| 摘要 |
<p>NEW MATERIAL:An isatin derivative of formula I (R is lower alkyl, lower alkenyl, lower alkinyl). EXAMPLE:N-(1-Ethyl-5-fluoroindolin-2,3-dion-6-yl)-3,4,5,6-tetrahydroph thalimide. USE:It is used as a herbicide. It shows excellent herbicidal effect with high selectivity between crop plants and weeds. It can control broad leaf weeds such as pink smartweed, smooth pigweed, rough pigweed; true grasses such as barnyard grass or green foxtail. Further, it shows effects against waterwort, false pimpernel or slender spikerush, which cause troubles in water paddy submerge treatment. It does not damage rice plant, corns and other cereal plants. PREPARATION:The reaction of a compound of formula II with another compound of formula III is carried out in a solvent in the presence of a dehydrohalogenating agent at -10-50 deg.C to give the compound of formula I.</p> |
