| 摘要 |
A herbicidal compound of formula (I): <CHEM> in which R<1> is independently selected from H, CN, NO2, halogen, lower alkyl, lower haloalkyl; m is an integer of from 1 to 4; R<2> is N or CR<1> where R<1> is as defined above; R<3> is a group of formula (a), (b) or (c): <CHEM> or N-oxide or quaternary salt derivatives thereof wherein R<4> is a specified organic group. Processes for the preparation of these compounds and compositions containing them are also described. |
