37 results about "Trifluorotoluene" patented technology

The invention discloses a perfluoropolyether-based polymer solid electrolyte film regulated and controlled by a mixed solvent as well as a preparation method and application of the perfluoropolyether-based polymer solid electrolyte film, and belongs to the field of organic polymer solid electrolyte preparation. Reacting under the action of an initiator and an RAFT (reversible addition-fragmentation chain transfer) reagent to obtain a perfluoropolyether-based copolymer; the method comprises the following steps: adding a perfluoropolyether-based copolymer into a polyvinylidene fluoride-hexafluoropropylene copolymer solution in which lithium salt is dissolved, the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer accounts for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, the mass of the N, N '-dimethylformamide, the mass of the trifluorotoluene and the mass of the perfluoropolyether-based copolymer account for 10%-30% of the mass of the polyvinylidene fluoride-hexafluoropropylene copolymer, and the perfluoropolyether-based polymer solid-state electrolyte film is obtained by uniformly mixing and then preparing a film. And the comprehensive performance of the composite solid electrolyte serving as the film is improved.

The application discloses a continuous production process and equipment for a trifluoromethylbenzene tower, and belongs to the field of organic fluorine chemistry. The production process comprises the following steps: S1: continuously feeding trichloromethylbenzene and hydrogen fluoride into a tower reactor connected with a heat exchanger circulating cooling system in a reverse direction, so that a three-stage continuous fluorination reaction occurs in the tower reactor to obtain crude trifluoromethylbenzene, and unreacted hydrogen fluoride is separated into liquid at the top of the tower and then flows back into the tower reactor; S2: the crude trifluoromethylbenzene obtained in the reaction is subjected to nitrogen bubbling in a bubble tower, and then is continuously distilled in a rectifying tower to obtain finished trifluoromethylbenzene; and S3: byproduct hydrogen chloride generated in the fluorination reaction is introduced into a hydrochloric acid tank to obtain hydrochloric acid, and the content of hydrofluoric acid in the hydrochloric acid is less than 1000 ppm. The method can greatly improve the utilization rate of raw material hydrogen fluoride, improve the purity of byproduct hydrochloric acid, reduce the generation amount of waste acid, avoid the sharp change of pressure in the reaction process, and realize large-scale, continuous, stable and safe production of trifluoromethylbenzene.

The application provides a palladium ion extractant material and a preparation method thereof, and the pyridine-oxadiazole ligand is used as the extractant, most Pd 2+ in the aqueous phase can be extracted into the organic phase in a short time, and has a very high extraction rate; selective extraction separation of Pd 2+ under acidic conditions can be realized, the applicable range of acidity is wide, and excellent extraction capacity is achieved in the range of 0.2-4M nitric acid concentration; the extractant has excellent selectivity to Pd 2+ in the aqueous phase containing various metal ions; the pyridine-oxadiazole extractant has a good application prospect in the separation and recovery of Pd 2+ in high-level radioactive waste; the m-nitro-trifluorotoluene is used as a diluent of the extraction system, has good solubility to the organic ligand and the extractant, and the 2-bromohexanoic acid can increase the lipophilicity of the extractant.

The invention discloses a synthesis method of Olrabatinib, which comprises the following steps: by taking 2-methyl-5-nitro trifluorotoluene as a raw material, carrying out a Waller-Ziegler reaction, an alkylation / silanization reaction of amine, nitro reduction, a condensation reaction and a Caslow-Stevens coupling reaction, so as to obtain the Olrabatinib. By optimizing process conditions and a reaction system, the synthesis method disclosed by the invention has the remarkable advantages in the following aspects: the raw material cost is greatly reduced by adopting low solvent consumption; the product yield is improved by accurately controlling reaction parameters; a standardized post-treatment process is developed, and large-scale stable production is realized. According to the technical system, the technical bottlenecks of high energy consumption and high pollution in the traditional synthesis route are effectively solved, and an innovative solution is provided for green manufacturing of fine chemicals.

