Poly-substituted Aryl Herbicides for Broad-Spectrum Weed Control
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Solution Overview
Problem
Current herbicides lack effective broad-spectrum weed control with excellent crop selectivity and environmental profiles, particularly for woody plants, grasses, and sedges, and their derivatives do not adequately address the need for pre- and post-emergence herbicidal applications.
Innovation Solution
Development of novel 6-(poly-substituted aryl)-4-aminopicolinates and their derivatives, which are designed to be used as herbicides, offering improved herbicidal activity and selectivity through specific chemical structures that can be applied pre- or post-emergence, targeting a broad spectrum of weeds while minimizing impact on crops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current herbicides are used, then broad-spectrum weed control is achieved, but crop selectivity is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific substituent patterns at defined positions on the aryl ring. The 6-(poly-substituted aryl) structure with substituents at specific positions (e.g., 2,3,4-trisubstituted or 2-fluoro-4,5-trisubstituted phenyl groups) creates localized chemical characteristics that enable differential uptake or metabolism between crops and weeds, achieving both broad-spectrum control and crop selectivity
Solution Approach 2:
The patent employs parameter changes by systematically varying the substituents (halogen, alkoxy, alkyl, amino groups) at different positions on the aryl ring. These chemical parameter modifications alter the herbicide's physical and chemical properties including solubility, volatility, and binding affinity, thereby achieving enhanced crop selectivity while maintaining broad-spectrum activity
2Reliability
If current herbicides are used, then weed control is achieved, but environmental profile is inadequate
Solution Approach 1:
The patent applies the extraction principle by removing highly persistent and environmentally harmful substituents from the herbicide structure. The use of biodegradable substituents such as alkoxy, alkyl, and amino groups instead of highly persistent halogenated compounds reduces environmental accumulation while maintaining weed control efficacy through optimized molecular design
Solution Approach 2:
The patent uses parameter changes to modify environmental fate by selecting substituents with different degradation rates and metabolic pathways. The poly-substituted aryl structure with specific functional groups alters the herbicide's persistence, mobility, and toxicity parameters, achieving effective weed control with improved environmental safety profile
3Power
If current herbicides are used, then herbicidal activity is achieved, but application timing flexibility is limited
Solution Approach 1:
The patent applies universality by designing the 6-(poly-substituted aryl)-4-aminopicolinic acid structure to function effectively across multiple application scenarios. The molecular structure provides both pre-emergence and post-emergence activity against diverse weed types including woody plants, grasses, and broadleaves, enabling flexible application timing decisions based on field conditions
Data Source
AI summary
4-Aminopicolinic acids having tri- and tetra-substituted aryl substituents in the 6-position, and their amine and acid derivatives of the formula I are potent herbicides demonstrating a broad spectrum of weed control.