HERBICIDAL AMIDE AND ESTER DERIVATIVES OF PYRIDINE, PROCESS FOR THEIR PREPARATION AND THEIR APPLICATION

摘要

Selective herbicides based on compounds of the formula: (I) in which: R1, R2 and R3 are H, lower alkyl, alkoxy or alkoxyalkyl; R4 is a carboxyl radical, optionally in the form of a salt or ester, or a cyano, cyanoalkyl or alkoxyalkyl radical; R5 and R6 are H, lower alkyl or cyano or together form a C2 to C5 alkylene radical; R7 is halogen, lower alkyl, lower alkoxy, lower alkenyl, alkenyloxy, nitro, cyano or amino, alkylene-dioxy; n=0 to 5; and is a nitrogen-containing heterocyclic ring containing 2 or 3 units of unsaturation.