Silicon-Based Cross-Coupling Agents for Selective Bond Formation
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Solution Overview
Problem
Current cross-coupling reactions for forming carbon-carbon and carbon-nitrogen bonds face issues with the formation of unwanted homo-coupled products and the use of toxic metals, necessitating the development of new methods that avoid these drawbacks.
Innovation Solution
The use of silicon-based cross-coupling agents, specifically compounds of formula I, in conjunction with a catalyst system and an ethereal solvent, to facilitate cross-coupling reactions between organo-lithium compounds and organic halides, thereby forming new carbon-carbon and carbon-nitrogen bonds efficiently while minimizing homo-coupled products and toxic metal usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cross-coupling reactions are used to form carbon-carbon and carbon-nitrogen bonds, then bond formation is achieved, but unwanted homo-coupled products are formed and toxic metals are used
Solution Approach 1:
The patent introduces silicon-based cross-coupling agents as intermediary compounds that facilitate the coupling reaction between organic halides and nucleophiles without forming unwanted homo-coupled products. The silicon agent acts as a mediator that transfers the organic group selectively, preventing direct coupling of halide molecules that would produce homo-coupled byproducts.
Solution Approach 2:
The patent changes the chemical parameters of the cross-coupling reaction by replacing traditional metal-based reagents with silicon-based compounds. This parameter change in the reagent type fundamentally alters the reaction pathway, eliminating the formation of homo-coupled products while maintaining the desired cross-coupling efficiency.
2Manufacturing precision
If conventional cross-coupling reactions are used, then carbon-carbon and carbon-nitrogen bonds are formed, but toxic metals are required
Solution Approach 1:
The patent extracts and removes toxic metal components from the cross-coupling reaction system by replacing them with silicon-based cross-coupling agents. This extraction of harmful elements maintains the core functionality of bond formation while eliminating the toxic metal dependency inherent in conventional methods.
Solution Approach 2:
The silicon-based cross-coupling agents serve as disposable reagents that perform the coupling function and are then discarded, replacing the need for toxic metal catalysts or reagents. These silicon agents are used in stoichiometric amounts and do not require recovery or disposal of toxic metal waste.
3Productivity
If conventional cross-coupling methods are used, then reactions proceed, but yields and product purity are reduced due to homo-coupled byproducts
Solution Approach 1:
The silicon-based cross-coupling agent acts as an intermediary that enables high-yield reactions while producing clean products without homo-coupled byproducts. The mediator facilitates complete conversion of reactants to desired products, improving both yield and purity simultaneously.
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 the formation of homo-coupled products and eliminates the need for toxic metals, enhancing the efficiency and selectivity of cross-coupling reactions, allowing for the formation of desired carbon-carbon and carbon-nitrogen bonds with improved yields and product purity.
Implementation Method 1
contacting the compound of formula NuLi with the compound of formula E-X in the presence of a catalyst system
Data Source
AI summary
Compositions and methods using silicon-based cross-coupling agents in the formation of carbon-carbon and carbon-nitrogen bonds are described.