-pyrid - n - oxide substituted salicylaldehyde - or salicylic acid derivatives, processes for their preparation and their use as herbicides

摘要

pyridine n oxide substituted salicylaldehyd and salicylsu00e4urederivate of general formula i, r $f1 in a formylgruppe, a group of co2h or to co2h hydrolysierbaren rest means, and the other substituents have the meaning: $a r2 is halogen, alkyl, halogenalkyl, alkoxy, hal ogenalkoxy or alkylthio; $a x is nitrogen or cr13,with hydrogen or halogen is r13 or together with r3, a 3 - to 4gliedrige alkylen or alkenylenkette is, in one methylengruppe is replaced by oxygen; $a r3 halogen, alkyl, halogenalkyl, alkoxy, halogenalkoxy, alkylthio, or r3 is r13 as indicated above, z u a 5 - or 6gliedrigen ring connected; $a and oxygen or sulfur; $a r14 - r17 a.alkylsubstituierte cycloalkylgruppe;. substituted alkylgruppe;. substituted alkoxy or alkylthiogruppe; a dialkylamino or a dialkylaminoxygruppe;. substituted alkenyl or alkinylgruppe, hydrogen, halogen, nitro or cyano.