| 摘要 |
A substituted 3-phenyluracil of the formula IwhereX1 and X2 are each oxygen;W is -C(R8)=X5, whereX5 is oxygen, sulfur, or a radical -NR14;R14 is hydroxyl, alkoxy, alkenyloxy, alkynyloxy, cycloalkoxy, cycloalkenyloxy, haloalkoxy, haloalkenyloxy, hydroxyalkoxy, cyanoalkoxy, cycloalkylalkoxy, alkoxyalkoxy, alkoxyalkenyloxy, alkylcarbonyloxy, haloalkylcarbonyloxy, alkylcarbamoyloxy, haloalkylcarbamoyloxy, alkoxycarbonylalkoxy, alkylthioalkoxy, dialkylaminoalkoxy,R8 is hydrogen, cyano or alkyl;R1 is halogen or cyano;R2 is hydrogen or halogen;R3 is hydrogen or alkyl;R4 is cyano, alkyl or haloalkyl;R5 is hydrogen, halogen or alkyl;or a salt or enol ether of a compound I wherein R3 is hydrogen, or its tautomeric forms, for the desiccation and defoliation of plants or as an insecticide or herbicide.
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