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Synthesis and Herbicidal Activity of Cyclohexane-1,3-diones
Kyoung-Mahn Kim(김경만),Byung Hoe Lee(이병회),Eung Kul Ryu(유응걸) 한국농약과학회 2000 농약과학회지 Vol.4 No.3
A series of S-(2-methyl-2-alkylindanyl)cyclohexane-1,3-diones were synthesized and evaluated for herbicidal activities in a green house. Under submerged paddy conditions, those compounds showed high herbicidal activity against barnyardgrass with good tolerance on rice.
Synthesis and Herbicidal Activity of N-{2,4-dichloro-5-(3-pyrazolyl)phenyl} imides
Kyoung-Mahn Kim(김경만),Byung Hoe Lee(이병회),Eung Kul Ryu(유응걸) 한국농약과학회 2000 농약과학회지 Vol.4 No.3
A series of N-{2,4-dichloro-5-(pyrazolyl)phenyl}imides 7 and 8 was prepared and evaluated their herbicidal activities. Those compounds in which either carboxylate or carboxamide moiety is on pyrazole moiety 7c-7l showed no herbicidal activity whereas, the compounds in which trifluoromethyl group is substituted in pyrazolyl moiety showed moderate herbicidal activities against barnyardgrass, monochria and flat-sedge under paddy conditions with good rice tolerance at rate 63-250 g/㏊
Synthesis and Herbicidal Activity of New N-{5-[(Pyrazolylmethyl)oxy]phenyl}imides
Kyoung-Mahn Kim(김경만),Jong Hwan Song(송종환),Dong Ju Jeon(전동주),Hyoung Rae Kim(김형래),Jung Sup Choi(최정섭),Do-Yeon Oh(오도연),Eung K. Ryu(유응걸) 한국농약과학회 2000 농약과학회지 Vol.4 No.2
3,4-Dimethyl-N-[4-chloro-2-fluoro-5-{(pyrazolylmethyl)oxy}phenyl]maleimides or 3,4,5,6-tetrahydro-N-[4-chloro-2-fluoro-5-{(pyrazolylmethyl)oxy} phenyl]phthalimides were prepared and evaluated their herbicidal activities under paddy conditions. Those compounds which have N-methyl-5-pyrazolylmethyloxy moiety showed good tolerance in transplanted rice and strong herbicidal activities on bamyardgrass below 60 g/㏊ of dose.
성낙도(Nack-Do Sung),송종환(Jong-Hwan Song),김경만(Kyoung-Mahn Kim) 한국농약과학회 2000 농약과학회지 Vol.4 No.3
A new fifteen 2,3-dihydro-2-ethyl-2,4,6,7-tetramethylbenzofuran-5-yl substituents in 5-benzofury-2-[1-(alkoxyimino)alkyl]-3-hydroxycyclohex-2-en-1-one derivatives as substrate were synthesized and their herbicidal activities against rice plant (Onjza sativa L.) and barnyard grass (Echinochloa crus-galli) with post emergence were measured under submerged conditions. The R₁=methyl substituents, 1~8 showed the. higher herbicidal activity to the rice plant and barnyard grass. The structure-activity relationships (SARs) on the herbicidal activity of R₁ and OR₂ groups on the azomethine bond in substrates were analysized. From the results of dicussed SAR, the herbicide activities against rice plant would depend largely on the steric factor. Whereas, in case of barnyard grass, the activities were governed by the hydrophobicity factor. The conditions of selective herbicide activity between the two plant species are assumed that the substrates should have optimal hydrophobicity ((logP)<SUB>opt.</SUB>=6.0), a R₁ groups of small and a long OR₂ groups.