The invention relates to an electron withdrawing group terminated polyimide covalent organic framework material as well as a preparation method and application thereof. According to the invention, 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride and a tetra (4-aminophenyl) methane monomer are utilized to prepare a polyamic acid covalent organic framework, and 4-cyanophenyl, 4-aminotrifluorotoluene, 4-nitroaniline and 4-chloroaniline are utilized to perform end capping, so that the electron withdrawing group-terminated polyimide covalent organic framework material is prepared. The rich pore structure of the COF skeleton provides a rapid ion transport channel, the transport of current carriers is promoted, and the electron cloud density of the COF skeleton is adjusted through Lewis acidity formed by an end-capping electron withdrawing group through an induction effect, so that an electron-deficient domain is constructed. When being used in a lithium metal battery system, the material can guide uniform distribution of lithium ions and solve the problem of lithium dendrite growth; when the material is loaded on a lithium-sulfur battery positive electrode material, polysulfide can be pulled to move directionally to complete order reduction conversion reaction, so that the lithium-sulfur battery with long cycle life is obtained.

This invention discloses a method for synthesizing monosubstituted sulfonylamidinium compounds. In an air atmosphere, using commercially available primary sulfonamides and nitriles as substrates, inexpensive trifluoromethanesulfonic anhydride as a catalyst, and trifluorotoluene as a solvent, the product can be efficiently obtained. Compared with existing technologies, this method has the following advantages: inexpensive and readily available reactants; no need for cumbersome synthesis methods; simple reaction system; high atom economy with 100% atom utilization; broad substrate range, compatible with various functional groups; and simple operation.

The research aims to optimize the synthesis process of oxyfluorfen, improve the product yield and purity, and turn byproducts into wealth. According to an original process route, resorcinol is used as a starting raw material, and oxyfluorfen is synthesized through double etherification, nitration and ether exchange. After optimization, the total yield reaches 94.1%, and the purity reaches 98.4%. In order to improve the utilization rate of the raw materials, an acidic water phase obtained after quenching of an oxyfluorfen reaction solution is subjected to reduced pressure distillation, the byproduct 3-chloro-4-hydroxy-trifluorotoluene is recovered, and the yield can reach 93.7%. Further serving as a raw material of a new process, and synthesizing a target product through nucleophilic substitution. In the route, 2, 4-dichloronitrobenzene with moderate reaction activity and better selectivity is innovatively used for replacing 2, 4-difluoronitrobenzene, so that side reaction is effectively inhibited, and a target product with the content of 98.7% is obtained at the total yield of 94.8%. According to the new and old combination strategy, through integration of two process routes, high-valued conversion of by-products is realized, limitation of a traditional synthesis method is broken through, and atom economy is remarkably improved.

The invention provides a preparation method of 2-bromine-5-fluorobenzotrifluoride and a preparation method of the 2-bromine-5-fluorobenzotrifluoride. Specifically, the invention provides a preparation method of a compound as shown in a formula E. The preparation method comprises the following steps: reacting a compound as shown in a formula A with urea to generate a compound as shown in a formula B; in an organic solvent, carrying out substitution reaction on the compound as shown in the formula B and bromine to generate a compound as shown in a formula C; carrying out hydrolysis reaction on the compound as shown in the formula C in an alkaline solution to generate a compound as shown in a formula D; and carrying out diazotization reaction on the compound shown in the formula D, HF and nitrite to generate a compound shown in a formula E. According to the preparation method, the reaction steps are simplified, the bromination selectivity is high, and the production cost can be effectively reduced.

