| 摘要 |
There are described novel homoserine derivatives of the formula (I) <IMAGE> (I) which possess valuable microbicidal properties. In the formula: Ar is substituted phenyl or naphthyl; R1 is C2-C6 alkyl optionally interrupted by oxygen or sulfur, 2-furyl, 2-tetrahydrofuryl, 1H-1,2,4-triazolylmethyl, 1-imidazolylmethyl, 1-pyrazolylmethyl, C2-C4 alkenyl or cyclopropyl, each of which is optionally substituted by halogen; R2 is hydrogen or methyl; R3 is hydrogen or C1-C4 alkyl; and B is halogen or an ester, thioester, sulfonic acid ester or sulfonic acid amide group. Additionally, where B is halogen, R1 may be halomethyl. The novel derivatives can be used for combating microorganisms harmful to plants, particularly for combating phytopathogenic fungi, and they have for practical requirements a very favorable curative and protective action for protecting cultivating plants, without the plants being impaired as a result of undesirable secondary effects. A notable feature is their stability to heat and to solar irradiation. They can be used in practice on their own or in the form of pesticidal compositions.
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