SUBSTITUTED PYRIDYLSALICYLALDEHYDE OR -SALICYLIC ACID DERIVATIVES, THEIR PREPARATION AND THEIR USE AS HERBICIDES

摘要

I Substituted pyridylsalicylaldehyde and -salicylic acid derivatives of the formula I (see formula I) where R is a formyl group, a CO2H group or a radical which can be hydrolyzed to CO2H and the other substituents have the following meanings: R2 is halogen, alkyl, haloalkyl, alkoxy, haloalkoxy or alkylthio; X is nitrogen or CR13, R13 being hydrogen or halogen or together with R3 forming a 3- to 4-membered alkylene or alkenylene chain in which at least one methylene group is replaced by oxygen; R3 is halogen, alkyl, haloalkyl, alkoxy, haloalkoxy or alkyl- thio, or R3 is linked with R13 as indicated above to give a 5- or 6-membered ring; Y is oxygen or sulfur; Py is a substituted pyridine ring, are described.