40 results about "Telomerization" patented technology

The invention relates to the technical field of organic chemical synthesis, and particularly discloses a method for producing hexafluorobutadiene, a continuous production system and application thereof. The method for producing hexafluorobutadiene comprises the following steps: (1) bromination reaction: reacting tetrafluoroethylene with liquid bromine to generate dibromotetrafluoroethane; (2) telomerization reaction: reacting the dibromo tetrafluoroethane with tetrafluoroethylene under the action of a catalyst to generate dibromo octafluorobutane; the catalyst is cuprous bromide; and (3) elimination reaction: reacting the dibromo octafluorobutane under the action of a Grignard reagent to generate hexafluorobutadiene. The method provided by the invention has the advantages of simple process, easily available raw materials, high production efficiency, continuous production, low production cost and industrial mass production value.

The invention discloses a method for preparing 1-chloro-2, 3, 3-trifluoropropene through resource utilization of 1, 1, 2-trifluoroethane, which comprises the following steps: (1) dehydrofluorination: 1, 1, 2-trifluoroethane is subjected to a dehydrofluorination process under the action of a gas-phase dehydrofluorination catalyst to obtain 1, 2-difluoroethylene; (2) telomerization: under the combined action of the prefluorinated telomerization catalyst, the accelerant and the polar aprotic solvent, telomerization is performed on the 1, 2-difluoroethylene and the dichlorofluoromethane to obtain 3, 3-dichloro-1, 1, 2-trifluoropropane; and (3) a dehydrochlorination step: carrying out dehydrochlorination on the 3, 3-dichloro-1, 1, 2-trifluoropropane to obtain the 1-chloro-2, 3, 3-trifluoropropene. The method has the advantages of easily available raw materials, high product selectivity, high purity, easiness in separation, suitability for industrial application and the like.

Provided is a method for producing 2,7-octadien-1-ol, including a step (1) of feeding a raw material mixture liquid containing butadiene, a Group 6 to 11 transition metal catalyst containing a Group 6 to 11 transition metal, a tertiary phosphorus compound, an amine compound, and water to a telomerization reactor, and a step (2) of reacting butadiene and water in a carbon dioxide atmosphere in the telomerization reactor to obtain a reaction mixture liquid containing 2,7-octadien-1-ol, in which a residence time of the raw material mixture liquid in the telomerization reactor is 1.3 to 3.0 hours.

A method for producing a motor fuel includes telomerizing ethylene and an alcohol mixture comprising ethanol under suitable conditions to form a mixture comprising C5-C8 alcohols; dehydrating the mixture comprising the C5-C8 alcohols to form a mixture comprising C5-C8 olefins; oligomerizing the C5-C8 olefins to form C10-C24 olefins; hydrogenating the C10-C24 olefins to form C10-C24 paraffins; and isolating a fraction of the C10-C24 paraffins. The isolated fraction may be used to form a motor fuel selected from gasoline, kerosene, diesel, and mixtures thereof.

The application relates to the technical field of fluorine-containing iodoalkane preparation, in particular to a preparation method of high-carbon-number diiodoperfluoroalkane, which comprises the following steps: reacting tetrafluoroethylene and elemental iodine to generate diiodotetrafluoroethane; and under the action of a catalyst, the diiodotetrafluoroethane is subjected to telomerization reaction with tetrafluoroethylene to generate high-carbon-number diiodoperfluorobutane and diiodoperfluorohexane; and the catalyst is a metal nickel catalyst supported on silicon dioxide. The metal nickel catalyst supported on silicon dioxide is used to make the diiodotetrafluoroethane and the tetrafluoroethylene subjected to telomerization reaction to obtain diiodoperfluoroalkane with higher carbon number. The application has the advantages of simple process, low reaction temperature and the like, and can significantly improve the yield of diiodoperfluorobutane and diiodoperfluorohexane.

