Ru(0) Complex Catalyst for Selective Vinyl- and Ethylchlorosilane Preparation
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Solution Overview
Problem
Existing catalysts for hydrosilylation and dehydrogenative silylation reactions are prone to instability due to sensitivity to oxygen, water, and light, leading to unselective reactions and low yields, especially for minimally substituted olefins.
Innovation Solution
A method involving the reaction of a hydridochlorosilane compound with ethylene in the presence of a Ru(0) complex catalyst, allowing for selective preparation of vinylchlorosilanes and ethylchlorosilanes through tunable silylation, which facilitates dehydrogenative coupling or hydrosilylation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-platinum catalysts are used for dehydrogenative silylation reactions, then cost is reduced, but catalyst stability deteriorates due to sensitivity to oxygen, water, and light
Solution Approach 1:
The patent employs a Ru(0) complex catalyst that operates under modified reaction parameters including controlled atmosphere and temperature conditions, enabling the catalyst to maintain stability while providing cost advantages over platinum-based catalysts. The Ru(0) complex specifically facilitates dehydrogenative silylation with improved reliability under these controlled conditions.
2Productivity
If conventional dehydrogenative silylation conditions are used, then reaction proceeds, but selectivity deteriorates leading to unselective reactions and undesirable product mixtures
Solution Approach 1:
The patent utilizes a Ru(0) complex catalyst that enables selective dehydrogenative silylation by modifying reaction parameters such as temperature, pressure, and atmosphere control. This selective catalysis prevents side reactions and ensures high selectivity for the desired vinyl- or ethyl-functionalized chlorosilane products while maintaining productive reaction rates.
3Adaptability or versatility
If minimally substituted olefins are used in dehydrogenative silylation, then substrate availability is improved, but reaction selectivity deteriorates resulting in low yields
Solution Approach 1:
The Ru(0) complex catalyst in the patent is specifically designed to work with minimally substituted olefins by optimizing reaction conditions including temperature, pressure, and atmosphere. The catalyst maintains high selectivity for these substrates through its unique electronic and steric properties, enabling successful dehydrogenative silylation where conventional catalysts fail.
4Adaptability or versatility
If functional group tolerance is improved in dehydrogenative silylation, then application scope is expanded, but reaction conditions become more complex
Solution Approach 1:
The patent employs a Ru(0) complex catalyst that provides inherent functional group tolerance through optimized reaction parameters including controlled temperature, pressure, and atmosphere. This approach achieves broad substrate compatibility without requiring excessively complex reaction conditions, as the catalyst itself provides the necessary selectivity 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
This method achieves high conversion and yield of the desired organosilicon compounds, with the ability to recover and recycle the catalyst, thereby enhancing the efficiency and selectivity of the silylation reactions.
Implementation Method 1
dehydrogenative coupling or hydrosilylation reactions
Implementation Method 2
in the presence of (C) a catalyst comprising a Ru(0) complex
Implementation Method 3
dehydrogenative coupling or hydrosilylation reactions
Implementation Method 4
in the presence of (C) a catalyst comprising a Ru(0) complex
Data Source
AI summary
A method of preparing an organosilicon compound via selective silylation of ethylene is disclosed. The method comrises prises reacting via silylation (A) a hydridochlorosilane compound and (B) ethylene in the presence of (C) a catalyst, thereby preparing the organosilicon compound. The silylation may be selectively conducted as a dehydrogenative coupling to prepare the organosilicon ompound as a vinylchlorosilane compound, or as a hydrosilylation to prepare the organosilicon compound as an ethylchlorosilane compound. The catalyst (C) comprises a Ru(0) complex, and may be recycled for use in subsequent silylation reactions without purification. The organosilicon compound prepared according to the method is also disclosed.