• Title/Summary/Keyword: 2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-3-N-methyl-N-X(sub.-)phenylaminooxoacetyl-5-mothyl pyridines

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Influence of 3-(N-methyl-N-X(sub.)phenylaminooxoacetyl) group on the herbicidal activity of Imazethapyr derivatives (Imazethapyr 유도체의 제초활성에 미치는 3-(N-methyl-N-(X)-치환-phenylaminooxoacetyl) group의 영향)

  • Sung, N.D.;Kim, H.J.;Chang, H.S.;Kim, D.W.
    • Applied Biological Chemistry
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    • v.36 no.5
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    • pp.381-386
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    • 1993

  • New twenty five Imazethapyr derivatives, [2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin -2-yl)-3-(N-methyl-N-X(sub.)-phenylaminooxoacetyl)-5-methylpyridine] were synthesized. and The quantitative structure activity relationships (QSARs) between their post-emergence herbicidal activity$(pI_{50})$ values in vivo against Barnyard grass (Echinochloa crus-galli) and physicochemical parameters of substituents(X) of 3-(N-methyl-N-X(sub.)-phenylaminooxoacetyl) group have been studied. From the basis on the findings, in case of post-emergence, the activities were dependent on the steric constant$(E_s<0)$ and electron donating $(\sigma<0)$ effect by subsitituents(X) of 3-(N-methyl-N-X(sub.)phenylaminooxoacetyl) group. Therefore, The most effective compound,15 (4-t-butyl group) and 20 (3,5-dimethyl group) were examined in this study. And the conditions on the compounds predicted to show higher herbicidal activity were also discussed.

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