Method for preparing chlorine fluorine cyclopentene isomeride
A technology of chlorofluorocyclopentene and isomers, which is applied to the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., and can solve the technical problems of trichloropentafluorocyclopentene isomers. Xenon difluoride is expensive, difficult to control, etc., to achieve the effect of low toxicity of raw materials, easy control of reaction, and mild reaction conditions
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Embodiment 1
[0032] At normal pressure, under stirring conditions, in a 250 ml glass flask equipped with a condenser and a bubbler (to make the reaction at normal pressure), add ammonium fluoride, dimethylformamide and 1,3-dichlorohexafluorocyclo Pentene, the molar ratio of ammonium fluoride / dimethylformamide / 1,3-dichlorohexafluorocyclopentene is 0.3 / 12 / 1, the reaction temperature is 50°C, and the reaction time is 3 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.
[0033] The above organic phase is rectified to obtain dichlorohexafluorocyclopentene isomers 1,4-dichlorohexafluorocyclopentene, 1,3-dichlorohexafluorocyclopentene, 1,2- Dichlorohexafluorocyclopentene. Among them, the boiling point of 1,4-dichlorohexafluorocyclopentene is 80-84°C (760mmH...
Embodiment 2
[0035]The same operation as in Example 1, except that the molar ratio of ammonium fluoride / dimethylformamide / 1,3-dichlorohexafluorocyclopentene is 0.05 / 20 / 1, and the results are shown in Table 1.
Embodiment 3
[0037] The same operation as in Example 1, except that the molar ratio of ammonium fluoride / dimethylformamide / 1,3-dichlorohexafluorocyclopentene is 0.1 / 15 / 1, and the results are shown in Table 1.
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