WO2010014548A2 - Procédé pour la préparation de cis-alcène perfluoré - Google Patents
Procédé pour la préparation de cis-alcène perfluoré Download PDFInfo
- Publication number
- WO2010014548A2 WO2010014548A2 PCT/US2009/051847 US2009051847W WO2010014548A2 WO 2010014548 A2 WO2010014548 A2 WO 2010014548A2 US 2009051847 W US2009051847 W US 2009051847W WO 2010014548 A2 WO2010014548 A2 WO 2010014548A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- perfluorinated
- cis
- process according
- aromatic amine
- hexafluoro
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
- C07C17/354—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction by hydrogenation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
- B01J23/04—Alkali metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C21/00—Acyclic unsaturated compounds containing halogen atoms
- C07C21/02—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds
- C07C21/18—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds containing fluorine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/58—Platinum group metals with alkali- or alkaline earth metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/62—Platinum group metals with gallium, indium, thallium, germanium, tin or lead
- B01J23/622—Platinum group metals with gallium, indium, thallium, germanium, tin or lead with germanium, tin or lead
- B01J23/628—Platinum group metals with gallium, indium, thallium, germanium, tin or lead with germanium, tin or lead with lead
Definitions
- the present disclosure relates to a process for the preparation of a perfluorinated cis-alkene, and more specifically the preparation of cis- 1,1, 1,4 ,4,4- hexafluoro-2-butene.
- Fluorocarbon based fluids have found widespread use in industry in a number of applications, including as refrigerants, aerosol propellants, blowing agents, heat transfer media, and gaseous dielectrics. Because of the suspected environmental problems associated with the use of some of these fluids, including
- I 5 the relatively high global warming potentials (GWP) associated therewith, it is desirable to use fluids having the lowest possible greenhouse warming potential in addition to zero ozone depletion potential (ODP).
- ODP ozone depletion potential
- Fluorinated butenes having zero ozone depletion and low global warming potential have been identified as potentially filling this need.
- the toxicity, boiling point, and other physical properties in this class of chemicals vary greatly from isomer to isomer.
- One fluorobutene having valuable properties is cis-
- the large difference in boiling points may mean that only one isomer is suitable and the other isomer therefore represents a yield loss.
- Another reason such a mixture is undesirable is that a good means for recycling the undesired trans-isomer is lacking.
- a suitable process will provide the cis:tra ⁇ s isomers in a ratio of 10: 1 or better.
- the conversion was only 82 % and the product was a mixture of cis-hexafluoro-2-butene (41 % yield) and hexafluorobutane (25 % yield).
- the amount of over-reduced material should be less than 10 %. Still more preferably, the total amount of trans-isomer and butane are together less than 10 %.
- alkynes to alkenes include Pd/C, Pd/BaSO 4 , Pd/BaCO 3 , and Pd/CaCO 3 .
- the use of quinoline as a catalyst modifier has been recommended whether the catalyst is Pd/C, Pd/BaSO 4 , or Lindlar's catalyst, Pd/CaCO 3 /Pb (M. Hudlicky, Reductions in Organic Chemistry, 2 nd Ed., ACS Monograph 188, 1996, p 8).
- the Lindlar catalyst is probably the most common one used for the reduction of hydrocarbon alkynes to cis-alkenes, modified further by the addition of an aromatic amine such as quinoline or pyridine.
- aromatic amine such as quinoline or pyridine.
- the amines while often useful in improving reaction selectivity, are not desirable from the standpoint of their
- the quality of the quinoline used may also affect the outcome.
- the PdVCaCO 3 ZPb catalyst, modified with pyridine, was successfully used in the reduction of an alkyne bearing a single fluorine on the carbon adjacent to the triple bond to give the corresponding cis-alkene (M. Prakesch, D. Gree, and R. Gree, J. Org. Chem., 66 (2001) 3146).
- fluorocarbons often behave quite differently compared to non-fluorinated alkanes, and perfluorinated compounds may behave quite differently than even partially fluorinated compounds of similar structure.
