Aryloxypyrimidinyl Ethers for Selective Weed Control
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Solution Overview
Problem
Current herbicides for controlling undesirable vegetation in crops and noncrop areas are often ineffective, costly, toxic, and environmentally harmful, with a need for compounds that are more selective, cost-effective, and environmentally safer.
Innovation Solution
Development of aryloxypyrimidinyl ethers, their N-oxides, and salts, which are used in herbicidal compositions to selectively control weeds in crops such as rice, soybean, and sugar beet, by forming herbicidal mixtures with additional active ingredients like photosystem II inhibitors and auxin mimics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing herbicides are used to control undesirable vegetation, then weed control is achieved, but environmental harm and toxicity increase
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of herbicide compounds to create new aryloxypyrimidinyl ether derivatives with improved safety profiles. Specifically, the invention changes molecular parameters such as substituting different alkyl groups (methyl, ethyl, propyl, butyl), introducing halogen atoms (fluorine, chlorine, bromine), and varying the pyrimidine ring substitutions to achieve effective weed control with reduced environmental toxicity compared to existing herbicides
2Reliability
If existing herbicides are used for weed control, then vegetation control is achieved, but costs increase
Solution Approach 1:
The patent addresses cost-effectiveness through parameter changes in chemical synthesis by developing aryloxypyrimidinyl ether derivatives that can be manufactured using standard organic synthesis techniques. The invention utilizes readily available starting materials and common chemical reactions to produce the herbicidal compounds, aiming to reduce manufacturing costs compared to more complex or specialized herbicide structures
3Productivity
If selective weed control is implemented in crops, then crop productivity is protected, but herbicide specificity requirements increase
Solution Approach 1:
The patent applies local quality by designing herbicide molecules with specific local structural features that provide selective toxicity. The aryloxypyrimidinyl ether compounds incorporate particular substituent patterns and molecular configurations that target weed physiological pathways while sparing crop plants, enabling selective weed control in sensitive crops like rice, soybean, and sugar beet through localized chemical specificity
Data Source
AI summary
Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof, (I) wherein A, R1, R2 and R3 are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention.