4-Phenoxycoumarins and thio derivatives thereof, their preparation and use as herbicides
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0694257A1
公开(公告)日:1996-01-31
Compounds of formula I
wherein
X and X'are each independently halogen, C₁-C₄alkyl, or C₂-C₄alkenyl;
W, Y and Zare each independently O or S; and
R and R₁are as defined in Claim 1,
methods for their preparation, herbicidal compositions containing them, and methods for the control of monocotyledenous plants, in particular of monocotyledenous weeds in the presence of cereal crops, by applying them.
式 I 的化合物
式中
X和X'各自独立地为卤素、C₁-C₄烷基或C₂-C₄烯基;
W、Y 和 Z 各自独立地为 O 或 S;以及
R 和 R₁ 如权利要求 1 所定义、
它们的制备方法、含有它们的除草组合物,以及通过施用它们控制单子叶植物,特别是谷类作物中的单子叶杂草的方法。