The invention discloses a method for continuously preparing 4-fluoro-2-trifluoromethyl acetophenone, which comprises the following steps of: pre-filling a magnesium metal bed layer in a Grignard reactor, respectively feeding a 2-bromine-5-fluorobenzotrifluoride solution and magnesium metal from the bottom and the top of the Grignard reactor, introducing inert gas from the bottom of the Grignard reactor, and continuously reacting at the temperature of between 20 and 30 DEG C to obtain 4-fluoro-2-trifluoromethyl acetophenone. After being distributed by the microporous disperser, the gas uniformly enters the Grignard reactor from bottom to top, and the gas discharged from a gas outlet in the top of the Grignard reactor is re-introduced into the bottom of the Grignard reactor; reaction liquid obtained after the Grignard reaction is completed flows out and then is divided into two parts, a small part of the first part returns to the bottom of the Grignard reactor to serve as an initiator of the Grignard reaction, and a large part of the second part is sequentially subjected to acylation reaction and acidolysis reaction and then is subjected to post-treatment, so that the target product 4-fluoro-2-trifluoromethyl acetophenone is obtained. The method has the advantages of high reaction efficiency, simple system, low cost and the like, and industrial production is easy to realize.

This invention relates to the field of acyclic or carbocyclic compounds and discloses a method for preparing 6-bromo-2,3-difluorotrifluorotoluene, comprising: dissolving 2,3-difluorotrifluorotoluene in a mixed solvent composed of a polar modifier containing a proton acceptor site and a nonpolar solvent; adding a polyether stabilizer and an iron-based catalyst; and dropwise adding liquid bromine to trigger a directional bromination reaction. The method utilizes the protonated ion-pair complex formed by the in-situ generation of hydrogen bromide and the polar modifier, which, in conjunction with the polyether stabilizer, constructs a sterically hindered shielding structure at positions 4 and 5 of the substrate molecule. This invention forces the electrophilic substitution pathway to be directed towards position 6 of the substrate molecule, overcoming the bottleneck of extremely low positioning accuracy in passivated aromatic ring systems, transforming disordered isomers into a single dominant isomer, thereby reducing separation energy consumption.

The present invention relates to an improved process for the preparation of 2-bromo-5-fluorobenzotrifluoride comprising, reacting 3-fluorobenzotrifluoride with brominating agent in the presence of antimony catalyst selected from antimony trichloride (SbCl3), antimony pentachloride (SbCl5) or mixture(s) thereof, to provide 2-bromo-5- fluorobenzotrifluoride with higher yield and purity

The invention relates to a preparation method of 3-bromobenzotrifluoride, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: taking benzotrifluoride as a raw material, and reacting with liquid bromine under the action of a catalyst and a complexing agent to obtain 3-bromobenzotrifluoride; the catalyst is iron powder, ferric trichloride or ferric tribromide; the complexing agent is at least one of methanol, ethanol, methyl tertiary butyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, acetone or sodium acetate. The compound containing lone pair electrons is added into the reaction liquid to form a complex with ferric iron, so that the activity of the ferric iron catalyst is reduced, and the situation that the bromine substitution selectivity is reduced due to too high activity is avoided; the selectivity of aromatic ring bromine meta-substitution is improved, the generation of para-bromine substituted isomers and polysubstituted impurities is reduced, and the purity and yield of the product are improved.

The utility model discloses a 2-ethylthio-3-chloro-trifluorotoluene production device which comprises a DMF (Dimethyl Formamide) head tank, an ethanethiol head tank, a 2-fluoro-3-chloro-trifluorotoluene feeding pipe and an etherification reaction kettle, the etherification reaction kettle comprises a reaction kettle main body, a cooling jacket is arranged on a shell of the reaction kettle main body, and the cooling jacket is connected with the etherification reaction kettle. And a built-in cooling coil pipe is arranged in the shell of the reaction kettle main body. The etherification reaction kettle has the advantages that the built-in cooling coil pipe is additionally arranged on the basis of cooling of the jacket of the shell, frozen saline water can be fed into the etherification reaction kettle through the built-in cooling coil pipe, then heat released by reaction is directly taken away in time, solvent volatilization is reduced, meanwhile, side reaction can be effectively inhibited, and the service life of the etherification reaction kettle is prolonged. Impurities are reduced, and the yield of the intermediate is improved. In addition, the solvent volatilized along with the tail gas is condensed through the first condenser to be recycled, and the recycling rate of the solvent is increased.

