Pyridazin-4-ylmethyl-sulfonamides used as Fungicides and Against Arthropods

A compound of formula (I)

• wherein:
• n is zero, one, two or three;
• R1 is halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4 alkylthio, C1-C4-haloalkylthio, C1-C4-alkylsulfinyl, C1-C4-haloalkylsulfinyl, C1-C4-alkylsulfonyl, C1-C4-haloalkylsulfonyl, amino, C1-C4-alkylamino, di(C1-C4-alkyl)amino, C1-C4-alkoxy-C1-C4-alkyl, C1-C4-haloalkoxy-C1-C4-alkyl, C2-C4-alkenyl, C2-C4-alkynyl, C3-C8-cycloalkyl or C1-C4-alkyl-C3-C8-cycloalkyl;
• and/or
• one radical R1 that is bound to a carbon atom adjacent to a nitrogen atom of the pyridazine ring may form together with said carbon atom and nitrogen atom a fused five-membered aromatic heterocycle, which may contain one, two or three further nitrogen atoms as ring members;
• or
• two radicals R1 that are bound to adjacent carbon atoms of the pyridazine ring may form together with said carbon atoms a fused benzene ring, a fused saturated or partially unsaturated 5-, 6-, or 7-membered carbocycle or a fused 5-, 6-, or 7-membered heterocycle containing one, two or three heteroatoms selected from the group consisting of 2 nitrogen, 1 oxygen and 1 sulfur atoms as ring members, it being possible for the fused ring to carry one or two radicals selected from the group consisting of halogen, C1-C4-alkyl, halomethyl, C1-C4-alkoxy and halomethoxy;
• R2 is hydrogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylamino, di(C1-C4-alkyl)amino, C1-C4-alkoxy-C1-C4-alkyl, C1-C4-haloalkoxy-C1-C4-alkyl, C2-C4-alkenyl, C2-C4-haloalkenyl, C2-C4-alkynyl, C3-C8-cycloalkyl, C1-C4-alkyl-C3-C8-cycloalkyl or benzyl wherein the phenyl moiety of benzyl is unsubstituted or carries 1, 2, 3, 4, or 5 substituents selected from the group consisting of cyano, halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, (C1-C4-alkoxy)carbonyl and di(C1-C4-alkyl)aminocarbonyl;
• A is phenylene, 5- or 6-membered heteroarenediyl, where heteroarenediyl contains one, two, three or four heteroatoms selected from the group consisting of 1, 2, 3 or 4 nitrogen atoms, 1 oxygen atom and 1 sulfur atom, as ring members, and where phenylene and heteroarenediyl for their part are unsubstituted or carry 1, 2, 3 or 4 substituents RA, each selected from the group consisting of cyano, halogen, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C2-C4-alkenyl, C2-C4-haloalkenyl, C2-C4-alkynyl, C2-C4-haloalkynyl, (C1-C4-alkoxy)carbonyl and di(C1-C4-alkyl)aminocarbonyl, or
• A is C1-C8-alkanediyl, C1-C8-haloalkanediyl, C2-C8-alkenediyl, C2-C8-haloalkenediyl, C2-C8-alkynediyl, or C2-C8-haloalkynediyl, wherein the six last-mentioned radicals are unsubstituted or carry one, two or three substituents RAA, each selected from the group consisting of cyano, C1-C4-alkoxy, C1-C4-haloalkoxy, (C1-C4-alkoxy)carbonyl and di(C1-C4-alkyl)aminocarbonyl;
• R3 is hydrogen, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-haloalkylthio, C1-C4-alkylamino, di(C1-C4-alkyl)amino, (C1-C4-alkyl)carbonyl, (C1-C4-alkoxy)iminomethyl, acryloyl(vinylcarbonyl), C3-C8-cycloalkyl, C1-C4-alkyl-C3-C8-cycloalkyl, or C5-C8-cycloalkenyl,
• phenyl, benzyl, phenoxy, phenylthio, a 5- or 6-membered heteroaryl radical, wherein the heteroaryl ring has 1, 2, 3 or 4 heteroatoms selected from the group consisting of 1, 2, 3 or 4 nitrogen atoms, 1 oxygen atom and 1 sulfur atom, as ring members, it being possible for the heteroaryl ring and the phenyl ring of phenyl, benzyl, phenoxy and phenylthio to be unsubstituted or substituted by one, two or three substituents RB, each selected from the group consisting of cyano, nitro, amino, halogen, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, (C1-C4-alkoxy)carbonyl, di(C1-C4-alkyl)aminocarbonyl, C1-C4-alkylsulfinyl and C1-C4-alkylsulfonyl;
• or
• a 5- or 6-membered heteroaryloxy radical or a 5- or 6-membered heteroarylthio radical, wherein the heteroaryl ring in the two aforementioned radicals has 1, 2, 3 or 4 heteroatoms selected from the group consisting of 1, 2, 3, or 4 nitrogen atoms, 1 oxygen atom and 1 sulfur atom, as ring members, it being possible for said heteroaromatic ring to carry one, two or three substituents RB;
• or if A is phenylene or 5- or 6-membered heteroarenediyl, the radical R3 together with a radical RA may form together with the carbon atoms to which they are bound a fused benzene ring, wherein the fused benzene ring may be unsubstituted or may carry 1, 2 or 3 substituents selected, independently from one another, from the group consisting of halogen, cyano, nitro, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, (C1-C4-alkoxy)carbonyl and di(C1-C4-alkyl)aminocarbonyl, or
• if A is phenylene or 5- or 6-membered heteroarenediyl, the radical R3 can also be C1-C4-alkyl, C2-C4-alkenyl or C2-C4-alkynyl;
• and the N-oxides, the agriculturally acceptable salts and the veterinarily acceptable salts of the compounds of the formula (I), except for the compound N-(3,6-dichloro-pyridazin-4-ylmethyl)-4-methylbenzenesulfonamide.