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Twenty one esters of trans β-(2,4-dichlorophenoxy)acrylic acid were prepared and their inhibitory activity against shoot elongation in the rice plant and barnyard-grass was measured. The relationship between herbicidal activity and chemical structure was analysed using the Hansch approach. The selectivity (activity against barnyard-grass/activity against the rice plant) was mainly due to the lipophilic property of the esters between the two plant species.

agricultural and biological chemistry

Relationship between Chemical Structure and Selectivity in Herbicidal Activity of trans-β-(2, 4-Dichlorophenoxy)-acrylates against Rice Plant and Barnyard-grass