624-72-6Relevant articles and documents
Method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane
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Paragraph 0020; 0022; 0024-0036; 0037; 0042-0049, (2020/05/30)
The invention relates to a method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane, belonging to the field of organic chemical synthesis. The method for synthesizing 1,2-difluoroethane and 1,1,2-trifluoroethane is characterized in that ethylene (with a molecular formula of CH2=CH2) and chlorine (with a molecular formula of Cl2) are heated under the action of a catalyst to generate a mixture of 1,2-dichloroethane and 1,1,2-trichloroethane, and the mixture and hydrogen fluoride (with a molecular formula HF) are heated under the action of a fluorination catalyst to generate 1,2-difluoroethane and 1,1,2-trifluoroethane. According to the method, raw materials are low in process and convenient to obtain; product separation and purification are simple; industrial production is easy;and industrial three-waste generation amount is low.
METHOD FOR PRODUCING 1-CHLORO-1,2-DIFLUOROETHYLENE
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Paragraph 0114, (2019/06/17)
The present invention provides a method for efficiently producing 1-chloro-1,2-difluoroethylene at low cost. Specifically, the present invention provides a method for producing 1-chloro-1,2-difluoroethylene, including the step of dehydrohalogenating chlorofluoroethane represented by formula (1) CFClX1—CHFX2 wherein X1 and X2 are different from each other and represent H, F, or Cl; and either X1 or X2 is H.
vic-difluorination of fluoroalkenes with xenon difiuoride: The effect of fluorine substituents on the reaction of alkenes with xenon difluoride
Tamura, Masanori,Quan, Heng-Dao,Sekiya, Akira
, p. 3151 - 3153 (2007/10/03)
vic-Difluorination proceeds by the reaction of fluoroalkenes with xenon difluoride to afford the corresponding fluorinated compounds. From the reaction with polyfluoroalkenes, the products are obtained in high to excellent yields. In this reaction, the fluorine atom substituent of alkene stabilizes the cation intermediate and suppresses side-reactions such as rearrangement.
Formation of β-Fluoroethyl Radical and Closed-Shell Products in Reactions of Photogenerated Fluorine Atoms with Ethene in Solid Argon
Misochko, Eugenii Ya.,Benderskii, Alexander V.,Wight, Charles A.
, p. 4496 - 4502 (2007/10/03)
Solid-state reactions of F atoms with ethene molecules were initiated by UV photolysis of dilute solutions of F2 and C2H4 in solid Ar.Products stabilized in the matrix were detected by infrared spectroscopy.Experiments were conducted at different temperatures in order to distinguish reactions in matrix-isolated F2-C2H4 complexes (at 16 K) from reactions of diffusing thermal F atoms (at 26 K).Comparison with the kinetic EPR data (Benderskii, V.A. et al.Mendeleev Commun. 1995, 6, 245) permitted the identification of the infrared spectrum of the β-fluoroethyl radical, which is the main product of the F + C2H4 reaction.Frequencies and absolute absorption intensities of the eight strongest infrared bands of β-C2H4F are reported.Photolysis of isolated F2-C2H4 complexes forms the closed-shell products C2H3F-HF and trans- and gauche-1,2-C2H4F2 with relative yields 0.6:0.2:0.2.Successive addition of two thermal F atoms to an isolated C2H4 molecule forms only the two conformers of 1,2-C2H4F2.The difference between product branching ratios of the latter reaction and the direct photoinduced reaction of F2-C2H4 complexes is qualitatively explained by the difference in size of the reaction cages and excess energies of the vibrationally excited intermediate (C2H4F2)*.
Reaction of diethylaminosulfur trifluoride with diols
Shellhamer, Dale F.,Anstine, D. Timothy,Gallego, Kelly M.,Ganesh, Brian R.,Hanson, Aaron A.,et al.
, p. 861 - 866 (2007/10/02)
Diethylaminosulfur trifluoride (DAST) reacts with dialcohols to give difluorides, sulfite esters or cyclic ethers depending on the number of carbons separating the two alcohol groups.Vicinal and 1,3-diols give large amounts of sulfite ester products while butane-1,4-diol gives almost exclusively the cyclic ether tetrahydrofuran.Terminal dialcohols longer than four carbons give primarily difluoride products.Semiempirical calculations indicate a preference for cyclic intermediates when four or less carbons separate the two alcohol moieties.These cyclic intermediates lead directly to the cyclic ethers and sulfite ester products.
FLUORINATION OF ETHYLENE BY HIGHER FLUORIDES OF COBALT, MANGANESE, AND CERIUM
Asovich, V. S.,Kornilov, V. V.,Maksimov, B. N.
, p. 97 - 100 (2007/10/02)
Fluorination of ethylene by higher fluorides of metals with variable valence (CoF3, CeF4, MnF3) is studied.Temperature dependence of the contents of fluorinated products are obtained.The mechanism of formation of significant amounts of 1,1,1,2-tetrafluoroethane in the reaction involving CoF3 and oligomers in the reaction involving CeF4, is proposed.
Reactions of Fluoromethyl Radicals
Cadman, Philip,Owen, Howell L.
, p. 3087 - 3106 (2007/10/02)
1,3-difluoroacetone was photolysed by itself and in the presence of either diethylketone or di-isopropylketone and the rates of the following reactions of fluoromethyl radicals were measured: (i) CH2F + CH2FCOCH2F, log10 (k/cm3 mol-1 s-1) = 11.10 -40000/2.303RT, (ii) CH2F + C2H5COC2H5, log10 (k/cm3 mol-1 s-1) = 10.71 -34050/2.303RT, (iii) CH2F + i-C3H7CO-i-C3H7, log10 (k/cm3 mol-1 s-1) = 11.18 -31550/2.303RT where R= 8.314 J mol-1 K-1.The disproportionation-combination ratios (Δ) for the following pairs of radicals were found to be Δ(CH2F, C2H5) = 0.047, Δ(CH2F, i-C3H7) = 0.210, Δ(i-C3H7, i-C3H7) = 0.55, Δ(C2H5, C2H5) = 0.146.
Vibrational Energy Transfer Probabilities of Highly Vibrationally Excited Fluoroethane and 1,2-Difluoroethane Molecules
Richmond, G.,Setser, D. W.
, p. 2699 - 2705 (2007/10/02)
The collisional loss of vibrational energy from chemically activated CH3CH2F and CH2FCH2F formed with average energies of 91 and 92.5 kcal mol-1, respectively, has been studied at 300 K with four bath gases, SF6, CO2, N2, and He.These chemically activated molecules were formed by combination of CH3 with CH2F and of CH2F with CH2F.The data cover an extensive range of pressure and permit the assignment of the mean energy transfer per collision and the form of the transition probability distribution.For He the (ΔEd) values were 1.0 kcal mol-1 with an exponential distribution for both C2H5F and C2H4F2.The (ΔEd) values for C2H5F or C2H4F2 were virtually the same and ranged from 2.0 to 5.0 kcal mol-1 for N2, CO2, and SF6; these transition probability distributions were of the Gaussian type (represented here by a stepladder model).The results for CH3CH2F and CH2FCH2F are compared to previous findings for CH3CF3 and CH2ClCH2Cl from this laboratory.The deactivation efficiency for SF6 is similar for all four molecules.However, the deactivation of CH3CF3 by N2 and CO2 is less efficient than for the other three molecules.The He deactivation efficiencies for the fluoroethanes are all similar, but substantially smaller than for C2H4Cl2.
