354-34-7Relevant articles and documents
Cryoozonolysis of some perfluoroolefins and use of perfluoro ozonides as polymerization initiators
Kiryukhin,Barkalov,Ismoilov
, p. 1740 - 1743 (2001)
Low-temperature (77-280 K) ozonolysis of perfluoro-4-methyl-2-pentene and perfluoro-2,4-dimethyl-3-ethyl-2-pentene by direct contact with ozone in the absence of solvents and oxygen was studied. The resulting perfluoro ozonides can be used as initiators o
The Reaction of Vanadium Pentafluoride with Phosphorus Oxytrifluoride and with Trifluoroacetic Acid
Fowler, Brian R.,Moss, Kenneth C.
, p. 67 - 74 (1980)
Vanadium pentafluoride reacts via an oxygen exchange reaction with phosphorous oxytrifluoride to give VOF3 and PF5.The latter forms a weak 1:1 adduct.VF5 reacts with trifluoroacetic acid to form trifluoroacetyl fluoride and VOF3.Both reactions are indicative of the strength of the V=O bond and its influence on the course of the reactions of VF5 with oxygen containing materials.
THE DIRECT FLUORINATION OF ACETONE
Clark, Wayne D.,Lagow, Richard J.
, p. 37 - 43 (1991)
A synthesis for hexafluoroacetone using elemental fluorine is reported.Previously hexafluoroacetone and other ketones have been difficult to prepare using fluorination based syntheses.
THE ELECTROCEHIMCAL FLUORINATION OF ACETYL FLUORIDE
Wasser, D. J.,Johnson, P. S.,Klink, F. W.,Kucera, F.,Liu, Chung-Chiun
, p. 557 - 570 (1987)
The electrochemical fluorination of acetyl fluoride in anhydrous hydrogen fluoride to produce trifluoroacetyl fluoride was investigated in a microprocessor-aided modified Simons' reactor.The product was recorvered in acetic as trifluoroacetic acid.The experiments were carried out at a controlled anodic potential using a Cu/CuF2 reference electrode.Product yields of 36-45percent, current efficiencies of 30 to 50percent and energy efficiencies of 11-23percent were obtained.Experimental results of this investigation are presented and discussed.
Atmospheric chemistry of CF3CF double bond CF2: Kinetics and mechanism of its reactions with OH radicals, Cl atoms, and ozone
Mashino,Ninomiya,Kawasaki,Wallington,Hurley
, p. 7255 - 7260 (2000)
Smog chamber/FTIR techniques were used to study the OH radical, the Cl atom, and ozone initiated oxidation of CF3CF double bond CF2 in 700 Torr of air at 296 K. Relative rate methods were used to measure k(OH+CF3CF double bond CF2) = (2.4±0.3)×10-12 and k(Cl+CF3CF double bond CF2) = (2.7±0.3)×10-11; absolute techniques were used to derive an upper limit of k(O3+CF3CF double bond CF2)-21 cm3 molecule-1 s-1. OH radical and Cl atom-initiated atmospheric oxidation of CF3CF double bond F2 gives COF2 and CF3C(O)F in molar yields of 100%. The atmospheric lifetime of CF3CF double bond CF2 is approximately 9 days with degradation proceeding via reaction with OH radicals to give trifluoroacetic acid in a molar yield of 100%. Results are discussed with respect to previous measurements of k(OH+CF3CF double bond CF2) and k(O3+CF3CF double bond CF2) and the potential importance of CF3CF double bond CF2 as a source of trifluoroacetic acid.
Perfluoroalkyl ether as well as preparation and application thereof
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Paragraph 0054-0058, (2020/12/15)
The invention relates to perfluoroalkyl ether as well as a preparation method and application thereof, wherein the preparation method specifically comprises the steps: taking perfluoroalkyl acyl fluoride and fluorinated metal salt as raw materials, and carrying out a reaction with a halogenated alkane substrate in the presence of a halogenated metal catalyst to obtain a target product perfluoroalkyl ether compound. Compared with the prior art, the method has the advantages that the synthesis process is simple and green, excellent selectivity and high yield are achieved, meanwhile, the perfluoroalkoxylation reagent and raw materials are cheap and easy to obtain, reaction conditions are mild, operation is easy, cost is low, popularization is easy, and the method is suitable for mass production; in addition, the method provided by the invention can be used for conveniently and efficiently preparing a plurality of novel alkoxy silanes of perfluoropolyether which can be applied to anti-fingerprint coatings.
Trifluoromethyl Benzoate: A Versatile Trifluoromethoxylation Reagent
Zhou, Min,Ni, Chuanfa,Zeng, Yuwen,Hu, Jinbo
supporting information, p. 6801 - 6805 (2018/05/31)
Trifluoromethyl benzoate (TFBz) is developed as a new shelf-stable trifluoromethoxylation reagent, which can be easily prepared from inexpensive starting materials using KF as the only fluorine source. The synthetic potency of TFBz is demonstrated by trifluoromethoxylation-halogenation of arynes, nucleophilic substitution of alkyl (pseudo)halides, cross-coupling with aryl stannanes, and asymmetric difunctionalization of alkenes. The unprecedented trifluoromethoxylation-halogenation of arynes proceeds smoothly at room temperature with the aid of a crown ether-complexed potassium cation, which significantly stabilizes the trifluoromethoxide anion derived from TFBz.
