Divinylarene Dioxide Synthesis via Lewis Base Catalyst
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Solution Overview
Problem
Existing processes for preparing divinylarene dioxides, such as divinylbenzene dioxide, suffer from low yields and co-production of undesirable by-products like acetamide or acetic acid when using hydrogen peroxide, making them inefficient and economically unviable.
Innovation Solution
A process involving the reaction of divinylarene with hydrogen peroxide in the presence of a catalyst and an organic modifier, specifically a Lewis base, to produce divinylarene dioxide with yields greater than 30% while minimizing by-products, using a catalyst like methyltrioxorhenium and an organic modifier like 3-methyl pyrazole, and reducing the organic modifier concentration to 5 weight percent or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen peroxide is used as the oxidizing agent in the presence of conventional catalysts and additives, then the divinylarene dioxide can be produced, but the yield is low (less than 30%) due to product instability and catalyst deactivation
Solution Approach 1:
A Lewis base organic modifier is introduced as an intermediary substance that mediates between the catalyst and hydrogen peroxide. The organic modifier forms a complex with the Lewis acid catalyst, modulating its activity to prevent catalyst deactivation while maintaining product stability, thereby achieving yields greater than 30%
Solution Approach 2:
The invention changes the chemical environment parameters by introducing the organic modifier at specific concentrations (0.01-5.0 moles per mole of divinylarene). This parameter change transforms the reaction system from one that produces unstable products and deactivates catalysts to one that maintains both stability and activity throughout the reaction
2Productivity
If conventional processes are used to prepare divinylarene dioxide, then the reaction can proceed, but undesirable by-products such as acetamide or acetic acid are co-produced
Solution Approach 1:
The invention converts the potentially harmful interaction between hydrogen peroxide and conventional catalysts (which produces undesirable by-products) into a beneficial selective oxidation process. By using a Lewis base-modified catalyst system, the reaction selectively produces divinylarene dioxide without co-producing acetamide or acetic acid by-products
3Productivity
If the organic modifier concentration is high in the reaction product, then the divinylarene dioxide yield is improved, but the product purity and stability are reduced
Solution Approach 1:
The invention optimizes the organic modifier concentration parameter to a specific range (0.01-5.0 moles per mole of divinylarene) that simultaneously achieves high yield (>30%) and acceptable product purity. This parameter optimization eliminates the need for extensive post-reaction purification while maintaining product quality
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 achieves high yields of divinylarene dioxides with minimal by-product formation, enhancing the economic and efficiency aspects of the production, and results in a product with improved thermal stability and low viscosity, suitable for various applications like coatings and composites.
Implementation Method 1
reacting a divinylarene with hydrogen peroxide as the oxidizing agent in the presence of a catalyst and an organic modifier to form a divinylarene dioxide
Implementation Method 2
in the presence of a catalyst and an organic modifier to form a divinylarene dioxide
Data Source
AI summary
A process for preparing a divinylarene dioxide comprising reacting a divinylarene, such as divinylbenzene, with hydrogen peroxide in the presence of a solvent and in the presence of a catalyst to from a divinylarene dioxide; wherein the hydrogen peroxide is present in the reaction mixture in an excess or an equivalent mole ratio per mole of divinylarene.