Process for preparing isomers of chlorofluorocyclopentene

A chlorofluorocyclopentene and isomer technology, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc. Xenon difluoride is expensive and difficult to control, etc., to achieve the effects of low toxicity of raw materials, easy control of the reaction, and mild reaction conditions
CN105294387BActive Publication Date: 2017-04-05BEIJING YUJI SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING YUJI SCI & TECH
Publication Date
2017-04-05

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Abstract

The invention relates to a method for preparing chlorine fluorine cyclopentene isomeride in the formula (II) (please see the formula in the specification). The chlorine fluorine cyclopentene isomeride is obtained with chlorine fluorine cyclopentene in the formula (I) (please see the formula in the specification) as the raw material in solvent dimethylformamide, dimethyl sulfoxide or sulfolane by conducting an isomerization reaction in catalysts ammonium fluoride, ammonium bifluoride, potassium fluoride, lithium fluoride, sodium fluoride, rubidium fluoride or cesium fluoride. The technological method is little in raw material toxicity and mild in reaction conditions, the reaction is easy to control, the isomeride yield of chlorine fluorine cyclopentene is high, and industrialization is easy.
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Description

technical field

[0001] The invention relates to a method for preparing isomers of chlorofluorocyclopentene, in particular to a method for preparing chlorofluorocyclopentene by isomerization reaction of chlorofluorocyclopentene in ammonium fluoride or ammonium bifluoride as a catalyst The method of isomers. Background technique

[0002] Chlorofluorocyclopentene is an extremely important chemical raw material or intermediate, which can be used to synthesize octafluorocyclopentene, 1,1,2,2,3,3,4-heptafluorocyclopentane, etc. According to Gaussian calculation, the isomers of chlorofluorocyclopentene have great differences in the energy of their compounds due to their structural differences. In some fluorine-chlorine exchange reactions, the isomers with relatively higher energy Substituting the isomers with relatively low energy of the isomers of the compound can often obtain the target product with the same structure under milder reaction conditions, and its yield is higher. T...

Claims

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