The invention belongs to the technical field of copper-clad plates, and particularly relates to a high-heat-resistance copper-clad plate and a preparation method thereof. Comprising the following steps: preparing a porous heat-conducting polyimide film; preparing a waterproof heat-resistant prepreg; and hot-pressing and curing the high-heat-resistance copper-clad plate. The preparation method comprises the following steps: reacting zingerone, 2-amino-5-fluorobenzotrifluoride and paraformaldehyde to prepare a waterproof heat-resistant modified benzoxazine monomer, and then carrying out filling and coating modification on a porous heat-conducting polyimide film through monomer polymerization. A cross-linked network formed by ring opening polymerization of the waterproof heat-resistant modified benzoxazine monomer can effectively constrain movement of a polyimide molecular chain, excellent moisture resistance, high temperature resistance and interface bonding performance are endowed to the polyimide while the excellent intrinsic performance of the polyimide is reserved, and the heat-resistant and water-resistant stability of a copper-clad plate can be guaranteed when the copper-clad plate is prepared.

The present application relates to an electron-withdrawing group terminated polyimide covalent organic framework material and a preparation method and application thereof. The present application utilizes 4,4'-(hexafluoroisopropylidene)diphthalic anhydride and tetra(4-aminophenyl)methane monomers to prepare a polyamide acid covalent organic framework, and utilizes 4-aminobenzonitrile, 4-amino-trifluorotoluene, 4-nitroaniline and 4-chloroaniline to perform termination, thereby preparing an electron-withdrawing group terminated polyimide covalent organic framework material. The rich pore structure of the COF framework provides a fast ion transmission channel, promotes the transport of carriers, the Lewis acidity formed by the end-capped electron-withdrawing group adjusts the electron cloud density of the COF framework through an inductive effect, and an electron-deficient domain is constructed. In a lithium metal battery system, it can guide the uniform distribution of lithium ions, solve the problem of lithium dendrite growth; when loaded on a lithium-sulfur battery positive electrode material, it can lead the directional movement of polysulfides to complete the down-order conversion reaction, thereby obtaining a lithium-sulfur battery with long cycle life.

The invention relates to the technical field of organic chemical synthesis, in particular to a method for synthesizing a 1, 3-diboron ester naphthalene compound through aromatization driving, which comprises the following steps: mixing a benzo cyclohexanone derivative with an enol leaving group, bis (pinacol) borate and organic alkali (bis (trimethylsilyl) sodium amide) in a solvent (trifluorotoluene and cyclohexane); the preparation method comprises the following steps: firstly, stirring at room temperature for pre-complexing, then heating to 30-70 DEG C (preferably 40 DEG C), and carrying out double boronation and aromatization reaction to generate the 1, 3-diboron ester naphthalene compound. The preparation method is simple, does not need a transition metal catalyst, avoids the problems of heavy metal residues and biotoxicity, realizes efficient and regioselective double boronation reaction, and solves the problems that a traditional method depends on a metal catalyst and the regioselectivity is poor.

This invention relates to the field of antifoaming agent compositions, and more particularly to an antifoaming agent composition, its preparation method, and its application. The antifoaming agent composition comprises a dispersing solvent, an active antifoaming agent component, a dispersing aid, and a base oil in a weight ratio of 1–50:0.0001–5:1–90:1–20; the dispersing solvent is selected from one or more of acetone, kerosene, methyl ethyl ketone, methyl isobutyl ketone, m-difluorotoluene, toluene, and cyclohexanone. The antifoaming agent composition provided by this invention exhibits excellent antifoaming properties. When added to lubricating oil, it can quickly eliminate foam generated in the lubricating oil due to mechanical agitation and other factors. Simultaneously, it solves the problem of the antifoaming agent being difficult to disperse and easily sedimenting in oil, ensuring the long-term stability of the antifoaming agent in lubricating oil, and thus solving the high-temperature stability problem. The antifoaming agent composition of this invention is suitable for application in the field of lubricating oil, especially in lubricating oils used in ultra-low viscosity electric vehicles.

