A compound of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group, a C.sub.3 -C.sub.4 alkenyl group, a C.sub.3 -C.sub.4 alkynyl group, a C.sub.1 -C.sub.4 haloalkyl group, a C.sub.3 -C.sub.4 haloalkenyl group, a C.sub.3 -C.sub.4 haloalkynyl group, a C.sub.1 -C.sub.2 alkoxy(C.sub.1 -C.sub.2)alkyl group or a C.sub.1 -C.sub.2 alkoxy(C.sub.1 -C.sub.2)alkoxy(C.sub.1 -C.sub.2)alkyl group, R.sub.2 and R.sub.3 are, the same or different, each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.3 alkyl group or a phenyl group, X is a hydrogen atom, a chlorine atom or a fluorine atom and n is an integer of 0 or 1, which is useful as a herbicide.
该化合物的
化学式为:##STR1## 其中R.sub.1是氢原子,C.sub.1-C.sub.5烷基,C.sub.3-C.sub.4烯基基团,C.sub.3-C.sub.4炔基团,C.sub.1-C.sub.4卤代烷基,C.sub.3-C.sub.4卤代烯基基团,C.sub.3-C.sub.4卤代炔基团,C.sub.1-C.sub.2烷氧基(C.sub.1-C.sub.2)烷基团或C.sub.1-C.sub.2烷氧基(C.sub.1-C.sub.2)烷氧基(C.sub.1-C.sub.2)烷基团,R.sub.2和R.sub.3是相同或不同的氢原子,卤素原子,C.sub.1-C.sub.3烷基或苯基,X是氢原子,
氯原子或
氟原子,n是0或1的整数,该化合物可用作
除草剂。