Ylide-Functionalized Phosphane Ligands for Versatile Metal Catalysis
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Solution Overview
Problem
Existing catalytic systems for organic reactions, such as Suzuki, Heck, and Sonogashira coupling reactions, often require more cost-effective starting substrates, higher catalyst productivity, and broader substrate and reaction diversity, which are not adequately addressed by current phosphane ligands.
Innovation Solution
Development of ylide-functionalized phosphine ligands with specific structures and transition metal complexes, particularly those of copper, silver, platinum, palladium, and nickel, which can be used in homogeneous catalysis for reactions like hydrofunctionalization, hydroamination, and coupling reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional phosphane ligands are used in catalytic reactions, then basic catalytic function is achieved, but catalyst activity, selectivity, and substrate diversity are insufficient
Solution Approach 1:
The patent applies local quality by introducing ylide functional groups at specific positions on the phosphane ligand structure. The ligand contains both phosphane groups (PPh2) and ylide groups (C=NR2) with distinct electronic properties, allowing different regions of the ligand to provide complementary functions: the phosphane provides basic coordination while the ylide contributes to enhanced electronic modulation and steric control, thereby improving both catalyst activity and substrate diversity simultaneously
Solution Approach 2:
The patent employs composite materials by combining phosphane and ylide functional groups into a single hybrid ligand system. This composite ligand structure integrates the beneficial properties of both phosphane (good σ-donor, moderate π-acceptor) and ylide (strong σ-donor, weak π-acceptor) characteristics, creating a ligand with optimized electronic and steric parameters that enhances catalyst performance across multiple reaction types and substrates
2Productivity
If catalyst productivity is increased to meet production requirements, then reaction efficiency improves, but cost-effectiveness of starting substrates decreases
Solution Approach 1:
The patent applies parameter changes by systematically modifying the electronic and steric parameters of the phosphane ligand through ylide functionalization. By adjusting the R2 substituents on the ylide nitrogen and the R1 substituents on the phosphane, the catalyst's activity and selectivity parameters are optimized to achieve high productivity with less expensive substrates, thereby improving cost-effectiveness while maintaining high catalyst productivity
3Ease of manufacture
If ligand structure is simplified for ease of synthesis, then manufacturing becomes easier, but catalyst selectivity and activity are reduced
Solution Approach 1:
The patent applies segmentation by designing the ligand as modular components that can be synthesized separately and then assembled. The ligand consists of distinct phosphane and ylide segments that can be prepared through independent synthetic routes using commercially available reagents, followed by coupling reactions. This modular approach maintains manufacturing simplicity while allowing optimization of the final ligand structure for high catalyst selectivity and activity
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
Enhances catalyst activity, selectivity, and substrate diversity, providing more efficient and versatile catalytic processes for organic synthesis.
Implementation Method 1
Metal complexes of phosphine ligands having the formula (I) or (II) wherein On is a phosphonium group
Implementation Method 2
They can be used in homogeneous catalysis, in particular in coupling reactions
Data Source
AI summary
The invention relates to ylide-functionalised phosphane ligands, the production of same and use in transition metal compounds, as well as the use of same as catalysts in organic reactions.