75-38-7Relevant academic research and scientific papers
Insertion of difluorovinylidene into hydrogen and methane
Koetting, Carsten,Sander, Wolfram
, p. 8891 - 8897 (1999)
Insertion reactions of difluorovinylidene 1b into H2, CH4, and CD4 have been observed in argon matrixes at 20-40 K. These reactions are controlled by diffusion of trapped species rather than by activation barriers, indicat
H atom formation dynamics in the dissociation of CH3-CF2Cl (HCFC-142b) after UV and VUV laser photoexcitation
Brownsword,Hillenkamp,Laurent,Volpp,Wolfrum,Vatsa,Yoo
, p. 779 - 785 (1997)
Using the laser photolysis/laser-induced fluorescence (LIF) "pump-and-probe" technique, the dynamics of H atom formation in the photodissociation of CH3-CF2Cl (HCFC-142b) after excitation at 193 nm and the Lyman-α wavelength were studied under collision-free conditions in the gas-phase at room temperature. The H atoms produced were detected by (2p2P←1s2S)-LIF using tunable narrow-band Lyman-α laser radiation (λLα ≈ 121.6 nm) generated by resonant third-order sum-difference frequency conversion of pulsed dye laser radiation. In the VUV photodissociation experiments the Lyman-α laser radiation was used both to photodissociate the parent molecules and to detect the produced nascent H atoms via laser induced fluorescence. The following quantum yields ΦH for H atom formation were determined by a photolytic calibration method: ΦH(193 nm) = (0.06±0.02) and ΦH(Lα) = (0.53±0.12). From the measured H atom Doppler profiles the average H atom kinetic energy was determined to be ET(193 nm) = (51 ±10) kJ/mol and ET(Lα) = (72±4) kJ/mol, respectively.
Highly Active Cross-Metathesis of Tetrafluoroethylene with a Seven-Membered N-Heterocyclic-Carbene-Ruthenium Catalyst
Mori, Kenta,Akiyama, Midori,Inada, Ko,Imamura, Yutaka,Ishibashi, Yuichiro,Takahira, Yusuke,Nozaki, Kyoko,Okazoe, Takashi
supporting information, p. 20980 - 20987 (2021/12/14)
A drastic increase in catalyst turnover number (TON) was accomplished in the cross-metathesis of tetrafluoroethylene (TFE) and vinyl ethers. Under a continuous flow of TFE, catalyst Ru7, which contains a seven-membered N-heterocyclic carbene (NHC) ligand, reached a TON of 4100; this is 2 orders of magnitude higher than the highest hitherto reported value. Mechanistic studies revealed that the expanded NHC successfully destabilizes the stable intermediates with a difluorocarbene structure, which strongly promotes the reaction.
PRODUCTION METHOD OF ALKENE
-
Paragraph 0060-0065, (2019/10/16)
PROBLEM TO BE SOLVED: To provide a method of producing alkene, which is capable of further improving a yield of the alkene that is a reaction product, in a method of producing the alkene by contacting a gaseous alkane halide with an alkaline aqueous solution under the presence of a phase transfer catalyst. SOLUTION: A production method of alkene includes a step of contacting a liquid phase containing an alkaline aqueous solution and a nonaqueous solvent and a gaseous phase containing alkane halide soluble in the nonaqueous solvent under the presence of a phase transfer catalyst. SELECTED DRAWING: None COPYRIGHT: (C)2019,JPOandINPIT
EDTA-assisted hydrothermal synthesis of cubic SrF2 particles and their catalytic performance for the pyrolysis of 1-chloro-1,1-difluoroethane to vinylidene fluoride
Wang, Zhikun,Han, Wenfeng,Liu, Huazhang
, p. 1691 - 1700 (2019/03/19)
Uniform, free-standing and cubic SrF2 microparticles were successfully fabricated by a facile hydrothermal method with ethylenediaminetetraacetic acid (EDTA) as the chelating agent. The influences of preparation conditions, such as the pH value, amount of EDTA and hydrothermal time, on the formation of SrF2 crystals were investigated. The formation mechanism of cubic SrF2 particles was proposed based on the experimental results. Following calcination in air at 500 °C, SrF2 particles were evaluated as the catalyst for the pyrolysis of 1-chloro-1,1-difluoroethane (HCFC-142b, CH3CClF2) to vinylidene fluoride (VDF, CH2═CF2) at 350 °C and a space velocity of 600 h?1. The results indicate that SrF2 cubes exhibit high catalytic activity with a HCFC-142b conversion of about 70% and a selectivity to VDF of 80-87%. No significant deactivation was observed within the time on stream of 30 h. With the reaction temperature increased to 450 °C, the conversion of HCFC-142b is close to 94%, while the selectivity to VDF remains almost unchanged. Although the SrF2 catalyst prepared by the conventional precipitation method also shows high conversion, its selectivity to VDF is only around 50-70%. We suggest that the surface acidity and specific surface area play major roles in the catalytic performance. Compared with the temperatures for industrial manufacture of VDF of 650-700 °C, the SrF2 catalysts provide a promising pathway to produce VDF at much lower temperatures.
