami M. Differentiation of enantiomeric anions by NMR spectroscopy with chiral bisurea receptors. Org Biomol Chem 2018; 16:213-222. [DOI: 10.1039/c7ob02318a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Enantiomeric 1H NMR signals of chiral anions are separated by forming 1 : 1 and 1 : 2 host–guest complexes with chiral bisurea.
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Affiliation(s)
- Suguru Ito
- Department of Advanced Materials Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Manami Okuno
- Department of Advanced Materials Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Masatoshi Asami
- Department of Advanced Materials Chemistry
- Graduate School of Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
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23
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Muralidhar B, Reddy SR. Zn(II) Chloride Promoted Benzannulation Strategy for One‐Pot Regioselective Synthesis of 6 H‐Benzo[ c]chromenes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700311] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Baitinti Muralidhar
- Department of chemistrySchool of Advanced Sciences, VIT University Vellore 632014 India
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Recent Advances in Multinuclear NMR Spectroscopy for Chiral Recognition of Organic Compounds. Molecules 2017; 22:molecules22020247. [PMID: 28178223 PMCID: PMC6155827 DOI: 10.3390/molecules22020247] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 01/26/2017] [Accepted: 01/30/2017] [Indexed: 12/17/2022] Open
Abstract
Nuclear magnetic resonance (NMR) is a powerful tool for the elucidation of chemical structure and chiral recognition. In the last decade, the number of probes, media, and experiments to analyze chiral environments has rapidly increased. The evaluation of chiral molecules and systems has become a routine task in almost all NMR laboratories, allowing for the determination of molecular connectivities and the construction of spatial relationships. Among the features that improve the chiral recognition abilities by NMR is the application of different nuclei. The simplicity of the multinuclear NMR spectra relative to 1H, the minimal influence of the experimental conditions, and the larger shift dispersion make these nuclei especially suitable for NMR analysis. Herein, the recent advances in multinuclear (19F, 31P, 13C, and 77Se) NMR spectroscopy for chiral recognition of organic compounds are presented. The review describes new chiral derivatizing agents and chiral solvating agents used for stereodiscrimination and the assignment of the absolute configuration of small organic compounds.
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Naidu S, Reddy SR. A Green and Recyclable Copper and Ionic Liquid Catalytic System for the Construction of Poly-heterocyclic Compounds viaOne-pot Tandem Coupling Reaction. ChemistrySelect 2017. [DOI: 10.1002/slct.201601872] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Shivaji Naidu
- Department of chemistry; School of Advanced Sciences; VITUniversity; Vellore 632014 India
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Jayachandra R, Reddy SR, Balakrishna. Natural Sugars Derived Chiral Ionic Liquids for Asymmetric Michael Addition Reaction. ChemistrySelect 2016. [DOI: 10.1002/slct.201600427] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- R. Jayachandra
- Department of Chemistry; School of Advanced Sciences; VIT-University; Vellore- 632014 Tamilnadu India
| | | | - Balakrishna
- Crop Protection Division (CPC); CSIR-Indian Institute of Chemical Technology; Tarnaka Hyderabad- 500007 Telangana India
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Sridhar P, Alagumuthu M, Arumugam S, Reddy SR. Synthesis of quinoline acetohydrazide-hydrazone derivatives evaluated as DNA gyrase inhibitors and potent antimicrobial agents. RSC Adv 2016. [DOI: 10.1039/c6ra09891f] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
(E)-N′-(Substituted-benzylidene)-2-(7-fluoro-2-methoxyquinolin-8-yl)acetohydrazide-hydrazone derivatives9a–nrepresent a new series of antibacterial agents and DNA gyrase inhibitors.
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Affiliation(s)
- P. Sridhar
- Department of Chemistry
- School of Advanced Sciences
- VIT University
- Vellore – 632014
- India
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28
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Naidu S, Reddy SR. Copper-catalyzed tandem reaction in ionic liquid: an efficient reusable catalyst and solvent media for the synthesis of fused poly hetero cyclic compounds. RSC Adv 2016. [DOI: 10.1039/c6ra13712a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Herein we report a copper catalyzed tandem reaction for the therapeutically important pyrrolo-/pyrido[2,1-b] benzo[d][1,3]oxazin-1-ones using 2-aminobezyl alcohols, green solvent medium, alkynoic acids, under ligand and base free conditions.
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Affiliation(s)
- Shivaji Naidu
- Department of Chemistry
- School of Advanced Sciences
- VIT University
- Vellore 632014
- India
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