JP2909469B

Novel benzo-1,2,3-thiadiazole-7-carboxylic acid esters of the formula in which the substituents have the following meanings: Y represents oxygen or sulphur; Q1 and Q2 independently of one another represent hydrogen or halogen; R1 and R2 independently of one another represent hydrogen or C1-C4-alkyl; X1 represents hydrogen, halogen, C1-C4-alkyl, trifluoromethyl, C1-C3-alkyl, C1-C2-alkoxy which is substituted in the alkyl moiety by halogen, or represents nitro, cyano, dimethylamino, phenyl, phenoxy, or represents phenyl or phenoxy, each of which is substituted by halogen and/or C1-C2-alkyl and/or C1-C2-alkoxy; X2 represents hydrogen, halogen or methyl; X3 represents hydrogen or halogen; and A represents the bridge members carbonyl, ethenylene or ethynylene; where R3 represents C1-C6-alkyl, C3-C6-alkenyl, hydroxy, C1-C6-alkoxy, O-C(O)-C1-C4-alkyl, carboxyl, COOC1-C4-alkyl, cyano or hydrogen, with the proviso that, in the event that R3 denotes hydrogen, R1, R2 or R4 is not simultaneously hydrogen; R4 represents C1-C6-alkyl, C1-C6-alkoxy or hydrogen, with the proviso that, in the event that R4 denotes hydrogen, R1, R2 or R3 is not simultaneously hydrogen; R5 represents C1-C6-alkyl, C1-C6-cycloalkyl, C1-C6-alkoxy, phenyl, or represents phenyl which is substituted by halogen or methoxy; R6 reprsents C1-C6-alkyl or C1-C6-alkoxy; or furthermore represents the bridge member which in conjunction also represents a saturated or unsaturated 3-7-membered carbocycle W1 or a saturated or unsaturated 5-7-membered heterocycle W2 having 1 or 2 hetero atoms which denote either oxygen, sulphur or nitrogen; or the bridge member which in conjunction denotes a saturated or unsaturated 3- to 7-membered heterocycle W3 having not more than 2 oxygen or sulphur atoms as further hetero atoms. The novel active substances have plant-protecting properties and are suitable, in particular, for the preventive protection of plants against the attack of phytopathogenic microorganisms such as fungi, bacteria and viruses.