The present application discloses a full-process continuous process for synthesizing 1,1,1,3,3-pentafluoropropane, including a telomerization reaction: vinyl chloride, carbon tetrachloride, catalyst 1 and a cocatalyst are added to a pre-reactor mixer for premixing to obtain mixture 1, mixture 1 is pumped into a reactor system for telomerization reaction to obtain the material of the telomerization reaction, the material of the telomerization reaction is continuously pumped out and separated to obtain R240fa, and the separated vinyl chloride, carbon tetrachloride, catalyst 1, cocatalyst and unseparated R240fa are returned to the pre-reactor mixer for continuous reaction; a fluorination reaction: the R240fa, chlorine gas and anhydrous hydrogen fluoride obtained from the telomerization reaction are continuously introduced into a fluorination reaction kettle containing activated catalyst 2 for fluorination reaction to obtain a fluorination reaction product, the fluorination reaction product is separated to obtain 1,1,1,3,3-pentafluoropropane, and the remaining product after separating 1,1,1,3,3-pentafluoropropane is returned to the fluorination reaction kettle for continuous reaction.

The present application provides a method for preparing a 2,7-octadienyl compound, relating to the field of homogeneous catalysis and organic synthesis technology. In the present application, a conjugated diene having at least two conjugated double bonds is subjected to a telomerization reaction with a nucleophilic reagent under the action of a catalyst and a reaction promoter to obtain a 2,7-octadienyl compound. A small amount of reaction promoter is added to the preparation method. The reaction promoter not only has a good synergistic effect with the catalyst, but also can significantly improve the stability of the reaction intermediate, reduce the amount of organophosphine ligand, reduce the catalyst cost, and can also accelerate the rapid circulation of the active components zero-valent palladium and divalent palladium in the catalyst, improve catalytic efficiency, reduce the occurrence of side reactions, and effectively improve reaction selectivity.

The invention discloses a method for preparing 1-methoxy-2, 7-octadiene, belongs to the technical field of chemical engineering, and solves the problem that the reaction efficiency of corresponding preparation reaction in the prior art is not ideal enough. The method comprises the following steps: in an oxygen-free environment, dissolving a palladium source and a palladium source ligand in methanol, adding acetic acid as a stabilizer, and stirring at normal temperature to obtain a catalyst prefabricated solution; and sequentially adding methanol, a catalyst and 1, 3-butadiene into the catalyst prefabricated liquid, carrying out telomerization reaction under an anaerobic condition, cooling to room temperature after the reaction is finished, and releasing pressure to obtain the 1-methoxy-2, 7-octadiene. The palladium catalytic system obtained by the preparation method is high in 1, 3-butadiene conversion rate, better in ligand selectivity and lower in catalyst concentration, and can be used for industrial production of 1-MOD.

A method for producing 2,7-octadien-1-ol, that includes feeding a raw material mixture liquid containing butadiene, a Group 6 to 11 transition metal catalyst containing a Group 6 to 11 transition metal, a tertiary phosphorus compound, an amine compound, and water to a telomerization reactor, and reacting butadiene and water in a carbon dioxide atmosphere in the telomerization reactor to obtain a reaction mixture liquid containing 2,7-octadien-1-ol, in which a residence time of the raw material mixture liquid in the telomerization reactor is 1.3 to 3.0 hours.

The invention discloses a method for preparing hexafluoropropane, and relates to the technical field of new material preparation, and the method comprises the following steps: S1, preparing a solid catalyst: taking a porous material formed by mixing activated carbon and montmorillonite, sequentially carrying out acid washing and alkali washing, then activating in a mixed salt aqueous solution of chlorate and carbonate, drying, roasting, then mixing with modified vermiculite, and carrying out solid-liquid separation to obtain the solid catalyst; then adding a chromium trichloride solution, carrying out ultrasonic impregnation, and drying, so as to obtain a solid catalyst; s2, telomerization section: carrying out telomerization reaction on the raw materials vinylidene chloride and carbon tetrachloride under certain operation conditions; the hexachloropropane is obtained; s3, fluorination section: continuously adding hexachloropropane and anhydrous hydrogen fluoride into a fluorination reaction kettle, and carrying out fluorination reaction in the presence of a solid catalyst; the hexafluoropropane is obtained. The product prepared by the method is high in purity and high in yield.

The invention provides a method for preparing fluoroalkanol, and belongs to the field of organic synthesis. In the method for preparing the fluoroalkanol, provided by the invention, a compound H (CF2CF2) 4CH2OH is prepared through telomerization reaction of tetrafluoroethylene and methanol in the presence of an initiator, a product distribution regulator and an acid-binding agent, the product distribution regulator is an organic salt of a rare earth metal, and when the reaction is started, the partial pressure of tetrafluoroethylene in a reaction container is 1.0-1.6 MPa, and the partial pressure of tetrafluoroethylene in the reaction container is 1.0-1.6 MPa. The reaction temperature is 110-150 DEG C; as the product distribution regulator and the acid-binding agent are added in the reaction, not only can the overall conversion rate of the reaction be effectively improved, but also the selectivity of the target compound H (CF2CF2) 4CH2OH can be improved, and the target compound can be obtained with higher yield.

