| 摘要 |
NEW MATERIAL:The compound of formula I {R1-R4 are H or (lower alkoxy- substituted) lower alkyl; X is O, S, methylene or group of formula N(r)-(r is H or lower alkyl); R5 is halogen; m is 0-2; R6 is mono- or disubstituted hydro carbon group substituted with group of formula II (r<1> is lower alkyl), -SO2r<2>, COr<3> [r<2> and r<3> are lower alkyl or (substituted) phenyl], etc.; n is 1 or 2} and its acid addition salt. EXAMPLE:3-{(4-Chloro-2-fluoro-5-(1-ethoxycarbonylethoxy)phenyl-imino)}- 5,6-dihy dro-6-methyl-3H-oxazolo[2,3-C][1,2,4]thiadiazol-e. USE:Selective herbicide having high safety. PREPARATION:The compound of formula III is made to react with the compound of formula IV, and the product is cyclized in the presence of an oxidizing agent.
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