697-11-0Relevant academic research and scientific papers
Kinetic Studies of the Continuous Wave Laser-Induced Cyclization of Hexafluoro-1,3-butadiene
Zitter, R. N.,Koster, D. F.,Cheung, K.
, p. 1401 - 1402 (1985)
Kinetics of the isomerisation of hexafluoro-1,3-butadiene have been studied in the past by standard pyrolysis and by shock tubes, with conflicting results.The present study indicates that the pyrolysis results are correct and also indicates that vibrational-translational energy in hexafluoro-1,3-butadiene occurs through a vibrational mode that is nearly harmonic.
A T-shaped Ni[κ2-(CF2)4-] NHC complex: Unusual Csp3-F and M-CF bond functionalization reactions
Andrella, Nicholas O.,Sicard, Alexandre J.,Gorelsky, Serge I.,Korobkov, Ilia,Baker, R. Tom
, p. 6392 - 6397 (2015)
A T-shaped octafluoronickelacyclopentane-NHC complex is prepared and characterized. While the solid-state structure includes a weak isopropyl-CH3 agostic interaction, the reactivity of this complex with Lewis- and Bronsted acids is clearly enhanced by its low coordination number. Reaction with Me3SiOTf, for example, yielded a rare metal-heptafluorocyclobutyl complex whereas carboxylic acids gave substitution at the α-carbon and/or Ni-CF bond protonolysis to afford thermally robust 4H-octafluorobutyl Ni complexes.
Method for producing fluorine-containing cyclic sulfur compounds
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Paragraph 0049-0050; 0054-0062, (2021/10/27)
A method for producing a fluorine-containing cyclic sulfur compound is disclosed. The method includes mixing a perfluoroolefin having from 4 8 carbon atoms with sulfur. In addition, the method is F. 2 The present invention relates to a method for producing a fluorine-containing cyclic sulfur compound.
Synthesis of hydrohalocyclobutenes through dechlorination of hydrohalocyclobutanes in amide solvents
Guo, Qin,Lu, Fengniu,Quan, Hengdao,Zhang, Chengping,Zhang, Wenni
, (2020/03/27)
In this study, we synthesized hydrohalocyclobutenes through the dechlorination of hydrohalocyclobutanes in N,N-dimethylformamide and N,N-dimethylacetamide. The structure of the reaction site ?CClR1?CClR2– (R1 = H, F; R2 = H, F, Cl) of the reactants was critical for the efficient reductive dechlorination from the 1- and 2- positions. The reaction proceeded efficiently at the –CFCl–CFCl–, –CFCl?CCl2–, and ?CHCl?CHCl– groups. Conversely, the –CFCl?CHCl– group could hardly afford the dechlorinated product. Based on these results, we propose a rational reaction mechanism.
MANUFACTURING METHOD OF PERFLUOROCYCLOALKENE COMPOUND
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Paragraph 0083-0091, (2020/05/14)
PROBLEM TO BE SOLVED: To obtain a perfluorocycloalkene compound high in conversion ratio of a reaction at high yield and high selectivity. SOLUTION: A perfluorocycloalkene compound represented by (1), where R1 to R4 are same or different, and represent a fluorine atom or a perfluoroalkadiene compound, is obtained by conducting a cyclization reaction of a perfluoroalkanediene compound represented by CR12=CR2-CR3=CR42, where R1 to R4 are same or different and represent a fluorine atom or a perfluoroalkyl group. The cyclization reaction can be conducted in presence of a catalyst, by a gas phase continuous flow type, or by the gas phase continuous flow type in presence of the catalyst. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
Preparation method of halogenation cycloolefin
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Paragraph 0054-0057; 0072-0075, (2019/08/20)
The invention relates to a preparation method of halogenation cycloolefin and belongs to the field of chemical synthesis. According to the preparation method, in an amide or alkylamine solvent, with halogenation cycloparaffin as a raw material, a dehalogenation reaction is conducted, and the target product halogenation cycloolefin is obtained. According to the method, the reaction conditions are mild, the yield of the halogenation cycloolefin is high, dangerous reduction agents such as metal or hydrogen do not need to be used, the technology is safe and reliable, solid waste such as metal halide is not generated, and a common distillation means can be used for effective industrial separation.
