61 results about "Dimethylaniline N-oxide" patented technology

The invention provides a preparation method of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: salifying 4-fluoro-3, 5-dimethylaniline serving as a substrate with concentrated hydrochloric acid, reacting with sodium nitrite to prepare a diazo solution, reducing the diazo solution into corresponding phenylhydrazine by using alkaline sodium sulfite as a reducing agent system, and reacting the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride with the diazo solution to prepare the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. And acidizing the 2, 5-dimethyl phenylhydrazine to obtain corresponding phenylhydrazine hydrochloride. According to the preparation method, sodium sulfite which is low in cost and easy to obtain is used as a reducing agent, the defects that metal residues are high, the environment is prone to being polluted and the raw material cost is high due to the fact that a metal reducing agent is adopted when phenylhydrazine hydrochloride is prepared in the prior art are overcome, the reaction is completed in a water phase, no organic solvent is adopted, and the concept of green chemistry is met; and the problems of complicated post-treatment and easy pollution caused by the adoption of an organic solvent can be effectively avoided.

The invention discloses a method for extracting and separating N-methylaniline and N, N-dimethylaniline, and relates to the technical field of organic compound separation.The method comprises the steps that a reaction product of aniline and methyl alcohol is taken and fed into an adsorption refiner to be adsorbed, and a mixture A is obtained; feeding the mixture A into a light component removal tower for light component removal, collecting at the top of the light component removal tower to obtain light components, feeding the light component removal tower into a heavy component removal tower for heavy component removal, and collecting at the top of the heavy component removal tower to obtain a mixture B; taking the mixture B, feeding from the middle part of an extractive distillation tower, taking an extracting agent, feeding from the upper part of the extractive distillation tower, and performing extractive distillation; collecting the N, N-dimethylaniline at the top of the extractive distillation tower to obtain N, N-dimethylaniline, and collecting the N, N-dimethylaniline at the bottom of the extractive distillation tower to obtain an N-methylaniline mixed solution; feeding the N-methylaniline mixed solution into a desorption tower for desorption; collecting at the top of the desorption tower to obtain N-methylaniline, and collecting at the bottom of the desorption tower to obtain the extracting agent.

The invention relates to the field of viscosity detection, and provides a fluorescent probe for detecting the viscosity of mask essence as well as a preparation method and application of the fluorescent probe. 4, 4 '-(iminomethylene) bis (N, N-dimethylaniline) which is slightly soluble in water reacts with acid to form auramine hydrochloride, the water solubility of the auramine hydrochloride fluorescent probe is greatly enhanced, the probe in a water phase is converted into heat (non-radiation decay) due to twisted intramolecular charge transfer and excited state energy caused by benzene ring rotation, and fluorescence quenching is shown; when the viscosity of the solvent is increased, rotation of the benzene ring is blocked, excited state energy cannot be converted into heat and is dissipated in a radiation attenuation mode, fluorescence is enhanced, and viscosity detection of the mask essence with the main component being water is achieved based on the principle. According to the present invention, the method has characteristics of simple synthesis, stable property, no interference of solvent polarity during detection, long-term storage and long-term use, rapid and high-specificity viscosity response ability, and quantitative analysis of viscosity.

The application discloses a synthesis method of 2,3,3',4'-biphenyl tetracarboxylic dianhydride, characterized in that 2,3-dimethylaniline is used as a starting raw material, 2,3-dimethylaniline diazonium salt is prepared through a diazotization reaction, then 2,3,3',4'-tetramethyl biphenyl is prepared through a coupling reaction of the 2,3-dimethylaniline diazonium salt and o-xylene under the catalysis of cuprous chloride, and finally 2,3,3',4'-biphenyl tetracarboxylic dianhydride is prepared through an oxidation reaction and dehydration to form anhydride. The coupling reaction in the synthesis method has good selectivity, 3,3,4',4'-tetramethyl biphenyl which is difficult to separate is not generated, high-purity a-BPDA can be finally obtained, and the coupling reaction in the synthesis method only needs to use low-cost cuprous chloride as a catalyst, so that the production cost is greatly reduced compared to a high-cost catalytic system in the prior art, and the synthesis method is more suitable for industrial mass production.

