- Polymer chemistry. Part V. γ-Ray induced telomerisation reactions involving 1,1-difluoroethene and hexafluoropropene
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Telomerisation reactions have been investigated for the alkenes 1,1-difluoroethene (5) and hexafluoropropene (3) with the telogens CF2Br2 (1), CF3CFBr2 (8) and CF3CBr3 (9), as a means of preparing telomers and co-telomers.The efficiency of chain transfer increases as 1 /= 8 9.Surprinsingly, co-telomerisations of 5 with 3 occurred more efficiently than the corresponding telomerisations with 5 alone.The effects of solvent are described. - Keywords: Telomerisation; γ-Ray induction; 1,1,-Difluoroethene; Hexafluoropropene; NMR spectroscopy; Mass spectrometry
- Chambers, Richard D.,Proctor, Lee D.,Caporiccio, Gerardo
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- A synthetic hexafluoro -1,3-butadiene method
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The invention relates to a method for synthesizing hexafluoro-1,3-butadiene, and belongs to the field of organic chemistry synthesis. The method comprises the following steps: carrying out gas phase bromination on tetrafluoroethane HFC-134a to generate dibromotetrafluoroethane CF3CBr2F, and carrying out a coupling reaction on dibromotetrafluoroethane, activated zinc powder and N,N-dimethyl formamide under the action of Fe to generate hexafluoro-1,3-butadiene. A solvent after the above reactions can be recycled. The method has the advantages of low price and convenient source of raw materials, high product yield, simple separation and purification of the above product, and easy industrial production.
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Paragraph 0034-0036; 0040; 0041
(2018/02/04)
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- Theoretical and experimental studies for preparing 1, 1-dibromo-1,2,2,2-tetrafluoroethane on gas-phase bromination of 1,1,1,2-tetrafluoroethane
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Efficient gas-phase bromination of 1, 1, 1, 2-tetrafluoroethane (HFC-134a) for the preparation of 1, 1-dibromo-1, 2, 2, 2-tetrafluoroethane (CF3CFBr2) has been described for the first time. A wide-ranging experimental investigation o
- Hu, Ruzhu,Zhang, Chengping,Qing, Feiyao,Quan, Hengdao
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- Pyrolytic decarboxylation of some derivatives of perfluorinated mono- and dicarboxylic acids
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Pathways of pyrolysis of perfluorinated carboxylic acids are considered in relation to the structure of the acids and reaction conditions. The reaction mechanism is discussed.
- Lebedev,Berenblit,Starobin,Gubanov
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p. 1640 - 1645
(2007/10/03)
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- Comparison of the Reactivity of CF3OX (X = Cl, F) with Some Simple Alkenes
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Reactions of CF3OX (X = Cl, F) with a variety of simple alkenes were carried out to compare the regio- and stereoselectivity of the additions to carbon-carbon double bonds.The observed addition products with CF3OCl are consistent with an electrophilic syn addition.With CF3OF the observed products indicate a different regioselectivity and low stereoselectivity, consistent with a free-radical addition.
- Johri, Kamalesh K.,DesMarteau, Darryl D.
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p. 242 - 250
(2007/10/02)
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