New 2-phenyl-4,5,6,7-tetrahydro-2H-indazole derivatives as paddy field herbicides |
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| Authors: | Hwang In Taek Kim Hyoung Rae Jeon Dong Ju Hong Kyung Sik Song Jong Hwan Chung Chang Kook Cho Kwang Yun |
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| Institution: | Korea Research Institute of Chemical Technology, Bioorganic Science Division, Yusung, Taejon 305-606, Korea. ithwang@krict.re.kr |
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| Abstract: | A series of 3-chloro-2-(4-chloro-2-fluorophenyl)-4,5,6,7-tetrahydro-2H-indazole derivatives containing various substituted isoxazolinylmethoxy groups at the 5-position of the benzene ring were synthesized and their herbicidal activities assessed under greenhouse and flooded paddy conditions. Among them, compounds having a phenyl or cyano substituent at the 3-position of the 5-methyl-isoxazolin-5-yl structure demonstrated good rice selectivity and potent herbicidal activity against annual weeds at 16-63 g AI ha(-1) under greenhouse conditions. Field trials indicated that these two compounds controlled a wide range of annual weeds rapidly with a good tolerance on transplanted rice seedlings by pre-emergence application. They showed a low mammalian and environmental toxicity in various toxicological tests. |
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| Keywords: | isoxazoline 2‐phenyl‐4 5 6 7‐tetrahydro‐2H‐indazole transplanted rice herbicide |
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