| 摘要 |
The invention is concerned with novel C1-4-alkyl, C2-4-alkenyl and C3 or 4-alkynyl enol ethers of 3-aryluracils of the formula <IMAGE> I' wherein R1, R2, R3, R4, R5 and X are as defined in the specification, their manufacture, weed control compositions which contain such enol ethers as the active substance and the use of the active substances or compositions for the control of weeds. The invention is also concerned with certain novel intermediates, some of which possess herbicidal activity, and with weed control compositions containing such active substances.
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