| 摘要 |
Herbicides have the formula <IMAGE> in which R is hydrogen, mono- or poly-halo, mono- or di-(C1-C4 alkyl), C1-C4 alkoxy, C1-C4 haloalkoxy, phenoxy or nitro; R1 is hydrogen or C1-C4 alkyl; R3 is C1-C6 alkyl; R2 is C2-C4 alkyl, C3-C6 cycloalkyl, phenyl, optionally substituted by C1-C4 alkyl, C1-C4 haloalkyl, C1-C4 haloalkoxy, one or more halogens, or two C1-C4 alkoxy groups, or one C1-C4 alkyl and one C1-C4 alkoxy group, phenyl-(C1-C2)alkyl or pyridyl; or R1 and R2, and/or R3 and R4 respectively, taken together with the nitrogen atom, form a 4-8 member ring, optionally including an oxygen heteroatom; and R4 is C1-C6 alkyl, C3-C6 cycloalkyl, phenyl, optionally substituted by C1-C4 alkyl, C1-C4 haloalkyl, C1-C4 haloalkoxy, one or more halogens, or two C1-C4 alkoxy groups, or one C1-C4 alkyl and one C1-C4 alkoxy group, phenyl-(C1-C2 alkyl) or pyridyl; provided that if R1 is hydrogen, R2 is alkyl or cycloalkyl.
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