- SUMMARY 30 A process for the preparation of perfluorinated cis-alkenes comprising: reducing a perfluorinated alkyne with hydrogen over a palladium catalyst in the presence of a non-aromatic amine catalyst modifier to form a product comprising the perfluorinated cis-alkene, wherein the perfluorinated alkyne has the general structure: 3S RfC ⁇ CRf wherein Rf is a perfluorinated alkyl group having a carbon number in the range between about 1 to 6.
- the process is for the preparation of cis- 1,1,1, 4,4,4-hexafluoro-2- butene comprising: reducing hexafluoro-2-butyne with hydrogen over a palladium catalyst in the presence of a non-aromatic amine catalyst modifier to form a product comprising the cis- 1,1,1 ,4,4,4,-hexafluoro-2-butene.
- the over reduction to CF 3 CH 2 CH 2 CF 3 is less than 10 mole %, and wherein the cis- 1 , 1 , 1 ,4,4,4,- hexafluoro-2-butene product has less than about 10 mole % of trans- 1,1, 1,4,4,4- hexafluoro-2-butene.
- the reduction step is carried out at a temperature in the range between about O 0 C to about 15O 0 C.
- the reduction step is carried out at a temperature in the range between about 25°C to about 75°C.
- the reduction step is preferably carried out in the presence of a reaction solvent.
- the reaction solvent is at least one solvent selected from the group consisting of: alkanes, aryls, alcohols, acids and esters.
- the reaction solvent is at least one solvent selected from the group consisting of: heptane, toluene, methanol, ethanol, acetic acid and ethyl acetate.
- the reduction step is conducted at a pressure in the range between about 10 to 350 psig (72 to 2532 kPa), more preferably in the range between about 20 to 100 psig (145 to 723 kPa).
- hydrogen is added as needed to during the reduction step to avoid over-reduction.
- the palladium catalyst includes palladium and a catalyst support, wherein the catalyst support is at least one material selected from the group consisting of: calcium carbonate, barium carbonate and sulfate, charcoal, activated carbon, and alumina.
- Preferred catalyst supports are calcium and barium carbonate, while calcium carbonate is most preferred.
- the non-aromatic amine catalyst modifier is at least one selected from the group consisting of: alkali metal hydroxides, metals and metal salts.
- the alkali metal hydroxide is preferably KOH.
- the metal is at least one metal selected from the group consisting of: lead, zinc, ruthenium, copper, iron and tin.
- the preferred catalyst modifier is lead.
- the process further comprises the step of distilling the cis- 1,1, 1,4 ,4,4,- hexafluoro-2-butene product such that it has a cis- 1,1,1 ,4,4,4,-hexafluoro-2-butene concentration in the range between about 90 to 99.9%.
- the starting material for this disclosure can be obtained by a variety of methods.
- the latter in turn can be prepared by the reductive dimerization of CF 3 CCI 3 (S Tomioka et al, Chemistry Letters, 1991, 1825).
- Comparative Examples A and B show that neither Pd/C with quinoline nor Pd/BaS ⁇ 4 were satisfactory catalysts for the selective reduction of hexafluoro-2-butene to cis-l,l,l,4,4,4-hexafluoro-2-butene, even though these catalyst systems have been successfully employed for the selective reduction of non-fluorinated alkynes. Both were unacceptable due to over-reduction, even where less than one equivalent of hydrogen had been consumed Surprisingly, however, Pd/CaCOs/Pb worked exceeding well (Examples 1 and 2), even without an aromatic amine modifier such as quinoline.
- the temperature used for the reduction can be varied over a wide range from about 0 0 C to about 150 0 C, but the higher temperatures reported earlier in order to achieve a high percentage of cis-olefin are not necessary according to the process of this disclosure. Reactions near room temperature are the most convenient, but slightly higher temperatures may be desirable in order to achieve improved productivity. Especially preferred temperatures are in the range between about 25 to 75 0 C.
- the reaction solvent can be any non-reactive solvent. These include alkanes, aryls, alcohols, acids and esters. Specific examples of these include heptane, toluene, methanol, acetic acid and ethyl acetate. Lower molecular weight alcohols are preferred and ethanol is most preferred.
