101 results about "Nitroaniline" patented technology

The invention discloses a method for synthesizing L-γ-glutamyl-3-carboxyl-4-nitroaniline ammonium salt, and relates to the technical field of organic synthesis. According to the invention, Glupa-C is synthesized by using 5-amino-2-nitrobenzoic acid and 3-nitrophthaloyl-L-glutamic anhydride as starting materials through a condensation reaction and a hydrazinolysis reaction under the catalytic action of a Lewis acid. Compared with traditional alkaline preparation conditions, the use of highly toxic reagents and the safety hazard of explosion during the preparation process are avoided, production risks are reduced, and energy consumption is lowered. In addition, the synthesis method provided by the invention can achieve a total yield of 47.8% and a purity of 99.96% for the product Glupa-C, and is suitable for industrial production.

The invention belongs to the technical field of catalysts, and particularly relates to a formaldehyde removal catalyst and a preparation method and application thereof. The formaldehyde removal catalyst is prepared by carrying out hydrothermal reaction and roasting treatment on a mixture of the following raw materials: metal salts including Mn salt, Co salt and Fe salt; an organic precursor, wherein the organic precursor comprises 2-nitroaniline and carboxymethyl cellulose; wherein the molar ratio of the Mn element to the Co element to the Fe element in the metal salt is (4.5 to 5.0): (2.0 to 2.5): (1.5 to 1.8); the ratio of the total mass of the Mn element, the Co element and the Fe element in the metal salt to the mass of the organic precursor is (80-85): (15-20). According to the formaldehyde removal catalyst, the metal elements are loaded on the hydrophobic carbon layer of the nitrogen-containing structure, so that the problem that the toluene adsorption capacity is weak due to the fact that a traditional catalyst does not have specific sites is solved, and the problem that the catalyst is inactivated due to the fact that multiple pollutants compete for active sites and a product overflows slowly can also be solved.

The invention discloses a preparation method of a regenerated polyester fiber, and relates to the technical field of polyester fibers. The present invention first utilizes (4-formylphenyl) phosphonic acid to combine with 2-(3-nitroaniline) acetohydrazide to form a Schiff base structure, achieves antibacterial effect, and simultaneously introduces phosphorus element to achieve flame retardant and anti-wear effect; then forms a modified wear-resistant agent of a cross-linked network structure with butanediol, significantly enhancing the wear-resistant effect of fiber; then utilizes 1,7-octadiene-3-ol and octene trichlorosilane copolymerization to make a modifier, form a cross-linked network structure, enhance wear-resistant effect, and simultaneously be able to suppress the burning of flame, achieve flame retardant effect; then attracts the modifier by hydroxylated carbon nanotubes to prepare modified carbon nanotubes in situ polymerization on its surface, improve carbon nanotube dispersibility, prevent fiber from falling off, and improve the wear resistance of material; finally, regenerated polyester fiber, modified wear-resistant agent, and composite modified carbon nanotube are mixed and melt-spun to achieve wear-resistant, antibacterial, flame-retardant effect.

The invention relates to a method for preparing a 4-chloro-3-nitroanisole compound, in particular to a method for preparing a 4-chloro-3-nitroanisole compound by using a microreactor, which comprises the following steps: carrying out a raw material diazotization reaction by using the microreactor, then carrying out a chlorination reaction in an intermittent tank reactor, and taking 2-methoxy-4-nitroaniline as a raw material to prepare the 4-chloro-3-nitroanisole compound. The 4-chloro-3-nitroanisole compound is prepared from sodium nitrite and cuprous chloride. According to the invention, diazotization of 4-chloro-3-nitroanisole is realized on the micro-reaction device, and the method has the advantages of simple process, continuous production, small reaction volume, short reaction time, small corrosion to equipment, high operation safety and the like. Meanwhile, by utilizing the characteristics of high-efficiency heat mass transfer capacity and easiness in direct amplification of the microchannel reactor, the yield is high and is 80-85%, the product quality is good, the energy consumption is low, and the method is a green, environment-friendly and high-efficiency method for preparing the 4-chloro-3-nitroanisole and is suitable for industrial application.

