2-(poly-substituted aryl)-6-amino-5-halo-4-pyrimidinecarboxylic acids and their use as herbicides
View Patent ↗6-Amino-5-halo-4-pyrimidinecarboxylic acids having poly-substituted aryl substituents in the 2-position, and their amine and acid derivatives, are potent herbicides demonstrating a broad spectrum of weed control.
1. A compound of the formula I
wherein
Q represents a halogen;
R 1 and R 2 independently represent H, C 1 -C 6 alkyl, C 3 -C 6 alkenyl, C 3 -C 6 alkynyl, hydroxy, C 1 -C 6 alkoxy, amino, C 1 -C 6 acyl, C 1 -C 6 carboalkoxy, C 1 -C 6 alkylcarbamyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 trialkylsilyl or C 1 -C 6 dialkyl phosphonyl or R 1 and R 2 taken together with N represent a 5- or 6-membered saturated ring; and
X represents halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, C 1 -C 4 alkylthio, C 1 -C 4 haloalkylthio or —NR 3 R 4 ;
R 3 and R 4 independently represent H or C 1 -C 4 alkyl; and
agriculturally acceptable derivatives of the carboxylic acid.