PYRIDINE DERIVATIVE, METHOD FOR PREPARING THE SAME, HERBICIDAL COMPOSITION CONTAINING THE SAME, AND METHOD FOR KILLING WEEDS

摘要

The present invention provides a novel pyridine derivative having the following general formula and its salt: wherein R is a hydrogen atom, a hydroxyl group, an alkoxy group, an alkoxyalkoxy group, an acyloxyalkoxy group, a benzyloxy group which may be substituted, a trimethylsilylethoxy group, an alkylsulfonylamino group, an alkylthio group, a phenoxy group which may be substituted, a thiophenoxy group which may be substituted or an imidazolyl group; R1 and R2 may be the same or different, and are a hydrogen atom, an alkoxy group, a halogen atom, an alkylamino group, a dialkylamino group, a haloalkoxy group or an alkyl group; W is an oxygen atom, a sulfur atom, a NH group or a group of the formula, >NC(O)B (wherein B is a hydrogen atom or an alkoxy group); Z is a methine group or a nitrogen atom; X is a halogen atom, a halogen-substituted alkyl group, an acylamino group, an alkyl group, a cycloalkyl group, a halocycloalkyl group, an alkenyloxy group, an alkynyloxy group, an alkoxycarbonyl group, an alkoxy group, an alkylamino group, a dialkylamino group, a phenyl group, a substituted phenyl group, a benzyl group which may be substituted, a benzyloxy group which may be substituted, a benzylthio group which may be substituted, a phenoxy group which may be substituted, a thiophenoxy group which may be substituted, an alkoxyiminoalkyl group, an acyl group, an alkylthio group, an arylamino group which may be substituted or a group having the formula, (wherein R1, R2, W and Z are as defined above); n is 0 or an integer of 1 to 3, and X may be a combination of different groups when n is at least 2; a method for preparing the same; and a herbicidal composition containing the same as an effective ingredient. The pyridine derivative and its salt of the present invention achieve an excellent herbicidal effect on annual and perennial weeds growing in paddy fields and upland fields at a very small dosage. The pyridine derivative and its salt of the present invention have safety to rice, wheat, cotton and corn, and can be suitably applied as a herbicide to a field where these plants are cultivated.