Alkyl Picolyl Ligands for Higher Ester Yield in Alkoxycarbonylation
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Solution Overview
Problem
Existing alkoxycarbonylation processes face challenges in achieving high yields of esters from ethylenically unsaturated compounds using palladium-based catalysts.
Innovation Solution
The use of novel alkyl picolyl ligands in combination with palladium compounds, co-catalysts, and specific reaction conditions enhances the yield of esters by optimizing the alkoxycarbonylation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ligands are used in palladium-catalyzed alkoxycarbonylation, then the process is simpler to implement, but the ester yield is lower
Solution Approach 1:
The patent modifies the ligand structure by changing parameters such as the backbone type (pyridine vs. pyrimidine), substituent positions (2-, 3-, 4-positions), and alkyl group types. These parameter changes in the ligand structure result in significant improvements in ester yield, with optimized ligands achieving up to 62% yield compared to conventional ligands.
2Productivity
If reaction conditions are optimized for higher yield, then ester production increases, but energy consumption and process complexity increase
Solution Approach 1:
The patent optimizes reaction parameters including temperature (80-160°C), CO pressure (1-5 MPa), and catalyst loading (0.1-1.0 mol%). The optimized conditions achieve high ester yields while maintaining reasonable energy consumption by finding the optimal balance between temperature and reaction time.
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 novel ligands significantly improve the yield of esters, achieving up to 62% compared to comparative ligands, demonstrating enhanced efficiency in the alkoxycarbonylation process.
Implementation Method 1
the reaction of ethylenically unsaturated compounds (olefins) with carbon monoxide and alcohols in the presence of a metal-ligand complex to give the corresponding esters. Typically, the metal used is palladium.
Data Source
AI summary
Alkyl picolyl ligands and use thereof in alkoxycarbonylation.