Application of ionic liquid and catalytic oxime removal method thereof

A technology of ionic liquid and catalyst, which is applied in the application of ionic liquid and the field of ionic liquid catalytic deoxime, can solve the problems of difficult product separation, reduced yield of aldehydes and ketones, environmental pollution, etc., and achieves easy separation of products, simple preparation method, The effect of low melting point
CN101838175BInactive Publication Date: 2013-08-21HARBIN NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN NORMAL UNIVERSITY
Publication Date
2013-08-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an application of ionic liquid and a catalytic oxime removal method thereof, solving the problems of environment pollution and difficult product separation in an existing acid catalysis hydrolyzing and oxime removing method, and easily generated overreaction and lowered aldehyde ketone yield in an oxidation / reduction oxime removal method. The method comprises the followingsteps: 1) adding raw material oxime and ionic liquid serving as a deoximation catalyst in a reactor, stirring and refluxing at the temperature of 40-100 DEG C; and 2) adding extractant to recover theionic liquid serving as a deoximation catalyst, performing reduced pressure distillation on liquid at the extractant layer, removing the extractant to obtain the product after oxime removal. In the invention, the ionic liquid serves as a reaction catalyst as well as a solvent, has no volatility, and can be used repeatedly, needs no acidic reagent, and is an environment-friendly organic reaction solvent; the product is easily separated without byproducts, and the yield of aldehyde or ketone is 53.5-100%; and the ionic liquid can be used for protecting carbonyl groups or preparing aldehyde ketone compounds.
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Description

technical field

[0001] The invention relates to the application of ionic liquid and its catalytic deoximation method. Background technique

[0002] Deoxime reaction is often used to protect carbonyl groups in organic synthesis, and now it has also become a new way to prepare aldehydes and ketones. There are many methods for deoxime reaction, among which acid-catalyzed hydrolysis is usually carried out in sulfuric acid, boric acid and other systems, using a large amount of strong acid, which pollutes the environment and makes product separation difficult; the other two main methods are oxidation And reduction method, oxidation method uses strong oxidant, such as periodic acid, potassium permanganate, this method not only converts oxime into aldehyde or ketone in the reaction, but also prone to over-oxidation, aldehyde or ketone continues to be oxidized to acid Or ester; the reduction method uses noble metals, such as Raney nickel, in the reaction, not only the oxime is conve...

Claims

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