The invention discloses a synthesis method of 5-nitro-2-aminophenol, which comprises the following steps: by using 2-chloro-4-nitroaniline as a raw material, providing an amino protecting group by using di-tert-butyl dicarbonate ester to obtain a compound 3; carrying out hydrolysis reaction in an alkaline environment to hydrolyze chlorine groups on benzene rings into hydroxyl groups to obtain a compound 4; and removing an amino protecting group under an acidic condition to obtain the 5-nitro-2-aminophenol. According to the method, 2-chloro-4-nitroaniline is used as a starting raw material, compared with expensive ortho-aminophenol, the cost of the raw material can be remarkably reduced, use of expensive catalysts in the hydrolysis process is avoided through amino protection, generation of the byproduct 2-amino-4-nitrophenol is effectively reduced, and the yield of the 2-chloro-4-nitrophenol is increased. And the synthesized 5-nitro-2-aminophenol has relatively high purity (99.5%) and relatively high yield (-86%). The method has the advantages of conventional production steps and conventional process equipment, and has a good application prospect.

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.

The safety interlocking device comprises a kettle body, a hollow supporting shaft is arranged in the kettle body, a plurality of stirring blades are fixed to the outer wall of the hollow supporting shaft at equal intervals, a first condensation pipe is arranged on the inner wall of the hollow supporting shaft in an attached mode, and a second condensation pipe is arranged on the inner wall of the first condensation pipe. A first condensation pipe is arranged in the kettle body, a condensation pipe joint is arranged at one end of the first condensation pipe, an interlayer is arranged on the inner wall of the kettle body, a third condensation pipe is laid in the interlayer, a cooling mechanism and a gas storage mechanism are arranged on one side of the kettle body at the same time, the cooling mechanism is connected with the gas storage mechanism, and an opening and closing mechanism is arranged on the inner wall of the kettle body; the safety interlocking device comprises a kettle body, a cooling mechanism is arranged in the kettle body, the cooling mechanism comprises a plurality of liquid passing pipes, a plurality of liquid passing openings are formed in the inner wall of one side of the kettle body, and the liquid passing openings are connected with the two ends of the liquid passing pipes respectively. The effect of explosion in the reaction can be effectively avoided.

The invention relates to an atestin diterpenoid compound as well as a preparation method and application thereof, and belongs to the technical field of medicinal chemistry. The preparation method of the atestin diterpenoid compound comprises the following steps: S1, taking commercially available paranitroaniline 1a as a raw material to obtain an intermediate 2a; carrying out amide condensation and reduction on the intermediate 2a and corresponding amine to obtain intermediates 4a-4c; s2, taking commercially available m-nitrophenol 1d as a raw material to obtain an intermediate 3d; s3, taking commercially available 1-(t-butyloxycarbonyl) piperidine-3-carboxylic acid 1e as a raw material to obtain an intermediate 3e; s4, taking a compound J10 separated from a natural plant sea lacquer as a raw material to obtain compounds HXY1-6; and S5, taking a compound J12 separated from a natural plant sea lacquer as a raw material to obtain compounds HXY7-23. The invention aims to explore a preferable compound with a novel structure, better activity and high safety through structural optimization of a natural product, and provides support for research and development of a novel sEH inhibitor and an anti-AD drug.

The application discloses a preparation method of triclabendazole, and relates to the technical field of raw medicine synthesis. The method comprises the following steps: taking 4-chloro-5-(2,3-dichlorophenoxy)-2-nitroaniline as raw material, and sequentially performing reduction in an iron powder ethanol system, ring closure with a sulfur-containing ring closure reagent, methylation with dimethyl sulfate, and crystallization and purification in ethanol to obtain triclabendazole finished products. In the reaction process, iron mud is removed through pressure filtration, ethanol is recovered through distillation, and the ring closure intermediate is precipitated under acidic conditions. The process condition is clear, the operation is simple, the emission of hazardous waste can be reduced, the utilization rate of solvents and the purity of products can be improved, and the method is suitable for industrialized production of triclabendazole raw medicine.

