| 摘要 |
Novel pyridine and pyrazine derivatives of the formula <IMAGE> I wherein R4 is 3-pyridyl, 3-pyridyl-1-oxide, 2-pyrazinyl, 2-pyrazinyl-1-oxide, 2-pyrazinyl-4-oxide or 2-pyrazinyl-1,4-dioxide, and R, R1, R2 and R3 are as hereinafter set forth, processes for their preparation, fungicidal compositions containing said compounds, and methods for the use of such compounds or compositions for combatting fungi in agriculture and in horticulture are disclosed. Novel starting materials and fungicidal active substances of the formula <IMAGE> V wherein R4' is 3-pyridyl or 2-pyrazinyl, and R and R1'' as hereinafter set forth, which are used for the preparation of the compounds of formula I, and their N-oxides, as well as fungicidal compositions containing these compounds as the active substance, are also described.
|
