| 摘要 |
NEW MATERIAL:The compound of formula I [R<1> is lower alkyl, (halogen- substituted) lower alkoxy-lower alkyl, lower alkenyl, group of formula II (R<3> is lower alkyl; n is 1 or 2), etc.; Y is O or S; R<2> is lower alkyl or lower alkoxy] or its salt. EXAMPLE:N-(4-penthyloxy-3-fluorophenyl)-N,N'-dimethylurea. USE:A herbicide having low phytotoxicity to crops such as corn and exhibiting excellent herbicidal activity. PREPARATION:The compound of formula I can be produced by reacting the compound of formula III with the compound of formula R<1>-X<1> (X<1> is halogen, alkylsulfonyloxy, etc.) in a solvent optionally in the presence of an acid acceptor at 10-50 deg.C.
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