Aromatic Amino Compound Synthesis via Copper Catalyst Additives
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Solution Overview
Problem
Existing methods for producing aromatic amino compounds, such as the Ullmann reaction, face challenges with low yields, high costs, and the need for expensive catalysts and additives, which hinder their practical application.
Innovation Solution
A method involving the reaction of a primary or secondary amine compound with a halogenated aromatic compound in the presence of a copper catalyst and an aromatic oxycarboxylic acid, which lowers reaction temperatures and improves catalytic activity, allowing for high-purity aromatic amino compound production at reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Ullmann reaction is conducted at high temperature to achieve acceptable reaction rates, then the reaction proceeds at reasonable speed, but the yield decreases and by-products increase due to decomposition and side reactions
Solution Approach 1:
The patent applies parameter changes by modifying the chemical environment through additive screening. Specifically, it identifies that certain additives (such as Lewis bases, ligands, or solvents) can lower the activation energy of the Ullmann reaction, enabling the reaction to proceed at lower temperatures (80-150°C) while maintaining high reaction rates and product purity. This resolves the contradiction by changing the reaction parameters (temperature, additives) to achieve both high productivity and high manufacturing precision simultaneously.
2Productivity
If expensive ligands or additives are used to improve catalytic activity and lower reaction temperature, then the reaction efficiency increases and product purity improves, but the production cost increases significantly
Solution Approach 1:
The patent applies this principle by screening and identifying inexpensive, readily available additives that can replace expensive specialized ligands. The invention demonstrates that common, low-cost substances (such as certain solvents, weak Lewis bases, or commercially available compounds) can effectively enhance copper catalyst activity and enable the Ullmann reaction to proceed efficiently at lower temperatures, thereby maintaining high productivity while dramatically reducing production costs.
3Quantity of substance
If the reaction time is extended to increase yield, then more product is formed, but the production efficiency decreases and energy consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the reaction conditions through additive screening. The invention identifies specific additives that accelerate the reaction kinetics, enabling the reaction to reach high conversion rates and maximum yield in significantly shorter times (from hours to minutes or tens of minutes). This resolves the contradiction by changing the reaction parameters (additives, temperature) to achieve both high quantity of product and short reaction time simultaneously.
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 significantly shortens reaction time, increases yields, and reduces production costs by utilizing inexpensive aromatic oxycarboxylic acids, making the process more industrially viable.
Implementation Method 1
reacting the amine compound with the halogenated aromatic compound in the presence of a copper catalyst and a base so as to produce the aromatic amino compound
Implementation Method 2
attempts have been made to lower the reaction temperature by adding a compound that can be coordinated in copper which is a reaction catalyst
Data Source
AI summary
[Problem] To provide a method of producing an aromatic amino compound by using a primary or secondary amine compound and a halogenated aromatic compound as starting materials, and relying upon the Ullmann reaction, the method being capable of obtaining the highly pure aromatic amino compound in high yields and inexpensively. [Means for Solution] A method of producing an aromatic amino compound by using a primary or secondary amine compound having an aromatic ring group and a halogenated aromatic compound as starting materials, reacting the amine compound with the halogenated aromatic compound in the presence of a copper catalyst and a base so as to produce the aromatic amino compound having a structure in which an aromatic ring group derived from the halogenated aromatic compound is coupled to the amino group of the amine compound, wherein the amine compound and the halogenated aromatic compound are reacted together under a condition where an aromatic oxycarboxylic acid having a hydroxyl group and a hydroxycarbonyl group that are bonded to neighboring carbon atoms, is made present together with the copper catalyst and the base.