Bitki öldürücü maddeler olarak 4-fenoksikumarinler.

摘要

Compounds of formula I wherein X and X' are each independently halogen, C1-C4alkyl, or C2-C4alkenyl; W, Y and Z are each independently O or S; and R and R1 are 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.