Herbicidal 2-(hectero)aryloxy-6-arypyridines and 2-aryl-4-(hetero)aryloxypyrimidines

摘要

New herbicidal pyridine and pyrimidine derivatives of general formula (I), <IMAGE> (I) wherein Z represents a nitrogen atom or a C-H group; A represents an optionally substituted aryl group or an optionally substituted 5- or 6-membered nitrogen-containing heteroaromatic group; n represents an integer from 0 to 2 and R1 or each R1 independently represents a hydrogen atom or an optionally substituted alkyl, alkoxy, alkylthio or dialkylamino group; m represents an integer from 0 to 5 and R2 or each R2 independently represents a hydrogen or a halogen atom or an optionally substituted alkyl, haloalkyl, haloalkoxy, alkoxy, alkylthio group or a nitro, cyano or a halosulphonyl group; and X represents an oxygen or sulphur atom.