Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof, wherein X1, X2, X3, n and P are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention.所揭示者為式1之化合物,包括其所有立體異構物、N-氧化物及鹽類,其中X1、X2、X3、n及P係如本揭露中所界定者。亦揭示者為含式1化合物之組成物與用於防治非所欲植物之方法,該方法包含使該非所欲植物或其環境接觸有效量之本發明化合物或組成物。