This invention discloses a method for preparing 2-nitro-4-(trifluoromethyl)benzonitrile. Specifically, this invention discloses a method for preparing 2-nitro-4-(trifluoromethyl)benzonitrile, which includes the following steps: (1) activating 4-chloro-3-nitrotrifluorotoluene with KF in the absence of solvent or in an aprotic solvent to obtain mixture I; (2) reacting mixture I with a cyaniding reagent to prepare 2-nitro-4-(trifluoromethyl)benzonitrile; wherein mixture I contains a portion of unactivated 4-chloro-3-nitrotrifluorotoluene. The method for preparing 2-nitro-4-(trifluoromethyl)benzonitrile according to this invention is simple to operate and has a high yield.

The invention relates to the technical field of wave-transparent materials, in particular to wave-transparent resin for an aircraft equipment compartment and a preparation method of the wave-transparent resin. The method comprises the following steps: reacting 5-bromine-2-fluorine-trifluorotoluene with chirality-1, 1 '-co-2-naphthol under the protection of nitrogen to obtain a chiral monomer, polymerizing the chiral monomer with biphenyl phthalazinone through an initiator to obtain a prepolymer, and finally terminating with 4-nitrophthalonitrile to obtain the target resin. According to the method, regular accumulation of molecules is destroyed by mixing 1, 1 '-bi-2-naphthol with different configurations, and the low polarity of-CF3 and a rigid framework of biphenyl phthalazinone are combined, so that the dielectric property and the thermal stability of the resin are cooperatively regulated and controlled. The obtained wave-transparent resin is low in dielectric constant and loss, high in thermal decomposition temperature and glass transition temperature, excellent in mechanical property and high-temperature retention rate, low in softening point and good in solubility, can be easily compounded and molded with quartz fiber cloth, is suitable for preparation of wave-transparent composite materials for aircraft equipment cabins, and meets the requirements of broadband high-temperature service.

The invention discloses an adsorbent for treating perfluoro and polyfluoroalkyl substances in water as well as a preparation method and application of the adsorbent, the adsorbent is a trifluoromethyl functionalized amphiphilic covalent organic framework (TpPa-CF-COF), and the adsorbent is formed by carrying out a Schiff base reaction on trialdehyde phloroglucinol and 2, 5-diamino benzotrifluoride. The preparation method adopts a green and efficient mechanochemical synthesis method and comprises the following steps: putting the two monomers into a grinding container in proportion, adding a trace liquid auxiliary grinding additive and a catalyst, and grinding in a ball mill at room temperature for 30 minutes to 2 hours. The method overcomes the defects of high temperature, high pressure and time consumption of a traditional solvothermal method, and is rapid in reaction, safe in operation and extremely low in solvent consumption. The obtained material is high in crystallinity, large in specific surface area (up to 800 m / g or above) and good in thermal stability and chemical stability, shows high adsorption capacity (up to 443 mg / g) and excellent selectivity for PFAS (such as PFOS) in water, and can be recycled, and a new solution is provided for efficient removal of PFAS.

The invention discloses a synthesis method of 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-biphenyl dianhydride, which comprises the following steps: by taking 3-nitro-4-methylbenzotrifluoride as an initial raw material, firstly carrying out hydrogenation coupling to obtain a first intermediate 2, 2'-dimethyl-5, 5 '-bis (trifluoromethyl) hydrogenated azobenzene, then carrying out transposition rearrangement to obtain a second intermediate 2, 2'-bis (trifluoromethyl)-5, 5 '-dimethyl benzidine, and then carrying out condensation reaction to obtain 2, 2'-bis (trifluoromethyl)-4, 4 ', 5, 5'-biphenyl dianhydride, thereby obtaining the 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-biphenyl dianhydride. The preparation method comprises the following steps: reacting 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-dimethyl biphenyl dinitrile to obtain a third intermediate 2, 2'-bis (trifluoromethyl)-5, 5 '-dimethyl biphenyl dinitrile, and carrying out hydrolysis, oxidation and anhydride formation to obtain 2, 2'-bis (trifluoromethyl)-4, 4 ', 5, 5'-biphenyl dianhydride. The synthesis method provided by the invention has the advantages of cheap and easily available initial raw materials, no need of using expensive iodine reagent and butyl lithium, low production cost, mild reaction conditions, low energy consumption, environmental friendliness and high total yield, and is suitable for large-scale industrial production.