This invention relates to the field of polyaniline derivative preparation technology, and more particularly to a green preparation method for poly(2,3-dimethylaniline). The green preparation method provided by this invention includes mixing a reaction mother liquor for preparing poly(2,3-dimethylaniline), a nitric acid solution, and 2,3-dimethylaniline, and then adding Fe... 3+ The catalyst is subjected to a first heat treatment, hydrogen peroxide is added, and a second heat treatment is performed to obtain a first-use reaction mother liquor and a filter cake. The filter cake is post-treated to obtain the poly-2,3-dimethylaniline. The first-use reaction mother liquor is recycled according to the above process. During the above recycling process, when the COD content in the reaction mother liquor obtained after recycling is greater than 29000 mg / L, the molar ratio of H2O2 to 2,3-dimethylaniline in hydrogen peroxide is increased based on the molar ratio of H2O2 to 2,3-dimethylaniline in hydrogen peroxide during the first recycling process. The preparation method has high yield and is environmentally friendly.

The invention discloses a method for synthesizing 2-aminopyridine, comprising using polystyrene resin beads as a carrier, a mixed solvent consisting of 1,2-dichloroethane and anhydrous ethanol as a porogen, adding the polystyrene resin beads and the mixed solvent to a flask for swelling; adding N,N-dimethylaniline to the flask, and performing a stirring reflux reaction; repeatedly washing the mixed solution in the flask with anhydrous ethanol and filtering it with suction, and finally vacuum drying it at room temperature. The method for synthesizing 2-aminopyridine utilizes polymer resin beads as a carrier, grafts a preferred highly active phase transfer catalyst molecule - N,N-dimethylaniline, and synthesizes a solid-supported phase transfer catalyst to achieve efficient recycling and regeneration of the phase transfer catalyst, and ensures the yield of the pyridine amination product by the solid-supported phase transfer catalyst, which is conducive to ensuring the efficient resource utilization of basic nitrogen heterocyclic compounds in coal tar.

This invention belongs to the field of coating technology and relates to a high-temperature resistant CHPO curable putty and its preparation method, which comprises the following components: unsaturated polyester resin, styrene, cobalt isooctanoate, dimethylaniline, high-temperature resistant composite dispersant, hydrogenated castor oil, silica, rutile titanium dioxide, talc, and curing agent.

This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. The adhesive comprises a resin component and a curing component. The resin component includes maleic anhydride, phthalic anhydride, diol, catalyst, polymerization inhibitor, and crosslinking monomers, etc., and the diol includes at least 1,2-propanediol. The curing component includes an accelerator composed of dimethylaniline and zinc adipate, and a benzoyl peroxide initiator. The adhesive of this invention is colorless and transparent after curing, exhibits excellent resistance to yellowing, is easy to apply, and after curing with fillers, possesses excellent shear strength, water shear strength, and impact resistance. It can be widely used in high-end stone splicing, repair, and craft bonding.

The invention discloses a catalyst for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through continuous catalytic hydrogenation and a preparation method and application thereof, the catalyst comprises a carrier, and an active component platinum and an auxiliary component which are loaded on the carrier, the auxiliary component is at least one of sodium citrate, disodium ethylene diamine tetraacetate, sodium metavanadate, oxalic acid, zirconium oxychloride, yttrium nitrate or sodium carbonate; and the active component and the auxiliary component both account for 0.1-10% of the mass of the catalyst. The catalyst is used for preparing N-(1-ethyl propyl)-3, 4-dimethylaniline through hydrogenation, the reaction can be continuous, the safety performance is better, and the catalyst has high catalytic activity and stability.

