| 摘要 |
The present invention relates to a process for preparing trioxime derivatives of the formula I in which the substituents R<SUP>1 </SUP>and R<SUP>2 </SUP>are identical or different and each is cyano, alkyl, haloalkyl or cycloalkyl, and R<SUP>3 </SUP>and R<SUP>4 </SUP>are identical or different and each is alkyl, haloalkyl, cycloalkyl, alkylcarbonyl or arylalkyl, by the following reaction steps in water without isolation of the intermediates: A) nitrosation of 1,3-diketones of the formula II to give monooximes of the formula III, B) oximation of III with hydroxylamine derivatives of the formula IV <?in-line-formulae description="In-line Formulae" end="lead"?>H<SUB>2</SUB>N-OR<SUP>3'</SUP> IV<?in-line-formulae description="In-line Formulae" end="tail"?> in which R<SUP>3'</SUP> is hydrogen or a group R<SUP>3 </SUP>to give bisoximes of the formula V, C) alkylation of V with alkylating agents or acylation of V with acylating agents to give compounds of the formula VI and D) subsequent oximation of VI with hydroxylamine to give compounds of the formula I.
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