The invention provides a preparation method of a 2, 7-octadienyl compound, and relates to the technical field of homogeneous catalysis and organic synthesis.The preparation method comprises the step that conjugated diene with at least two conjugated double bonds and a nucleophilic reagent are subjected to telomerization reaction under the action of a catalyst and a reaction accelerant to obtain the 2, 7-octadienyl compound. According to the preparation method, a small amount of reaction accelerant is added, the reaction accelerant has a good synergistic effect with the catalyst, the stability of a reaction intermediate can be remarkably improved, the use amount of an organic phosphine ligand is reduced, the cost of the catalyst is reduced, rapid circulation of active components, namely zero-valent palladium and divalent palladium in the catalyst can be accelerated, and the yield of the catalyst is increased. The catalytic efficiency is improved, side reactions are reduced, and the reaction selectivity is effectively improved.

The application provides a preparation method of alpha, omega-diiodo perfluoroalkane, taking dibromotetrafluoroethane and tetrafluoroethylene as raw materials, ultraviolet light as a catalyst, performing photocatalytic telomerization reaction to generate dibromoperfluoroalkane; in a polar aprotic solvent, the dibromoperfluoroalkane and sodium iodide or potassium iodide perform substitution reaction at 50-100 DEG C, and alpha, omega-diiodo perfluoroalkane is obtained through separation and purification. The reaction condition in the preparation process is mild, a high-temperature and high-pressure environment is not needed, safety is high, purification is easy, the purity and selectivity of the obtained alpha, omega-diiodo perfluoroalkane are high, and the problems of poor selectivity of the product, low raw material utilization rate and great environmental pollution caused by iodine in the preparation process of diiodoperfluoroalkane are solved.

The invention discloses a triaryl phosphine ligand as well as a preparation method and application thereof, belongs to the technical field of chemical engineering, and solves the problem that the action efficiency of a catalyst is not ideal enough in a reaction for generating 1-methoxy-2, 7-octadiene through telomerization of 1, 3-butadiene and methanol catalyzed by palladium in the prior art. The preparation method comprises the following steps: in a water-free and oxygen-free environment, dissolving brominated benzotrifluoride in diethyl ether, dropwise adding n-butyllithium at the temperature of-5 to 5 DEG C, and fully stirring to obtain a lithium reagent; the preparation method comprises the following steps: adding chlorodiaryl phosphorus into a lithium reagent, mixing and stirring, heating to 20-30 DEG C in stages, continuously stirring and reacting under an anaerobic condition, and recrystallizing to obtain the triarylphosphine ligand. The palladium catalytic system obtained by the preparation method is high in 1, 3-butadiene conversion rate, better in ligand selectivity and lower in catalyst concentration, and can be used for industrial production of 1-MOD.

The invention provides a method for continuously preparing hexafluorobutadiene in a gas phase, which comprises the following steps: by taking chlorotrifluoroethylene as an initial raw material, carrying out a gas-phase catalytic telomerization reaction to obtain an intermediate 1, 2-dichlorohexafluorocyclobutane, then carrying out a gas-phase catalytic dichloro-removal reaction to obtain an intermediate hexafluorocyclobutene, and finally, carrying out a gas-phase catalytic telomerization reaction to obtain the hexafluorobutadiene. And finally, carrying out gas-phase catalytic isomerization reaction to obtain the target product hexafluorobutadiene. The method for synthesizing hexafluorobutadiene has the advantages of high one-way yield, high selectivity, short reaction time, easy realization of gas phase independent circulation continuous reaction, and high synthesis efficiency.

