• Title, Summary, Keyword: 광학활성 우레아

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Safening Activity of Optically Active ${\alpha}$-Methylbenzylphenylurea toward Bensulfuron-methyl and Pyribenzoxim Injury to Rice (광학활성 ${\alpha}$-Methylbenzylphenylurea 유도체의 bensulfuron-methyl과 pyribenzoxim의 벼에 대한 약해경감효과)

  • Ryoo, Jae-Hwan
    • The Korean Journal of Pesticide Science
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    • v.9 no.2
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    • pp.153-158
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    • 2005
  • Safening activities of optically active ${\alpha}$-methylbenzylphenylureas on crop injury of rice (Oryza sativa L., cv. Tsukinohikari, japonica) caused by bensulfuron-methyl (methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate) and pyribenzoxim (benzophenone o-[2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoyl]oxime) were investigated. Some derivatives of the optically active compounds exhibited strong safening activity against growth inhibition of rice by bensulfuron-methyl. Out of the derivatives tested, (S)-2,3-diCl and (S)-2-F-4-Me derivatives showed greater relieving activity than that of dymuron. In addition, the stress relieving activity was also obtained when they were applied at 4 days after bensulfuron-methyl treatment. On the other hand, crop injury caused by pyribenzoxim was relieved by about 95% with (S)-2-F-4-Me derivative in shoots and roots of rice seedlings.

Facile synthesis of optical pure fenoxaprop-p-ethyl[ethyl (R)-2-{4-(chloro-1,3-benzoxazol-2-yloxy)phenoxy}propionate] (광학활성 제초제 fenoxaprop-p-ethyl [ethyl (R)-2-{4-(6-chloro-1,3-benzoxazol-2-yloxy)phenoxy}propionate]의 새로운 합성법)

  • Ryu, Sung-Kon;Ko, Young-Kwan;Chang, Hae-Sung;Ryu, Jae-Wook;Woo, Jae-Chun;Koo, Dong-Wan;Kim, Dae-Whang;Chung, Kun-Hoe
    • The Korean Journal of Pesticide Science
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    • v.8 no.1
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    • pp.1-7
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    • 2004
  • Fenoxaprop-p-ethyl[Ethyl (R)-2-{4-(6-chloro-1,3-benzoxazol-2-yloxy)phenoxy}propionate] is well known as a herbicide for its specific activity against the weed grasses. This compound was synthesized by the reaction of 4-(6-chloro-1,3-benzoxazol-2-yloxy)phenol and ethyl (S)-O-(p-toluenesulfonyl)lactate in good yields with high optical pure(optical purity: 99.9% up). In this process Walden inversion occurs, whereby the S-configuration of the propionic acid derivative is converted to the R-configuration of the final product. 4-(6-Chloro-l,3-benzoxazol-2-yloxy)phenol was obtained by 5 step reactions in over-all 70% yields using inexpensive raw materials.