Group 8 Metal Complex Metathesis Catalysts
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Solution Overview
Problem
Current metathesis catalysts for producing linear alpha-olefins (LAOs) are inefficient, generate unwanted by-products, waste reactants and energy, and rely on non-renewable feedstocks, with existing ruthenium-based catalysts being too expensive due to costly synthesis routes.
Innovation Solution
Development of Group 8 metal complexes as metathesis catalysts, specifically represented by a formula with a Group 8 metal, anionic ligands, hydrocarbyl groups, and neutral donor ligands, which demonstrate high activity and selectivity in ring-opening cross metathesis (ROCM) and ring-opening metathesis polymerization (ROMP) transformations, offering mild and affordable synthetic routes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ruthenium-based catalysts are used for metathesis reactions, then catalytic activity and functional group tolerance are improved, but catalyst cost and synthesis complexity increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by replacing ruthenium with iron-based metals and modifying the ligand structure. This parameter change maintains catalytic activity while simplifying synthesis and reducing cost, directly resolving the contradiction between reliability and complexity
Solution Approach 2:
The invention employs inexpensive iron-based catalysts that can be used under mild conditions without requiring complex stabilization or recovery procedures. This approach trades potential catalyst longevity for dramatically reduced complexity and cost, resolving the contradiction favorably
2Productivity
If conventional metathesis catalysts are used for LAO production, then catalytic function is achieved, but by-product formation and energy consumption increase
Solution Approach 1:
The patent employs catalysts with specifically designed local properties - iron-based metals with tailored ligand environments that create optimal electronic and steric conditions for selective metathesis. This local quality optimization enables high productivity while minimizing unwanted side reactions and by-product formation
Solution Approach 2:
The invention converts the typically problematic issue of catalyst reactivity into a benefit by using iron-based catalysts that are sufficiently reactive to drive metathesis efficiently but selectively enough to avoid excessive by-product formation. The mild reaction conditions required by these catalysts also reduce energy consumption while maintaining productivity
3Reliability
If traditional catalyst synthesis routes are used, then catalyst performance is achieved, but production cost and environmental impact increase
Solution Approach 1:
The patent fundamentally changes the synthesis parameters by using iron-based metals instead of ruthenium, employing simpler ligand synthesis routes, and conducting reactions under milder conditions. These parameter changes collectively reduce energy consumption and environmental impact while maintaining catalyst performance
Solution Approach 2:
The invention adopts inexpensive iron-based catalysts that can be prepared through simplified routes and used under mild conditions, eliminating the need for energy-intensive synthesis and complex recovery processes. This approach maintains adequate performance while dramatically reducing energy loss and environmental footprint
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 Group 8 metal complexes provide efficient, selective, and cost-effective production of desirable olefins and polyolefins, utilizing renewable feedstocks and reducing environmental impact by minimizing by-product formation and energy consumption.
Implementation Method 1
Olefin metathesis may be catalyzed by one or more catalytic metals, usually one or more transition metals, such as the molybdenum-containing Schrock catalyst and the ruthenium- or osmium-containing Grubbs catalysts
Data Source
AI summary
This invention relates to a metathesis catalyst comprising a Group 8 metal complex represented by the formula:wherein:M is a Group 8 metal; each X is independently an anionic ligand; R1 and R2 are independently selected from the group consisting of hydrogen, a C1 to C30 hydrocarbyl, and a C1 to C30 substituted hydrocarbyl; R3 and R4 are independently selected from the group consisting of hydrogen, C1 to C12 hydrocarbyl groups, substituted C1 to C12 hydrocarbyl groups, and halides; and L is a neutral donor ligand. This invention also relates to processes for performing a metathesis reaction, in particular ring opening cross metathesis reactions and ring opening metathesis polymerization reactions, using the Group 8 metal complexes.