The invention provides a method for preparing hexafluorobutadiene through two-step gas-phase continuous reaction, which comprises the following steps: gas-phase telomerization reaction: taking chlorotrifluoroethylene as a raw material, and carrying out gas-phase telomerization chain-forming reaction in the presence of a telomerization catalyst to obtain 3, 4-dichlorohexafluoro-1-butene; the reaction conditions are as follows: the reaction pressure is 0.1-1.5 MPa, the reaction temperature is 300-600 DEG C, and the contact time is 0.5-100 seconds; the method comprises the following steps: carrying out gas-phase dichlorination reaction, namely carrying out dichlorination reaction on 3, 4-dichlorohexafluoro-1-butene serving as a raw material in the presence of a dechlorination catalyst and hydrogen; the reaction conditions are as follows: the molar ratio of the hydrogen to the 3, 4-dichlorohexafluoro-1-butene is (1-3): 1, the reaction pressure is 0.1-1.5 MPa, the reaction temperature is 200-400 DEG C, and the contact time is 0.5-100 seconds. The method for synthesizing hexafluorobutadiene has the advantages of high one-way yield, high selectivity, short reaction time, easy realization of gas phase independent circulation continuous reaction, and high synthesis efficiency.

This invention belongs to the field of silicone oil preparation technology, specifically relating to a production line and process for inert high-boiling silicone oil, comprising, in sequence: a hydrolysis reaction unit, a dechlorination reaction unit, a dehydrogenation-neutralization reaction unit, a polymerization reaction unit, and an evaporation unit. The production line and process for inert high-boiling silicone oil described in this invention have the advantages of simple and controllable production process, and suitability for continuous industrial production, enabling the production of high-boiling silicone oil with low chloride ion content, no hydrogen content, and controllable viscosity.

The application provides a method for preparing dimethyl silicone oil, which comprises mixing low-molecular-weight hydroxyl-terminated polydimethylsiloxane, a methyl end-capping agent, a polycondensation telomerization agent and a phosphorus nitride catalyst, and sequentially performing normal-pressure polycondensation telomerization and negative-pressure polycondensation telomerization to obtain dimethyl silicone oil. The polycondensation telomerization agent added in the preparation method can effectively control the polycondensation rate, and dimethyl silicone oil with different viscosities can be prepared, while the viscosity peak caused by polycondensation is avoided, and the advantage is more obvious, especially for high-viscosity products. The dimethyl silicone oil prepared by the preparation method has the advantages of low ring content, especially low content of large-ring by-products, and low metal ion content, so that the application scenarios are wider. In addition, the polycondensation time of the preparation method is short, the quality is improved, the production capacity is improved, and the requirement for equipment is low.

The application provides a method for preparing hexafluoropropylene oxide dimer and pentafluoropropionic acid through photocatalytic telomerization, and relates to the technical field of organic synthesis, and comprises the following steps: performing photocatalytic reaction on a rectification residue of hexafluoropropylene oxide dimer to continuously pyrolyze and telomerize, so that hexafluoropropylene oxide dimer and pentafluoropropionic acid are obtained; the components of the rectification residue include hexafluoropropylene oxide polymer CF3CF2CF2O[CF(CF3)CF2O] n CF(CF3)COF, n=0~5; the catalyst used in the photocatalytic reaction comprises alkali metal fluoride loaded on activated carbon. The application resources the hexafluoropropylene oxide polymer to hexafluoropropylene oxide dimer and pentafluoropropionic acid through telomerization, so that by-product waste liquid is fully resourced, and the application has the advantages of green economy; meanwhile, the reaction condition is mild, the conversion rate is high, the yield is high, the time is short, and the application is easy to industrialize.

A method for preparing 2,3,3,3-tetrafluoropropene by a two-step method, the method comprising: A1. a telomerization step: preparing 3-chloro-1,1,1,2-tetrafluoropropane by pressure telomerization reaction of monofluoromonochloromethane and trifluoroethylene under the action of a telomerization catalyst; the telomerization catalyst is a Lewis acid catalyst or a mixed catalyst of a Lewis acid catalyst and dichloromethane; A2. a dehydrochlorination step: 3-chloro-1,1,1,2-tetrafluoropropane is dehydrochlorinated under the catalysis of activated carbon to obtain 2,3,3,3-tetrafluoropropene. The present application has the advantages of simple process, high product selectivity, mild reaction conditions and the like.

