Herbicidal Phenyltriazolinones Low Application Rates

The patent applies parameter changes by systematically varying substituents at multiple positions (R1-R7, n, Q, W, X, Y, Z) of the phenyltriazolinone core structure to optimize herbicidal activity. Specific substitutions such as introducing electron-withdrawing groups at R4-R6 positions and modifying the triazolinone ring substituents enhance the compound's binding affinity to target enzymes, thereby increasing herbicidal efficacy at lower application rates.

The patent creates composite molecular structures by combining the phenyltriazolinone core with various aromatic substituents (pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl rings) and diverse functional groups. These composite structures leverage synergistic electronic and steric effects to improve herbicidal activity, allowing effective control of harmful plants at reduced application rates while maintaining crop safety.

The patent applies local quality by introducing specific substituents at particular positions of the phenyltriazolinone molecule that enhance selectivity. For example, substitutions at R1-R3 positions with alkyl, haloalkyl, or hydrogen groups, combined with specific R4-R6 substitutions, create a molecular configuration that preferentially binds to weed target sites while having reduced affinity for crop plant enzymes, thereby improving crop compatibility.

The patent uses the modified phenyltriazolinone compounds as selective intermediaries that exploit metabolic or structural differences between crop plants and harmful plants. The specific substituent patterns act as molecular mediators that allow the herbicide to be activated or bind effectively only in harmful plants, sparing crop plants from damage while maintaining herbicidal efficacy.