| 摘要 |
Compounds having the formula <IMAGE> in which R1 is alkyl, lower alkenyl, chloro-lower alkyl, lower cycloalkyl, lower alkoxy, thio-lower alkyl, or <IMAGE> R2 is hydrogen, lower alkoxyalkyl or lower alkanoyl; R3 and R4 are independently hydrogen, lower alkyl or lower alkoxy; X and Y are independently chloro, fluoro or bromo; Z is hydrogen, methyl, dimethyl or one methyl and one chloro substituent; and n is 0 or 1. The compounds have utility as herbicides, particularly as post-emergence herbicides.
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