- the ratio of perfluorinated alkyne to catalyst can vary from about 1000 or more on a mole basis to about 1 , but is typically 2-100.
- a higher ratio e.g. low catalyst loading
- lower ratios higher catalyst loading
- the pressure can vary considerably within the range of equipment capability. High pressures tend to speed up the reaction but may lead to overreduction. Hence the preferred pressures are 10 to 350 psig (72 to 2532 kPa) and more preferably 20-100 psig (145 to 723 kPa). In order to maximize the utilization of hydrogen, less than one equivalent may be added initially and more added as needed to complete the reaction or to maintain a desired hydrogen pressure.
- a 1 -liter autoclave was charged with 2.0 g of catalyst (5 % palladium on calcium carbonate poisoned with 3.5 % lead) and 160 mL ethanol. The autoclave contents were then cooled to -78 C. Air was removed by pressurizing to 60 psi (434 kPa) with nitrogen followed by evacuating. The sequence was repeated twice more. Hexafluoro-2-butyne (32 g) was then added and the contents warmed to 25°C.
- Hydrogen gas was added to a pressure 90 psig (651 kPa) and was maintained at this pressure for approximately 20 hours at a reaction temperature of 25-28 0 C.
- the autoclave contents were again cooled with the aid of a -78°C bath prior to venting hydrogen gas.
- the material in the autoclave was distilled to give 31.6 g of 97 % pure cis-hexafluoro-2-butene (97.5 % yield). Three such preparations were made and the combined materials redistilled to give the desired butene, bp 30-32 0 C, in greater than 99.9 % purity (H NMR: 6.56 ppm; F NMR: -60.17 ppm).
- Example 2 was run in a manner similar to that of Example 1 except that the ratio of hexafluoro-2-butyne to catalyst was doubled, and the hydrogen pressure reduced to a maximum of 60 psig (434 kPa). Similar results were obtained.
- COMPARATIVE EXAMPLE A A pressure reactor was charged with 0.20 grams of 5 % palladium on carbon, 0.042 grams of reagent grade quinoline as catalyst poison and 25 mL of ethanol. After removing air as described in Example 1, 2.0 grams of hexafluoro-2- butyne was added. Hydrogenation was conducted at 20 psig (145 kPa) hydrogen pressure at room temperature. Workup and distillation as before gave 1.5 grams of CF 3 CH 2 CH 2 CF 3 ( 1 H NMR: 2.5 ppm; 19 F NMR: -66.8 ppm). Thus, even though the operating pressure was lower, over-reduction readily occurred to give the undesired butane.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
Abstract
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009801300180A CN102112420A (zh) | 2008-07-31 | 2009-07-27 | 制备全氟化的顺式烯烃的方法 |
MX2011000995A MX2011000995A (es) | 2008-07-31 | 2009-07-27 | Proceso para la preparacion de cis-alqueno perfluorado. |
EP09803441A EP2310347A4 (fr) | 2008-07-31 | 2009-07-27 | Procédé pour la préparation de cis-alcène perfluoré |
JP2011521221A JP2011529893A (ja) | 2008-07-31 | 2009-07-27 | ペルフッ素化シス−アルケンの製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8507708P | 2008-07-31 | 2008-07-31 | |
US61/085,077 | 2008-07-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010014548A2 true WO2010014548A2 (fr) | 2010-02-04 |
