Green Chemistry Milestone: Fluorine Complexes from Common Fluoride Salt
- Research
Researchers from Japan develop a safer method for the synthesis of fluoride complexes for electrochemical fluorination
Fluorinated compounds are used everywhere—from pharmaceuticals and agrochemicals to advanced materials in imaging techniques. One promising method for the synthesis of fluorinated compounds is using quaternary ammonium fluorides, but these fluorinating agents tend to absorb moisture (hygroscopic), which affects their reactivity. To overcome this challenge, researchers from Shibaura Institute of Technology, Japan, have synthesized a new fluorinating agent (R4NF(HFIP)3) using KF salt through ion-exchange reaction—with promising applications in electrochemical fluorination.
Title: Use of Potassium Fluoride to Synthesize a New Fluorinating Reagent
Caption: The reaction between KF and NBR in HFIP forms Bu4NF(HFIP)3 complex through ion exchange
Credit : Professor Toshiki Tajima from Shibaura Institute of Technology, Japan
License type : Original Content
Usage restrictions : Cannot be used without permission
Chemical synthesis lies at the heart of modern science and technology, enabling the creation of various pharmaceuticals, agrochemicals, and functional materials. While the demand for chemical synthesis grows with scientific advancements, it comes with the costs of environmental pollution and hazardous waste. To combat the same, researchers are now turning towards sustainable alternatives using green chemistry approaches.
One such chemical process which is in urgent need for greener alternatives is fluorination. Fluorine-based organic compounds find applications in a variety of industries, ranging from pharmaceuticals to electronics. These compounds are synthesized through the process of fluorination using different fluorinating agents like potassium fluoride (KF) and quaternary ammonium fluorides like tetrabutylammonium fluoride (Bu4NF). While these reagents are promising, their reactivity is often hindered due to low solubility (as in the case of KF) and high hygroscopicity (seen in Bu4NF). This calls for the development of novel fluorinating agents with suitable properties and better reactivity.
Against this backdrop, a team of researchers led by Professor Toshiki Tajima from Shibaura Institute of Technology, Japan, came up with an exciting solution. The team developed a new fluorinating quaternary ammonium complex by combining KF with tetrabutylammonium bromide (Bu4NBr). The newly formed quaternary ammonium tri(1,1,1,3,3,3-hexafluoroisopropanol)-coordinated fluoride (Bu4NF(HFIP)3) showed extremely low hygroscopicity and was found to be an excellent fluorinating reagent for electrochemical fluorination. The findings were made available online on April 29, 2025, and published in Volume 61, Issue 42 of Chemical Communications on May 25, 2025.
“KF is a safe, affordable fluorinating agent, but its poor solubility in organic solvents has limited its use. We had been exploring ways to make it 老挝磨丁赌场_老挝赌场-中国竞彩网官网推荐 effective,” explains Prof. Tajima. “It all clicked only after we discovered it readily dissolves in HFIP."
To develop the fluorinating complex, the team started by dissolving KF in HFIP and Bu4NBr in dichloromethane, respectively. Once dissolved, both solutions were mixed together for 30 minutes and were then subjected to filtration and purification. The resultant product was a viscous and clear liquid of Bu4NF(HFIP)3. The chemical composition of the product was confirmed through NMR spectroscopy studies. Further老挝磨丁赌场_老挝赌场-中国竞彩网官网推荐, the approach was also applied to other quaternary ammonium bromides for synthesis of different reagents.
The resultant products showed low hygroscopicity, which is favorable for a greater shelf life. Additionally, the synthesis only involved a basic ion exchange reaction using KF which makes the method simpler and inexpensive. Moreover, the method is also safer compared to other synthesis methods, making it a greener alternative for fluorination.
“The new fluorinating agent we developed in this study can have a range of applications in the synthesis of pharmaceuticals, agrochemicals, functional materials, molecular probes for PET inspection, and many 老挝磨丁赌场_老挝赌场-中国竞彩网官网推荐...” remarks Prof. Tajima.
Many industries use fluorinating agents for the synthesis of organofluorine compounds. Having a safer fluorinating reagent that is easier to handle could be a game-changer and is a significant milestone in the field of green chemistry. By overcoming the limitations of two different fluorinating reagents to form a novel fluorinating agent, the research has bridged a critical gap in the process of fluorination, opening avenues for sustainable and effective synthesis strategies.
Reference
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Title of original paper: |
Facile synthesis of R4NF(HFIP)3 complexes from KF and their application to electrochemical fluorination |
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Journal: |
Chemical Communications |
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DOI: |
Additional infotmation for EurekAlert
| Latest Article Publication Date: | May 25, 2025 |
| Method of Research: |
Experimental Study |
| Subject of Research: | Not Applicable |
| Conflicts of Interest Statement: | There are no conflicts to declare |
Authors
About Professor Toshiki Tajima from SIT, Japan
Dr. Toshiki Tajima is a Professor at the College of Engineering, Shibaura Institute of Technology, Japan. He earned his doctorate from the Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, and specializes in organic electrochemistry and synthesis. He has over 56 peer-reviewed publications and over 11 book chapters to his credit. His research mainly focuses on green chemistry, environmental chemistry, and sustainable sciences.
Funding Information
Not Available