The invention relates to an environment-friendly stripping agent of photosensitive ink for electroplating shielding, and belongs to the technical field of stripping agents. The preparation method comprises the following steps: carrying out nucleophilic addition on phosphorous acid and diethylene glycol monobutyl ether to obtain a modified precursor containing a phosphoester structure, carrying out Michael addition on the modified precursor and ortho-aminophenol to obtain a modified monomer, carrying out diazotization reaction on the modified monomer and ortho-nitroaniline, and then reducing to obtain the 2-(2-nitrophenyl)-1, 2, 4-thiadiazole. And finally, compounding the modified corrosion inhibitor with a stripping agent system, so as to obtain the environment-friendly stripping agent for the photosensitive ink for electroplating shielding. The environment-friendly stripping agent of the photosensitive ink for electroplating shielding has the advantages of environment friendliness, no toxicity, high stripping efficiency, broad-spectrum corrosion inhibition and few surface residues.

The application discloses a method for preparing 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene in a water medium system. The method controls the molar dosage ratio of tert-octyl phenol and NaOH in an emulsification process, controls the mass concentration of tert-octyl phenol in an emulsion, controls the molar dosage ratio of o-nitroaniline and tert-octyl phenol, and controls the mass dosage ratio of an anionic high polymer surfactant and a non-ionic surfactant, so that 2-nitro-2'-hydroxy-5'-tert-octyl azobenzene with high purity is prepared. Compared with a traditional synthesis process, the method uses water as a reaction medium, avoids the use of an organic solvent, effectively reduces the difficulty in treating subsequent wastewater, and achieves a target product yield of more than 95% and a purity of 91.79%-94.52%.

A synthesis method of a maribavir intermediate 2-bromo-5,6-dichloro-1H-benzimidazole, which is prepared from 4,5-dichloro-2-nitroaniline as raw material through hydrogenation reduction, cyclization and nucleophilic substitution reaction to obtain the intermediate 2-bromo-5,6-dichloro-1H-benzimidazole. The reagent selected in the application has low price, mild reaction condition, simple operation, high process reproducibility, simple post-treatment, high product purity and yield, and has realized workshop industrial production.

The invention discloses a phase-change temperature-control polyurethane material and a preparation method thereof, and relates to the technical field of polymer materials. When preparing the phase-change temperature-control polyurethane material, the present invention reacts vanadium dioxide and 4-anilinotriethoxysilane to obtain pre-modified vanadium dioxide; pre-modified vanadium dioxide and N,N-dimethyl-4-nitrosoaniline are reacted to obtain modified vanadium dioxide; phenylboric acid and 3-chloropropylmethyldimethoxysilane are polymerized and end-capped with 1,3-bis(3-hydroxypropyl)-1,1,3,3-tetramethyldisiloxane to obtain borosiloxane oligomer; borosiloxane oligomer, 1,6-hexanediol and isophorone diisocyanate are polymerized to obtain functionalized polyurethane; functionalized polyurethane and modified vanadium dioxide are uniformly mixed, and compression molding is performed to obtain the phase-change temperature-control polyurethane material. The phase-change temperature-control polyurethane material prepared by the present invention has excellent energy-saving temperature control, anti-aging, antibacterial, self-healing and mechanical properties.

The invention relates to a preparation method of an environment-friendly dye intermediate and the environment-friendly dye intermediate prepared by the method. The preparation method of the environment-friendly dye intermediate comprises the following steps: a dissolving step: 2-R-4-nitroaniline and halate are dissolved in an organic solvent to obtain an initial solution, the chemical structural formula of the 2-R-4-nitroaniline is shown in the formula (1), R represents-Cl,-Br or-CN: (1); a reaction step: hydrogen chloride gas is introduced into the initial solution for a reaction, and a reaction product is obtained; and a separation step: carrying out separation treatment on the reaction product to obtain mother liquor and a crude product. The preparation method of the environment-friendly dye intermediate is more reasonable in process, and the organic solvent is used in the preparation process, so that the environment-friendly index of the product reaches the standard, and no high-COC and / or PCP sewage is discharged.

