| abstract |
Compounds having the formula <IMAGE> wherein R is C1-C6 lower alkoxy; C1-C6 lower alkylthio; 3- to 6-membered heterocycle or substituted heterocycle; phenyl or substituted phenyl; R1 is hydrogen or C1-C3 lower alkyl; R2 is selected from the group consisting of hydrogen, C1-C3 lower alkyl, C3-C6 cycloalkyl, C1-C3 lower alkylalkoxy or combinations thereof; R3 and R4 are independently selected from the group consisting of hydrogen; C1-C6 lower alkyl; C2-C6 lower alkenyl; C2-C6 lower alkynyl; 3- to 6-membered heterocyle or substituted heterocycle; alkyl heterocycle or substituted alkyl heterocycle; phenyl or substituted phenyl; and where R3 l or R4 is a basic heterocyle, herbicidally acceptable organic or inorganic salts thereof are herbicidally active. |