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Abstract
Many phenoxypyridines were prepared and their herbicidal activities studied. Most 3- and 4-phenoxypyridines showed no remarkable herbicidal effects. Some 2-phenoxypyridines, however, exhibited high potentials as useful herbicides. 2-(4-Nitrophenoxy)-3,5-dichloropyridine showed particularly promising herbicidal activity. On comparing the activity and structure of the 2-phenoxypyridines with those of the corresponding diphenyl-ethers, the 2-pyridoxy group was nearly equivalent physiologically to the phenoxy group.