This invention belongs to the field of organic chemical synthesis technology, specifically relating to a method for synthesizing 2-fluoro-3-aminobenzoic acid, an important chemical intermediate. Specifically, o-nitroaniline is condensed with hydrated trichloroacetaldehyde and hydroxylamine hydrochloride to obtain 2-(hydroxyimino)-N-(2-nitrophenyl)acetamide; the resulting product undergoes an intramolecular Beckmann rearrangement to generate 7-nitroindigo; 7-nitroindigo undergoes Bayer-Villedge oxidation to generate 2-amino-3-nitrobenzoic acid; 2-amino-3-nitrobenzoic acid undergoes diazotization and halogenation reactions to generate 2-fluoro-3-nitrobenzoic acid or 2-chloro-3-nitrobenzoic acid; 2-fluoro-3-nitrobenzoic acid can be further reduced by nitro to obtain 2-fluoro-3-aminobenzoic acid; or, 2-chloro-3-nitrobenzoic acid can be esterified to obtain 2-chloro-3-nitrobenzoic acid ester, which can then be fluorinated, saponified, and reduced to obtain 2-fluoro-3-aminobenzoic acid. The raw materials of this invention are low in cost and readily available, and the entire reaction route has specific regioselectivity, making it suitable for industrial production.

The invention discloses a method for synthesizing 3, 5-dichloronitrobenzene, which comprises the following steps of: a, adding 2, 6-dichloro-4-nitroaniline into concentrated sulfuric acid and nitrososulfuric acid to carry out diazotization reaction to obtain diazo liquid; b, adding the diazotization liquid in the step a into a mixture of a reducing agent and a catalyst copper salt, and carrying out a deamination reaction; c, a solvent is added for extraction, and a 3, 5-dichloronitrobenzene solution is obtained. The method for synthesizing the 3, 5-dichloronitrobenzene is simple in process operation, low in production cost, high in yield and suitable for industrial production.

The present application discloses a method for continuously and efficiently synthesizing N-methyl-p-nitroaniline, comprising the following steps: S1, using an organic solvent to prepare 1-fluoro-4-nitrobenzene solution, stirring and dissolving, filtering and removing impurities, transferring to container A for insulation; S2, using an organic solvent to prepare methylamine solution, adding a preferred catalyst, controlling the temperature at 25 DEG C-50 DEG C, transferring the prepared solution to container B for insulation; S3, using an organic solvent to exhaust, ensuring that there is no bubble in micro mixer and continuous flow reactor, utilizing a transfer pump to introduce material from container A and container B into continuous flow reactor in a certain ratio through a micro mixer, regulating the temperature and pressure in the reactor for reaction to obtain a reaction solution; S4, after the reaction solution flows out, it is collected in container C, the collected reaction solution is filtered, washed with an organic solvent, and dried to obtain a crude product N-methyl-p-nitroaniline. The present application effectively solves the problems of high safety risk of intermittent kettle process, complicated steps, and long reaction time.

The present invention discloses an ethoxylated [6] aromatic hydrocarbon microcrystal and its application in recovering nitroaniline. The present invention obtains ethoxylated [6] aromatic hydrocarbon solid microcrystals by a cooling crystallization-vacuum drying method. The ethoxylated [6] aromatic hydrocarbon microcrystals are dispersed in waste containing nitroaniline to achieve adsorption of nitroaniline by the ethoxylated [6] aromatic hydrocarbon solid powder. The adsorption method of the present invention is simple to operate, safe and reliable, and has high adsorption efficiency. The ethoxylated [6] aromatic hydrocarbon solid powder is easily obtainable and reusable.

The invention discloses water-based ink for paperboard printing and a green printing process of the water-based ink, and relates to the technical field of water-based ink for paperboards. Sodium nitrite is taken and added into deionized water to be evenly mixed, and a sodium nitrite solution is obtained; adding hydrochloric acid and acetic acid into deionized water, and uniformly mixing; 4-methyl-2-nitroaniline is added, and stirring is carried out; cooling, adding a sodium nitrite solution, and reacting to obtain a solution; adding sodium hydroxide into deionized water, uniformly mixing, adding azoic coupling component, uniformly mixing, and cooling; slowly adding the solution and reacting; heating, reacting and cooling; and carrying out suction filtration, drying and refining to obtain the water-based pigment. Taking a polyurethane emulsion and a polyacrylate emulsion, and uniformly mixing the polyurethane emulsion and the polyacrylate emulsion to obtain a polyurethane-polyacrylate emulsion; taking the polyurethane-polyacrylate emulsion, water-based pigment, polyethylene wax emulsion, a wetting agent, a flatting agent, deionized water and absolute ethyl alcohol, and dispersing to obtain the water-based ink.

