1
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Yoneda N, Iyama H, Nagata T, Katahira M, Ishii Y, Tada K, Matsumoto K, Hagiwara R. Fluoride Ion in Alcohols: Isopropanol vs Hexafluoroisopropanol. J Phys Chem Lett 2024; 15:1677-1685. [PMID: 38315662 DOI: 10.1021/acs.jpclett.3c03619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
The utility of alcohol as a hydrogen bonding donor is considered a providential avenue for moderating the high basicity and reactivity of the fluoride ion, typically used with large cations. However, the practicality of alcohol-fluoride systems in reactions is hampered by the limited understanding of the pertinent interactions between the OH group and F-. Therefore, this study comparatively investigates the thermal, structural, and physical properties of the CsF-2-propanol and CsF-1,1,1,3,3,3-hexafluoro-2-propanol systems to explicate the effects of the fluoroalkyl group on the interaction of alcohols and F-. The two systems exhibit vastly different phase diagrams despite the similar saturated concentrations. A combination of spectroscopic analyses, alcohol activity coefficient measurements, and theoretical calculations reveal the fluorinated alcohol system harbors the stronger OH···F- interactions between the two systems. The diffusion coefficient and ionic conductivity measurements attribute the present results to disparate states of ion association in the two systems.
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Affiliation(s)
- Nozomi Yoneda
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Haruka Iyama
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takashi Nagata
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Masato Katahira
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yoshiki Ishii
- School of Frontier Engineering, Kitasato University, 1-15-1 Kitazato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Kohei Tada
- Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Kazuhiko Matsumoto
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rika Hagiwara
- Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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2
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Galland N, Laurence C, Le Questel JY. The p KBHX Hydrogen-Bond Basicity Scale: From Molecules to Anions. J Org Chem 2022; 87:7264-7273. [PMID: 35580340 DOI: 10.1021/acs.joc.2c00469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The pKBHX (logarithm of complexation constant K of 4-fluorophenol with bases) hydrogen-bond basicity scale of neutral hydrogen-bond acceptors (HBAs) is extended to anionic HBAs. The scale is constructed for 26 anions through (i) the infrared measurement of K on NBu4+X- ion pairs in CCl4, (ii) the estimation of K from linear free energy relationships between measured K values and literature K values for various phenols in polar solvents, and (iii) the computation of K at the density functional theory level in CCl4. The scale extends on a 9.4 pK unit range from fluoride to tetraphenylborate. Considering a number of anions as organic functions substituted with unipolar substituents, their pKBHX values can be related to the Hammett-Taft substituent constants σ. Unipolar substituents (O- and S-) obey the same pKBHX versus σ relationships as dipolar ionic (N-N+R3) and dipolar (OH, CF3, NR2, or OR) ones for the nitrile, carbonyl, nitroso, nitro, sulfonyl, and phosphoryl functions. Like dipolar substituents, unipolar substituents at carbon and nitrogen operate by field-inductive and resonance effects, whereas substituents at sulfur and phosphorus operate only by the field-inductive effect.
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Affiliation(s)
- Nicolas Galland
- Nantes Université, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France
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3
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4
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Tetramethylammonium Fluoride: Fundamental Properties and Applications in C-F Bond-Forming Reactions and as a Base. Catalysts 2022. [DOI: 10.3390/catal12020233] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nucleophilic ionic sources of fluoride are essential reagents in the synthetic toolbox to access high added-value fluorinated building blocks unattainable by other means. In this review, we provide a concise description and rationale of the outstanding features of one of these reagents, tetramethylammonium fluoride (TMAF), as well as disclosing the different methods for its preparation, and how its physicochemical properties and solvation effects in different solvents are intimately associated with its reactivity. Furthermore, herein we also comprehensively describe its historic and recent utilization, up to December 2021, in C-F bond-forming reactions with special emphasis on nucleophilic aromatic substitution fluorinations with a potential sustainable application in industrial settings, as well as its use as a base capable of rendering unprecedented transformations.
