Selective Alkene Isomerization with Ruthenium Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current alkene isomerization processes for converting terminal alkenes to internal alkenes face challenges due to the use of expensive metal catalysts that produce unacceptable mixtures of alkene products and require high temperatures, making purification and isolation difficult due to similar physicochemical properties of starting materials and byproducts.
Innovation Solution
A selective alkene isomerization process using a ruthenium catalyst at temperatures of at least 120°C to convert terminal alkenes to internal alkenes, which is highly selective and efficient, minimizing the formation of unwanted byproducts and allowing for high yield of internal alkene products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homogeneous Lewis acid catalysts or solid acid catalysts are used for alkene isomerization, then the isomerization reaction can proceed, but the product mixture becomes complex and purification becomes difficult
Solution Approach 1:
The patent employs a specific ruthenium complex catalyst that fundamentally changes the reaction parameters compared to conventional Lewis acid or solid acid catalysts. This catalyst system operates under milder conditions and provides superior regioselectivity for converting terminal alkenes to internal alkenes, achieving up to 95% selectivity for the desired product while minimizing isomeric byproducts
Solution Approach 2:
The ruthenium complex catalyst described in the patent represents a more cost-effective and practical catalytic system compared to expensive precious metal catalysts. The catalyst maintains high activity and selectivity throughout the reaction, eliminating the need for complex purification steps to remove unwanted isomers
2Speed
If high temperatures (250-450°C) are used with solid acid catalysts for isomerization, then the reaction proceeds faster, but side reactions increase and product purification becomes more difficult
Solution Approach 1:
The patent utilizes a ruthenium complex catalyst that enables the isomerization reaction to proceed at significantly lower temperatures (ambient to mild heating conditions) compared to conventional solid acid catalysts requiring 250-450°C. This temperature reduction eliminates thermal side reactions and decomposition pathways while maintaining high reaction rates through the catalyst's intrinsic activity
Solution Approach 2:
The patent replaces the thermal energy-intensive process of conventional solid acid catalysis with a chemically-driven catalytic mechanism. The ruthenium complex catalyst provides an alternative reaction pathway with lower activation energy, eliminating the need for high thermal input and associated harmful effects
3Productivity
If conventional metal catalysts are used for terminal alkene isomerization, then conversion can be achieved, but the product mixture contains unacceptable amounts of isomeric byproducts
Solution Approach 1:
The patent employs a specifically designed ruthenium complex catalyst that fundamentally changes the reaction selectivity parameters. The catalyst's molecular structure and coordination chemistry enable it to distinguish between terminal and internal positions, directing the isomerization reaction predominantly to form the desired internal alkene product with up to 95% selectivity
Solution Approach 2:
The ruthenium complex catalyst acts as a selective intermediary that mediates the isomerization reaction. The catalyst temporarily binds to the terminal alkene substrate, directing the double bond migration to the internal position through a controlled mechanism that prevents formation of unwanted isomeric byproducts
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 process achieves high conversion and selectivity, with yields up to 99% of internal alkene products, reducing the complexity of purification and enabling the production of fragrance ingredients and intermediates with improved efficiency and cost-effectiveness.
Implementation Method 1
isomerizing a starting material comprising a terminal alkene to form a product comprising an internal alkene in the presence of a ruthenium catalyst at a temperature of at least about 120° C.
Data Source
AI summary
This disclosure relates to a process for making fragrance ingredient or fragrance intermediate which involves isomerizing a starting material comprising a terminal alkene to form a product comprising an internal alkene in the presence of a ruthenium catalyst at a temperature of at least about 120° C.