Omega-Hydroxycarboxylic Acid Ester Synthesis via Selective Ru Hydrogenolysis
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Solution Overview
Problem
Existing processes for preparing omega-hydroxycarboxylic acid esters suffer from low yield and selectivity issues.
Innovation Solution
A process involving the conversion of a trioxane derivative using a phosphine ligand, a Ru compound, and hydrogen gas (H2) under controlled conditions, including specific reaction parameters such as temperature and pressure, to produce omega-hydroxycarboxylic acid esters with improved yield and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing processes are used for preparing omega-hydroxycarboxylic acid esters, then the production can be achieved, but the yield and selectivity are low
Solution Approach 1:
The patent applies parameter changes by optimizing reaction conditions including temperature ranges (40-120°C), pressure ranges (1-5 MPa H2), and molar ratios of reactants. The use of specific catalyst systems with defined ligand-to-metal ratios and controlled addition sequences represents parameter optimization to achieve both high yield (>98%) and high selectivity (n:iso > 99:1).
Solution Approach 2:
The patent employs phosphine ligands as intermediaries that mediate between the Ru compound catalyst and the trioxane derivative substrate. The phosphine ligand forms a coordinated complex with Ru that enables selective hydrogenolysis of the trioxane ring, acting as a mediator that controls both the activity and selectivity of the catalytic system.
2Reliability
If existing processes are used for preparing omega-hydroxycarboxylic acid esters, then the production can be achieved, but the selectivity ratio (n:iso) is poor
Solution Approach 1:
The patent applies local quality by creating a specific catalytic environment through the combination of Ru compound and phosphine ligand that provides localized selectivity at the reaction site. The phosphine ligand modifies the local electronic and steric environment around the Ru center, enabling preferential formation of the n-isomer over the iso-isomer while maintaining high overall conversion.
3Productivity
If a Ru compound and phosphine ligand are used for the conversion, then high yield and selectivity are achieved, but the process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the reaction process into distinct sequential steps: (a) submitting trioxane derivative, (b) adding phosphine ligand, (c) adding Ru compound, (d) adding H2O, (e) feeding H2, and (f) heating. This segmented approach allows each component to be optimized independently while maintaining overall process control and reproducibility.
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 yields and selectivity in the production of omega-hydroxycarboxylic acid esters, with yields exceeding 98% and selectivity ratios of n:iso greater than 99:1.
Implementation Method 1
adding a Ru compound; whereby the trioxane derivative is converted into an omega-hydroxycarboxylic acid ester
Implementation Method 2
feeding H2; whereby the trioxane derivative is converted into an omega-hydroxycarboxylic acid ester
Implementation Method 3
heating the reaction mixture from a) to e), whereby the trioxane derivative is converted into an omega-hydroxycarboxylic acid ester
Data Source
AI summary
Process for the preparation of an omega-hydroxycarboxylic acid ester starting from a trioxane derivative.