Exploiting the trifluoroethyl group as a precatalyst ligand in nickel-catalyzed Suzuki-type alkylations
Yang, Yi,Zhou, Qinghai,Cai, Junjie,Xue, Teng,Liu, Yingle,Jiang, Yan,Su, Yumei,Chung, Lungwa,Vicic, David A.
, p. 5275 - 5282 (2019/05/29)
We report herein the exploitment of the partially fluorinated trifluoroethyl as precatalyst ligands in nickel-catalyzed Suzuki-type alkylation and fluoroalkylation coupling reactions. Compared with the [LnNiII(aryl)(X)] precatalysts, the unique characters of bis-trifluoroethyl ligands imparted precatalyst [(bipy)Ni(CH2CF3)2] with bench-top stability, good solubilities in organic media and interesting catalytic activities. Preliminary mechanistic studies reveal that an eliminative extrusion of a vinylidene difluoride (VDF, CH2CF2) mask from [(bipy)Ni(CH2CF3)2] is a critical step for the initiation of a catalytic reaction.
METHOD FOR PRODUCING OLEFIN
-
Paragraph 0150-0154; 0168-0171, (2017/11/01)
A method for producing at least one olefin compound selected from the group consisting of a compound of formula (51), a compound of formula (52), a compound of formula (53), and a compound of formula (54), the method including reacting an olefin compound of formula (21) with a olefin compound of formula (31) in the presence of at least one metal catalyst selected from the group consisting of a compound of formula (11), a compound of formula (12), a compound of formula (13), a compound of formula (14), and a compound of formula (15).
Process for Making 2,3,3,3-Tetrafluoropropene and/or Vinylidine Fluoride
-
Paragraph 0049-0052, (2017/06/12)
Disclosed is a process for the formation of a mixture of the compounds 2,3,3,3-tetrafluoropropene (1234yf) and vinylidine fluoride, comprising pyrolyzing 1,1,2-trifluoro-2-trifluoro-methyl-cyclobutane under conditions effective to produce a reaction product comprising 1234yf and vinylidine fluoride in a 1234yf:vinylidine fluoride molar ratio of from about 0.5 to about 1.2.
Preparative Scale Demonstration and Mechanistic Investigation of a Visible Light-Mediated Radical Smiles Rearrangement
Douglas, James J.,Sevrin, Martin J.,Cole, Kevin P.,Stephenson, Corey R. J.
supporting information, p. 1148 - 1155 (2016/07/23)
A visible light-mediated Smiles rearrangement providing the difluoroethanol motif has been shown to reliably operate on preparative scale up to 100 g of starting material. Mechanistic investigation has revealed the reaction proceeds predominantly via a radical chain process that in some instances can be initiated via visible light or thermal activation in the absence of a photocatalyst. The reaction was demonstrated in continuous flow, with visible light and thermal initiation using a thiophene substrate relevant to pharmaceutical development.
Preparing method of vinylidene fluoride monomer with high purity and conversion, and apparatus therefor
-
Paragraph 0070 - 0073, (2016/10/07)
The present invention relates to a method and an apparatus for preparing vinylidene fluoride (VDF), a base monomer for manufacturing a polyvinylidene fluoride (PVDF) which is a kind of fluorinated resins. The apparatus and the method for preparing the VDF in accordance with the present invention have almost 100% of a conversion ratio and less than or equal to 0.1% of a CH_3F generation rate, which is difficult to be separated from the VDF, thereby easily preparing the high purity VDF. The method for preparing VDF comprises: a step of heating liquid 1-chloro-1,1-difluoroethane at 500-700anddeg;C, which is a temperature efore the pyrolysis to obtain a gas compound; mixing the gas compound with steam at 800-1,000anddeg;C; and inserting the mixed gas into a reactor at 800-1,000anddeg;C, and pyrolyzing the 1-chloro-1,1-difluoroethane.(10) Mass flow controller(21) Evaporator(22) Preliminary heater(23) High temperature heater(31) Steam boiler system(32) High temperature steam heater(40) Pyrolysis reactor(AA) Mixture including VDF and the like(BB) WaterCOPYRIGHT KIPO 2016
