Patent ID: 7915200

Claim:
A compound of the formula I wherein X represents H or halogen; Y represents halogen, C 1 -C 4 alkyl or C 1 -C 4 haloalkyl; Z represents H or halogen, with the proviso that at least one of X or Z is halogen and when Z is halogen then X represents H; and 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 agriculturally acceptable derivatives of the carboxylic acid group.