| 摘要 |
<p>NEW MATERIAL:The 1,3,4-oxadiazolin-5-one derivative of formula I (Ar is phenyl, phenyl substituted with Cl or methyl, or beta-naphthyl; R is H or methyl). EXAMPLE:2-[1-(4-Chloro-o-tolyloxy)ethyl]-4-(2-oxo-3,3-dimethylbutyl)-1 ,3,4-oxadiazolin-5-one. USE:Herbicide. Effective for the selective control of the weeds in the field of crops such as corn, potato, sugar cane, soybean, peanut, wheat, etc. when applied just before the sprouting of the weeds or at the initial growth stage of the weeds. PREPARATION:The compound of formula I can be prepared e.g. by reacting the compound of formula II with the compound of formula III (hal is Cl or Br) in the presence of a base in a solvent such as dimethylformamide, etc.</p> |
