2,4-Dichlorophenoxyacetic acid—“2,4-D” to millions of farmers—is one of the most widely used broadleaf herbicides in the world. Its preparation from 2,4-dichlorophenol and chloroacetic acid was ...

For the past few decades, farmers have relied heavily on synthetic herbicides like glyphosate, dicamba, and 2,4-dichlorophenoxyacetic acid to kill weeds. But over time, weeds evolved to tolerate ...

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