Pyridazinone derivatives, process for their preparation, compositions containing them and their use as pesticides

摘要

Compounds of the formula I <IMAGE> in which R1 denotes hydrogen or (C1-C6)-alkyl, optionally substituted by halogen or a hydroxyl group, R2 denotes hydrogen, (C1-C6)-alkyl, or halogen, X denotes oxygen or sulphur and R3 denotes (C1-C20)-alkyl, which can be mono- or polysubstituted by hydroxyl, halogen, amino, (di)-(C1-C4)-alkylamino, (C1-C4)-alkoxy, (C1-C4)-haloalkoxy, (C1-C4)-alkoxy-(C1-C4)-alkyleneoxy, (C1-C4)-alkylthio which can be substituted by (C1-C3)-alkyl, halogen or (C1-C3)-haloalkyl, or can be substituted by (C1-C4)-alkylsulphinyl, (C1-C4)-alkylsulphonyl, trimethoxysilyl, amidocarbonyl, (C1-C4)-alkylsulphonyloxy, (C1-C6)-alkylcarbonyl, (C1-C6)-alkoxycarbonyl, (C1-C6)-alkylcarbonyloxy, cyano, thiocyano, (C3-C8)-cycloalkyl, which can be substituted by hydroxyl or (C1-C4)-alkylcarbonyloxy, aryl, aryloxy, arylthio, arylsulphinyl, arylsulphonyl, arylsulphonyloxy or arylcarbonyl, all of which can be substituted by (C1-C4)-alkyl, (C1-C4)-alkoxy or halogen, with the proviso that if the (C1-C20)-alkyl radical is substituted by substituted or unsubstituted aryl or aryloxy, hydroxyl additionally substitutes this alkylene moiety, have advantageous insecticidal, acaricidal, nematocidal or fungicidal properties.