- A new telogen for telechelic oligomers of chlorotrifluoroethylene
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Elemental iodine is slightly soluble in liquid chlorotrifluoroethylene (CTFE) under autogenous pressure at room temperature.Exposure of a mixture of no more than 0.22 mol of iodine with 1 mol of CTFE in a borosilicate glass Carius tube to sunlight, an artificial UV source or to γ-radiation resulted in complete conversion of all the solid iodine initially to ICF2CFClI (1), which was isolated and characterised.The reaction is reversible, the equilibrium constant for I2 + CTFEliq ->/- 1 being ca. 0.22.Thus with light or heat, isolated unconfined 1 reverted to iodine and CTFE.Additional irradiation of 1 confined with excess liquid CTFE led to the irreversible formation of telomers I(CF2CFCl)nI (2).The average value of n in the distribution of telomers increased with dose giving liquids (n = 2-4) or greases (n = 2-10) which were much more stable than 1.Upon bromination, individual telomers in the series Br(CF2CFCl)nBr were isolated and characterised. - Keywords: Telogens; Telechelic oligomers; Chlorotrifluoroethylene; NMR spectroscopy; Mass spectrometry; IR spectroscopy
- Chambers, Richard D.,Greenhall, Martin P.,Wright, Anthony P.,Caporiccio, Gerardo
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Read Online
- Method for synthesizing 4 -halo -1, 1 and 2 -trifluoro -1 -butene (by machine translation)
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The invention discloses a method for synthesizing 4 -halo -1, 1 and 2 -trifluoro -1 -butene. , Polyhaloethane is synthesized by reaction of chlorotrifluoroethylene with halogen, and then polyhalogenated ethane is reacted with ethylene under the action of a catalyst to synthesize polyhalogenated butane, and finally, 4 - halogenated -1, 1 and 2 -trifluoro -1 -butene are dehalogenated under the action of a reducing agent. The method has the characteristics of simple synthesis method, high product purity and low preparation cost. (by machine translation)
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Paragraph 0008
(2020/06/20)
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- Oligomers of vinyl phosphonic acid obtained by radical polymerization in the presence of halogenated chain transfer agent
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Two halogenated compounds, ICFCICF2Cl et BrCF 2CFCl-Br, were synthesized and characterized and were further used as chain transfer agents (CTAs) for the radical polymerization of vinyl phosphonic acid (VPA). Only BrCF2CFClBr was efficient CTA towards VPA as the chain transfer constant CT value of 1 was evaluated. This value clearly demonstrates that the chain-end of each VPA polymeric chain is BrCF 2CFCl group, which will allow to perform a dehalogenation from this group, leading to a new VPA macromonomer. Hence, VPA telomere were synthesized with Mn values ranging from 1800 to 6700 g/mol.
- Tayouo, Russell,David, Ghislain,Ameduri, Bruno,Boutevin, Bernard
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experimental part
p. 545 - 548
(2010/09/04)
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- CHEMICAL PRODUCTION PROCESSES AND SYSTEMS
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Chemical production processes are provided that include reacting a metal comprising olefin to form a conjugated olefin; reacting a heterohalogenated olefin to form a conjugated olefin; reacting a halogenated alkane to form a conjugated olefin; and/or reacting a hydrohalogenated olefin to form a conjugated olefin. Chemical production systems are also provided that can include: a first reactant reservoir configured to house a perhalogenated olefin; a second reactant reservoir configured to house a catalyst mixture; a first reactor coupled to both the first and second reservoirs, the first reactor configured to house a metal-comprising mixture and receive both the perhaloganated olefin form the first reactant reservoir and the reactant mixture from the second reactant reservoir; and a product collection reservoir coupled to the first reactor and configured to house a conjugated olefin.
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Page/Page column 16
(2008/06/13)
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- Preparation of polyhaloalkanes
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The present invention relates to a process for preparing polyhaloalkanes and to their use for preparing intermediates for agrochemicals and pharmaceuticals.
