| abstract |
Compounds of the formula <IMAGE> wherein X is O or NR3 in which R3 is hydrogen or alkyl; X1 is oxygen or sulfur; Y is hydrogen, halogen, cyano, alkyl, alkoxy, haloalkoxy, alkylthio or haloalkyl; Z is hydrogen, halogen, alkyl, alkoxy or haloalkyl; and R1 and R2 each independently may be hydrogen, alkyl, aryl or aralkyl and R is hydrogen or methyl are useful as herbicides. |