• Title, Summary, Keyword: 2,3-dihydro-2-ethyl-2,4,6,7-tetra-methylbenzofuran-5-yl substituent

Search Result 1, Processing Time 0.03 seconds

Structure-activity relationships on the herbicidal activity of the 2,3-dihydro-2-ethyl-2,4,6,7-tetramethylbenzofuran-5-yl substituents in 5-benzofuryl-2-[1-(alkoxyimino)alkyl]-3-hydroxycyclohex-2-en-1-one derivatives (5-Benzofuryl-2-[1-(alkoxyimino)alkyl]-3-hydroxycyclohex-2-en-1-one 유도체 중 2,3-dihydro-2-ethyl-2,4,6,7-tetramethylbenzofuran-5-yl 치환체들의 제초활성에 관한 구조-활성관계)

  • Sung, Nack-Do;Song, Jong-Hwan;Kim, Kyoung-Mahn
    • The Korean Journal of Pesticide Science
    • /
    • v.4 no.3
    • /
    • pp.34-39
    • /
    • 2000
  • A new fifteen 2,3-dihydro-2-ethyl-2,4,6,7-tetramethylbenzofuran-5-yl substituents in 5-benzofuryl-2-[1-(alkoxyimino)alkyl]-3-hydroxycyclohex-2-en-1-one derivatives as substrate were synthesized and their herbicidal activities against rice plant (Oryza sativa L.) and barnyard grass (Echinochloa crus-galli) with post emergence were measured under submerged conditions. The $R_{1}$=methyl substituents, $1{\sim}8$ showed the higher herbicidal activity to the rice plant and barnyard grass. The structure-activity relationships (SARs) on tile herbicidal activity of $R_{1}$ and $OR_{2}$ groups on the azomethine bond in substrates were analysized. From tile 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 nave optimal hydrophobicity ( $(logP)_{opt.}=6.0$), a $R_{1}$ groups of small and a long $OR_{2}$ groups.

  • PDF