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- Bromosulphonated fluorinated cross-linkabke elastomers based on vinylidene fluoride having low t9 and processes for their preparation
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Compounds corresponding to formula (I) F2C═CFX(CY2)nBr??(I) in which: X represents an atom of oxygen or no atom; Y represents an atom of hydrogen or of fluorine; and n is a whole natural number ranging from 0 to 10 inclusive, excluding bromotrifluoroethylene, 3-bromo-perfluoropropene, 4-bromo-1,1,2,-trifluorobutene, 4-bromo-perfluorobutene-1 and perfluoro(2-bromo-ethylvinyl ester), and their use in the synthesis of fluorinated copolymers then in the synthesis of homosulphonated fluorinated elastomers, exhibiting a low glass transition temperature.
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- Synthesis and polymerisation of fluorinated monomers bearing a reactive lateral group. Part 5 - Radical addition of iodine monobromide to chlorotrifluoroethylene to form a useful intermediate in the synthesis of 4,5,5-trifluoro-4-ene-pentanol
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The synthesis of the new halogenated alcohol BrCF2CFClCH2CHICH2OH as a precursor of 4,5,5 trifluoro-4-ene pentanol F2C=CFC3H6OH is based on a two-step process. First, the radical addition of iodine monobromide to chlorotrifluoroethylene (CTFE) led to the expected BrCF2CFClI (I) and ICF2CFClBr (II), but also to BrCF2CFClBr (III) and ICF2CFClI (IV), the amount of which determined by 19F NMR depended on the reaction conditions: by feeding CTFE into IBr continuously or in batches; photochemical or thermal initiations, and with various initial [IBr]0/[CTFE]0 molar ratios. In most cases, isomer (I) was mainly produced. The second step concerned the addition of such a mixture to allyl alcohol yielding the polyhalogenoalcohol with a quantitative conversion of (I). The reactivity of different halogeno end-groups of these isomers toward the allyl alcohol was discussed. Reduction of the iodine atom into hydrogen and the halogenated alcohol was accompanied by that of the bromine atom leading to BrCF2CFClC3H6OH and HCF2CFClC3H6OH (V). Dehalogenation of the former alcohol in the presence of zinc led to F2C=CFC3H6OH while dehydrochlorination of (V) into trifluorovinyl hydroxy monomers was achieved in the presence of potassium hydroxide but in poor yields. Strategies starting from the radical additions of iodine monochloride and of iodine monobromide were compared showing that the former led to better overall yields of trifluorovinyl alcohol than the latter.
- Ameduri,Boutevin,Kostov,Petrova
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p. 117 - 127
(2007/10/03)
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- Process for preparing perhalogenated olefins
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The invention relates to a process for preparing perhalogenated olefins which comprises reacting a perhalogenated alkane, having at least one atom of a halogen different from fluorine, with a tris-dialkylamino phosphine at temperature not higher than 60° C.
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- Process for preparing perhalogenated olefins
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The invention relates to a process for preparing perhalogenated olefins which comprises reacting a perhalogenated alkane, having at least one atom of a halogen different from fluorine, with a tris-dialkylamino phosphine at temperature not higher than 60°C.
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- DETERMINATION OF HEATS OF VAPORIZATION AND SOME OTHER THERMODYNAMIC QUANTITIES FOR TRHEE FLUORINATED HALOGEN ETHANES
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Some thermodynamic properties were investigated for three fluorinated halogen ethanes: 1-bromo-2-chloro-1,1,2-trifluoroethane, 1,2-dibromotetrafluoroethane and 1,2-dibromo-1-chlorotrifluoroethane.The temperature dependence of heats of vaporization, saturated vapour pressures, densities and refractive indices was measured at two temperatures.On the basis of the experimental quantities obtained, the standart heats of vaporization and the cohesive and internal energies of vaporization in their dependence on temperature were determined.
- Majer, Vladimir,Svoboda, Vaclav,Posta, Antonin,Pick, Jiri
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p. 817 - 822
(2007/10/02)
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