| 摘要 |
<p>A benzoxazine derivative and a benzothiazine derivative having the formula (I): <CHEM> wherein A is N or a CH group; B is O, S, an SO group or an SO2 group; W is O, S, a CR<4>R<5> group or an NR<4> group wherein R<4> and R<5> are each independently a hydrogen atom, a CN group or an NO2 group; X, Y and Z are each independently a hydrogen atom, a halogen atom or a lower haloalkyl group having 1 to 3 carbon atoms; R<1> is a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, a lower alkenyl group having 2 to 5 carbon atoms, a lower alkynyl group having 2 to 5 carbon atoms, a lower hydroxyalkyl group having 1 to 5 carbon atoms or a lower haloalkyl group having 1 to 3 carbon atoms; and R<2> and R<3> are each independently a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms or an aryl group having 6 to 10 carbon atoms and a herbicidal composition containing the compound of the formula (I) as an active ingredient. </p> |