The invention provides a preparation method of 2-chloro-4-nitro-6-bromoaniline and a diazonium salt of the 2-chloro-4-nitro-6-bromoaniline. The preparation method of 2-chloro-4-nitro-6-bromoaniline comprises the following steps: a chlorination step: carrying out a chlorination reaction on paranitroaniline to obtain a chlorination reaction product, and carrying out post-treatment on the chlorination reaction product to obtain a 2-chloro-4-nitroaniline product; wherein the water content of the 2-chloro-4-nitroaniline product is 60% or below; and a bromination step: mixing the 2-chloro-4-nitroaniline product with sulfuric acid to obtain a sulfuric acid slurry, and carrying out a bromination reaction on the sulfuric acid slurry and a brominating agent to obtain a 2-chloro-4-nitro-6-bromoaniline reaction solution. The 2-chloro-4-nitroaniline is prepared by taking paranitroaniline as an initial raw material through chlorination reaction and post-treatment, and then the sulfuric acid is taken as a solvent to penetrate through the subsequent reaction, so that the separation process is simplified, the production cost is reduced, and waste and pollution are reduced.

The application discloses a resin for adsorbing o-nitroaniline and a preparation method thereof, and belongs to the technical field of resin production. After polystyrene resin is subjected to a chloroacetylation reaction, the polystyrene resin is reacted with octadecylamine to graft long-chain alkyl, imino and carbon groups on the molecular chain structure of the polystyrene resin. The long-chain alkyl can form a network winding structure, facilitating the contact adsorption of the resin and o-nitroaniline and enhancing the hydrophobicity of the resin. Hydrophobic interaction and hydrogen bond interaction exist between the grafted polystyrene resin and o-nitroaniline, which can improve the adsorption performance of the resin on o-nitroaniline in wastewater, is beneficial to the recovery of o-nitroaniline in the wastewater and reduces the pollution caused by wastewater discharge.

The application belongs to the technical field of synthesis of organic light-emitting material intermediates, and particularly relates to a preparation method of 2-bromo-9-phenyl-9H-carbazole, which comprises the following steps: under inert gas, 2-nitroaniline and a bromine reagent are subjected to an electrophilic aromatic substitution reaction to generate an intermediate A-1; under acidic conditions, sodium nitrite and the intermediate A-1 are subjected to a diazotization reaction to generate a diazonium salt, and then under alkaline conditions, the diazonium salt is coupled with benzene to generate an intermediate A-2; the intermediate A-2 and triphenylphosphine are subjected to a reaction to generate a carbene, and then the carbene is subjected to a ring-closing reaction to generate an intermediate A-3; and the intermediate A-3 and bromobenzene are subjected to an Ullmann reaction to obtain 2-bromo-9-phenyl-9H-carbazole. The new method has the advantages of cheap and readily available raw materials, simple process, high yield, high continuous degree of reaction, short production cycle, low production cost and suitability for industrial production.

The novel positively-charged composite nanofiltration membrane is prepared on the basis of a nitrated aniline monomer. The preparation method of the composite membrane comprises the following steps: on a base membrane, performing interfacial polymerization reaction on water-phase monomers (nitrated aniline and piperazine) and acyl chloride monomers to form a separation layer; further, the Fe powder is used for converting nitryl into amido, so that the positively charged composite nanofiltration membrane is obtained. The preparation method of the positively charged composite nanofiltration membrane has the advantages of simplicity and convenience in operation, easiness in popularization and the like, has great application potential in the field of lithium extraction from salt lakes in China due to excellent ion separation performance, and is expected to realize high-efficiency low-carbon lithium enrichment.

