Herbicidal compounds.

摘要

Compounds of formula I <CHEM> wherein A is nitrogen or a group CR<5>; each of R<1>, R<2> and R<5> is, independently, hydrogen, halogen, formyl, cyano, carboxy, azido or optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkylthio, alkenylthio, alkynylthio, arylthio, alkylcarbonyl, alkoxycarbonyl, amino, aminoxy or dialkyliminoxy; and R is <CHEM> in which R<3> is hydrogen, optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclic or aryl, or COR<8>, R<8> being hydroxy, alkoxy, carboxy, alkoxycarbonyl, amino or mono- or di- alkylamino; and R<4> is a group COR<6> wherein R<6> is hydrogen, halogen, hydroxy, or optionally substituted alkoxy, alkenyloxy, alkynyloxy, cycloalkoxy, aryloxy, alkylthio, alkenylthio, alkynylthio, arylthio, aminoxy, dialkyliminoxy or amino, or R<6> is a group OR<7> in which R<7> is an optionally substituted heterocyclic ring; or <CHEM> each of R<9> and R<1><0> being, independently, hydrogen or alkyl; or a carboxylic acid salt of a compound with an equivalent amount of an inorganic or organic cation; have herbicidal properties. The invention also provides processes for their preparation and their use as herbicides.