Fluorine-Containing Sulfide Synthesis via Metal Catalyst Halogen Exchange
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Solution Overview
Problem
Current methods for producing fluorine-containing sulfide compounds are hindered by the toxicity and high cost of reagents, as well as inefficiencies in halogen exchange reactions, making industrial-scale production challenging.
Innovation Solution
A method involving the reaction of a chlorine-containing sulfide compound with a fluorinating agent in the presence of a metal catalyst, supported on activated charcoal, at temperatures between 50 to 350°C, to selectively replace chlorine atoms with fluorine atoms, thereby producing fluorine-containing sulfide compounds efficiently and cost-effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reagents (thiophosgen, thiols) are used to synthesize fluorine-containing sulfide compounds, then the synthesis can be achieved, but the reagents have strong toxicity and extreme odor
Solution Approach 1:
The patent replaces expensive, toxic conventional reagents (thiophosgen, thiols) with a more benign fluorinating agent system that can be disposed of more easily. The use of metal fluoride with chlorine-containing sulfide compounds eliminates the need for handling highly toxic reagents, making the process safer and more environmentally friendly while maintaining synthesis capability.
Solution Approach 2:
The patent introduces metal fluoride as an intermediary substance that facilitates the fluorination reaction without requiring toxic reagents. The metal fluoride acts as a fluorine source that reacts with chlorine-containing sulfide compounds to produce fluorine-containing sulfide compounds, serving as a safe mediator that eliminates direct contact with harmful substances.
2Reliability
If expensive reagents are used to introduce the trifluoromethylthio group, then the desired product can be obtained, but the cost becomes prohibitive for industrial production
Solution Approach 1:
The patent replaces expensive specialized reagents for introducing the trifluoromethylthio group with inexpensive metal fluoride and readily available chlorine-containing sulfide compounds. This substitution dramatically reduces material costs while maintaining the ability to produce high-quality fluorine-containing sulfide compounds suitable for industrial manufacturing.
Solution Approach 2:
The patent changes the reaction parameters by using metal fluoride instead of expensive organic fluorinating agents. This parameter change in the fluorine source, combined with optimizing reaction conditions (temperature, catalyst), enables cost-effective production while preserving product quality and introducing the desired trifluoromethylthio or pentafluoroethylthio groups.
3Reliability
If conventional halogen exchange methods are used, then fluorine-containing sulfide compounds can be produced, but the process requires excessive amounts of fluorinating agent and multiple manufacturing steps
Solution Approach 1:
The patent extracts and eliminates unnecessary manufacturing steps from conventional halogen exchange methods. By using metal fluoride directly with chlorine-containing sulfide compounds, the process removes the need for preparing fluorinating agents in advance and eliminates intermediate steps, resulting in a streamlined single-step reaction that produces fluorine-containing sulfide compounds efficiently.
Solution Approach 2:
The patent achieves continuous useful action by using metal fluoride as a stable, readily available reagent that reacts directly with chlorine-containing sulfide compounds in a single continuous process. This eliminates the need for batch preparation of fluorinating agents and multiple sequential steps, enabling continuous production with minimal interruption and reduced manufacturing complexity.
4Reliability
If metal fluoride is used for halogen exchange reaction, then fluorine-containing sulfide compounds can be produced, but the reactivity varies with particle size and water content making industrial use difficult
Solution Approach 1:
The patent addresses the variability in metal fluoride reactivity by optimizing and controlling key parameters such as particle size and water content. By establishing specific parameter ranges and control methods for metal fluoride, the process achieves consistent reactivity and predictable reaction outcomes, making industrial-scale operation reliable and controllable despite the inherent sensitivity of metal fluoride properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the simple, low-cost, and selective production of fluorine-containing sulfide compounds, enhancing industrial feasibility and product purity.
Implementation Method 1
reacting a chlorine-containing sulfide compound represented by formula (1) and a fluorinating agent in the presence of a metal catalyst
Implementation Method 2
a metal catalyst, supported on activated charcoal
Data Source
AI summary
The present invention aims to provide a method by which fluorine-containing sulfide compounds, particularly sulfide compounds that contain hydrogen and fluorine, can be produced in a simple, low-cost and industrial manner. Provided is a method of producing a fluorine-containing sulfide compound represented by the following formula (2):(F)n-A3-S-A4-(F)m (2)(wherein A3 and A4 are independently an optionally substituted hydrocarbyl group with a carbon number of 1 to 3; n and m represent the numbers of fluorine atoms binding to A3 and A4, with n+m=1 to 13 being satisfied), comprising reacting a chlorine-containing sulfide compound represented by the following formula (1):(Cl)n-A1-S-A2-(Cl)m (1)(wherein A1 and A2 are independently an optionally substituted hydrocarbyl group with a carbon number of 1 to 3; n and m represent the numbers of chlorine atoms binding to A1 and A2, with n+m=1 to 13 being satisfied) and a fluorinating agent.