| 摘要 |
1,4-Diphenyl-3-pyrazolin-5-ones of the formula I <IMAGE> in which R represents C1-C3-alkyl and R<1> and R<2> independently of one another denote hydrogen, chlorine, fluorine, bromine, methyl or trifluoromethyl, with the proviso that the substituents R<1> and R<2> do not simultaneously represent hydrogen and that the substituent R<1> furthermore does not denote bromine or chlorine in the 4-position, are obtained by reacting a suitable 3-pyrazolin-5-one with an alkylating agent. These compounds which have been prepared according to the invention are used as herbicidal active substances. |
