354-33-6Relevant articles and documents
Metal-free dehydrogenation of tri- and diethylamine with (C2F5)3PF2
Bader, Julia,Neumann, Beate,Stammler, Hans-Georg,Ignat'ev, Nikolai,Hoge, Berthold
, p. 12 - 17 (2018)
The reaction of the strong Lewis acid (C2F5)3PF2 with triethylamine leads to an initial hydride abstraction, resulting in the formation of the hydridophosphate anion [P(C2F5)3F2H]? and the iminium ion [CH3CH = NEt2]+. The latter is deprotonated by a second molecule NEt3 which corresponds to a formal hydrogen abstraction from the amine. The resulting nucleophilic enamine is trapped by a second equivalent of (C2F5)3PF2, ultimately yielding the β-aminovinylphosphorane derivative (C2F5)2PF2C2H2NEt2. The β-aminovinylphosphorane reacts with CsF to the corresponding trifluorophosphate derivative, [P(C2F5)2F3C2H2NEt2]?, which hydrolyzes to the aldehyde [P(C2F5)2F3CH2CHO]?, while the reaction with anhydrous HF yields the zwitterionic species [P(C2F5)2F3C2H3NEt2].
Kinetics of gaseous fluorination of 1,1,1,2-tetrafluoroethane with elemental fluorine
Pashkevich,Muhortov,Podpalkina,Barabanov
, p. 3 - 5 (1999)
The kinetics and temperature dependence of gaseous fluorination of 1,1,1,2-tetrafluoroethane (TFE) with elemental fluorine have been investigated between 105-148°C. Experiments were conducted in a stationary isothermic regime in copper tubes. Undiluted fluorine was used in a mixture with 1,1,1,2-TFE in concentration from 4% to 10% by volume. Explanations of observed mechanisms are suggested on the basis of the theory of chain reactions.
Preparation of 1,1,1,2-tetrafluoroethane by the vapor-phase catalytic reaction of 1,1,1-trifluoro-2-chloroethane with anhydrous hydrogen fluoride
Quan, Heng-Dao,Yang, Hui-E,Li, Zhong,Ren, Jian-Zhang,Li, Hui-Li
, p. 193 - 199 (2001)
1,1,1,2-Tetrafluoroethane was prepared in 97% selectivity by the vapor-phase catalytic reaction of 1,1,1-trifluoro-2-chloroethane with anhydrous hydrogen fluoride (AHF) over a metal fluoride catalyst (CrF3 and CoF2) supported on porous aluminum fluoride (PAF). The relationship between the crystalline phase transition of porous aluminum fluoride and temperature from 100 to 640°C was investigated by X-ray diffraction.
Production of fluorinated ethanes using elemental fluorine
Pashkevich,Mukhortov,Alekseev,Asovich
, p. 1269 - 1274 (2002)
Scientific principles of industrial gas-phase fluorination of fluoroethanes with elemental fluorine were developed. Conditions for fluorination of low-fluorinated ethanes without rupture of the C-C bond were determined.
Pretreatment effect on the properties of the Cr–Mg catalyst for the gas-phase hydrofluorination of perchloroethylene into pentafluoroethane
Petrov,Zirka,Reshetnikov
, p. 392 - 396 (2017)
The effect of the temperature of thermal pretreatment of the precursors of the Cr–Mg catalyst on its physicochemical properties (specific surface area and elemental composition) and catalytic properties has been experimentally investigated. The dehydration of the precursor takes place up to a temperature of ~500°С, making it possible to tune the catalyst composition by varying the heat-treatment temperature. The samples prepared from precursors with various compositions differ in their specific surface area and catalytic activity. The highest activity is shown by the catalyst prepared by heat treatment of the precursor at 330°С.
Gas-phase fluorination of fluoroethanes with elemental fluorine
Pashkevich,Mukhortov,Alekseev,Asovich,Rozhdestvenskaya
, p. 1151 - 1155 (2001)
Scientific basis for industrial gas-phase fluorination of fluoroethanes with elemental fluorine allowing production of higher-fluorinated fluoroethanes from lower-fluorinated compounds is developed. 2001 MAIK "Nauka/Interperiodica".
