Substituted N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compounds, such as N-(2,6-difluorophenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2- sulfonamide, N-(4-bromo-1-methyl-3-pyrazolyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]p yridine-2-sulfonamide, and N-(2-fluoro-4-methyl-3-pyridinyl)-8-ethoxy-6-chloro[1,2,4]triazolo[1,5-a]p yridine-2-sulfonamide, were prepared by condensation of a 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine compound with an aryl amine. The compounds prepared were found to possess excellent herbicidal activity on a broad spectrum of vegetation at low application rates.
This is a divisional of application Ser. No. 08/466,510 filed Jun. 6, 1995 U.S. Pat. No. 5,571,775 which is a continuation-in-part of application Ser. No. 08/273,519 filed on Jul. 11, 1994, abandoned.
The invention concerns novel substituted triazoloazine sulphonamides of formula (I) ##STR1## in which Q.sup.1 stands for nitrogen or a CH group: Q.sup.2 stands for nitrogen or a CH group; R.sup.1 stands for hydrogen or halogen, or for C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 alkylamino or di(C.sub.1 -C.sub.4 alkyl)amino, in each case optionally substituted by hydroxy, halogen or C.sub.1 -C.sub.4 alkoxy; R.sup.2 stands for hydrogen or halogen, or for C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 alkylamino or di(C.sub.1 -C.sub.4 alkyl)amino, in each case optionally substituted by halogen; and Ar stands for 4-cyano-2,5-difluoro-phenyl, 2,6-dimethoxy-phenyl, 2-bromo-3-trifluoro-methyl-phenyl, 2-bromo-5-trifluoromethyl-phenyl, 6-chloro-pyridine-3-yl-methyl or one of the 5- or 6-member (hetero)cyclic groups mentioned in the description. The invention also concerns salts of these substances, a process for preparing the novel compounds, and their use as plant-treatment agents.
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