Diphenyl ether herbicides.

摘要

Phenoxy phthalide derivatives having the general formula II: <CHEM> wherein R1 represents a hydrogen or halogen atom or an alkyl or haloalkyl group; R2 and R3, which may be the same or different, each independently represents a hydrogen or halogen atom or an alkyl, haloalkyl, nitro or cyano group; R4 represents a saturated alkyl group; R5 represents an unsaturated alkyl group; and X represents an oxygen or sulphur atom, are useful as herbicides.