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KMID : 0903519940370060516
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1994 Volume.37 No. 6 p.516 ~ p.521
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Influence of 3 -(N - methyl - N - X(Sub .) Phenylaminooxoacetyl) Group on the Herbicidal Activity of Imazapyr Derivatives
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Abstract
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New seventeen imazapyr derivatives, 2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-3-(N-methyl-N-X(sub.)-phenylaminooxoacetyl)pyridine, 6 were synthesized and their pre-emergence herbicidal activity(pI_(50) in vivo against Corn (Zea mays L.) and Pigweed (Amaranthus viridis L.) were studied by the pot test under paddly conditions. (quantitative structure activity relationships (QSARs) were analyzed using the physicochemical parameters of substituent(X) on the phenyl ring of 3-(N-methyl-N-X(sub.)-phenylaminooxoacetyl) group and regression analysis. The herbicidal activities were related to the steric effect of X-substituent. The effect was rationalized by paraholic function of MR and L₁, where the optimal values were MR=5.56 (Zea mays L.) and L₁=3.34 Å (Amaranthus viridis L.). Among them, 2,5-difluoro substituted compound, 6i showed good herbicidal activity against Pigweed with excellent tolerance to Corn.
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