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5
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Hawk MK, Ryan SJ, Zhang X, Huang P, Chen J, Liu C, Chen J, Lindsay-Scott PJ, Burnett J, White C, Lu Y, Rizzo JR. Tetramethylammonium Fluoride Tetrahydrate for SNAr Fluorination of 4-Chlorothiazoles at a Production Scale. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.1c00042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mai Khanh Hawk
- Small Molecule Design and Development (SMDD), Lilly Technology Center North, Eli Lilly and Company, 1400 W Raymond Street, Indianapolis, Indiana 46221, United States
| | - Sarah J. Ryan
- Small Molecule Design and Development (SMDD), Lilly Technology Center North, Eli Lilly and Company, 1400 W Raymond Street, Indianapolis, Indiana 46221, United States
| | - Xin Zhang
- STA Pharmaceutical (WuXi STA), A Subsidiary of WuXi AppTec., No. 7 Building, #90 Delin Rd, WaiGaoQiao Free Trade
Zone, Shanghai 200131, People’s Republic of China
| | - Ping Huang
- STA Pharmaceutical (WuXi STA), A Subsidiary of WuXi AppTec., No. 7 Building, #90 Delin Rd, WaiGaoQiao Free Trade
Zone, Shanghai 200131, People’s Republic of China
| | - Jing Chen
- STA Pharmaceutical (WuXi STA), A Subsidiary of WuXi AppTec., No. 7 Building, #90 Delin Rd, WaiGaoQiao Free Trade
Zone, Shanghai 200131, People’s Republic of China
| | - Chuanren Liu
- STA Pharmaceutical (WuXi STA), A Subsidiary of WuXi AppTec., No. 7 Building, #90 Delin Rd, WaiGaoQiao Free Trade
Zone, Shanghai 200131, People’s Republic of China
| | - Jianping Chen
- STA Pharmaceutical (WuXi STA), A Subsidiary of WuXi AppTec., No. 7 Building, #90 Delin Rd, WaiGaoQiao Free Trade
Zone, Shanghai 200131, People’s Republic of China
| | | | - John Burnett
- Eli Lilly and Company Limited, Erl Wood Manor, Windlesham, Surrey GU20 6PH, U.K
| | - Craig White
- Eli Lilly and Company Limited, Erl Wood Manor, Windlesham, Surrey GU20 6PH, U.K
| | - Yu Lu
- Small Molecule Design and Development (SMDD), Lilly Technology Center North, Eli Lilly and Company, 1400 W Raymond Street, Indianapolis, Indiana 46221, United States
| | - John R. Rizzo
- Small Molecule Design and Development (SMDD), Lilly Technology Center North, Eli Lilly and Company, 1400 W Raymond Street, Indianapolis, Indiana 46221, United States
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6
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Zheng Y, Xie ZZ, He XC, Chen YS, Cheng WS, Chen K, Xiang HY, Chen XQ, Yang H. Phosphonium Ylide-Mediated Programmable Fluorination to Access Mono- and Difluoromethylarenes. Org Lett 2021; 23:2538-2542. [DOI: 10.1021/acs.orglett.1c00457] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu Zheng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Zhen-Zhen Xie
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Xian-Chen He
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Yan-Shan Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Wen-Shuo Cheng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Xiao-Qing Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
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7
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Gaur A, Avula NVS, Balasubramanian S. Insights into the Stabilization of Fluoride Ions in Ionic Liquids: Pointers to Better Fluorinating Agents. J Phys Chem B 2020; 124:8844-8856. [PMID: 32930587 DOI: 10.1021/acs.jpcb.0c04939] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The fluorination efficiency of a fluorinating agent depends on the free availability of the fluoride ions, which in turn depends on its interaction with its solvation shell. A stable fluoride-based poor solvate ionic liquid (SIL) comprising 1-ethyl-3-methylimidazolium (EMIM) cation and ethylene glycol (EG) was recently reported and demonstrated as a fluorinating agent. Herein, we performed ab initio calculations and ab initio molecular dynamics simulations to gain a microscopic understanding of the intermolecular interactions in this SIL in gas, liquid, and crystalline phases. Ethylene glycol (EG), being capable of forming hydrogen bond(s) with the fluoride ion, prevents the latter from reacting with the EMIM cation. Fluoride forms hydrogen bonds with both the cation and the EG molecule, but it was found to have more affinity toward EG, forming a stronger hydrogen bond with its hydroxyl proton than with the acidic proton of the cation. An optimal concentration of EG in the SIL balances its contribution to stabilizing the fluoride ion and yet making fluoride available for fluorination.
