- Gas-phase epoxidation of 3,3,3-trifluoropropylene over Au/CuTiO2 catalysts with N2O as the oxidant
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Gas-phase epoxidation of 3,3,3-trifluoropropylene (TFP) was conducted on a series of Au/CuTiO2 catalysts with different Cu contents with N 2O as the oxidant. These catalysts were effective for this reaction. The best catalytic performance was obtained on a catalyst containing 4.6 wt.% of Au and 0.9 wt.% of Cu (4.6Au/0.9CuTiO2), with a steady-state 3,3,3-trifluoropropylene oxide (TFPO) formation rate of 72.4g TFPOh-1kgcat-1, which was much higher than that on a 2.1Au/TiO2 catalyst (22.1gTFPOh-1kgcat-1). The enhancement was attributed to the higher Au content in the Cu-promoted catalyst and small Au particle size and more importantly to the complicated synergy between the AuCuTiO2 interaction which might be the active sites for epoxidation. Also, high selectivity to TFPO up to 88% was obtained on the Cu-promoted catalyst, due to the proper electronic structure induced by the interaction between Au and low valent Cu species. Catalyst deactivation was due to the significant growth of Au particles and loss of AuCuTiO2 interface because of the segregation of Cu species during the reaction.
- Sun, Chong-Xiang,Wang, Yu,Jia, Ai-Ping,Chen, Shu-Xia,Luo, Meng-Fei,Lu, Ji-Qing
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- Preparation method of 3,3,3-trifluoropropylene carbonate
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The invention discloses a preparation method of 3,3,3-trifluoropropylene carbonate. The preparation method comprises the steps: with trifluoropropylene as a raw material, carrying out several simple reaction steps to obtain trifluoroepoxy propane, introducing carbon dioxide into a high-pressure reaction kettle by taking a metal conjugated microporous polymer complex as a catalyst, and preparing 3,3,3-trifluoropropylene carbonate at the temperature of 25-100 DEG C and the pressure of 0.1Mpa-3Mpa. Compared with the prior art, the method has the advantages that trifluoropropylene is taken as theraw material, so that the raw material cost is substantially lowered; and meanwhile, the yield is relatively high, and the catalyst can be repeatedly used, so that the method is suitable for industrial production.
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Paragraph 0067; 0070; 0071
(2019/03/08)
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- METHODS
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A method for preparing atetrafluoro-1,2-epoxypropane comprising reacting a 2-bromo-tetrafluoropropan-3-ol with an alkaline or alkaline earth metal hydroxide solution, a compound which is 2,3,3,3-tetrafluoro-1,2-epoxypropane, and partially fluorinated polyethers of formula [OCRR1CR2R3]n wherein n is from 5 to 100, R is F or H, R1 is CF3, R2 is F or H and R3 is H.
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Page/Page column 14; 15
(2018/11/22)
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- A method for preparing three fluorine epoxy propane
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The invention relates to a preparation method of trifluoro epoxypropane, which comprises the following steps: (1) in the presence of sulfuric acid, performing reflux reaction on 3,3,3-trifluoro-2-bromopropyl acetate and alcohol to prepare 3,3,3-trifluoro-2-bromopropanol; and (2) dropwisely adding the 3,3,3-trifluoro-2-bromopropanol into a mixture of alkali and water at 70-120 DEG C, and reacting to prepare trifluoro epoxypropane. According to the invention, the 3,3,3-trifluoro-2-bromopropyl acetate used as a raw material is subjected to ester exchange to obtain the 3,3,3-trifluoro-2-bromopropanol, the treatment method is simple, green and environment-friendly; a catalyst concentrated sulfuric acid is reusable; and the preparation efficiency of the 3,3,3-trifluoro-2-bromopropanol is high. Meanwhile, the trifluoro epoxypropane reaction yield is high.
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Paragraph 0042; 0044
(2017/03/17)
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- Preparative-scale synthesis of 3,3,3-trifluoropropene oxide
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Bromination of 3,3,3-trifluoropropene in 20% oleum, followed by treatment with acetic acid furnishes 2-bromo-3,3,3-trifluoropropyl acetate in quantitative yield, which upon acid hydrolysis and cyclization with alkali affords 3,3,3-trifluoropropene oxide (TFPO) in 63% overall yield.
- Ramachandran, P. Veeraraghavan,Padiya, Kamlesh J.
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p. 1255 - 1259
(2008/02/10)
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- Novel method for the synthesis of (trifluoromethyl)oxirane
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The reaction of 3,3,3-trifluoropropene with N-bromosuccinimide in acetic acid at 65-70 deg C affords 3-acetoxy-2-bromo-1,1,1-trifluoropropane. When treated with an alkali, the latter is readily converted into (trifluoromethyl)oxirane.
- Lermontov, S. A.,Kuryleva, N. V.,Velikokhat'ko, T. N.
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p. 550 - 551
(2007/10/03)
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- The synthesis of fluorine-containing pterins
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The synthesis of some 7,7-difluoro-7,8-dihydropterins and pterins with fluoroalkyl substituents at the 6 or 7 positions from fluorine-containing aliphatic precursors and suitably substituted pyrimidines is described. The fluorine-containing pterins were found to be very insoluble and also stable to nucleophiles and bases in dilute aqueous solution.
- Dunn, Caroline,Gibson, Colin L.,Suckling, Colin J.
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p. 13017 - 13026
(2007/10/03)
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