Compounds of the formula ##STR1## wherein X is O or NR.sup.3 in which R.sup.3 is hydrogen or alkyl; X.sup.1 is oxygen or sulfur; Y is hydrogen, halogen, cyano, alkyl, alkoxy, haloalkoxy, alkylthio or haloalkyl; Z is hydrogen, halogen, alkyl, alkoxy or haloalkyl; and R.sup.1 and R.sup.2 each independently may be hydrogen, alkyl, aryl or aralkyl and R is hydrogen or methyl are useful as herbicides.
式子为##STR1##的化合物中,其中X为O或NR.sup.3,其中R.sup.3为氢或烷基;X.sup.1为氧或
硫;Y为氢、卤素、
氰基、烷基、烷氧基、卤代烷氧基、烷
硫基或卤代烷基;Z为氢、卤素、烷基、烷氧基或卤代烷基;R.sup.1和R.sup.2各自可以是氢、烷基、芳基或芳烷基,而R为氢或甲基,这些化合物可用作
除草剂。