OXADIAZOL-2-ONE DERIVATIVE AND HERICIDE COMPRISING SAME AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound shown by the formula I (R is alkyl, or benzyl; R' is phenyl or alpha-naphthyl which may be replaced with halogen, etc.) EXAMPLE:3-Methyl-5-(4-chlorophenoxy)-1,3,4-oxadiazol-2-one. USE:A herbicide. PREPARATION:A carbazinic ester (novel substance) shown by the formula II is reacted with phosgene ina solvent such as benzene, CCl4, THF, etc., at -20-100 deg.C to give a phosgene derivative shown by the formula III, which is further subjected to ring formation by adding a base such as pyridine, triethylamine, etc., at -20-150 deg.C to give a compound shown by the formula I.