| 摘要 |
NEW MATERIAL:The compound of formula I (R is lower alkyl, lower alkenyl or lower alkynyl; R' is lower alkylene). EXAMPLE:N-(2-Fluoro-4-chloro-5-propargyloxyphenylcarbamoyl)pyrrolidine. USE:Herbicide exhibiting excellent activity against broad-leaved weeds, gramineous weeds, paddy field weeds, etc., and useful for the control of various weeds in plowed land, paddy field, orchard, pasture, lawn, forestry, unplowed land, etc. PROCESS:The compound of formula I can be prepared by reacting the 3-hydroxy- phenylurea derivative of formula II with the halide of formula R-X (X is halogen) in a solvent such as benzene, dioxane, etc., preferably in the presence of a dehydrohalogenation agent (e.g. sodium hydroxide, triethylamine, etc.), at 0- 150 deg.C. |
