Nitro Compound Synthesis via Segmented Catalytic Steps
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Solution Overview
Problem
Current methods for producing specific nitro compounds, such as 2-halomethylnitrobenzene, are inefficient and lack industrial scalability.
Innovation Solution
A method involving the reaction of a compound represented by formula (2) with a compound represented by formula (3), followed by treatment with hypohalogenous acid or its salt, and subsequent reduction, to produce a compound represented by formula (1), which includes steps carried out in the presence of copper iodide and a heterogeneous platinum group catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce 2-halomethylnitrobenzene, then the production process can be carried out, but the efficiency is low and industrial scalability is poor
Solution Approach 1:
The production process is divided into three distinct sequential steps: (1) reacting compound (2) with compound (3) to obtain compound (4), (2) reacting compound (4) with hypohalogenous acid or its salt to obtain compound (5), and (3) reducing compound (5) to obtain the final nitro compound (1). This segmentation allows each step to be optimized independently for industrial scalability while maintaining overall production efficiency.
Solution Approach 2:
The patent introduces intermediate compounds (4) and (5) as mediators in the synthesis pathway. Compound (4) serves as an intermediate formed from the reaction of compound (2) with compound (3), and compound (5) serves as a halogenated intermediate that is subsequently reduced to the final product. These intermediaries enable a controlled, stepwise transformation that improves both efficiency and scalability.
2Productivity
If the reaction is carried out with multiple reagents and catalysts, then the production efficiency improves, but the process complexity increases
Solution Approach 1:
The use of multiple reagents and catalysts is justified by segmenting the process into distinct steps, where each step has a specific function. Step 1 uses compound (3) to form compound (4), step 2 uses hypohalogenous acid to form compound (5), and step 3 uses a reducing agent to produce compound (1). This functional segmentation makes the complexity manageable and each reagent's role well-defined.
Solution Approach 2:
The patent employs parameter changes by selecting specific reagents and conditions for each step: compound (3) with specific structural parameters (R2, R3, R6, R7), hypohalogenous acid (providing X = Cl or Br), and reducing agents with specific properties. These parameter selections optimize each step's efficiency while keeping the overall process systematic and controllable.
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 allows for the industrially advantageous production of nitro compounds, enhancing scalability and efficiency in producing intermediates useful for pest control applications.
Implementation Method 1
reacting a compound represented by formula (2) with a compound represented by formula (3) and a secondary amine represented by formula (3′), to obtain a compound represented by formula (4′) wherein the reaction is carried out in the presence of copper iodide
Implementation Method 2
reacting the compound represented by formula (4) with a hypohalogenous acid (hypochlorous acid or hypobromous acid) or a salt thereof to obtain a compound represented by formula (5)
Implementation Method 3
reducing the compound represented by formula (5) to obtain the compound represented by formula (1) wherein the compound represented by formula (5) is reduced in the presence of a heterogeneous platinum group catalyst and formic acid or a salt thereof
Implementation Method 4
reducing the compound represented by formula (5) to obtain the compound represented by formula (1) wherein the compound represented by formula (5) is reduced in the presence of a heterogeneous platinum group catalyst and formic acid or a salt thereof
Data Source
AI summary
A compound represented by formula (1):can be produced by:a step wherein a compound represented by formula (2):is reacted with a compound represented by formula (3):thereby obtaining a compound represented by formula (4):a step wherein a compound represented by formula (4) is reacted with hypohalogenous acid or a salt thereof, thereby obtaining a compound represented by formula (5):and a step wherein a compound represented by formula (5) is reduced.