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].
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Young,Fukuhara,Bigelow
, p. 1173 (1940)
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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.
Price,Kutschke
, p. 2128,2129 (1960)
James et al.
, p. 1761,1763 (1950)
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".
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.
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