The invention discloses a continuous flow preparation method of 4-nitrobenzotrifluoride, and belongs to the technical field of fine chemical engineering. The technical scheme of the invention is as follows: the whole reaction is carried out in three microchannel continuous flow reactors connected in series in three steps, and 4-bromobenzotrifluoride is used as a raw material and firstly reacts with butyl lithium; then reacting with tri (trifluoroethyl) boric acid ester to generate an intermediate boric acid ester lithium salt; and finally reacting with nitric acid to obtain the 4-nitrobenzotrifluoride. The raw materials are available in the market, continuous flow reaction is adopted, continuous reaction production can be realized, the reaction can be terminated in time, the safety is greatly improved, the operation is simple and convenient, and the yield is high.

This invention belongs to the field of cleaning agent technology, specifically relating to a high-efficiency oil layer cleaning agent and its preparation method. The high-efficiency oil layer cleaning agent, by weight percentage, consists of the following raw materials: sodium perfluorobenzenesulfonate 0.2-0.3%; trifluorotoluene polyurethane ether 0.1-0.2%; rapid penetrant T 0.1-0.2%; the balance being water; wherein the structural formula of sodium perfluorobenzenesulfonate is as follows:; the structural formula of trifluorotoluene polyurethane ether is as follows: where m=5-20, n=5-50; and the structural formula of rapid penetrant T is as follows: This invention combines strong temperature and salt resistance with low foaming and easy operation, enabling deep, rapid, and thorough cleaning of heavy oil stains; the oil removal rate of the cleaning agent of this invention can reach up to 97.5%.

The invention belongs to the field of coating materials, and particularly relates to a preparation method of a two-component pressure-sensitive coating suitable for dynamic flow field temperature correction, the two-component pressure-sensitive coating comprises the following components by mass volume: 80 mg of a rapid pressure-sensitive probe, 2 g of a rapid temperature-sensitive probe, 4 g of a binder, 2 g of a filler, 100 ml of a solvent, and 5 g of a dispersant; wherein the rapid pressure sensitive probe is PtTFPP, the rapid temperature sensitive probe is BaSi2O2N2: Eu, the binder is fluorine-containing resin, the filler is SiO2, the solvent is benzotrifluoride, and the dispersant is Tween 80; the oxygen quenching characteristic of the pressure sensitive probe PtTFPP is stable, the response time of the temperature sensitive probe BaSi2O2N2: Eu is only 1 microsecond, double-coefficient calibration is combined, the dynamic flow field temperature interference can be corrected, the pressure measurement accuracy is greatly improved, the fluorine-containing resin binder is weather-resistant and chemical corrosion-resistant, the dispersing agent is matched to prevent agglomeration, and the SiO2 filler is used for enhancing the mechanical property, so that the method has the advantages of high sensitivity, high reliability and the like. The coating is not easy to fall off and deteriorate in complex environments such as high temperature and airflow scouring, and the service life is long.

The invention provides a method for preparing trifluorotoluene by applying a defluorination-preventing palladium-carbon catalyst to fixed bed catalytic hydrogenation, which comprises the following steps: filling a fixed bed reactor with a palladium-carbon catalyst, sealing, and continuously introducing hydrogen; a chlorobenzotrifluoride compound is continuously introduced, the reaction temperature is 240-260 DEG C, and the mass space velocity of the chlorobenzotrifluoride compound is 0.6-1.25; and collecting the dechlorinated hydrogenation reduction material after the reaction is finished, and purifying to obtain the benzotrifluoride. The method for preparing trifluorotoluene by applying the defluorination-preventing palladium carbon catalyst to fixed bed catalytic hydrogenation is high in yield, less in three wastes, low in cost and high in safety.

