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Method for simultaneous preparation of trichloropentafluorocyclopentene isomers

A technology for trichloropentafluorocyclopentene and isomers is applied in the field of simultaneous preparation of trichloropentafluorocyclopentene isomers, and can solve the problems of difficult separation of isomers, harsh technology, limitations and the like , to achieve the effect of easy availability of raw materials and cheap fluorination reagents

Active Publication Date: 2017-06-16
BEIJING YUJI SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned technology has the following deficiencies: firstly, most of the isomers of a single type of trichloropentafluorocyclopentene are prepared; secondly, the technology for simultaneously preparing isomers of trichloropentafluorocyclopentene is too harsh, Adopt uneasy control, highly toxic Na-Ag-Hg alloy or high temperature (600 ℃) pyrolysis; Secondly, the productive rate of preparing trichloropentafluorocyclopentene isomers is low, and basically limited Stereoisomers named according to the R / S system nomenclature. In industry, such isomers are difficult to effectively separate by ordinary delicate means

Method used

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  • Method for simultaneous preparation of trichloropentafluorocyclopentene isomers
  • Method for simultaneous preparation of trichloropentafluorocyclopentene isomers

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Normal pressure, under stirring condition, in the 250 milliliter glass flasks that condenser tube and bubbler (make reaction be in normal pressure) are housed, add Potassium Fluoride, dimethylformamide and hexachlorocyclopentadiene, its mol The ratio potassium fluoride / dimethylformamide / hexachlorocyclopentadiene is 5 / 14 / 1, the reaction temperature is 120°C, and the reaction time is 10 hours. After the reaction, wash 100ml × 3 times to remove the solvent, dry with 2.0g of anhydrous magnesium sulfate, filter to obtain the organic phase, take the organic phase and carry out gas chromatography to analyze the composition of the organic matter. The results are shown in Table 1.

[0024] The above-mentioned organic phase is subjected to rectification to obtain trichloropentafluorocyclopentene isomers 1,4,4-trichloropentafluorocyclopentene, 1,3,3-trichloropentafluorocyclopentene, 1,2,3-Trichloropentafluorocyclopentene and 1,2,4-Trichloropentafluorocyclopentene. Among them, the...

Embodiment 2

[0026] The same operation as in Example 1, except that the molar ratio of potassium fluoride / dimethylformamide / hexachlorocyclopentadiene is 4 / 20 / 1, and the results are shown in Table 1.

Embodiment 3

[0028] The same operation as in Example 1, except that the molar ratio of potassium fluoride / dimethylformamide / hexachlorocyclopentadiene is 4.5 / 16 / 1, and the results are shown in Table 1.

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Abstract

The invention relates to a method for simultaneously preparing trichloropentafluorocyclopentene isomers. The method is characterized in that a raw material perhalocyclopentene or / and perhalocyclopentadiene undergoes a liquid phase fluorine-chlorine exchange reaction in the presence of a fluorination reagent and a solvent under a stirring condition to obtain the following three trichloropentafluorocyclopentene isomers: 1,2,4-trichloropentafluorocyclopentene, 1,2,3-trichloropentafluorocyclopentene, 1,3,3-trichloropentafluorocyclopentene and 1,4,4-trichloropentafluorocyclopentene. The method has the advantages of easily available raw material, cheap fluorination reagent, high yield of the isomers, and suitableness for simultaneously preparing the trichloropentafluorocyclopentene isomers through a large-scale liquid phase reaction.

Description

technical field [0001] The invention relates to a method for simultaneously preparing isomers of trichloropentafluorocyclopentene, in particular to a method for obtaining trichloropentafluorocyclopentadiene (or octachlorocyclopentene) by reacting potassium fluoride Preparation method of three isomers of fluorocyclopentene. Background technique [0002] Trichloropentafluorocyclopentene isomers are extremely important chemical raw materials or intermediates, which can be used to synthesize etchant octafluorocyclopentene and cleaning agents 1,1,2,2,3,3,4 - Heptafluorocyclopentane and the like. According to Gauss calculation, trichloropentafluorocyclopentene isomers 1,2,4-trichloropentafluorocyclopentene, 1,2,3-trichloropentafluorocyclopentene, 1,3,3- Due to the difference in structure of trichloropentafluorocyclopentene and 1,4,4-trichloropentafluorocyclopentene, the energy of their compounds is very different. In some fluorine and chlorine exchange reactions, the energy of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/20C07C17/21C07C23/08
CPCC07C17/208C07C17/21C07C23/08
Inventor 张呈平庆飞要周晓猛权恒道
Owner BEIJING YUJI SCI & TECH