Hexafluoro-2-methoxypropane Synthesis via CsF Fluorination
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Solution Overview
Problem
Current processes for producing 1,1,1,3,3,3-hexafluoro-2-methoxypropane, a precursor for the anesthetic Sevoflurane, face challenges such as high temperature requirements, hazardous reagents, low yields, and complex purification steps, making them unsuitable for industrial-scale production.
Innovation Solution
A process involving the reaction of a novel carboxylic acid or its salt with a methylating agent, followed by hydrolysis and decarboxylation, and subsequent reaction with a fluorinating agent to produce 1,1,1,3,3,3-hexafluoro-2-methoxypropane, utilizing a hydroxycarboxylic ester as a starting material and optimizing conditions for high yield and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chloromethyl ether is fluorinated with KF, then Sevoflurane is produced, but the reaction requires high temperature and prolonged time
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing KF with CsF as the fluorinating agent. This parameter change enables the reaction to proceed at lower temperatures and faster rates, directly resolving the contradiction between productivity and temperature requirements.
2Productivity
If the methyl ether is reacted with BrF3, then Sevoflurane is produced, but handling of dangerous BrF3 is required
Solution Approach 1:
The patent replaces the dangerous but effective BrF3 with CsF, which is safer to handle. While CsF may require different reaction conditions, it eliminates the handling hazards of BrF3, resolving the contradiction between productivity and safety.
Solution Approach 2:
The patent introduces CsF as an intermediary fluorinating agent that provides the necessary fluorination capability without the harmful properties of BrF3. This intermediary substance maintains reaction efficiency while eliminating safety hazards.
3Quantity of substance
If HFIP is reacted with hydrogen fluoride and formaldehyde, then Sevoflurane is produced, but yield is low due to polyether by-product formation
Solution Approach 1:
The patent extracts or removes the problematic formaldehyde step from the reaction pathway by using CsF as a fluorinating agent on pre-synthesized intermediates. This eliminates the side reaction that produces polyether by-products, thereby increasing Sevoflurane yield.
4Ease of manufacture
If hexafluoropropylene oxide is rearranged to produce hexafluoroacetone, then HFIP can be produced, but the starting material is expensive
Solution Approach 1:
Instead of producing HFIP through the conventional route of hexafluoropropylene oxide rearrangement to hexafluoroacetone, the patent inverts the approach by using CsF to fluorinate other precursors directly, bypassing the expensive hexafluoropropylene oxide starting material.
5Ease of manufacture
If hexachloroacetone is fluorinated with hydrogen fluoride to produce hexafluoroacetone, then HFIP can be produced, but purification processes are complicated
Solution Approach 1:
The patent extracts or removes the problematic purification steps by using CsF as the fluorinating agent. This reagent provides cleaner reactions with fewer by-products requiring separation, thereby simplifying the overall production process while maintaining ease of manufacture.
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 enables efficient and cost-effective production of 1,1,1,3,3,3-hexafluoro-2-methoxypropane, improving yield and reducing the complexity of existing processes, thereby facilitating its use as a raw material for Sevoflurane production.
Implementation Method 1
a process for producing 1,1,3,3,3-pentafluoro-2-methoxypropene from a carboxylic acid compound, in particular a process for producing 1,1,3,3,3-pentafluoro-2-methoxypropene represented by chemical formula (4): CF2＝C(CF3)(OCH3) which comprises reacting a salt of a carboxylic acid represented by chemical formula (3): (CF3)2C(OCH3)COOM with a fluorinating agent
Implementation Method 2
reacting a salt of a carboxylic acid represented by chemical formula (3): (CF3)2C(OCH3)COOM with a fluorinating agent
Data Source
AI summary
The present invention provides a process for producing 1,1,1,3,3,3-hexafluoro-2-methoxypropane, wherein an olefin compound represented by chemical formula (4): CF2=C(CF3)(OCH3) is reacted with a fluorinating agent.