Ether Carbonylation to Esters via Pd Catalyst
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Solution Overview
Problem
Current methods for preparing esters, such as alkoxycarbonylation, are limited to using ethylenically unsaturated compounds and require the addition of alcohols, which restricts the range of available starting materials.
Innovation Solution
A process involving the reaction of ethers with carbon monoxide in the presence of benzene-based diphosphine ligands, where no alcohol is added, allowing the direct conversion of ethers into esters using a Pd complex catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional alkoxycarbonylation methods are used, then esters can be prepared from ethylenically unsaturated compounds, but the process requires additional alcohol reactants and is limited to specific starting materials
Solution Approach 1:
The invention changes the fundamental reaction parameters by using ethers instead of ethylenically unsaturated compounds as starting materials and eliminating the need for additional alcohol reactants. This parameter change enables the use of a broader range of starting materials (including various ethers with 3-30 carbon atoms) while simplifying the overall process by removing the requirement for separate alcohol addition steps.
Solution Approach 2:
Instead of following the conventional approach of reacting olefins with CO and alcohols, the invention inverts the approach by reacting ethers directly with CO. This inversion of the reaction pathway eliminates the need for alcohol as a separate reactant and opens up new possibilities for starting materials, thereby improving versatility while maintaining process simplicity.
2Ease of manufacture
If additional alcohol is added to the reaction mixture, then the conventional alkoxycarbonylation can proceed, but this increases process steps and costs
Solution Approach 1:
The invention extracts and eliminates the alcohol reactant from the conventional alkoxycarbonylation process. By removing this necessary component from the reaction system, the process becomes simpler with fewer steps and lower costs, while the ether substrate itself provides the necessary oxygen source for ester formation.
Solution Approach 2:
The ether substrate serves multiple functions in the reaction: it acts as both the carbon source and the oxygen source for ester formation. This self-service capability eliminates the need for separate alcohol reactants, reducing the number of substances required and simplifying the manufacturing process.
3Reliability
If conventional catalyst systems are used, then olefin carbonylation can occur, but they are ineffective for ether carbonylation
Solution Approach 1:
The invention employs a specific Pd complex catalyst system with particular phosphine ligands that is optimized for ether carbonylation. This catalyst parameter change enables reliable conversion of ethers (with 3-30 carbon atoms including cyclic ethers) to esters, expanding substrate scope while maintaining high catalytic effectiveness and selectivity.
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 method enables the use of ethers as starting materials, eliminating the need for alcohols and providing a cost-effective and simple route to ester production, with significant yields achieved.
Implementation Method 1
adding a phosphine ligand and a compound comprising Pd, or adding a complex comprising Pd and a phosphine ligand
Implementation Method 2
heating the reaction mixture to convert the ether to an ester
Data Source
AI summary
The invention relates to a process comprising the following steps: a) providing an ether with 3 to 30 carbon atoms; b) adding a phosphine ligand and a compound comprising Pd, or adding a complex comprising Pd and a phosphine ligand; c) adding CO; d) heating the reaction mixture, wherein the ether is converted to an ester; wherein the phosphine ligand is a compound according to formula (I) where m and n are independently 0 or 1; R1, R2, R3, R4 are each independently selected from -(C1-C12)-alkyl, -(C3-C12)-cycloalkyl, -(C3-C12)-heterocycloalkyl, -(C6-C20)-aryl, -(C3-C20)-heteroaryl; at least one of the residues R1, R2, R3, R4 represents a -(C3-C20)-heteroaryl residue;and R1, R2, R3, R4, if these represent -(C1-C12)-alkyl, -(C3-C12)-cycloalkyl, -(C3-C12)-heterocycloalkyl, -(C6-C20)-aryl, or -(C3-C20)-heteroaryl, each independently with one or more substituents selected from -(C1-C12)-alkyl, -(C3-C12)-cycloalkyl, -(C3-C12)-heterocycloalkyl, -O-(C1-C12)-alkyl, -O-(C1-C12)-alkyl-(C6-C20)-aryl, -O-(C3-C12)-cycloalkyl, -S-(C1-C12)-alkyl, -S-(C3-C12)-cycloalkyl, -COO-(C1-C12)-alkyl, -COO-(C3-C12)-cycloalkyl, -CONH-(C1-C12)-alkyl, -CONH-(C3-C12)-cycloalkyl, -CO-(C1-C12)-alkyl, -CO-(C3-C12)-cycloalkyl, -N-[(C1-C12)-Alkyl]2, -(C6-C20)-Aryl, -(C6-C20)-Aryl-(C1-C12)-Alkyl, -(C6-C20)-Aryl-O-(C1-C12)-Alkyl, -(C3-C20)-Heteroaryl, -(C3-C20)-heteroaryl-(C1-C12)-alkyl, -(C3-C20)-heteroaryl-O-(C1-C12)-alkyl, -COOH, -SO3H, -NH2, halogen can be substituted, and no alcohol is added to the reaction mixture.