WO2010014548A3 WO2010014548A3 (fr) | 2010-04-01 |
Family
ID=41610923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/051847 WO2010014548A2 (fr) | 2008-07-31 | 2009-07-27 | Procédé pour la préparation de cis-alcène perfluoré |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2310347A4 (fr) |
JP (1) | JP2011529893A (fr) |
KR (1) | KR20110049820A (fr) |
CN (1) | CN102112420A (fr) |
MX (1) | MX2011000995A (fr) |
WO (1) | WO2010014548A2 (fr) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011158790A1 (fr) * | 2010-06-14 | 2011-12-22 | 独立行政法人産業技術総合研究所 | Procédé pour la production d'un composé de fluor |
WO2012079011A1 (fr) * | 2010-12-10 | 2012-06-14 | E. I. Du Pont De Nemours And Company | Purification du cis-1,1,1,4,4,4-hexafluoro-2-butène par distillation extractrice |
CN102892738A (zh) * | 2010-05-21 | 2013-01-23 | 霍尼韦尔国际公司 | 生产氟代烯烃的方法 |
JP2013529216A (ja) * | 2010-05-21 | 2013-07-18 | ハネウェル・インターナショナル・インコーポレーテッド | 1,1,1,4,4,4−ヘキサフルオロ−2−ブテンのための方法 |
JP2013529215A (ja) * | 2010-05-21 | 2013-07-18 | ハネウェル・インターナショナル・インコーポレーテッド | ヘキサフルオロ−2−ブチンの製造方法 |
JP2016034970A (ja) * | 2010-03-26 | 2016-03-17 | ハネウェル・インターナショナル・インコーポレーテッド | ヘキサフルオロ−2−ブテンの製造方法 |
CN106008147A (zh) * | 2016-05-23 | 2016-10-12 | 北京宇极科技发展有限公司 | Z-1,1,1,4,4,4-六氟-2-丁烯的制备方法 |
EP3102556A1 (fr) * | 2014-02-07 | 2016-12-14 | The Chemours Company FC, LLC | Procédé intégré de production de z-1,1,1,4,4,4-hexafluoro-2-butène |
CN116060010A (zh) * | 2023-03-31 | 2023-05-05 | 北京宇极科技发展有限公司 | 引发剂、氟化催化剂以及e-1,1,1,4,4,4-六氟-2-丁烯的制备方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0822248A2 (pt) * | 2008-05-23 | 2019-09-24 | Du Pont | "processos para a síntese de alcenos fluorados e processo para hidrogenação" |
Family Cites Families (5)
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JPS6014003B2 (ja) * | 1978-11-08 | 1985-04-11 | 信越化学工業株式会社 | シス−オレフィン化合物の選択的製造方法 |
JPS56133230A (en) * | 1980-03-21 | 1981-10-19 | Otsuka Pharmaceut Co Ltd | Preparation of cis-olefin |
US5587348A (en) * | 1995-04-19 | 1996-12-24 | Phillips Petroleum Company | Alkyne hydrogenation catalyst and process |
DE19526473A1 (de) * | 1995-07-20 | 1997-01-23 | Basf Ag | Verfahren zur Herstellung von Alkenen durch partielle Hydrierung von Alkinen an Festbett-Palladium-Katalysatoren |
DE19962907A1 (de) * | 1999-12-23 | 2001-07-05 | Basf Ag | Verfahren zur Herstellung von C¶10¶-C¶30¶-Alkenen durch partielle Hydrierung von Alkinen an Festbett-Palladium-Trägerkatalysatoren |
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2009
- 2009-07-27 CN CN2009801300180A patent/CN102112420A/zh active Pending
- 2009-07-27 JP JP2011521221A patent/JP2011529893A/ja active Pending
- 2009-07-27 WO PCT/US2009/051847 patent/WO2010014548A2/fr active Application Filing
- 2009-07-27 EP EP09803441A patent/EP2310347A4/fr not_active Withdrawn
- 2009-07-27 MX MX2011000995A patent/MX2011000995A/es not_active Application Discontinuation
- 2009-07-27 KR KR1020117004186A patent/KR20110049820A/ko not_active Application Discontinuation
Non-Patent Citations (7)
