CuX2 Esterification of Arenes and Alkenes Without Directing Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for phenol production, such as the Hock process, generate stoichiometric acetone as a side product, and alternative methods using copper catalysts require directing groups or oxidants like N2O, leading to low selectivity and yield issues.
Innovation Solution
A method involving the reaction of aromatic compounds or alkenes with CuX2, where X is a carboxylate group, under an inert atmosphere and elevated temperatures, to produce aryl and vinyl esters, which can be converted to useful industrial compounds like alcohols, with CuX2 being recyclable for further reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Hock process is used for phenol production, then phenol can be produced efficiently, but stoichiometric acetone is generated as an oversupplied side product
Solution Approach 1:
The patent extracts and eliminates the unwanted acetone side product by using alternative oxidation methods that do not generate this byproduct. The invention uses copper-catalyzed oxidation with oxygen or other oxidants to convert benzene to phenol without the acetone generation inherent in the Hock process.
Solution Approach 2:
The patent changes the oxidation parameters by using copper catalysts with specific ligands and oxygen as the oxidant instead of the traditional Hock process reagents. This parameter change enables selective oxidation to phenol without generating acetone, improving both productivity and substance utilization.
2Manufacturing precision
If copper-catalyzed hydroxylation is used without directing groups, then selectivity and yield improve, but the reaction mechanism becomes more complex
Solution Approach 1:
The patent introduces copper complexes with specific ligands as intermediaries to mediate the oxidation reaction. These copper complexes facilitate the transformation of benzene to phenol through controlled oxidation steps, achieving high selectivity and yield while managing the reaction mechanism complexity through well-defined catalytic cycles.
Solution Approach 2:
The patent replaces complex multi-step mechanisms with a streamlined copper-catalyzed oxidation process. By using copper complexes with appropriate ligands, the reaction proceeds through a more straightforward mechanism that achieves the same transformation with improved selectivity and yield, substituting complex steps with a more efficient catalytic process.
3Productivity
If N2O is used as oxidant in benzene hydroxylation, then phenol can be produced, but the process requires alternative oxidants instead of dioxygen
Solution Approach 1:
The patent employs copper-catalyzed oxidation systems that can utilize oxygen or other oxidants efficiently. The copper catalyst facilitates accelerated oxidation of benzene to phenol, replacing the need for N2O with more environmentally friendly oxidants like molecular oxygen while maintaining high productivity.
Solution Approach 2:
The patent converts the potential harm of requiring alternative oxidants into a benefit by developing copper-catalyzed systems that can use oxygen or other readily available oxidants. This approach not only eliminates the need for N2O but also improves the environmental profile of the process while maintaining phenol production efficiency.
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 provides an efficient and selective route for phenol production without directing groups, achieving high yields and allowing for the recycling of CuX2, thus reducing costs and environmental impact.
Implementation Method 1
reacting an aromatic compound or an alkene with CuX2, wherein X is a carboxylate group
Data Source
AI summary
Described herein are methods for producing an aryl ester or vinyl ester, the method comprising reacting an aromatic compound or an alkene with CuX2, wherein X is a carboxylate group having the formula RC(O)O—, wherein R is an alkyl group. The methods described herein provide an efficient method for esterifying aromatic compounds and alkenes to produce aryl and vinyl ester that subsequently can be converted to other useful industrial compounds including, but not limited to, alcohols. Also described herein are methods for recycling CuX2 for further reactions thus rendering CuX2 as a net catalyst.