Trihalodisilane Reduction Chemistry for Low By-Product Purification
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Solution Overview
Problem
Current methods for fabricating trihalodisilane often result in the generation of by-products such as dihalodisilane and tetrahalodisilane, which are difficult to separate from the target product, leading to reduced yield and purification challenges.
Innovation Solution
A method involving a mixed reducing agent comprising an aluminum hydride and a tin hydride is used to reduce halodisilane, allowing for the selective generation and separation of 1,1,1-trihalodisilane through controlled temperature and stirring processes, eliminating the need for additional solvents and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reduction methods using single reducing agents are used, then the reduction reaction can proceed, but by-products such as dihalodisilane and tetrahalodisilane are generated that are difficult to separate from the target product
Solution Approach 1:
The patent uses a mixed reducing agent system comprising both lithium aluminum hydride and dibutyltin hydride. This composite reducing agent system enables selective reduction to produce trihalodisilane while minimizing the formation of difficult-to-separate by-products, thereby improving product purity and facilitating easier purification.
Solution Approach 2:
The patent employs specific temperature control parameters during the reduction reaction. By maintaining the reaction temperature within a controlled range and performing cooling to below 15°C during certain stages, the reaction selectivity is improved, reducing by-product formation and enhancing the ease of separation between target product and by-products.
2Productivity
If high-temperature coupling reactions are used to fabricate trihalodisilane, then the reaction can proceed efficiently, but the separation of by-products becomes more difficult and yield is reduced
Solution Approach 1:
The patent utilizes temperature as a critical parameter to control the reduction reaction. By conducting the reaction at controlled temperatures and implementing cooling steps to below 15°C, the reaction produces trihalodisilane with high yield while simultaneously ensuring that by-products are formed in minimal amounts and are easily separable, thus simplifying the purification process.
Solution Approach 2:
The mixed reducing agent system of lithium aluminum hydride and dibutyltin hydride works synergistically to achieve high-yield production of trihalodisilane. This composite approach ensures that the reduction proceeds efficiently to produce the desired product while minimizing by-product formation, thereby improving both productivity and ease of manufacture through simplified purification.
3Ease of operation
If additional solvents are used in the reduction process, then the reaction can be facilitated, but the process complexity and cost increase
Solution Approach 1:
The patent employs the mixed reducing agent system that inherently facilitates the reduction reaction without requiring additional solvents. The reducing agents themselves provide the necessary reaction medium and functionality, eliminating the need for separate solvent systems and reducing overall process complexity while maintaining ease of operation.
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 effectively reduces by-product formation, enhances the yield of high-purity 1,1,1-trihalodisilane, and simplifies the purification process, resulting in improved productivity and economic efficiency.
Implementation Method 1
reducing the halodisilane, using a mixed reducing agent including a first reducing agent represented by following Chemical Formula 1-1 and a second reducing agent represented by following Chemical Formula 2-1
Implementation Method 2
cooling the halodisilane to a first temperature that is higher than a freezing point of the halodisilane and lower than 15° C.
Implementation Method 3
mixing the cooled halodisilane with a mixed reducing agent including an aluminum reducing agent and a tin reducing agent to generate a mixture; stirring the mixture at a second temperature that is higher than the first temperature
Data Source
AI summary
A method for fabricating trihalodisilane, the method includes providing a halodisilane including at least four halogen atoms; reducing the halodisilane, using a mixed reducing agent including a first reducing agent represented by following Chemical Formula 1-1, in which RA is an alkyl group, and m and n are each independently 1 or 2, and m+n=3, and a second reducing agent represented by following Chemical Formula 2-1, in which RS is an alkyl group or an aryl group, p and q are each independently 1, 2, or 3, and p+q=4; and obtaining a product including a 1,1,1-trihalodisilane,(RA)m—Al—Hn [Chemical Formula 1-1](RS)p—Sn—Hq. [Chemical Formula 2-1]