- Synthetic method of fluoro-oxacyclic olefin
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The invention discloses a synthesis method of fluoro-oxacyclic olefin. The method comprises the following steps of: performing selective fluorination reaction on chloro-oxacyclic alkane and a fluorination reagent to generate fluoro-chloro-oxacyclic alkane, and performing dehalogenation reaction on the fluoro-chloro-oxacyclic alkane under the action of a dehalogenation reagent to generate the target product fluoro-oxacyclic olefin. The method has the advantages of mild reaction conditions, high target product selectivity and the like.
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- 4. 5 - Difluoro - 2, 2 - di (perfluoro substituents) - 1, 3 - dioxo heterocyclic pentene synthetic method of compound (by machine translation)
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The invention discloses a 4, 5 - difluoro - 2, 2 - di (perfluoro substituents) - 1, 3 - dioxo heterocyclic pentene synthetic method of compound, specifically comprising: will be 4, 4, 5, 5 - tetrachloro - 2, 2 - di (perfluoro substituents) - 1, 3 - dioxolo compound first obtained by the dehalogenation reaction 4, 5 - dichloro - 2, 2 - di (perfluoro substituents) - 1, 3 - dioxo heterocyclic pentene, obtained by the fluorination reaction of the 4, 5 - difluoro - 2, 2 - di (perfluoro substituents) - 1, 3 - dioxo heterocyclic sym-methyl ethyl-ethylene class compounds. The present invention method effectively avoids the traditional process firstly carries out the fluorination reaction will be cis and trans of two isomers of the problems, eliminates the problem of reaction selectivity, greatly improves the reaction yield, and reduces the production cost, high industrial application feasibility, can improve the market competitiveness of the product. (by machine translation)
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Paragraph 0034; 0038-0040; 0065-0079
(2019/07/10)
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- Process for the preparation of halogenated 2,2-bis(trifluoromethyl)-1,3-dioxolanes
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A process for the production of a halogenated 2,2-bis(trihaloalkyl)-1,3-dioxolane of the formula STR1 wherein Rf is perhaloalkyl comprising a 2,2-bis(trihaloalkyl)-1,3-dioxolane in the presence of at least one of La, Ni, Sn, Zn, Fe, Co or Cu is disclosed. A process for the production of a halogenated 2,2-bis(trihaloalkyl)-1,3-dioxolane of the formula STR2 wherein X is Cl and each Y is independently Cl or F and wherein at least one Y is F, comprising fluorinating a halogenated 2,2-bis(trifluoromethyl)-4,4,5,5-tetrachloro-1,3-dioxolane in the presence of a catalyst which is preferably Cr2 O3 is disclosed. A process for the production of a 2,2-bis(trihaloalkyl)-1,3-dioxole of the formula STR3 comprising dehalogenating substantially only a corresponding trans-2,2-bis(perhaloalkyl)-4,5-difluoro-4,5-dichloro-1,3-dioxolane is disclosed.
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- Process for dechlorinating organic compounds
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Olefinic compounds are made from their vicinally chlorinated organic precursors by dechlorination with metallic magnesium in the presence of a mercury-based promoter, which may be a water-soluble mercury salt or metallic mercury, and of a catalytic amount of iodine. This process is particularly suitable for dechlorinating 4,5-dichloro-dioxolanes to the corresponding dioxoles. 4,5-Difluoro-2,2 bis(trifluoromethyl)-1,3-dioxole, which can be made by this process in a reproducible manner from 4,5-dichloro-4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxolane, is a useful monomer for making amorphous homopolymers and copolymers with tetrafluoroethylene, which are well suited for wire coating, finishes, and transparent glazing for corrosive service.
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