Sulfone Derivative Synthesis via Catalytic Oxidation
Solution Overview
Problem
Current processes for producing sulfone derivatives, such as pyroxasulfone, face challenges including the use of expensive oxidizing agents like m-chloroperoxybenzoic acid, potential contamination with sulfoxide derivatives, and inefficient reaction rates, which hinder industrial scalability and product purity.
Innovation Solution
A process involving the reaction of a sulfide derivative with an oxidizing agent in the presence of a metal catalyst and a carboxylic acid, performed at elevated temperatures, to efficiently produce sulfone derivatives with minimal sulfoxide by-products, thereby improving yield and industrial viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If m-chloroperoxybenzoic acid (mCPBA) is used as oxidizing agent, then oxidation reaction proceeds, but production cost increases and handling becomes difficult
Solution Approach 1:
The patent replaces expensive mCPBA with hydrogen peroxide, a cheaper and more environmentally friendly oxidizing agent. This substitution reduces production costs and simplifies handling while maintaining oxidation effectiveness, directly addressing the technical contradiction between reaction reliability and manufacturing ease
Solution Approach 2:
The patent introduces specific reaction parameters including temperature control (40-80°C), catalyst selection (metal salts like iron, copper, or manganese), and pH control (3-7) to optimize the oxidation process using hydrogen peroxide. These parameter changes enable the use of a cheaper oxidizing agent while maintaining effective oxidation reaction
2Productivity
If oxidation reaction is performed to produce sulfone derivative, then sulfone product is formed, but sulfoxide by-product remains in product
Solution Approach 1:
The patent employs a two-stage oxidation process where the first stage produces sulfoxide and the second stage converts sulfoxide to sulfone. By controlling reaction conditions and monitoring intermediate formation, the process ensures complete oxidation to the desired sulfone product while minimizing sulfoxide by-product contamination
Solution Approach 2:
The patent uses a two-stage continuous oxidation process where the first oxidation stage converts sulfide to sulfoxide, and the second stage converts sulfoxide to sulfone. This continuous action ensures complete conversion to the desired sulfone product while minimizing intermediate by-product accumulation
Solution Approach 3:
The patent performs a first oxidation stage that deliberately produces sulfoxide as an intermediate, then follows with a second oxidation stage to convert the sulfoxide to the final sulfone product. This preliminary action of forming the intermediate is followed by its complete conversion, ensuring high product purity
3Reliability
If oxidation reaction proceeds slowly, then selectivity is maintained, but production efficiency decreases
Solution Approach 1:
The patent introduces metal catalysts (iron, copper, or manganese salts) as intermediaries to accelerate the oxidation reaction. These catalysts speed up both oxidation stages while maintaining selectivity by facilitating controlled electron transfer, resolving the contradiction between reaction rate and selectivity
Solution Approach 2:
The patent optimizes reaction parameters including temperature (40-80°C), pH (3-7), and catalyst concentration to achieve optimal reaction rate while maintaining selectivity. These parameter changes enable faster reaction without sacrificing the controlled oxidation to the desired sulfone product
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 process effectively reduces the presence of sulfoxide contaminants, enhancing the quality and yield of sulfone derivatives, making them suitable for industrial herbicide production.
Implementation Method 1
reacting a compound of the formula (1) with an oxidizing agent in the presence of a metal catalyst
Implementation Method 2
oxidizing a sulfide derivative, i.e., a compound of the following formula (1)
Data Source
AI summary
The present invention provides an industrially preferred method for producing a sulfone derivative that is useful as an herbicide. This process is for producing a compound of the formula (2). In the method, a compound of the formula (1) is reacted with an oxidizer in the presence of a metal catalyst and the presence of a carboxylic acid to produce the compound of the formula (2).