Compounds having the structure ##STR1## wherein: R is C.sub.1 -C.sub.12 alkyl, linear or branched; or C.sub.3 -C.sub.12 alkenyl; R.sup.1 is C.sub.1 -C.sub.12 alkyl, linear or branched and can form a carbocycle; X is hydrogen or halogen; and Y is hydrogen or halogen; are disclosed which have herbicidal activity. Herbicidal compositions comprising the compounds and a carrier are also disclosed, as are methods for controlling the growth orf undesirable plants utilizing the compounds. Methods for the preparation of such compounds are also disclosed.