Polyfluoroallyl Ether Synthesis Using Boron Trichloride
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Solution Overview
Problem
The synthesis of polyfluoroallyl ethers often requires the use of boron trifluoride (BF3), which is hazardous and difficult to handle, posing safety and handling challenges.
Innovation Solution
The method involves replacing BF3 with boron trichloride (BCl3) and other boron compounds, which are easier to handle, less toxic, and less corrosive, to synthesize polyfluoroallyl ethers by reacting compounds like CF2═CF—CF2—OSO2Cl or CF2═CF—CF2—OSO2CF3 with hexafluoropropylene, eliminating the need for BF3.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If BF3 is used to synthesize polyfluoroallyl ethers, then the synthesis can be performed, but the reagent is hazardous and difficult to handle
Solution Approach 1:
The patent applies parameter changes by substituting BF3 with alternative boron compounds (BCl3, BBr3) that have different physical and chemical parameters. These alternatives maintain the necessary reactivity for synthesizing polyfluoroallyl ethers while possessing improved safety characteristics such as lower toxicity and easier handling properties
Solution Approach 2:
The patent employs disposable alternative reagents (BCl3, BBr3) that can be used once and discarded, eliminating the need for complex handling procedures required by BF3. These alternatives are less hazardous and do not require specialized equipment for safe handling, making the process simpler and safer
2Productivity
If BF3 is used in the synthesis process, then the reaction can proceed, but safety risks increase
Solution Approach 1:
The patent changes the chemical parameters by using alternative boron halides with different safety profiles. BCl3 and BBr3 provide similar catalytic activity for the synthesis reaction but with reduced safety risks, maintaining productivity while improving reliability
Solution Approach 2:
The patent uses alternative boron compounds as intermediary catalysts that facilitate the same chemical transformation as BF3 but with improved safety characteristics. These intermediaries perform the necessary function of promoting the reaction between hexafluoropropylene and other reagents without the hazardous properties of BF3
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 approach improves safety and efficiency in producing polyfluoroallyl ethers by using more manageable and safer reagents, such as BCl3, while maintaining high yields, as seen in the synthesis of CF2═CF—CF2—OSO2CF3 with a 75% yield improvement.
Implementation Method 1
combining second components comprising BCl3 and hexafluoropropylene to provide CF2═CF—CF2—OSO2Cl
Implementation Method 2
combining second components comprising M(OSO2CF3)3 and hexafluoropropylene at a temperature greater than 0° C. to provide CF2═CF—CF2—OSO2CF3
Implementation Method 3
polyfluoroallyl ethers are synthesized by substitution of the fluorosulfate group in CF2═CF—CF2—OSO2F (perfluoroallyl fluorosulfate or PFAFS) by alkoxides
Data Source
AI summary
A method includes combining first components including at least one of CF2═CF—CF2—OSO2Cl or CF2═CF—CF2—OSO2CF3, a polyfluorinated compound having at least one ketone or carboxylic acid halide, and fluoride ion to provide a compound comprising at least one perfluorinated allyl ether group. A method includes combining second components including B(OSO2Cl)3 and hexafluoropropylene to provide CF2═CF—CF2—OSO2Cl. Another method includes combining second components including M(OSO2CF3)3 and hexafluoropropylene at a temperature above 0° C. to provide CF2═CF—CF2—OSO2CF3, wherein M is Al or B. The compound CF2═CF—CF2—OSO2Cl is also provided.