The invention discloses a preparation method of 3, 3-dichloro-1, 1, 2-trifluoropropane, and the preparation method comprises the following steps: 1, 2-difluoroethylene and dichlorofluoromethane are subjected to a one-step telomerization reaction under the combined action of a prefluorinated telomerization catalyst, an accelerant and a polar aprotic solvent to obtain 3, 3-dichloro-1, 1, 2-trifluoropropane, and the 3, 3-dichloro-1, 1, 2-trifluoropropane is subjected to a one-step telomerization reaction to obtain 3, 3-dichloro-1, 1, 2-trifluoropropane. The catalyst is a halogenated alkane pre-fluorinated Lewis acid catalyst, the accelerant is at least one of trichloromethane, difluorochloromethane and fluorochloromethane, and the polar aprotic solvent is at least one of N, N-dimethylformamide, N, N-dimethylacetamide, acetonitrile, dimethyl sulfoxide and N-methyl pyrrolidone. Chlorofluorocarbon carbon chain growth is realized through one-step telomerization, a target product is obtained, and the method has the advantages of being simple in process, low in cost, high in product selectivity, suitable for industrial application and the like.

The invention relates to the technical field of catalysts, in particular to a polycentric metal multi-quaternary ammonium salt bifunctional porphyrin complex catalyst based on a cyclophosphazene framework and a preparation method and application thereof.The catalyst comprises the cyclophosphazene framework, the cyclophosphazene framework is connected with a metalloporphyrin complex LA and a quaternary ammonium salt group LB through phosphorus atoms, according to the catalyst, the distance between a reaction active center and a cocatalyst is shortened and fixed, the reaction activity is greatly improved, the catalyst is particularly suitable for the reaction of propylene oxide and carbon dioxide, and the catalyst has excellent catalytic activity (TOF / h <-1 >) which can reach 106 orders of magnitude when being used for telomerization synthesis of carbon dioxide-based polyol. The number of metal centers of the complex and the number of quaternary ammonium salts can be accurately adjusted, so that catalysts with different reaction activities are obtained. The complex can be used for catalytically preparing polyhydric alcohols with ultrahigh activity while maintaining high selectivity at a high temperature.

The present invention provides a method for preparing 2,7-octadienol-1 by the telomerization of butadiene. The method utilizes a palladium catalyst, a water-soluble triphenylphosphine compound as a ligand, a ketoxime-based silane as a phase transfer catalyst, and a nitrogen-containing heterofluorene compound as a palladium stabilizer. Using this method, a butadiene conversion rate of 85% or higher, a 2,7-octadienol selectivity of 95% or higher, and a single-batch Pd atom recovery rate exceeding 95% are achieved in a reaction time of 1 hour.

The application belongs to the field of organic silicon synthesis, and particularly relates to a preparation method of low ring body and ultra-low viscosity dimethyl silicone oil, wherein the viscosity of the dimethyl silicone oil is less than or equal to 5 cSt; the preparation method comprises the following steps: firstly, placing alpha, omega-dihydroxyl polysiloxane linear body, a polymerization inhibitor and a catalyst in a vacuum condition to perform a condensation dehydroxylation reaction, so as to obtain a prepolymer; then, adding an end-capping agent to the prepolymer to perform an equilibrium telomerization; after the reaction is completed, adding a terminating agent and a catalyst quenching agent, so as to obtain the ultra-low viscosity dimethyl silicone oil. The preparation method is simple in process, mild in preparation condition, easy to realize, free of waste water and waste salt, green and environment-friendly, and suitable for industrialized production.

This invention discloses a metal-carbon composite catalyst and method for the continuous preparation of 1,1,1,3-tetrachloropropane. The main component of the catalyst is Cu-Ni-Cl-C / Fe, and the catalyst preparation process includes four steps: mixing, carbonization, displacement, and loading. The catalyst of this invention can efficiently catalyze the telomerization reaction of carbon tetrachloride and ethylene, generating the target product 1,1,1,3-tetrachloropropane with high selectivity. The catalyst exhibits stable performance, maintaining good catalytic effect even after five repeated uses. The conversion rate of carbon tetrachloride and ethylene reaches over 95%, and the selectivity of 1,1,1,3-tetrachloropropane is greater than 98.5%.