The invention discloses a synthesis method of a meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methyl vinyl)-2-(trifluoromethyl) benzene, which comprises the following steps of: performing defluorination etherification reaction on 2-bromine-5-fluorobenzotrifluoride (I) serving as a raw material and 4-chlorophenol (II) in the presence of an alkaline reagent to obtain 1-bromine-4-(4-chlorophenoxy)-2-(trifluoromethyl) benzene (III), and reacting the 1-bromine-4-(4-chlorophenoxy)-2-(trifluoromethyl) benzene (III) with 4-chlorophenol (II) to obtain the meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methylvinyl)-2-(trifluoromethyl) benzene (III). The preparation method comprises the following steps: reacting a compound (III) with a Grignard exchange reagent (IV) to prepare an aryl Grignard reagent, and reacting with isopropenyl acetate (V) under the action of an iron catalyst to obtain a meconazole intermediate 4-(4-chlorophenoxy)-1-(1-methylvinyl)-2-(trifluoromethyl) benzene (VI); the method has the advantages of simple reaction system, cheap and easily available raw materials, high raw material conversion rate and high product selectivity, is suitable for industrial production, and has a good application prospect; .

The present invention discloses a cost-effective and industrially amenable process for the preparation of 2-bromo-5-fluoro trifluorotoluene of formula (I) from 3-fluoro benzotrifluoride of formula (II).

Disclosed are a urea compound containing nitrobenzene, a preparation method therefor, and use thereof. The preparation method comprises: dissolving bis(trichloromethyl)carbonate in anhydrous tetrahydrofuran, adding a solution of 4-nitroaniline in tetrahydrofuran, stirring uniformly after dropwise addition is completed, then adding triethylamine, stirring uniformly, evaporating the solvent to dryness, adding a solution of 4-aminobenzotrifluoride in anhydrous tetrahydrofuran, and reacting at 45 °C for 3 h to obtain the urea compound containing nitrobenzene. The urea compound containing nitrobenzene can effectively alleviate the swelling and plasma extravasation of the soles of mice, and skin vasodilation and mast cell degranulation of the soles of mice, which are caused by C48 / 80, thereby inhibiting the occurrence of anaphylactoid reactions. Therefore, using the urea compound containing nitrobenzene as an anti-drug allergy formulation provides more possible treatment regimens for the clinical treatment of drug allergies.

The present application relates to the field of processing liquid, in particular to an environment-friendly magnesium alloy processing liquid and a preparation method thereof, the magnesium alloy processing liquid comprises, by weight fraction: 5-10 parts of base oil, 5-15 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 10-20 parts of emulsifier, 0.05-0.2 parts of defoaming agent, 2-4 parts of wetting agent, 1-2 parts of pH regulator and 15-30 parts of deionized water; the rust inhibitor is a product prepared by ring-opening reaction of 3-amino trifluorotoluene and ethylene glycol diglycidyl ether as reactants. The magnesium alloy processing liquid prepared by the present application uses green and environment-friendly plant-based synthetic ester as base oil, which is environmentally friendly from raw materials to emissions, reducing environmental pollution. The processing liquid performs well in the processing of magnesium alloy material parts, can effectively prevent the oxidation discoloration of sensitive magnesium alloy and magnesium-aluminum alloy, inhibit the dissolution of magnesium ions, and has excellent lubricity and flame retardance.

The present application relates to the field of processing liquid, and more particularly to a kind of water-based magnesium alloy processing liquid and preparation method thereof, magnesium alloy processing liquid is calculated according to weight fraction, including: 25-38 parts of base oil, 6-15 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 13-25 parts of emulsifier, 0.1-0.25 parts of defoaming agent, 0.6-1.8 parts of wetting agent, 2.1-4.8 parts of pH regulator and 30-40 parts of deionized water;The rust inhibitor is the product obtained after condensation reaction of 3-(hydroxymethyl) phenylboronic acid and 3-amino trifluorotoluene.The water-based magnesium alloy processing liquid formula prepared by the present application has excellent rust resistance, safety and service life through unique design, and realizes efficient protection of magnesium alloy processing.