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Affiliation(s)
- Anjali Gaur
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Nikhil V S Avula
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
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8
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Pröhm P, Schmid JR, Sonnenberg K, Voßnacker P, Steinhauer S, Schattenberg CJ, Müller R, Kaupp M, Riedel S. Improved Access to Organo-Soluble Di- and Tetrafluoridochlorate(I)/(III) Salts. Angew Chem Int Ed Engl 2020; 59:16002-16006. [PMID: 32459871 PMCID: PMC7540313 DOI: 10.1002/anie.202006268] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/18/2020] [Indexed: 12/30/2022]
Abstract
A facile one-pot gram-scale synthesis of tetraalkylammonium tetrafluoridochlorate(III) [cat][ClF4 ] ([cat]=[NEt3 Me]+ , [NEt4 ]+ ) is described. An acetonitrile solution of the corresponding alkylammonium chloride salt is fluorinated with diluted fluorine at low temperatures. The reaction proceeds via the [ClF2 ]- anion which is structurally characterized for the first time. The potential application of [ClF4 ]- salts as fluorinating agents is evaluated by the reaction with diphenyl disulfide, Ph2 S2 , to pentafluorosulfanyl benzene, PhSF5 . The CN moieties in acetonitrile and [B(CN)4 ]- are transferred in CF3 groups. Exposure of carbon monoxide, CO, leads to the formation of carbonyl fluoride, COF2 , and elemental gold is dissolved under the formation of tetrafluoridoaurate [AuF4 ]- .
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Affiliation(s)
- P. Pröhm
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
| | - J. R. Schmid
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
| | - K. Sonnenberg
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
| | - P. Voßnacker
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
| | - S. Steinhauer
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
| | - C. J. Schattenberg
- Technische Universität BerlinDepartment of Chemistry: Theoretical ChemistrySekr. C7, Strasse des 17. Juni 13510623BerlinGermany
| | - R. Müller
- Technische Universität BerlinDepartment of Chemistry: Theoretical ChemistrySekr. C7, Strasse des 17. Juni 13510623BerlinGermany
| | - M. Kaupp
- Technische Universität BerlinDepartment of Chemistry: Theoretical ChemistrySekr. C7, Strasse des 17. Juni 13510623BerlinGermany
| | - S. Riedel
- Freie Universität BerlinInstitut of Chemistry and BiochemistryFabeckstr. 34/3614195BerlinGermany
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9
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Pröhm P, Schmid JR, Sonnenberg K, Voßnacker P, Steinhauer S, Schattenberg CJ, Müller R, Kaupp M, Riedel S. Verbesserter Zugang zu organisch löslichen Di‐ und Tetrafluoridochlorat(I/III)‐Salzen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006268] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- P. Pröhm
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
| | - J. R. Schmid
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
| | - K. Sonnenberg
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
| | - P. Voßnacker
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
| | - S. Steinhauer
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
| | - C. J. Schattenberg
- Technische Universität Berlin Institut für Chemie: Theoretische Chemie Sekr. C7, Straße des 17. Juni 135 10623 Berlin Deutschland
| | - R. Müller
- Technische Universität Berlin Institut für Chemie: Theoretische Chemie Sekr. C7, Straße des 17. Juni 135 10623 Berlin Deutschland
| | - M. Kaupp
- Technische Universität Berlin Institut für Chemie: Theoretische Chemie Sekr. C7, Straße des 17. Juni 135 10623 Berlin Deutschland
| | - S. Riedel
- Freie Universität Berlin Institut für Chemie und Biochemie Fabeckstr. 34/36 14195 Berlin Deutschland
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10
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Huang H, Zhong J, Tan X, Guo X, Yuan B, Lin Y, Francisco JS, Zeng XC. New Insights into the Stability of Anhydrous 2 H-Imidazolium Fluoride and its High Dissolution Capability toward a Strongly Hydrogen-Bonded Compound. J Am Chem Soc 2020; 142:10314-10318. [PMID: 32433880 DOI: 10.1021/jacs.0c04160] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Fluorides have been widely applied in pharmaceutical, medicinal, and materials science as well as in fine chemical manufacturing. The performance of fluorides, however, can be markedly affected by the water content. One previous study (Maiti, A.; et al. Phys. Chem. Chem. Phys. 2008, 10, 5050) suggested that anhydrous 1,3-dimethylimidazolium fluoride ([DMIm]F) was unstable since the fluoride undergoes a self-decomposition reaction. Herein we first show quantum-chemical calculation evidence that although gas-phase [DMIm]F is unstable, the bulk phase of anhydrous [DMIm]F is quite stable. We then demonstrate the successful synthesis of the anhydrous [DMIm]F compound via the reaction between 1,3-dimethylimidazolium iodide and silver fluoride. Importantly, we find that anhydrous [DMIm]F possesses a high dissolution capability toward 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), although it is known that TATB is hardly dissolved in many common organic solvents. Our Born-Oppenheimer molecular dynamics (BOMD) simulations further show that the high dissolving ability of anhydrous [DMIm]F toward TATB can be attributed to the chemical reaction between the F- anion and the TATB molecules, which disrupts the strong hydrogen-bonding interaction among the TATB molecules. Alternatively, water molecules in hydrous [DMIm]F tend to form a hydration layer around the F- anion, thereby preventing F- from reacting with the TATB molecule. This result explains why TATB is barely dissolved in hydrous [DMIm]F.
