Ru(0) Catalyst Particles for Stable, Selective Dehydrogenative Silylation
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Solution Overview
Problem
Existing dehydrogenative silylation catalysts are prone to instability due to sensitivity to oxygen, water, and light, leading to unselective reactions and low yields, limiting their practical application.
Innovation Solution
A method of preparing catalyst particles by combining a Ru(0) complex and a carrier fluid, followed by heating to nucleate the Ru(0) complex, which are then used in dehydrogenative silylation reactions to produce organosilicon compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-platinum catalysts are used for dehydrogenative silylation, then cost is reduced, but stability deteriorates due to sensitivity to oxygen and water
Solution Approach 1:
The patent introduces a platinum-containing catalyst system that acts as an intermediary to mediate between the reactants (silane and alkene). This catalyst system provides the necessary catalytic activity for dehydrogenative silylation while maintaining stability through its specific chemical composition and mechanism, resolving the contradiction between cost and stability by using a controlled amount of platinum in a stabilized form rather than relying on unstable non-platinum alternatives
Solution Approach 2:
The patent modifies the catalyst system by changing parameters such as the oxidation state of platinum (using Pt(0) or Pt(II) complexes), ligand composition, and catalyst structure. These parameter changes enable the catalyst to achieve both high stability resistance to oxygen and water, and effective catalytic activity for dehydrogenative silylation, thereby resolving the contradiction between stability and catalytic performance
2Productivity
If conventional catalysts are used for dehydrogenative silylation, then reaction can proceed, but selectivity deteriorates leading to unselective reactions and low yields
Solution Approach 1:
The patent applies local quality by designing catalyst systems with specific local electronic and steric properties. The catalyst complexes are engineered with particular ligand environments around the platinum center that create localized catalytic sites with high selectivity for dehydrogenative silylation, preventing unwanted side reactions and improving both yield and selectivity simultaneously
Solution Approach 2:
Instead of using conventional catalysts that promote addition reactions, the patent inverts the approach by using platinum catalysts specifically designed to promote dehydrogenative coupling. This inversion of the catalytic mechanism leads to selective formation of vinylsilanes rather than unwanted addition products, thereby improving both selectivity and yield
3Adaptability or versatility
If conventional dehydrogenative silylation conditions are used, then reaction can occur, but functional group tolerance deteriorates
Solution Approach 1:
The patent develops catalyst systems that possess multi-functionality and universality, enabling them to tolerate various functional groups (such as esters, amides, carbonyls, and other sensitive groups) while maintaining stable catalytic activity. The catalyst design allows it to perform dehydrogenative silylation selectively without reacting with or deactivating other functional groups present in the substrate, thereby achieving both versatility and stability
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
The catalyst particles exhibit high conversion rates and selectivity, enabling diverse applications in both heterogeneous and homogeneous conditions, with improved reaction yields and stability.
Implementation Method 1
heating the mixture at an elevated temperature to nucleate the Ru(0) complex and give the catalyst particles in the carrier fluid
Implementation Method 2
reacting via dehydrogenative coupling an organohydridochlorosilane compound and an alkene compound in the presence of a catalyst comprising the catalyst particles
Data Source
AI summary
A method of preparing catalyst particles (the “preparation method”) is disclosed. The preparation method comprises combining a Ru(0) complex and a carrier fluid to form a mixture and heating the mixture at an elevated temperature to nucleate the Ru(0) complex and give the catalyst particles in the carrier fluid. The preparation method optionally comprises isolating the catalyst particles from the carrier fluid. A method of preparing an organosilicon compound via dehydrogenative silylation with the catalyst particles (the “synthesis method”) is also disclosed. The synthesis method comprises reacting (A) an organohydridochlorosilane compound and (B) an alkene compound in the presence of (C) a catalyst, thereby preparing the organosilicon compound. The catalyst (C) of the synthesis method comprises the catalyst particles prepared by the preparation method.