| 摘要 |
NEW MATERIAL:A substituted phenylcarbamate shown by the formulaI(X is O, S or vinylene; l and m are 1-4; n is 0 or 1; the number of heterocyclic ring formed by N atom, two alkylene groups and X is 5-7, and two alkylene groups may be branched; Y is halogen; Z is H or halogen; R is alkyl, alkenyl, or alkyl). EXAMPLE:4-Chloro-3-methoxyphenyl 1-pyrrolidinecarboxylate. USE:A herbicide. Showing high herbicidal effect on various kinds of weeds. Having excellent controlling effect especially on annual broadleaf weeds, annual gramineous and cyperaceous weeds, having no phytotoxicity to useful crops. Especialy exhibiting the maximum effect during the germination of weeds in a plowed field. PROCESS:For example, a compound shown by the formula II is reacted with phosgene in the presence of a base to give a compound shown by the formula III, which is reacted with a compound shown by the formula IV in the presence of a base, to give a compound shown by the formulaI. |