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Affiliation(s)
- Huisheng Huang
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Jie Zhong
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6316, United States
| | - Xiaoping Tan
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Xiaogang Guo
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Binfang Yuan
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Yinhe Lin
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Joseph S Francisco
- Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6316, United States
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
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11
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Reaction evolution of a solvate fluoride ionic liquid induced fluorination process probed by Raman spectroscopy. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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Tonouchi Y, Matsumoto K, Nagata T, Katahira M, Hagiwara R. Fluoride Ion Interactions in Alkali-Metal Fluoride–Diol Complexes. Inorg Chem 2020; 59:6631-6639. [DOI: 10.1021/acs.inorgchem.0c00783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yuto Tonouchi
- Graduate School of Energy Science, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuhiko Matsumoto
- Graduate School of Energy Science, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takashi Nagata
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Masato Katahira
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Rika Hagiwara
- Graduate School of Energy Science, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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13
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Karton-Lifshin N, Katalan S, Columbus I, Chen R, Yehezkel L, Madmon M, Dagan S, Elias S, Fridkin G, Zafrani Y. Effective neutralization of chemical warfare agents (HD, VX) by Me-DABCOF: a small molecule with dual action. Chem Commun (Camb) 2019; 55:12471-12474. [PMID: 31566634 DOI: 10.1039/c9cc07011g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Me-DABCOF, a mild universal, non-corrosive, water-soluble decontamination agent that effectively neutralizes chemical warfare agents (HD, VX).
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Affiliation(s)
- Naama Karton-Lifshin
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Shahaf Katalan
- Pharmacology
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Ishay Columbus
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Ravit Chen
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Lea Yehezkel
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Moran Madmon
- Analytical Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Shai Dagan
- Analytical Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Shlomi Elias
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Gil Fridkin
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
| | - Yossi Zafrani
- Departments of Organic Chemistry
- Israel Institute for Biological Research
- Ness-Ziona 74000
- Israel
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14
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Chen Z, Tonouchi Y, Matsumoto K, Saimura M, Atkin R, Nagata T, Katahira M, Hagiwara R. Partially Naked Fluoride in Solvate Ionic Liquids. J Phys Chem Lett 2018; 9:6662-6667. [PMID: 30398357 DOI: 10.1021/acs.jpclett.8b03117] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Truly naked fluoride exists only in the gas phase. Fluoride can be stabilized by a complexing agent and an organic cation, resulting in anhydrous or dehydrated fluoride which is "partially naked." This partially naked fluoride enables fluorination reactions at much lower temperatures than hydrated fluorides. Here we show a simple method for preparing fluoride-based solvate ionic liquids (SILs) by mixing 1-alkyl-3-methylimidazolium (1-ethyl-3-methylimidazolium or 1-butyl-3-methylimidazolium) bromide, silver fluoride (AgF), and EG (1:1:1 in molar ratio) in dry methanol. Removal of the methanol produced anhydrous SILs, [C2C1im]F·EG and [C4C1im]F·EG. This is the first SIL reported that comprises fluoride. 1H NMR and infrared spectroscopy reveal fluoride hydrogen bonds with EG OH groups and cation aromatic H atoms but not cation tail group protons. Fluorination reactions on benzyl bromide show that [C2C1im]F·EG has high reactivity with reasonable yield under mild conditions, confirming the fluoride ion is partially naked.
