Monoalkylphenol Bisphosphite Ligands for Aldehyde-Selective Hydroformylation
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Solution Overview
Problem
Existing hydroformylation processes face challenges in achieving high yields of aldehydes from olefins using conventional bisphosphite compounds.
Innovation Solution
The use of bisphosphite compounds with specific alkyl and hydrogen residues, such as structures (1) and (2), in combination with rhodium catalysts, to enhance the hydroformylation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bisphosphite compounds are used in hydroformylation, then the process is simple and well-established, but the yield of aldehydes is insufficient
Solution Approach 1:
The patent modifies the molecular structure of conventional bisphosphite compounds by changing specific parameters: introducing monoalkylphenol wing components with alkyl groups at positions 2, 4, or 6, and incorporating specific residue combinations (R1-R6) that include tert-butyl groups, hydrogen atoms, and aromatic rings. These structural parameter changes enhance the ligand's ability to stabilize the rhodium catalyst and promote aldehyde formation, achieving yields up to 41% while maintaining reasonable structural complexity
Solution Approach 2:
The invention creates composite ligand structures by combining different functional components: bisphosphite core structures with monoalkylphenol wing components, aromatic rings with alkyl substituents, and specific residue arrangements. This composite approach integrates multiple beneficial properties into a single ligand molecule, resulting in superior catalytic performance compared to conventional bisphosphite compounds
2Productivity
If the structure of bisphosphite compounds is modified to improve yield, then aldehyde yield increases, but the synthesis complexity increases
Solution Approach 1:
The complex bisphosphite ligand is divided into manageable synthetic segments: starting materials (phenols, phosphites), intermediate chlorophosphite compounds, and final coupled products. Each segment can be synthesized and purified separately using standard organic chemistry techniques, making the overall manufacturing process more feasible despite the complex final structure
Solution Approach 2:
The synthesis strategy employs preliminary actions by first preparing chlorophosphite intermediates with the desired aromatic substituents, then coupling these with phenolic components in controlled steps. This preliminary preparation of key intermediates simplifies the final assembly and allows for optimization of each synthetic step independently, improving overall ease of manufacture
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 proposed compounds significantly improve the yield of aldehydes in hydroformylation reactions, achieving yields of up to 41% compared to conventional bisphosphite compounds.
Implementation Method 1
the substance comprising Rh is selected from: Rh(acac)(CO)2, Rh(acac)(cod) (Umicore, acac = acetylacetonate anion; cod = 1,5-cyclooctadiene), Rh4CO12
Data Source
AI summary
Bisphosphites with a monoalkylphenol wing component and their use in hydroformylation.