The invention belongs to the field of organosilicon waterproofing, and discloses an organic fluorine-free fabric waterproofing agent and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out hydrolytic condensation reaction on silicate ester, an epoxy silane coupling agent, tetramethyl dihydrodisiloxane and a long-chain alkyl silane coupling agent under an acidic condition to obtain a prepolymer I; (2) carrying out telomerization on a methyl siloxane ring body, a methyl vinyl siloxane ring body and pentamethyl-vinyl disiloxane in the presence of a catalyst to obtain end-side vinyl silicone oil; (3) carrying out addition reaction on the prepolymer I and end-side vinyl silicone oil under catalysis to obtain a prepolymer II; (4) reacting the prepolymer II with an amine compound to obtain a prepolymer III; and (5) reacting the prepolymer III with polyurethane to obtain the waterproof agent. According to the invention, a polyurethane material is combined on the basis of an organic silicon material, the non-fluorine fabric waterproof agent is obtained by using silicon teflon, and the prepared waterproof agent does not contain fluoride, has excellent waterproof performance, is green and environment-friendly, and is suitable for large-scale application.

This invention belongs to the field of organic synthesis technology, specifically relating to a method for preparing 1,1,3,3,3-pentafluoropropylene. This invention designs a perovskite-type catalyst doped with noble metals or synergistically constructs a supported metal catalyst. Through a collaborative mechanism where the support provides strong Lewis acidity and fluorination activity, while the noble metal provides dehydrogenation activity, the interfacial interactions and reaction matching of the catalytic system are precisely controlled. This allows for highly efficient catalysis of the integrated "telomerization-fluorination-dehydrogenation" reaction of vinyl chloride (CHCl=CH2), carbon tetrachloride (CCl4), and hydrogen fluoride (HF). The reaction can be carried out continuously in the same reactor and with the same synergistic catalyst system, without the need to change equipment or catalysts, resulting in outstanding production efficiency. Furthermore, the selectivity and controllability of the reaction conditions are significantly optimized, enabling high-selectivity and high-yield synthesis of the target product under mild conditions. Simultaneously, it achieves the resource utilization of industrial waste carbon tetrachloride, representing a major technological breakthrough in terms of raw material cost, process simplification, and environmental friendliness.

This invention belongs to the field of organosilicon chemical synthesis technology, and discloses a segmented preparation method for low-cyclic polysiloxanes and a segmented polymerization reactor. The method includes: raw material pretreatment, segmented polymerization reaction, termination and purification, and post-treatment. The segmented polymerization reaction is carried out in an integrated segmented polymerization reactor, and includes, in sequence: 1) initiation of polycondensation under ultrasonic action; 2) end-capping polymerization under high shear action; 3) homogenization reaction under thermal equilibrium conditions. The segmented polymerization reactor integrates an ultrasonic dispersion reaction zone, a high-shear polymerization reaction zone, and a thermal equilibrium adjustment zone from top to bottom. Compared with the prior art, this invention effectively reduces the cyclic content and metal ion residue in the product through segmented reaction and refined control, improves product purity, uniformity of molecular weight distribution, and reaction efficiency, and is suitable for the continuous production of high-quality polysiloxanes.

The invention discloses a device and a method for preparing a narrow-distribution fluorine-containing surfactant by a VDF telomerization method, and belongs to the field of fluorine fine chemical engineering. The device comprises a VDF vaporization conveying system, a polymerization reaction system, a raw material metering system, a conveying system and a recovery system, triethylamine tri-hydrofluoride ionic liquid is adopted as a medium, the reaction temperature (80 + / -0.5 DEG C) and the raw material ratio (VDF: iodoethane = 12: 1 mol) are accurately regulated and controlled through microwaves, and efficient telomerization reaction is achieved. The polydispersity index (PDI) of the product is less than or equal to 1.2, the surface tension is as low as 18mN / m, the solvent recovery rate reaches 95%, the problems of wide product distribution and poor environmental protection property of the traditional process are solved, and the method is suitable for the field of high-end fine chemical engineering.

The invention discloses a preparation method of (E)-1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluorohexyl-3-ene, and the preparation method comprises the following steps: carrying out telomerization reaction on 1, 1-difluoroethane, tetrafluoroethylene and HF in the presence of a catalyst to prepare 1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluorohexane, and then carrying out halogenation and dehydrohalogenation reaction to prepare (E)-1, 1, 1, 2, 2, 5, 5, 6, 6, 6-decafluorohexyl-3-ene. The preparation method provided by the invention has the advantages of cheap and easily available raw materials and high product selectivity.