Structural assignment of fluorocyclobutenes by19F NMR spectroscopy – Comparison of calculated19F NMR shielding constants with experimental19F NMR shifts
Ku?nirová, Kate?ina,?im?nek, Ond?ej,Rybá?ková, Markéta,Kví?ala, Jaroslav
, p. 3867 - 3874 (2018/10/20)
Although the optimized reduction of perfluorocyclo-butene with LiAlH4 gave a quantitative yield of the target 3,3,4,4-tetrafluorocyclobut-1-ene, unoptimized reductions led to complex inseparable mixtures of fluorocyclobutenes. These mixtures showed highly complex19F NMR spectra, the assignment of which was quite tedious. Hence, we accomplished a series of single-reference computations of the19F NMR magnetic shieldings of the corresponding fluorine atoms. Surprisingly, various DFT approaches, including both traditional and advanced functionals, gave highly diverse results with poor correlations between the experimental and computed19F chemical shifts, and the individual fluorocyclobutenes could not be identified. In contrast, the domain-based local pair natural orbital coupled clusters (DLPNO-CCSD) method, developed recently as a part of the ORCA computational package, gave shielding values that enabled the assignment of all structures observed, albeit with some systematic errors. Slightly better magnetic shielding values were obtained by a simple Hartree–Fock (HF) method with a specially tailored IGLO-III basis set. The method developed was successfully employed for the assignment of the19F NMR shifts of unknown fluorocyclobutenes.
Full-PVC butanone synthetic method
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Paragraph 0024; 0052, (2017/08/02)
The invention relates to a synthetic method of perfluorocyclobutanone. According to the method, trifluorochloroethene (I) undergoes thermal polymerization to obtain a dimer (II); then, dechloridation is carried out to obtain hexafluorocyclobutene (III); and hexafluorocyclobutene is oxidized to obtain perfluorocyclobutanone (IV). According to the technology, a trifluorochloroethene synthesis route is used such that perfluorocyclobutanone is easier to prepare. In addition, the technology is safer and more stable; impurities are less; and yield and product quality are also increased correspondingly. The synthetic method is suitable for large-scale production.
Hexafluoropropylene-2-butyne synthesizing method
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Paragraph 0051; 0052; 0053; 0054, (2016/10/08)
The invention discloses a hexafluoropropylene-2-butyne synthesizing method. Hexachlorobutadiene (CCl2=CCl-CCl=CCl2) is taken as the raw material to generate hexafluoropropylene-2-butyne under the action of a catalyst, the raw material hexachlorobutadiene is easy to obtain and low in cost. The gaseous-phase circulating fluorination method is adopted, the discharge level of three industrial wastes is low, the yield of products is high, and production cost is reduced greatly; the gaseous-phase circulating fluorination method is conducted at normal temperature, the traditional high-pressure telomerization process route is avoided, and risks in industrial safety production are reduced greatly; meanwhile, the method has the advantage that operation is easy and is totally suitable for industrial production.
Catalytic synthesis of polyfluoroolefins
Stepanov,Delyagina,Cherstkov
experimental part, p. 1290 - 1295 (2011/01/04)
A catalytic synthesis of polyfluoroolefins was developed proceeding from polyfluorochlorocarbons with the use of industrially produced nickel-chromium catalyst. Three ways of the catalytic synthesis of fluoroolefins were implemented: the cleavage of vicinal chlorine atoms from polyfluorochlorocarbons, the replacement of vinyl chlorine atoms by hydrogen in fluorochloroolrfins, and the reductive dimerization of polyfluorochlorocarbons containing a trichloromethyl group. The condition of a prolonged operation of the nickel-chromium catalyst was found consisting in the application of quartz for absorption of the hydrogen fluoride formed as a side product.
