Compounds of formula ##STR1## wherein R is halogen, CF.sub.3, NO.sub.2, CN, (C.sub.1 -C.sub.4)alkyl or (C.sub.1 -C.sub.4)-alkoxy, n is zero or 1, X is O, S, NH, or N-(C.sub.1 -C.sub.4)alkyl, Y is O or S, R.sup.1 is H or (C.sub.1 -C.sub.4)alkyl and Z is, among others, a cyanalkyl, (subst.) carbalkoxyalkyl, (subst.) carbalkoxyphenyl, sulfoxyalkyl or oxime group, are selective herbicides active especially against weed grasses.
化合物的公式为##STR1## 其中R是卤素,CF.sub.3,NO.sub.2,CN,(C.sub.1-C.sub.4)烷基或(C.sub.1-C.sub.4)氧基,n为零或1,X为O,S,NH,或N-(C.sub.1-C.sub.4)烷基,Y为O或S,R.sup.1为H或(C.sub.1-C.sub.4)烷基,Z是
氰基烷基,(取代)羧甲氧基烷基,(取代)羧
甲氧基苯基,亚砜基烷基或
肟基等,是对杂草草本植物具有选择性
除草剂活性的化合物。