- Method for preparing fluorine-containing dihydric alcohol from fluorine-containing cycloolefin
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The invention discloses a method for preparing fluorine-containing dihydric alcohol from fluorine-containing cycloolefin. The method comprises the following steps: oxidizing fluorine-containing cycloolefin serving as a raw material by using an oxidizing agent and treating the fluorine-containing cycloolefin by using a strong alkali to generate a solid mixed salt containing corresponding fluorine-containing dicarboxylate, and then generating corresponding fluorine-containing binary acyl chloride under the action of an acylating chlorination reagent; and finally, enabling the fluorine-containing binary acyl chloride and a reducing agent to be subjected to a reduction reaction under the action of a solvent and a catalyst to obtain the corresponding fluorine-containing dihydric alcohol. The specific organic solvent and catalyst are adopted, and other conditions are matched, so that the fluorine-containing cycloolefin can be effectively promoted to generate corresponding fluorine-containing dihydric alcohol with high efficiency and high yield. The method has the advantages of easily available raw materials, simple process, convenience in operation, low cost and the like, and is suitable for large-scale production of fluorine-containing dihydric alcohol.
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Paragraph 0046
(2021/07/01)
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- Preparation method of fluorine-containing carboxylic acid
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The invention discloses a preparation method of fluorine-containing carboxylic acid. The method comprises the following steps: reacting fluorine-containing carboxylate used as a raw material with an acylating chlorination reagent to obtain a corresponding mixture of fluorine-containing acyl chloride and fluorine-containing anhydride, and hydrolyzing and drying the mixture of fluorine-containing acyl chloride and fluorine-containing anhydride to obtain high-purity fluorine-containing carboxylic acid. The method provided by the invention is suitable for post-treatment of fluorine-containing carboxylic acid prepared by a fluorine-containing olefin (monoolefine, diene, cycloolefin and the like) oxidation method, replaces the traditional strong acid acidification and ether continuous extractionprocess, and is simpler, more convenient and more applicable; and the method can also be used for recovering and purifying a fluorine-containing carboxylate emulsifier. The purity of the fluorine-containing carboxylic acid prepared by the method can reach 98% or above.
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Paragraph 0037-0038
(2020/07/12)
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- METHODS OF MAKING POLYFUNCTIONAL POLYFLUORINATED COMPOUNDS
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A method of making a polyfunctional polyfluorinated compound includes combining first components that include a polyfluorinated cyclic compound having 4 to 7 ring carbon atoms and at least one of osmium tetroxide, ruthenium tetroxide or a precursor thereof and forming a polyfluorinated dicarboxylic acid. Two of the ring carbon atoms of the polyfluorinated cyclic compound form a double bond or an epoxide. The precursor reacts with an oxidant to form ruthenium tetroxide. Methods also include converting the polyfluorinated dicarboxylic acid to a polyfluorinated dicarboxylic acid halide and converting the polyfluorinated dicarboxylic acid halide to other polyfunctional polyfluorinated compounds.
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- Synthesis and structural studies of polyphilic mesogens with central or terminal perfluoroalkyl chains
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Benzyl 4-iodoperfluorobutanoate was synthesized by partial pyrolysis of perfluoroglutaryl chloride in the presence of potassium iodide followed by esterification. This compound gives access to mesogenic molecules with alkyl chain, perfluoroalkyl central bridge, and biphenyl moieties. Segregation of these chemical fragments depends on the molecular design. The molecule with a central alkyl chain forms smectic A layers (123-145°C) with interdigitation of aliphatic and aromatic parts. In contrast, the smectic E phase is observed between 60 and 87°C when the perfluoroalkyl chain is in the center of the molecule. In this case, X-ray diffraction data are consistent with the presence of three sublayers differing in their chemical nature.
- Pensec,Tournilhac,Bassoul,Durliat
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- An ω-functionalized perfluoroalkyl chain: Synthesis and use in liquid crystal design
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A multiblock polyphilic compound incorporating a perfluoroalkyl spacer and associating groups at both extremities exhibits smectic A and smectic C mesophases.
- Pensec, Sandrine,Tournilhac, Francois-Genes
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p. 441 - 442
(2007/10/03)
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