Fluorinated Organic Iodine Insertion for High-Purity Copolymers
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Solution Overview
Problem
Existing methods for synthesizing fluorine-containing compounds and polymers with C—I bonds face challenges in controlling reactions, leading to impurities and the need for high temperatures or heavy metal catalysts, which are not suitable for electronics and life sciences applications.
Innovation Solution
An insertion reaction of an olefin into a fluorine-containing organic iodine compound using a specific ionic catalyst formed from a monovalent anion and counter cation, allowing for controlled, mild reactions to produce high-purity compounds and polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If azo compounds or peroxides are used as radical generators, then polymer with terminal iodine is generated, but byproducts with terminal groups from radical generating agents are also generated and reaction control becomes difficult
Solution Approach 1:
The patent uses an organic iodine compound as an intermediary substance that serves dual purposes: as a chain transfer agent to introduce terminal iodine groups, and as a radical generator alternative to conventional azo compounds or peroxides. This intermediary approach eliminates the formation of unwanted terminal groups from radical generators while maintaining effective radical polymerization, thereby producing high-purity polymer without byproducts containing radical generator residues.
2Productivity
If high temperatures are used to generate radicals by independent homolysis, then polymerization proceeds, but reaction control becomes difficult and unwanted side reactions may occur
Solution Approach 1:
The patent changes the key parameter of radical generation from thermal homolysis requiring high temperatures to photoinitiated radical generation using visible light. This parameter change allows the reaction to proceed at ambient or mild temperatures while maintaining effective polymerization rates, thereby improving reaction control and preventing unwanted side reactions that occur at high temperatures.
3Temperature
If copper catalyst and copper iodide co-catalyst are used for low temperature synthesis, then polyfluoroolefin with terminal iodine is produced, but heavy metal contamination occurs
Solution Approach 1:
The patent extracts and removes the copper catalyst system from the reaction, replacing it with a copper-free photoinitiated radical generation method using visible light and organic iodine compounds. This extraction of the heavy metal component eliminates copper contamination while maintaining the ability to conduct low-temperature polymerization, making the process suitable for electronics and life sciences applications where heavy metal residues are unacceptable.
4Adaptability or versatility
If conventional radical polymerization is used, then monomer versatility is excellent and polymerization can be carried out easily in polar media, but terminal end control and purity are compromised
Solution Approach 1:
The patent employs an organic iodine compound as an intermediary that enables precise terminal end control while preserving the versatility of conventional radical polymerization. The organic iodine compound functions as both chain transfer agent and controlled radical source, allowing polymerization to proceed in diverse media including polar solvents with various monomers, while ensuring all polymer chains terminate with the desired iodine group for high purity and controlled architecture.
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
The method enables the production of desired fluorine-containing compounds and polymers with narrow molecular weight distribution and controlled molecular weight, avoiding impurities and heavy metals, suitable for electronics and life sciences.
Implementation Method 1
an insertion reaction of a compound (20) represented by formula (20) into a compound (10) having a partial structure represented by formula (1) in the presence of an ionic catalyst
Data Source
AI summary
A method of producing a fluorine-containing compound is a method of producing a compound (30) having partial structure (3) by an insertion reaction of compound (20) into compound (10) that has partial structure (1), in the presence of an ionic catalyst formed from a specific monovalent anion and a counter cation. In the formulas, * represents a bonding site, and X1 and R1 to R4 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, or an organic group having a carbon number of 1 to 20 which may have a substituent.