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BURGER ET AL., JOURNAL OF MOLECULAR STRUCTURE, vol. 84, 1982, pages 49 - 68 |
LINDLAR H, HELVETICA CHIMICA ACTA, vol. 35, no. 2, 1952, pages 446 - 450 |
M. HUDLICKY: "Reductions in Organic Chemistry", vol. 188, 1996, ACS MONOGRAPH, pages: 8 |
M. PRAKESCH; D. GREE; R. GREE, J. ORG. CHEM., vol. 66, 2001, pages 3146 |
S. TAKEI; M. ONO, NIPPON NOGEI KAGAKU KAISI, vol. 18, 1942, pages 119 |
See also references of EP2310347A4 |
SPEE ET AL., J. ORG. CHEM, vol. 66, 2001, pages 1647 - 56 |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016034970A (ja) * | 2010-03-26 | 2016-03-17 | ハネウェル・インターナショナル・インコーポレーテッド | ヘキサフルオロ−2−ブテンの製造方法 |
JP2017125023A (ja) * | 2010-03-26 | 2017-07-20 | ハネウェル・インターナショナル・インコーポレーテッド | ヘキサフルオロ−2−ブテンの製造方法 |
EP2571836B1 (fr) | 2010-05-21 | 2016-10-26 | Honeywell International Inc. | Procédé de fabrication d'hexafluoro-2-butyne |
US8901360B2 (en) | 2010-05-21 | 2014-12-02 | Honeywell International Inc. | Process for cis 1,1,1,4,4,4-hexafluoro-2-butene |
JP2013529216A (ja) * | 2010-05-21 | 2013-07-18 | ハネウェル・インターナショナル・インコーポレーテッド | 1,1,1,4,4,4−ヘキサフルオロ−2−ブテンのための方法 |
JP2013529215A (ja) * | 2010-05-21 | 2013-07-18 | ハネウェル・インターナショナル・インコーポレーテッド | ヘキサフルオロ−2−ブチンの製造方法 |
JP2013530143A (ja) * | 2010-05-21 | 2013-07-25 | ハネウェル・インターナショナル・インコーポレーテッド | フッ素化アルケンの製造方法 |
US8524955B2 (en) | 2010-05-21 | 2013-09-03 | Honeywell International Inc. | Process for the preparation of hexafluoro-2-butyne |
CN102892738A (zh) * | 2010-05-21 | 2013-01-23 | 霍尼韦尔国际公司 | 生产氟代烯烃的方法 |
EP2571836B2 (fr) † | 2010-05-21 | 2019-10-23 | Honeywell International Inc. | Procédé de fabrication d'hexafluoro-2-butyne |
WO2011158790A1 (fr) * | 2010-06-14 | 2011-12-22 | 独立行政法人産業技術総合研究所 | Procédé pour la production d'un composé de fluor |
JP2012001448A (ja) * | 2010-06-14 | 2012-01-05 | National Institute Of Advanced Industrial Science & Technology | フッ素化合物の製造方法 |
WO2012079011A1 (fr) * | 2010-12-10 | 2012-06-14 | E. I. Du Pont De Nemours And Company | Purification du cis-1,1,1,4,4,4-hexafluoro-2-butène par distillation extractrice |
US8871987B2 (en) | 2010-12-10 | 2014-10-28 | E I Du Pont De Nemours And Company | Purification of cis-1,1,1,4,4,4-hexafluoro-2-butene via extractive distillation |
EP3102556A1 (fr) * | 2014-02-07 | 2016-12-14 | The Chemours Company FC, LLC | Procédé intégré de production de z-1,1,1,4,4,4-hexafluoro-2-butène |
EP3102556B1 (fr) * | 2014-02-07 | 2023-03-29 | The Chemours Company FC, LLC | Procédé intégré de production de z-1,1,1,4,4,4-hexafluoro-2-butène |
CN106008147A (zh) * | 2016-05-23 | 2016-10-12 | 北京宇极科技发展有限公司 | Z-1,1,1,4,4,4-六氟-2-丁烯的制备方法 |
CN106008147B (zh) * | 2016-05-23 | 2018-11-02 | 北京宇极科技发展有限公司 | Z-1,1,1,4,4,4-六氟-2-丁烯的制备方法 |
CN116060010A (zh) * | 2023-03-31 | 2023-05-05 | 北京宇极科技发展有限公司 | 引发剂、氟化催化剂以及e-1,1,1,4,4,4-六氟-2-丁烯的制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CN102112420A (zh) | 2011-06-29 |
EP2310347A4 (fr) | 2012-10-31 |
WO2010014548A3 (fr) | 2010-04-01 |
KR20110049820A (ko) | 2011-05-12 |
MX2011000995A (es) | 2011-03-04 |
JP2011529893A (ja) | 2011-12-15 |
EP2310347A2 (fr) | 2011-04-20 |
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