New substituted pyrazolylpyrazoles, processes for their preparation, as well as intermediates, and their use as herbicides

Abstract From the Canadian patent

Disclosed are substituted pyrazolylpyrazoles of general formula I, in which, R1 is C1-C4-alkyl optionally substituted by one or more, halogen atoms; R2 hydrogen, or a C1-C4-alkyl, C1-C4-alkylthio C1-C4-alkoxy, each of which is optionally substituted by one or more halogen atoms, or, R1 and R2 together form the group -(CH2)n-Xwhere X is, bound at R2;, R3 is hydrogen or halogen R4 is hydrogen or C1-C4-alkyl, R5 is hydrogen nitro, cyano or the group -COOR6 or, -CONR7R8 R6 is hydrogen, C1-C6-alkyl, C2-C6-alkenyl or C2-C6-alkynyl; R7 and R8 independently of each other are hydrogen or C1-C6-alkyl or, R7 and R8 together with the nitrogen to which they are attached form a morpholino, piperidino or …