| 摘要 |
NEW MATERIAL:The compound of formula I (R is loser alkyl). EXAMPLE:N,N-dimethyl-N'-methoxycarbonyl-N'-3,4-dichlorophenylu-rea. USE:Herbicide having high herbicidal activity against harmful weeds in plowed land, such as large crab-grass, common purslane, cockspur grass, smooth pigweed, umbrella sedge, cleavers, etc. PREPARATION:The compound of formula I can be prepared by reacting the compound of formula II with dimethylcarbamyl chloride of formula III in a solvent such as acetone, tetrahydrofuran, etc. in the presence of a base (e.g. sodium hydride, n-butyl lithium, etc.) at a temperature between room temperature and the refluxing temperature, for 5-48hr.
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