- Method for preparing E-1, 1, 1, 4, 4, 4-hexafluoro-2-butene by gas phase fluorination
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The invention discloses a method for preparing E-1, 1, 1, 4, 4, 4-hexafluoro-2-butene by gas-phase fluorination. The method comprises the following steps: in the presence of a fluorination catalyst, carrying out fluorination reaction on tetrafluorobutane or tetrachlorobutane and hydrogen fluoride to obtain the E-1, 1, 1, 4, 4, 4-hexafluoro-2-butene. The method is mainly used for efficiently and continuously producing E-1, 1, 1, 4, 4, 4-hexafluoro-2-butene in a circulating manner.
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Paragraph 0031-0033
(2021/05/01)
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- METHOD OF HYDRODECHLORINATION TO PRODUCE DIHYDROFLUORINATED OLEFINS
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Disclosed is a process for the preparation of fluorine-containing olefins comprising contacting a chlorofluoroalkene with hydrogen in the presence of a catalyst at a temperature sufficient to cause replacement of the chlorine substituents of the chlorofluoroalkene with hydrogen to produce a fluorine-containing olefin, wherein said catalyst is a composition comprising chromium, nickel and optionally an alkali metal selected from potassium and cesium. Also disclosed are catalyst compositions for the hydrodechlorination of chlorofluoroalkenes comprising copper, nickel, and an alkali metal selected from potassium and cesium, and methods of making such catalysts.
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Page/Page column 4-5
(2010/07/04)
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- PROCESS FOR MAKING 1,1,1,4,4,4-HEXAFLUORO-2-BUTENE
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A process is disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent and 2,2'-bipyridine. A process is also disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent and a Cu(I) salt. A process is further disclosed for making 1,1,1,4,4,4-hexafluoro-2-butene. The process involves reacting 2,2-dichloro-1,1,1-trifluoroethane with copper in the presence of an amide solvent, 2,2'-bipyridine and a Cu(I) salt.
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Page/Page column 8-9
(2009/10/22)
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- Method of Hydrodechlorination to Produce Dihydrofluorinated Olefins
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Disclosed herein is a process for the preparation of fluorine-containing olefins comprising contacting a chlorofluoroalkene with hydrogen in the presence of a catalyst at a temperature sufficient to cause replacement of the chlorine substituents with hydrogen. Also disclosed is a catalyst composition for the hydrodechlorination of chlorofluoroalkenes comprising copper metal deposited on a support.
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Page/Page column 7
(2009/01/24)
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- Matrix-isolation and ab initio molecular orbital study of 2,2,2-trifluoroethylidene
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Photolysis of 2,2,2-trifluorodiazoethane (2) in an argon matrix at 12 K generates triplet 2,2,2-trifluoroethylidene (1) in addition to a significant amount of trifluoroethylene (3) and small amounts of trifluoromethyldiazirine (4). These compounds were identified by IR and UV spectroscopy. Short-wavelength - photolysis of the carbene 1 converts it to trifluoroethylene, while slowly warming the matrix to 35 K results in dimerization to the isomeric hexafluorobut-2-enes. High-level ab initio calculations (QCISD(T)6-311(2D,2P)//MP2-FC/6-31G**) are reported for the singlet and triplet states of 2,2,2-trifluoroethylidene as well as for methylene and ethylidene. The calculated IR spectrum for triplet 2,2,2-trifluoroethylidene is in good agreement with the experimental one, but the UV/vis spectrum calculated using the CIS method does not match very well. The transition structures for the 1,2-fluorine atom rearrangement of the single and triplet states of carbene 1 to trifluoroethene were calculated at the QCISD(T)-FC/6-311(2D,2P)//MP2-FC/6-31G** level of theory. The calculated barrier for 1,2-fluorine atom migration in the singlet carbene, 21.5 kcal/mol, is less than suggested by recent experimental results (29 ± 4 kcal/ mol). The calculated barrier for the corresponding rearrangement in the triplet system was 51 kcal/mol. Previous reports concerning the energies and geometries of these calculated transition structures are shown to be in error.
- O'Gara, John E.,Dailey, William P.
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p. 12016 - 12021
(2007/10/03)
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- REACTION OF HYDROXY AND CARBONYL COMPOUNDS WITH SULFUR TETRAFLUORIDE. X. REACTION OF ALIPHATIC β-HYDROXYCARBOXYLIC ACIDS WITH SULFUR TETRAFLUORIDE
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The reactions of 3-hydroxypropionic, d,l-3-hydroxybutyric, d,l-4,4,4-trifluoro-3-hydroxybutyric, and 4,4,4-trifluoro-3-trifluoromethyl-3-hydroxybutyric acids with sulfur tetrafluoride were investigated.It was shown that the electronic nature of the substituents at the β-carbon atom has a significant effect on the direction of the reactions of β-hydroxycarboxylic acids with sulfur tetrafluoride.
- Motnyak, L. A.,Burmakov, A. I.,Kunshenko, B. V.,Neizvestnaya, T. A.,Alekseeva, L. A.,Yagupol'skii, L. M.
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p. 634 - 640
(2007/10/02)
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- Reaction of aliphatic α-hydroxy carboxylic acids with sulfur tetrafluoride
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Trifluoroalkyl fluorosulfites are mostly formed during the reaction of glycolic, d,l-lactic, and d,l-malic acids with sulfur tetrafluoride.Hydrolysis of the products gave the corresponding trifluoromethylcarbinols.
- Burmakov, A. I.,Motnyak, L. A.,Kunshenko, B. V.,Alekseeva, L. A.,Yagupol'skii, L. M.
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p. 1204 - 1209
(2007/10/02)
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