| 摘要 |
<p>NEW MATERIAL:A compound of formula I [X<1> is 1-4C alkyl, hydroxy, 1-4C alkoxy, amino, nitro, halogen; X<2> is H, halogen; X<1> is not H when X<1> is 4-amino; R<1> is H, 1-4C alkyl, COOR<3> (R<3> is 1-4C alkyl), phenyl, etc.; Y<1> is H, 1-6C alkyl, 3-4C alkenyl, 3-4C alkinyl, 2-6C alkyl sustitutable at O]. EXAMPLE:5-Methyl-3-(4-methylphenyl sulfonylamino)-1,2,4-oxadiazole. USE:A herbicide. The compound of formula I exhibits an excellent herbicidal activity against upland or rice field weeds such as E chinochloa, Cyperus and Scirpus and has high safety to crops. PREPARATION:A hydroxy guanidine derivative of formula II is reacted with an acid halide of formula III (X<3> is halogen) or an acid anhydride of formula IV to provide the compound of formula I.</p> |
