Fluensulfone Sulfone Oxidation with Biphasic Tungsten Oxide Catalysis
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Solution Overview
Problem
Existing methods for synthesizing fluensulfone, a nematicide, face challenges such as low yields, formation of undesired by-products, and environmental impact due to the use of hydrogen peroxide as an oxidant, particularly when converting the sulfide to the sulfone form.
Innovation Solution
The method employs an aqueous biphasic reaction medium using hydrogen peroxide as an oxidant in the presence of metal oxide-based catalysts, specifically tungsten oxide, to selectively oxidize 5-chloro-2-((3,4,4-trifluorobut-3-en-1-yl)thio)-1λ3,3λ2-thiazole to the corresponding sulfone, minimizing the formation of side products and enabling catalyst recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If H2O2 is used as oxidant in conventional methods, then the oxidation reaction proceeds, but low yield and formation of undesired by-products occur due to non-selective oxidation
Solution Approach 1:
A metal oxide catalyst is introduced as an intermediary substance to mediate the oxidation reaction between H2O2 and the sulfide substrate. The catalyst provides a specific reaction pathway that selectively oxidizes the sulfide to sulfone while preventing non-selective oxidation of the fluorinated double bond, thereby resolving the contradiction between reaction progress and selectivity.
Solution Approach 2:
The reaction conditions are optimized by adjusting parameters such as catalyst loading, H2O2 concentration, temperature, and solvent composition. These parameter changes enable the reaction to proceed with high selectivity for sulfone formation while suppressing side reactions, thus improving both yield and manufacturing precision.
2Productivity
If higher temperatures and longer reaction times are used to improve sulfoxide to sulfone conversion, then oxidation completeness increases, but side reactions and by-product formation increase
Solution Approach 1:
The metal oxide catalyst acts as an intermediary that enables the oxidation reaction to proceed efficiently at lower temperatures and shorter reaction times. By providing an alternative reaction pathway with lower activation energy, the catalyst achieves complete conversion without requiring conditions that would promote harmful side reactions and by-product formation.
Solution Approach 2:
The potential harmful effect of extended reaction times and elevated temperatures (which cause side reactions) is converted into a benefit by using the catalyst to achieve the same conversion completeness under milder conditions. The catalyst transforms the need for harsh conditions into an opportunity for selective, clean oxidation.
3Productivity
If sulfone is formed using conventional H2O2 oxidation, then the desired product is obtained, but further oxidative cleavage of the fluorinated double bond occurs yielding undesired by-products
Solution Approach 1:
The metal oxide catalyst serves as a selective intermediary that facilitates sulfide oxidation to sulfone while being inert toward the fluorinated double bond. This selective catalysis prevents the oxidative cleavage side reaction that would otherwise occur with conventional H2O2 oxidation, allowing sulfone formation without harmful by-products.
Solution Approach 2:
The catalyst exhibits local quality by being highly active for sulfide oxidation while showing no activity toward the fluorinated double bond. This site-specific catalytic activity ensures that oxidation occurs only at the desired location (sulfide sulfur atom) while leaving the fluorinated alkene intact, preventing harmful side reactions.
4Productivity
If 2KHSO5·KHSO4·K2SO4 is used as oxidant, then improved yield is achieved, but environmentally deleterious sulfate salts are introduced and formed
Solution Approach 1:
The oxidant system is changed from 2KHSO5·KHSO4·K2SO4 to H2O2 with metal oxide catalyst. This parameter change in the oxidant type maintains high yield while eliminating the formation of environmentally harmful sulfate salts, as H2O2 decomposes to water and oxygen, providing an environmentally benign oxidation process.
Solution Approach 2:
The environmentally harmful sulfate salt by-products generated by 2KHSO5·KHSO4·K2SO4 oxidation are replaced by using H2O2, which decomposes into harmless water and oxygen. This substitution converts a harmful oxidation system into a benign one while maintaining high productivity through catalytic enhancement.
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 achieves high yields of fluensulfone with minimal side product formation and allows for catalyst reuse, addressing environmental concerns associated with traditional hydrogen peroxide-based methods.
Implementation Method 1
using metal oxide-based catalysts and an oxidant
Implementation Method 2
oxidation of 5-chloro-2-((3,4,4-trifluorobut-3-en-1-yl)thio)-1λ3,3λ2-thiazole and analogs thereof to the corresponding sulfone
Implementation Method 3
aqueous H2O2 as oxidizing agent/oxygen donor
Implementation Method 4
it is easy to separate the water phase containing the catalyst and the organic phase containing the desired product
Data Source
AI summary
This invention is directed to a method of oxidation of 5-chloro-2-((3,4,4-trifluorobut-3-en-1-yl)thio)-1λ3,3λ2-thiazole and analogs thereof to the corresponding sulfone, using an oxidant and a metal oxide-based catalyst.