Process for producing fluoroolefins
A technology selected from fluorine-containing olefins, which is applied to the preparation of fluorinated olefins or fluorinated halogenated olefins or fluorinated olefins. The compound includes the field of general formulas, which can solve the problems of low product yield and prolonged reaction time.
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Embodiment 1
[0040] CF 3 CH 2 CF 2 Dehydrofluorination of H(HFC-245fa)
[0041] To a 100 ml aqueous solution of potassium hydroxide (20 wt %) containing the crown ether 18-crown-6 (0.050 g, 0.2 mmol) in an autoclave / bottle was added CF at about 0°C 3 CH 2 CF 2 H (5.93 g, 44 mmol). The stirred reaction mixture was gradually warmed to room temperature (about 20-25° C.) and stirred for about 2 more hours. The volatile product CF formed by the reaction was collected in a cold trap at about -78 °C 3 CH=CFH (3.76 g, 33 mmol, 75% yield).
Embodiment 2
[0043] CF 3 CH 2 CF 2 Dehydrofluorination of H(HFC-245fa)
[0044] (A) In the absence of crown ethers
[0045] CF 3 CH 2 CF 2 H (6.0 g, 44 mmol). The stirred reaction mixture was sealed in a reaction vessel / pressure bottle and allowed to warm to room temperature and stirred for 24 hours. Analysis of volatiles in the reaction vessel by gas chromatography showed unreacted starting material.
[0046] (B) In the presence of crown ethers
[0047] Reaction (A) was repeated as above except that crown ether 18-crown-6 (0.025 g, 0.1 mmol) was added to the reaction mixture. Under these conditions, obtaining CF 3 CH=CFH (67% yield) (85% conversion).
Embodiment 3
[0049] CF 3 CH 2 CF 2 Dehydrochlorination of Cl(HCFC-235fa)
[0050] To a 100 ml aqueous solution of potassium hydroxide (20 wt %) containing the crown ether 18-crown-6 (0.084 g, 0.31 mmol) in an autoclave / bottle was added CF at about 0°C 3 CH 2 CF 2 Cl (6.4 g, 38.7 mmol). The stirred reaction mixture in a sealed autoclave / bottle was gradually warmed to room temperature and stirred for about another 1 hour. Gas chromatography analysis (retention time 1.9 minutes, for CF 3 CH=CF 2 ) showed 93% conversion. The volatile species CF formed during the reaction were collected in a cold trap at about -78 °C 3 CH=CF 2 (3.47g, 26mmol, 67% yield).
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