Nitrogen trifluoride as an oxidative co-reagent in high temperature vapor phase hydrofluorinations
Belter, Randolph K.,Sweval, Mark S.,Iikubo, Yuichi
, p. 816 - 820 (2006)
Nitrogen trifluoride (NF3) has proven to be a useful additive in high temperature vapor phase hydrofluorination reactions of chlorocarbons. The activity of chromium-based catalysts is maintained by introducing a co-stream of NF3 into the reagent chlorocarbon and HF stream. NF3 is a desirable additive instead of O2 as there is no water generation due to its use.
Catalytic performance of nitrogen-doped activated carbon supported Pd catalyst for hydrodechlorination of 2,4-dichlorophenol or chloropentafluoroethane
Tang, Haodong,Xu, Bin,Xiang, Meng,Chen, Xinxin,Wang, Yao,Liu, Zongjian
, (2019/02/24)
Nitrogen-doped activated carbon (N-AC) obtained through the thermal treatment of a mixture of HNO3-pretreated activated carbon (AC) and urea under N2 atmosphere at 600 ?C was used as the carrier of Pd catalyst for both liquid-phase hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) and gas-phase hydrodechlorination of chloropentafluoroethane (R-115). The effects of nitrogen doping on the dispersion and stability of Pd, atomic ratio of Pd/Pd2+ on the surface of the catalyzer, the catalyst’s hydrodechlorination activity, as well as the stability of N species in two different reaction systems were investigated. Our results suggest that, despite no improvement in the dispersion of Pd, nitrogen doping may significantly raise the atomic ratio of Pd/Pd2+ on the catalyst surface, with a value of 1.2 on Pd/AC but 2.2 on Pd/N-AC. Three types of N species, namely graphitic, pyridinic, and pyrrolic nitrogen, were observed on the surface of Pd/N-AC, and graphitic nitrogen was stable in both liquid-phase hydrodechlorination of 2,4-DCP and gas-phase hydrodechlorination of R-115, with pyridinic and pyrrolic nitrogen being unstable during gas-phase hydrodechlorination of R-115. As a result, the average size of Pd nanocrystals on Pd/N-AC was almost kept unchanged after liquid-phase hydrodechlorination of 2,4-DCP, whereas crystal growth of Pd was clearly observed on Pd/N-AC after gas-phase hydrodechlorination of R-115. The activity test revealed that Pd/N-AC exhibited a much better performance than Pd/AC in liquid-phase hydrodechlorination of 2,4-DCP, probably due to the enhanced stability of Pd exposed to the environment resulting from nitrogen doping as suggested by the higher atomic ratio of Pd/Pd2+ on the catalyst surface. In the gas-phase hydrodechlorination of R-115, however, a more rapid deactivation phenomenon occurred on Pd/N-AC than on Pd/AC despite a higher activity initially observed on Pd/N-AC, hinting that the stability of pyridinic and pyrrolic nitrogen plays an important role in the determination of catalytic performance of Pd/N-AC.
PROCESS FOR PRODUCING FLUOROETHANE
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Paragraph 0046, (2015/12/04)
Fluorochromium oxide having a fluorine content of not less than 30 wt.% is used for the fluorination reaction. To provide a manufacturing method for fluorine-containing ethane which contains 1, 1, 1, 2, 2-pentafluoroethane as the main component in which the reaction can be performed while controlling the generation of CFCs to the greatest possible extent by fluorinating at least one selected from the group composed of tetrachloroethylene, 2, 2-dichloro-1, 1, 1-trifluoroethane and 2-chloro-1, 1, 1, 2-tetrafluoroethane with hydrogen fluoride.
On the feasibility of nickel-catalyzed trifluoromethylation of aryl halides
Jover, Jess,Miloserdov, Fedor M.,Benet-Buchholz, Jordi,Grushin, Vladimir V.,Maseras, Feliu
, p. 6531 - 6543 (2015/02/19)
A computational screening of 42 bidentate phosphines (PP) has yielded promising candidates for Ph-CF3 reductive elimination from Ni(II) complexes of the type [(PP)Ni(Ph)(CF3)]. The computed barriers and synthetic accessibility consid
