82785-14-6Relevant articles and documents
Preparation method of hexafluoro-1, 3-butadiene
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Paragraph 0029-0030; 0032-0033; 0035-0036, (2021/04/14)
The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of hexafluoro-1, 3-butadiene. The method comprises the following steps: cracking R22 used as a raw material to prepare TFE, preparing TFE and Br2 according to a certain ratio under certain conditions to generate dibromotetrafluoroethane, and reacting dibromotetrafluoroethane with TFE at certain temperature under the conditions of zinc powder and a DMF-toluene combined solvent to prepare the hexafluoro-1, 3-butadiene. After the reaction, a gas phase sample is collected and analyzed by GC chromatography, and the proportion of hexafluoro-1, 3-butadiene accounts for more than 85%. The method has the advantages of simple and accessible raw materials, low price, simple and safe technical preparation process, high product yield and the like.
PROCESS FOR PRODUCING FLUORINE COMPOUND
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Paragraph 0019-0026, (2020/03/05)
PROBLEM TO BE SOLVED: To provide a production process that can continuously produce 1,1,1,4,4,5,5,5-octafluoro-2-pentene (HFO1438 mzz) without using pure TFE having explosion risk. SOLUTION: Said production process comprises: a first step of pyrolyzing chlorodifluoromethane to yield a TFE crude product containing tetrafluoroethylene (TFE) and hydrogen chloride; a second step of subjecting the TFE crude product to hydrogen chloride removal, or hydrogen chloride removal and drying, to yield a TFE crude product from which hydrogen chloride is removed; and a third step of producing, in the presence of catalyst, HFO1438 mzz from the hydrogen chloride-removed TFE crude product and 1-3,3,3-tetrafluoropropene. SELECTED DRAWING: Figure 1 COPYRIGHT: (C)2020,JPOandINPIT
Direct defluorinative amidation-hydrolysis reaction of gem-difluoroalkenes with N,N-dimethylformamide, and primary and secondary amines
Wang, Biyun,Zhao, Xianghu,Liu, Qingyun,Cao, Song
, p. 8546 - 8552 (2018/12/01)
A novel and efficient method for the synthesis of arylacetamides by the reactions of gem-difluoroalkenes with N,N-dialkylformamides, and primary and secondary amines with the assistance of KOtBu and water was developed.