Patent ID: 6680410
Filing Date: 2004-01-20
Classification: C07C

Abstract:
A process for preparing oxime ethers of the formula I, in which the substituents R1 and R2 can be identical or different and can each be cyano, C1-C4-alkyl, C1-C4-haloalkyl, C3-C6-cycloalkyl, phenyl and naphthyl, and R3 can be C1-C4-alkyl, by alkylation of oximes of the formula II under basic conditions with an alkylating agent from the group of alkyl halides, dialkyl sulfates and dialkyl carbonates, wherein the reaction is carried out in a mixture consisting of 5 to 25% by weight of polar aprotic solvents selected from the group of nitrites, N-alkyl-pyrrolidones, cyclic urea derivatives, dimethylformamide and dimethylacetamide, 55 to 95% by weight of nonpolar solvents selected from the group of aliphatic hydrocarbons, aromatic hydrocarbons, alkyl alkylcarboxylates and ethers, and 0 to 25% by weight of water, the contents thereof totaling 100%.