Halogenated Conjugated Diene Synthesis for Pinoxaden Derivatives
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Solution Overview
Problem
There is a lack of structurally novel halogenated conjugated diene compounds that can be used to synthesize derivatives with diverse chemical properties and biological activities, such as the herbicide Pinoxaden, which are not currently reported in the literature.
Innovation Solution
A method for preparing halogenated conjugated diene compounds through halogenation of specific compounds using halogenating agents like chlorine gas or sulfuryl chloride, followed by dehydrohalogenation and aromatization reactions, allowing for the synthesis of compounds with multifunctional groups that can be further converted into valuable derivatives like Pinoxaden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional synthesis methods are used, then known compounds are produced, but structurally novel halogenated conjugated diene compounds are not obtained
Solution Approach 1:
The patent applies parameter changes by modifying the halogenation conditions, including using different halogenating agents (Cl2, Br2, I2, NBS, NCS, SO2Cl2, PCl5, PBr5), varying reaction temperatures (-78°C to reflux), and employing different solvents to achieve structurally novel halogenated conjugated diene compounds that differ from conventional products
Solution Approach 2:
The patent employs intermediates such as halogenated enones and halogenated enals as key compounds in the synthesis pathway. These intermediates serve as versatile building blocks that can be further transformed into various derivatives including herbicides like Pinoxaden, thereby resolving the contradiction between structural novelty and practical availability
2Manufacturing precision
If multiple reaction steps are used for synthesis, then desired compounds are obtained, but the synthesis process becomes complex and time-consuming
Solution Approach 1:
The patent merges multiple reaction steps into a streamlined sequence where halogenation of compounds with conjugated diene structures directly yields halogenated conjugated diene compounds. The use of versatile intermediates allows for reduced synthesis steps while maintaining manufacturing precision, as these intermediates can be converted to final products through standardized transformations
3Adaptability or versatility
If conventional halogenation methods are used, then halogenated compounds are produced, but structurally novel derivatives with diverse biological activities are not synthesized
Solution Approach 1:
The patent establishes compounds of formula (I) as universal intermediates with multifunctional groups that can be transformed into various derivatives with different biological activities. The halogenated conjugated diene structure serves as a platform that maintains ease of manufacture while enabling diverse applications including herbicides, pharmaceuticals, and agrochemicals
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 approach provides a novel method for synthesizing halogenated conjugated diene compounds that can be used to produce valuable compounds like Pinoxaden, offering a structurally novel solution for synthesizing herbicides and other derivatives with practical application values.
Implementation Method 1
halogenating compound (2) in the presence of a halogenating agent to obtain the compound (1)
Implementation Method 2
subjecting compound (1) to dehydrohalogenation and aromatization reactions to produce the compound (3)
Implementation Method 3
subjecting compound (1) to dehydrohalogenation and aromatization reactions to produce the compound (3)
Data Source
AI summary
Disclosed are a type of halogenated conjugated diene compounds (1), and preparation and application thereof. In this method, a conjugated diene compounds is subjected to halogenation reaction to prepare the compound (1). This disclosure further provides a method of preparing a 2-arylmalonic acid derivative from the compound (1) through dehydrohalogenation and aromatization reaction.