Ru-Catalysed Domino Esterification with Imidazole Ligands
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Solution Overview
Problem
Existing processes for converting olefins into carboxylic acids or esters require intermediate isolation and do not directly produce esters with the alcohol part having one more carbon than the employed olefin.
Innovation Solution
A process involving the use of a ruthenium-catalysed domino hydroformylation/hydrogenation/esterification using imidazole ligands, where an ethylenically unsaturated compound is converted directly into an ester or diester without intermediate isolation, by adding a specific ligand and acid, and feeding in CO, with optional hydrogenation and heating to achieve the desired product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing processes for converting olefins into carboxylic acids or esters are used, then the conversion can be achieved, but intermediate isolation is required and the process complexity increases
Solution Approach 1:
The patent combines three separate reaction steps (hydroformylation, hydrogenation, and esterification) into a single integrated catalytic process using a ruthenium catalyst with imidazole ligands. This merging eliminates the need for intermediate isolation steps, reducing process complexity while maintaining high productivity. The catalyst system performs all three transformations in one pot, directly converting olefins to esters with one additional carbon atom.
Solution Approach 2:
The ruthenium catalyst with imidazole ligands exhibits multi-functionality by catalyzing hydroformylation, hydrogenation, and esterification reactions simultaneously. This universal catalyst system can handle multiple reaction types without requiring separate catalysts or process steps, thereby simplifying the overall process while improving efficiency.
2Productivity
If intermediate isolation steps are performed, then reaction control is improved, but the production time increases
Solution Approach 1:
The patent implements continuous catalytic action by maintaining the ruthenium catalyst in the reaction mixture throughout all three transformation steps. The catalyst remains active and selective without requiring intermediate isolation, ensuring continuous useful action from olefin to final ester product. This continuity eliminates time losses associated with isolation steps while the catalyst's inherent selectivity maintains reliable reaction control.
Solution Approach 2:
The imidazole ligands act as intermediaries that stabilize the ruthenium catalyst and facilitate the sequential reactions. These ligands mediate the interaction between the catalyst and substrates, ensuring smooth progression through hydroformylation, hydrogenation, and esterification without requiring intermediate separation, thus maintaining both speed and control.
3Productivity
If multiple reaction steps are combined in one process, then productivity increases, but the selectivity and product purity may decrease
Solution Approach 1:
The patent achieves local quality by designing the ruthenium catalyst with specific imidazole ligands that create a tailored active site geometry. This localized catalytic environment provides high selectivity for the desired ester product even while performing multiple reactions. The specific ligand structure ensures that hydroformylation, hydrogenation, and esterification occur with the correct regioselectivity and stereoselectivity, maintaining manufacturing precision throughout the integrated process.
Solution Approach 2:
The patent optimizes reaction parameters including CO pressure (1-100 bar), temperature (50-150°C), and ligand structure to achieve both high productivity and selectivity. By carefully controlling these parameters, the integrated process maintains precise control over product formation, ensuring that the direct conversion to esters proceeds with high selectivity without requiring intermediate isolation.
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 process efficiently converts olefins into esters with the alcohol part having one additional carbon, achieving high yields and bypassing the need for intermediate isolation, as demonstrated by the use of specific ruthenium compounds and imidazole ligands in the described reaction conditions.
Implementation Method 1
Ru-catalysed domino hydroformylation / hydrogenation / esterification
Implementation Method 2
Ru-catalysed domino hydroformylation / hydrogenation / esterification
Implementation Method 3
Ru-catalysed domino hydroformylation / hydrogenation / esterification
Data Source
AI summary
Ru-catalysed domino hydroformylation/hydrogenation/esterification using imidazole ligands.