- A method for the preparation of ethylene fluorine bromine
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The invention discloses a preparation method of 1-bromo-1-fluoroethylene.The preparation method comprises: two-stage bromination reaction and hydrogen bromide removal reaction; and has the characteristics of easily-available raw materials, low temperature of hot bromination reactions, high reaction yield, low cost, green, and environment-friendliness.
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Paragraph 0036; 0037
(2017/05/02)
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- Method for producing 1,1-dibromo-1-fluoroethane
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The present invention addresses the problem of providing a production method which enables 1,1-dibromo-1-fluoroethane to be produced in a simple and sustained manner. The present invention provides a method for producing 1,1-dibromo-1-fluoroethane, said method comprising step A of reacting 1,1-dibromoethylene with hydrogen fluoride to produce 1,1-dibromo-1-fluoroethane.
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Paragraph 0124; 0125
(2016/11/21)
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- METHOD FOR PRODUCING 1,1-DIBROMO-1-FLUOROETHANE
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An object of the present invention is to provide a production method that makes it possible to produce 1,1-dibromo-1-fluoroethane easily and sustainably. The present invention provides a method for producing 1,1-dibromo-1-fluoroethane, the method comprising step A of reacting 1,1-dibromoethylene with hydrogen fluoride to obtain 1,1-dibromo-1-fluoroethane.
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Paragraph 0089
(2016/08/29)
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- PRODUCTION METHOD OF MONOFLUOROETHYLENE COMPOUND
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PROBLEM TO BE SOLVED: To provide a synthesis method capable of giving a monofluoroethylene compound with a difluoroethylene compound as a material, under mild conditions, at ease and with high selectivity. SOLUTION: A production method of a monofluoroethylene compound represented by the formulas (1-1), (1-2) or (1-3) comprises a step of a difluoroethylene compound represented by the formulas (2-1), (2-2) or (2-3) with a compound represented by the formula (3): BX3, to obtain a monofluoroethylene compound represented by the formulas (1-1), (1-2) or (1-3). [R1 and R2 may be identically or differently H, an alkyl group, or a phenyl group which may be substituted with one or more substituent groups, or may be linked to each other to form a carbocyclic ring; and X is Cl or Br.] COPYRIGHT: (C)2015,JPOandINPIT
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Paragraph 0033
(2016/12/22)
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- Low-temperature 19F NMR spectroscopy of 1-fluoro-1-lithioethenes - Stability, shifts and unexpected coupling constants
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Half-lives and fluorine atom shifts of stabilized 1-fluoro-l-lithioethenes bearing hydrogen, fluorine, phenyl, and/or dimethylphenylsilyl groups in the β-positions have been determined by a low-temperature 19F NMR spectroscopy. Some 1-fluoro-1-lithioethenes displayed an exceptionally low value of the trans-3JFF coupling constant. Stereoselectivity of carbenoid formation, as well as an effect of configuration on the stability is discussed.
- Kvicala, Jaroslav,Hrabal, Richard,Czernek, Jiri,Bartosova, Ivana,Paleta, Oldrich,Pelter, Andrew
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p. 211 - 218
(2007/10/03)
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- Vibrational Excitation of the Reaction between Vinyl Bromide and Fluorine in Solid Argon
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A number of unsuccessful attempts to induce bimolecular addition reactions with selective vibrational excitation in cryogenic solids are reported here: 1,3-butadiene with Cl2, ClF, Br2, I2, and XeF2; vinyl chloride with F2.One system, vinyl bromide with fluorine in solid argon, did respond by showing reaction product growth upon laser excitation at 3116, 3098, 1849, 1808, and 1605 cm-1.Identification of reaction products suggests F2 addition across the double bond followed significantly by HF elimination but apparently without HBr elimination.Relative quantum yields display a monotonic dependence upon photon energy that is even more dramatic than that found earlier for the ethylene-fluorine reaction.Thus excitation of the C-H stretching modes either at 3116 or 3098 cm-1 is 102 times more effective than excitation at 1849 or 1848 cm-1 and 103 times more effective than at 1605 cm-1.
- Cesaro, Stella Nunziante,Frei, Heinz,Pimentel, George C.
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p. 2142 - 2147
(2007/10/02)
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