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Affiliation(s)
- Zhengfei Chen
- Department of Fundamental Energy Science, Graduate School of Energy Science , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yuto Tonouchi
- Department of Fundamental Energy Science, Graduate School of Energy Science , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Kazuhiko Matsumoto
- Department of Fundamental Energy Science, Graduate School of Energy Science , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Masayuki Saimura
- Institute of Advanced Energy , Kyoto University , Gokasho, Uji, Kyoto 611-0011 , Japan
| | - Rob Atkin
- School of Molecular Sciences , The University of Western Australia , 35 Stirling Highway , Perth , WA 6009 , Australia
| | - Takashi Nagata
- Institute of Advanced Energy , Kyoto University , Gokasho, Uji, Kyoto 611-0011 , Japan
| | - Masato Katahira
- Institute of Advanced Energy , Kyoto University , Gokasho, Uji, Kyoto 611-0011 , Japan
| | - Rika Hagiwara
- Department of Fundamental Energy Science, Graduate School of Energy Science , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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15
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Johansen MB, Lindhardt AT. Nucleophilic fluorination facilitated by a CsF–CaF2 packed bed reactor in continuous flow. Chem Commun (Camb) 2018; 54:825-828. [DOI: 10.1039/c7cc09035h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple to prepare, dry and handle packed bed reactor carrying CsF on CaF2, towards nucleophilic fluorinations in continuous flow, is reported.
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Affiliation(s)
- M. B. Johansen
- Department of Engineering
- Center for Carbon Dioxide Activation (CADIAC)
- Interdisciplinary Nanoscience Centre (iNANO)
- Aarhus University
- DK-8200 Aarhus N
| | - A. T. Lindhardt
- Department of Engineering
- Center for Carbon Dioxide Activation (CADIAC)
- Interdisciplinary Nanoscience Centre (iNANO)
- Aarhus University
- DK-8200 Aarhus N
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16
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Pliego JR. Potassium fluoride activation for the nucleophilic fluorination reaction using 18-crown-6, [2.2.2]-cryptand, pentaethylene glycol and comparison with the new hydro-crown scaffold: a theoretical analysis. Org Biomol Chem 2018; 16:3127-3137. [DOI: 10.1039/c8ob00418h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ion-pair binding in the hydro-crown ether leads to more effective catalytic cycle for nucleophilic fluorination.
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Affiliation(s)
- Josefredo R. Pliego
- Departamento de Ciências Naturais
- Universidade Federal de São João del-Rei
- São João del-Rei
- Brazil
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17
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Li Q, Lu F, Zhou G, Yu K, Lu B, Xiao Y, Dai F, Wu D, Lan G. Silver Inlaid with Gold Nanoparticle/Chitosan Wound Dressing Enhances Antibacterial Activity and Porosity, and Promotes Wound Healing. Biomacromolecules 2017; 18:3766-3775. [DOI: 10.1021/acs.biomac.7b01180] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Qing Li
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
| | - Fei Lu
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
- Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile, Chongqing 400715, China
| | - Guofang Zhou
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
| | - Kun Yu
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
| | - Bitao Lu
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
| | - Yang Xiao
- Sericulture and Agri-Food Research Institute of Guangdong Academy of Agriculture Science, Guangzhou 510610, China
| | - Fangying Dai
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
- Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile, Chongqing 400715, China
| | - Dayang Wu
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
- Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile, Chongqing 400715, China
| | - Guangqian Lan
- College
of Textile and Garments, Southwest University, Chongqing 400715, China
- Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile, Chongqing 400715, China
| |
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