| abstract |
1,5-diphenylpyrazole-3-carboxylic acid derivatives of the formula wherein R a and R b are each independently halogen, C₁-C₅-alkyl, C₁-C₅-haloalkyl, C₂-C₅-alkenyl, C₂-C₅-alkynyl or cyano, n is zero or a number 1-3 and OR₁ is hydroxy Plant-physiologically compatible salt or any ester residue, are able to specifically antagonize the phytotoxic effect of phenoxy-propionic acid ester herbicides of the formula II. n n n Hal₁ fluorine, chlorine, bromine, iodine or trifluoromethyl, Hal₂ hydrogen, fluorine, chlorine, bromine or trifluoromethyl, Z for nitrogen or methine (-CH =), X an oxygen or sulfur atom, R₁ halogen, trifluoromethyl, nitro, cyan, C₁- C₄-alkyl or C₁-C₄-alkoxy and n is 0, 1, 2 or 3 and T is an ester, amide, cyanoamide or oxime radical.n n n Agents containing these components as selective herbicides and the use of these two active compounds to control weeds in crops are described, as are new 1,5-diphenylpyrazole-3-carboxylic acid derivatives corresponding to formula I and their preparation. |