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성낙도(Nack-Do Sung),임치환(Chi-Whan Lim),윤기섭(Ki-Seob Yun),송종환(Chong-Whan Song),김형래(Hung-Rae Kim) 한국농약과학회 2000 농약과학회지 Vol.4 No.2
A series of synthesized N-(2-fluoro-4-chloro-5-alkyloxyphenyl)-3,4-dimethyl-2-arylthio-5-oxo-2,5-dihydropyrrole derivatives as substrates were found to selectivity significantly with both rice plant (Oryzasativa L.) and weeds, barnyard grass (Echinochloa crus-galli) and bulrush (Scriptus juncoides) for those herbicidal activities at a rate of 0.1 ㎏/㏊ with post emergence under submerged conditions. The structure activity relationships(SARs) on herbicidal activity of SR₂=2-arylthio substituents on the pyrrole ring were analysized. From the results, the relative contribute orders of the SR₂ with phenyl group on the activity are meta> para> ortho-substituents. Among these compounds, the R₁=propargyl(IA) substituents, 1~12 showed higher activity than the R₁=2-chloro-2-propenyl(IB) substituents, 13-16. The SR₂ groups of IA substituents shown that the optimal steric constant, (Es)<SUB>opt.</SUB>=3.25 and m-phenylthio substituents were found to be contribute the activity against barnyard grass. But the herbicidal activity of IB substituents against bulrush would depend upon the molar refractivity, M<SUB>R</SUB> constant of SR₂ group.