Postemergent activity structure

Herbicidal Activity. The subject furanones are primarily active as preemergence and preplant incorporated (PRE/PPI) materials and are moderately active when applied postemergence. The structure-activity relationships discussed below pertain to the preemergence activity. 

The phenoxynicotinamides represent a novel class of promising preemergence and postemergence herbicides. The results obtained to date indicate that relatively minor variations in structure can have a significant effect on the level of herbicidal activity and spectrum of weeds controlled. 

Pinoxaden, Axial , Adigor , Cloquintocet-mexyl, Discovery, Structure-Activity Relationship, Herbicide, Grass Weed Control, Graminicide, Postemergence, Cereals, Wheat, Barley... 

Cross, B., Hoffman, P. P., Santora, G. T., Spatz, D. M. and Templeton, A. R. (1983) The design of postemergence phenylurea herbicides using physicochemical parameters and structure-activity analyses. J. Agric. Food Chem., 31, 260-4. 

The hydroxyoxazolidinones 1 and the hydroxypyrrolidinones 2 were active as postemergence, preemergence and preplant incorporated materials. The structure activity relationships are discussed below. Three aspects of these molecules were altered in order to maximize herbicidal activity. These are 1) the substituent on the ring nitrogen 2) the substituents on either the oxazolidinone or pyrrolidinone rings and 3) the hydroxyl substituent. 

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