- Synthesis method of tetrafluoropropyl trifluoroethylene ether
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The invention relates to a preparation method of tetrafluoropropyl trifluoroethylene ether. The preparation method comprises the following main steps: in an alkaline environment, under the condition of heating, carrying out substitution and elimination on tetrafluoropropanol and 1,2-dibromo-1,1,2-trifluoroethane to obtain the tetrafluoropropyl trifluoroethylene ether. Compared with the existing reaction, the method provided by the invention has the advantages of simple reaction type, mild reaction conditions, strong operability, no use of organic solvents, environmental protection, fast reaction rate and high product yield, overcomes the difficulty of using metallic sodium and organic solvents in the prior art, reduces the reaction risk, and is suitable for industrial production.
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Paragraph 0044-0047
(2020/05/01)
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- Method for preparing hexafluoro-1,3-butadiene
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The invention relates to a method for preparing hexafluoro-1,3-butadiene. The method comprises the following steps: performing reduction dechloridation on 1,2-dichloro-1,1,-2-halothane with zinc powder to obtain a CF2=CHF gas phase intermediate product, introducing into liquid bromine to carry out an addition reaction, and obtaining CBrF2CHBrF; evaporating CBrF2CHBrF in an evaporator to generate a gas, and using a reaction tube filled with a first catalyst to remove one molecule HBr and generate trifluorovinyl bromide; performing two steps of reactions on the trifluorovinyl bromide under the action of the zinc powder, the solvent and a second catalyst, thereby obtaining the hexafluoro-1,3-butadiene. The method has the advantages of being simple in process, high in yield, easy in raw material obtaining, easy in industrialization, green and environment-friendly.
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Paragraph 0057; 0058; 0059; 0060
(2017/08/27)
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- A synthetic hexafluoro - 1, 3 - butadiene method (by machine translation)
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The invention relates to a method for synthesizing hexafluoro-1,3-butadiene, and belongs to the field of organic chemistry synthesis. The method for synthesizing hexafluoro-1,3-butadiene comprises the following steps: removing hydrogen fluoride from tetrafluoro ethane (HFC-134a) under the action of a catalyst to generate trifluoroethylene; rapidly reacting trifluoroethylene with liquid bromine to generate 1,2-dibromo-1,1,2-trifluoroethane, and removing hydrogen bromide under alkaline conditions to obtain trifluorobromoethylene; and reacting trifluorobromoethylene with activated zinc powder and N,N-dimethyl formamide to generate trifluorovinylzinc, and carrying out a coupling reaction on trifluorovinylzinc under the action of Fe to generate hexafluoro-1,3-butadiene. A solvent can be recovered after above reactions. The method has the advantages of low price and convenient source of raw materials, good stability and long service of the catalyst, simple separation and purification of the above product, and easy industrial production.
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Paragraph 0035-0037
(2017/09/26)
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- Theoretical and experimental studies for preparing 1, 1-dibromo-1,2,2,2-tetrafluoroethane on gas-phase bromination of 1,1,1,2-tetrafluoroethane
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Efficient gas-phase bromination of 1, 1, 1, 2-tetrafluoroethane (HFC-134a) for the preparation of 1, 1-dibromo-1, 2, 2, 2-tetrafluoroethane (CF3CFBr2) has been described for the first time. A wide-ranging experimental investigation o
- Hu, Ruzhu,Zhang, Chengping,Qing, Feiyao,Quan, Hengdao
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- Reactions of perfluorinated alkenyl-, alkynyl-, alkyltrifluoroborates, and selected hydrocarbon analogues with the halogenating agents Hal2 (Hal = F, Cl, Br), "brF" (BrF3-Br2 1:1), and ICl
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Reactions of [Bu4N][RBF3] [R = CnF 2n+1CF=CF (cis, trans), CF2=CF, CF2=C(CF 3), trans-C4H9CF=CF, trans-C6H 5CF=CF, C4H9CH=CH (cis, trans), CF 3C≡C, and C4H9C≡C] with chlorine, bromine, BrF3 + Br2 (as equivalent of "BrF"), and ICl in solution (CH2Cl2, CHCl3, CF 3CH2CF2CH3) led to 1, 2-addition of halogen and/or replacement of boron by halogen (halodeboration). The reaction of [Bu4N][CF3C≡CBF3] with less than equimolar amounts of diluted fluorine (5 %) in 1, 1, 1, 3, 3-pentafluorobutane (PFB) showed only [Bu4N][CF3CF2CF 2BF3] as fluorine addition product besides extensive fluorodeboration. Suspensions of the insoluble K[CF2=CFBF 3] salt reacted with Cl2 and Br2 in CH 2Cl2 giving preferentially products of halogen addition across the C=C bond. In reactions with ICl iododeboration with formation of CF2=CFI occurred besides 1, 2-addition with formation of [CF 2I-CFClBF3]-. The halodeboration reaction of[Bu4N][trans-C4H9CF=CFBF3] with Br2, "BrF", and ICl, of K[trans-C6H 5CF=CFBF3] with Br2, and of [Bu 4N][trans-C4F9CF=CFBF3] with ICl proceeded stereospecifically. Copyright
- Bardin, Vadim V.,Adonin, Nicolay Yu.,Frohn, Hermann-Josef
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experimental part
p. 565 - 579
(2012/05/20)
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- CHEMICAL PRODUCTION PROCESSES AND SYSTEMS
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Chemical production processes are provided that include reacting a metal comprising olefin to form a conjugated olefin; reacting a heterohalogenated olefin to form a conjugated olefin; reacting a halogenated alkane to form a conjugated olefin; and/or reacting a hydrohalogenated olefin to form a conjugated olefin. Chemical production systems are also provided that can include: a first reactant reservoir configured to house a perhalogenated olefin; a second reactant reservoir configured to house a catalyst mixture; a first reactor coupled to both the first and second reservoirs, the first reactor configured to house a metal-comprising mixture and receive both the perhaloganated olefin form the first reactant reservoir and the reactant mixture from the second reactant reservoir; and a product collection reservoir coupled to the first reactor and configured to house a conjugated olefin.
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Page/Page column 15
(2008/06/13)
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- Isotopic Selectivity in Infrared Multiphoton Dissociation of CF3CH(D)BrCl
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The infrared multiphoton dissociation of CF3CDBrCl in the presence of equimolar CF3CHBrCl was investigated with attention to the isotopic selectivity of the reaction.Large selectivity was found at pressures lower than 3 Torr .Several products were obtained, and the molar fraction of deuterium-containing species (deuterium fraction) of each product was measured.The products were classified into two groups with respect to the pressure and fluence dependences of the deuterium fraction.A reaction scheme, consistent with the experimental results, is proposed.
- Masuda, Toshikatsu,Sakka, Tetsuo,Ogata, Yukio,Iwasaki, Matae
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p. 771 - 774
(2007/10/02)
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