The invention belongs to the technical field of organic matter degradation, and discloses application of a nano-silver catalyst in organic dye catalytic degradation. According to the invention, methylene blue, methyl orange, p-nitroaniline and p-nitrophenol are taken as examples for experiments, and the four dyes start to degrade after reacting for a period of time. In the four dyes, the catalytic effect of methylene blue is worst, and the degradation degree within 20 minutes after the nano-silver catalyst synthesized by biotransformation of the blue-like bacteria FL15 is added can reach the degradation degree of reaction for 6 hours when the catalyst is not added; the effect of catalyzing the degradation of methyl orange is the best, and the degradation rate can reach 95% or above within 10 min; the degradation rate of paranitroaniline and paranitrophenol can reach 95% or above within 20 min. Therefore, the activity of the AgNPs mediated and synthesized by the endophytic fungi FL15 is relatively strong.

The invention discloses benzimidazole quaternary ammonium salt as well as a preparation method and application thereof, and belongs to the field of chemical synthesis. According to the quaternary ammonium salt, N-methyl o-nitroaniline and p-vinylbenzoic acid serve as raw materials, 2-(4-vinylphenyl)-1-methyl-1H-1, 3-benzimidazole is obtained through condensation and cyclization, then the 2-(4-vinylphenyl)-1-methyl-1H-1, 3-benzimidazole reacts with iodomethane to obtain the benzimidazole quaternary ammonium salt, and the benzimidazole quaternary ammonium salt has a good sterilization effect.

The utility model discloses microwave vacuum drying equipment for ortho-nitroaniline, and belongs to the technical field of ortho-nitroaniline drying. The device comprises an outer machine shell, a feeding port is formed in one side of the outer machine shell, a sealing cover is movably hinged to one side of the feeding port, and a microwave generating device is fixedly arranged on the sealing cover; a crushing cylinder is rotationally arranged on the side, close to the feeding port, in the outer machine shell, the end, close to the feeding port, of the crushing cylinder is open, the other end of the crushing cylinder is blocked, screening holes are formed in the side wall of the crushing cylinder, the outer side of the crushing cylinder is slidably sleeved with a sealing cylinder, and the sealing cylinder is in sliding fit with the outer machine shell; a pushing mechanism used for pushing the sealing cylinder to move along the smashing cylinder is arranged on the outer machine shell. When the device is used, o-nitroaniline powder is heated through the microwave generating device, and the motor drives the crushing cylinder to rotate, so that the o-nitroaniline powder in the sealing cylinder can roll continuously, and the o-nitroaniline powder is uniformly heated.

The utility model discloses a feeding device for paranitroaniline production. The feeding device comprises a mixing tank body, when p-nitroaniline production feeding is carried out and a feeding cover on the left side needs to be opened, a pressing block is pressed towards the inner side, the pressing block drives a connecting plate and a sliding block to move towards the inner side along a sliding rail, the connecting plate drives a moving column to move towards the inner side, the moving column drives an inserting column to move towards the inner side, and the inserting column moves towards the inner side to extrude a reset spring; when an inserting column moves towards the inner side to an inserting hole to lose contact, a handle is held to pull up the feeding cover on the left side to open the feeding cover, after materials needing to be added are poured into the feeding box, a driving motor is started to drive a spiral conveying blade to rotate to convey the materials into the mixing tank body, and then paranitroaniline can be produced and processed; therefore, the charging device has the advantage of facilitating charging for paranitroaniline production, charging for paranitroaniline production can be automatically carried out, the blockage condition is avoided, and the paranitroaniline production time is shortened.

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 belongs to the technical field of synthesis of organic luminescent material intermediates, and particularly relates to a preparation method of 2-bromo-9-phenyl-9H-carbazole, which comprises the following steps: under inert gas, carrying out electrophilic aromatic substitution reaction on 2-nitroaniline and a brominating reagent to generate an intermediate A-1; under the acidic condition, sodium nitrite and the intermediate A-1 are subjected to a diazotization reaction to generate diazonium salt, and under the alkaline condition, the diazonium salt is coupled with benzene to generate an intermediate A-2; reacting the intermediate A-2 with triphenylphosphine to generate carbene, and cyclizing to generate an intermediate A-3; and carrying out Ullmann reaction on the intermediate A-3 and bromobenzene to obtain the 2-bromo-9-phenyl-9H-carbazole. The novel method provided by the invention has the advantages of cheap and easily available raw materials, simple process, high yield, high reaction continuity degree, short production period and low production cost, and is more suitable for industrial production.