Method for producing oxime ethers

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 249/14 (2006.01) C07C 249/12 (2006.01) C07C 251/32 (2006.01) C07C 251/38 (2006.01)

Patent

CA 2405763

The invention relates to a method for producing oxime ethers of formula (I), in which the substituents R1 and R2 can be identical or different and can respectively represent cyano, alkyl, haloalkyl, cycloalkyl, phenyl and naphthyl and R3 can represent alkyl, by the alkylation of oximes of the formula (II), under alkaline conditions, using an alkylation agent from the group containing alkyl halides, dialkyl sulfates and dialkyl carbonates. The reaction is carried out in a mixture consisting of between 5 and 25 wt.- % polar aprotic solvents, selected from the group containing nitriles, N- alkylpyrrolidones, cyclic urea derivatives, dimethylformamide and dimethylacetamide, between 55 and 95 wt.- % non-polar solvents, selected from the group containing aliphatic hydrocarbons, aromatic hydrocarbons, alkyl esters of alkyl carboxylic acid and ethers and between 0 and 25 wt.- % water, whereby the sum of said proportions amounts to 100 %.

L'invention concerne un procédé de production d'éthers d'oxime de formule (I), dans laquelle les substituants R?1¿ et R?2¿ peuvent être identiques ou différents et peuvent représenter respectivement cyano, alkyle, halogénure d'alkyle, cycloalkyle, phényle et naphtyle, et R?3¿ alkyle, par alkylation d'oximes de formule (II), dans des conditions basiques, au moyen d'un agent d'alkylation sélectionné dans le groupe comprenant les halogénures d'alkyle, sulfates de dialkyle et carbonates de dialkyle. La réaction est effectuée dans un mélange contenant 5 à 25 % en poids d'un solvant aprotique polaire sélectionné dans le groupe comprenant les nitriles, N-alkylpyrrolidones, dérivés d'urée cycliques, diméthylformamide et diméthylacétamide, 55 à 95 % en poids d'un solvant non polaire sélectionné dans le groupe comprenant les hydrocarbures aliphatiques, les hydrocarbures aromatiques, les alkylesters d'acide alkylcarboxylique et les éthers, et 0 à 25 % en poids d'eau, la somme de ces proportions étant égale à 100 %.

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