Perfluoroacetyl fluoride and preparation method thereof
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Paragraph 0019; 0020; 0021; 0022, (2017/07/22)
The invention belongs to the technical field of fluorine fine chemical industry, and particularly relates to perfluoroacetyl fluoride and a preparation method thereof. The preparation method is as follows: trifluoroacetic anhydride is used as a material, and under the actions of alkali metal fluoride and organic alkali, a reaction is performed in an aprotic solvent to obtain the perfluoroacetyl fluoride. In the preparation process of the perfluoroacetyl fluoride, the trifluoroacetic anhydride is used as a starting reactant, and under the actions of catalysts, high-value chemical intermediate perfluoroacetyl fluoride is produced; the product yield is high, the raw material cost is low, the reaction condition is mild, the reaction process is simple in operation, the purification process is simple, the product purity is 99% or higher, and large-scale industrial production is easy.
Shock wave studies of the pyrolysis of fluorocarbon oxygenates. I. The thermal dissociation of C3F6O and CF3COF
Cobos,Hintzer,S?lter,Tellbach,Thaler,Troe
, p. 3151 - 3158 (2017/08/17)
The thermal decomposition of hexafluoropropylene oxide, C3F6O, to perfluoroacetyl fluoride, CF3COF, and CF2 has been studied in shock waves highly diluted in Ar between 630 and 1000 K. The measured rate constant k1 = 1.1 × 1014exp(-162(±4) kJ mol-1/RT) s-1 agrees well with literature data and modelling results. Using the reaction as a precursor, equimolar mixtures of CF3COF and CF2 were further heated. Combining experimental observations with theoretical modelling (on the CBS-QB3 and G4MP2 ab initio composite levels), CF3COF is shown to dissociate on two channels, either leading to CF2 + COF2 or to CF3 + FCO. By monitoring the CF2 signals, the branching ratio was determined between 1400 and 1900 K. The high pressure rate constants for the two channels were obtained from theoretical modelling as k5,∞(CF3COF → CF2 + COF2) = 7.1 × 1014exp(-320 kJ mol-1/RT) s-1 and k6,∞(CF3COF → CF3 + FCO) = 3.9 × 1015exp(-355 kJ mol-1/RT) s-1. The experimental results obtained at [Ar] ≈ 5 × 10-6 mol cm-3 were consistent with modelling results, showing that the reaction is in the falloff range of the unimolecular dissociation. The mechanism of secondary reactions following CF3COF dissociation has been analysed as well.
Atmospheric chemistry of CF3CF2CHO: Absorption cross sections in the UV and IR regions, photolysis at 308 nm, and gas-phase reaction with OH radicals (T = 263-358 K)
Antinolo, Maria,Jimenez, Elena,Gonzalez, Sergio,Albaladejo, Jose
, p. 178 - 186 (2014/02/14)
The relative importance in the atmosphere of UV photolysis of perfluoropropionaldehyde, CF3CF2CHO, and reaction with hydroxyl (OH) radicals has been investigated in this work. First, the forbidden n → π* transition of the carbonyl chromophore was characterized between 230 and 380 nm as a function of temperature (269-298 K) and UV absorption cross sections, σλ, were determined in those ranges. In addition, IR absorption cross sections were determined between 4000 and 500 cm-1. Pulsed laser photolysis (PLP) of CF3CF 2CHO coupled to Fourier transform infrared (FTIR) was employed to determine the overall photolysis quantum yield, Φλ, at 308 nm and 298 K. Φλ=308 nm was pressure dependent, ranging from (0.94 ± 0.14) at 75 Torr to (0.30 ± 0.01) at 760 Torr. This dependence is characterized by the Stern-Volmer parameters Φλ=308 nm0 = (1.19 ± 0.34) and KSV = (1.22 ± 0.52) × 10-19 cm3 molecule-1. End products of the photodissociation of CF3CF2CHO were measured and quantified by FTIR spectroscopy. Furthermore, the rate coefficients for the OH + CF3CF2CHO reaction, k1, were determined as a function of temperature (T = 263-358 K) by PLP-LIF. At room temperature the rate coefficient is k1(T = 298 K) = (5.57 ± 0.07) × 10 -13 cm3 molecule-1 s-1, whereas the temperature dependence is described by k1(T) = (2.56 ± 0.32) × 10-12 exp{-(458 ± 36)/T} cm3 molecule -1 s-1. On the basis of our results, photolysis of CF 3CF2CHO in the actinic region could be an important removal process for CF3CF2CHO in the atmosphere. The formation of the primary products in the UV photolysis of CF3CF 2CHO is also discussed.
