| 摘要 |
Quaternary salts of formula (I):
<CHEM>
wherein R represents methyl or ethyl;
R<1> represents halo, methoxy, C1-C4 alkylthio, benzylthio or dimethylamino;
R<2> represents hydrogen, phenoxy, phenylthio, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylthio, phenyl or phenyl monosubstituted with halo, trifluoromethyl, C1-C4 alkyl or C1-C4 alkoxy;
R<3> represents C1-C4 alkyl, C1-C4 alkoxy, trifluormethyl or halo;
E represents an anion capable of forming a pyridinium salt; and
n represents an integer of 1 to 3, are useful herbicides. The compounds are prepared by alkylation of the appropriate pyridine, pyridinone or pyridinethione intermediate. |
