1,3,4-OXADIAZOLE DERIVATIVE, ITS PREPARATION, AND HERBICIDE CONTAINING IT AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound shown by the formula I (R is H, lower akyl, alkoxymethyl, halomethyl, mono- - dialkylaminomethyl). EXAMPLE:3-Methoxymethyl-5-[3-( 2-chloro-4-trifluoromethylphenoxy )-6-nitro]phenyl-1,2,4-oxadiazole. USE:A herbicide useful as soil, foliar or flooding treatment in paddy fields, plowed fields, orchards, pastures, lawns, forests, nonagricultural lands, etc. PREPARATION:A compound shown by the formula II (X is halogen) is reacted with a compound shown by the formula III (R' is H, lower alkyl, alkoxymethyl, or halomethyl), the prepared compound shown by the formula IV is condensed through dehydration, or a compound shown by the formula V (Y is halogen) is reacted with a compound shown by the formula R1R2NH (R1 and R2 are H, and at least one is lower alkyl), to give a compound shown by the formula I .