25291-17-2Relevant articles and documents
Parahydrogen-induced polarization transfer to 19F in perfluorocarbons for 19F NMR spectroscopy and MRI
Plaumann, Markus,Bommerich, Ute,Trantzschel, Thomas,Lego, Denise,Dillenberger, Sonja,Sauer, Grit,Bargon, Joachim,Buntkowsky, Gerd,Bernarding, Johannes
, p. 6334 - 6339 (2013)
Fluorinated substances are important in chemistry, industry, and the life sciences. In a new approach, parahydrogen-induced polarization (PHIP) is applied to enhance 19F MR signals of (perfluoro-n-hexyl)ethene and (perfluoro-n-hexyl)ethane. Unexpectedly, the end-standing CF3 group exhibits the highest amount of polarization despite the negligible coupling to the added protons. To clarify this non-intuitive distribution of polarization, signal enhancements in deuterated chloroform and acetone were compared and 19F-19F NOESY spectra, as well as 19F T 1 values were measured by NMR spectroscopy. By using the well separated and enhanced signal of the CF3 group, first 19F MR images of hyperpolarized linear semifluorinated alkenes were recorded. Copyright
RADICAL SYNTHESIS OF PERFLUORO-n-HEXYL-2-ETHANOL
Signe, E.,Blancou, H.,Benefice-Malouet, S.,Itier, J.
, p. 289 (1991)
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Fluorinated imidazolium salts having liquid crystal characteristics
Zama, Isabella,Gorni, Giacomo,Borzatta, Valerio,Cassani, Maria Cristina,Crupi, Cristina,Di Marco, Gaetano
, p. 749 - 753 (2016)
A family of fluorinated imidazolium salts showing liquid–crystalline properties in a wide temperature range was developed. These fluorinated ionic liquid crystals, due to their intrinsic hydrophobicity, high thermal stability and good conductivity, are suitable candidates to be used as electrolytes in electrochemical devices such as Dye Sensitized Solar Cell (DSSC) or lithium batteries.
Quaternary ammonium ionic liquids containing fluorous ponytails: Competitive alkylation and elimination reactions of I(CH2) nRf (n = 2, 3) with tertiary amines
Alhanash, Hana B.,Brisdon, Alan K.
, p. 152 - 157 (2013)
The formation of quaternary ammonium iodides possessing a fluorine-containing chain has been investigated. Reactions of tertiary amines, such as i-PrMe2N and n-BuMe2N with I(CH2) n(CF2)m(CF3), (n = 2, m = 5 and 7) do not cleanly yield the anticipated quaternary ammonium halide salt, instead elimination occurs and [RMe2NH]I (R = i-Pr, n-Bu) and CH 2CH(CF2)m(CF3) are formed. This is confirmed by the crystallographic characterisation of [n-BuMe2NH]I which is found to adopt a micellar-type arrangement in the solid state. Increasing the spacer chain-length to n = 3 does result in the desired quaternary ammonium halide salts, [RMe2N(CH2) 3(CF2)m(CF3)]I, (m = 3, 7). Quaternisation of MeBuN((CH2)3C8F17) with 1-iodooctane gave the asymmetric quaternary ammonium salt possessing a fluorinated alkyl chain, [n-BuMeOctN((CH2)3C 8F17)]I. Unlike in previously studied perprotio systems, low symmetry ammonium systems possessing long fluorinated chains do not result in room temperature ionic liquids.
Method for synthesizing perfluoroalkyl ethylene
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Paragraph 0028-0030, (2018/02/04)
The invention provides a method for synthesizing perfluoroalkyl ethylene. The method comprises the following steps: stirring and mixing perfluoroalkyl ethyl iodide and an inorganic base solution, adding a phase transfer catalyst, stirring and heating, performing elimination reaction at 0-100 DEG C, after the reaction is completed, cooling the reaction liquid to the room temperature, leaving to stand and layer, separating the liquid, and washing the organic phase at a lower layer, thereby obtaining the product perfluoroalkyl ethylene. The method is simple in operation process, gentle in reaction condition, simple in product purification, free of organic solvent, and low in cost and safe and environmentally friendly as the phase transfer catalyst can be recycled.