This invention relates to a toothpaste flavoring with a long-lasting fresh breath effect and its preparation method. The core component of this toothpaste flavoring is modified menthol. Modified menthol reacts with amino acid compounds to form a menthol-amino acid complex, which is then coated with β-cyclodextrin to form a menthol-amino acid-β-cyclodextrin complex. This dual synergistic effect effectively prolongs the duration of its fresh breath effect. The toothpaste flavoring also includes 2,6-dimethylaniline, flavor enhancers, emulsifiers, stabilizers, aroma retardants, and preservatives to ensure aroma stability and safety for oral use. This invention provides a longer-lasting fresh breath effect, solving the problems of rapid evaporation and short-lasting freshness in traditional toothpaste flavorings, and has good market application prospects.

The present invention relates to the technical field of concrete materials. Disclosed are a modified epoxy resin and a preparation method therefor, a composition for an epoxy resin grouting material, an epoxy resin grouting material, a preparation method therefor, and a use thereof. The method for preparing the modified epoxy resin comprises: heating a polyhydroxy compound and an epoxy resin at 80-100ºC in a nitrogen atmosphere in the presence of a catalyst to obtain the modified epoxy resin, wherein the molar ratio of the polyhydroxy compound, the epoxy resin, and the catalyst is 1:1-2:0.05-0.1; the epoxy resin is a bisphenol A epoxy resin; the catalyst is selected from any one of sodium hydroxide, potassium carbonate, and dimethylaniline; and the polyhydroxy compound is selected from at least one of glycerol, ethylene glycol, propylene glycol, glucose, and butylene glycol. The epoxy resin grouting material of the present invention has more excellent toughness and lower viscosity, and good bonding strength and bonding durability with a concrete matrix.

The application provides a low-yellowing fluorine-free semi-alicyclic polyimide composition and a preparation method thereof, and relates to the technical field of polyimide preparation.The semi-alicyclic polyimide composition is prepared by polymerization reaction of diamine and dianhydride; the diamine comprises first diamine and second diamine; the first diamine is 4,4'-diamino diphenyl ether-2,2'-disulfonic acid and / or 4-(4-aminophenoxy)-2,6-dimethyl aniline; the second diamine is 4,4'-diamino dicyclohexyl methane and / or 3,3'-dimethyl-4,4'-diamino dicyclohexyl methane; and the dianhydride is fluorine-free dianhydride. The semi-alicyclic polyimide composition prepared by the application significantly improves the optical performance of the polyimide film prepared therefrom, and the anti-yellowing effect is significantly improved.

The invention discloses a waterproof fiber composite board and a preparation method thereof, and belongs to the technical field of fiber composite boards. The preparation method comprises the following steps: mixing and stirring fir wood fibers, maleic anhydride, benzoyl peroxide and N, N-dimethylaniline for reaction to obtain pretreated wood fibers; the pretreated wood fibers and phenolic resin with the solid content being 50% are mixed to obtain a wood matrix material, modified pollen, modified lotus leaf wax, stannous octoate and modified aerogel are added, and the mixture is stirred and mixed to obtain functional slurry; and pouring the functional slurry into a mold, and carrying out hot pressing treatment to obtain the waterproof fiber composite board. Chemical bonding of the modified aerogel, the pretreated wood fiber and the modified pollen is achieved through an isocyanate group, and a continuous heat preservation network is constructed to achieve the heat preservation property; phenolic resin, modified pollen and modified lotus leaf wax form double waterproof barriers, so that the problem that hydrophobic components are easy to migrate is solved; all the components have a synergistic effect, so that the product has excellent water resistance, antibacterial property, thermal insulation property, mechanical property and thermal stability.

The present invention discloses a method for preparing polyurethane microcapsule shells by direct crosslinking of cellulose and polyisocyanate, including: mixing cellulose crystals with deionized water uniformly to obtain an aqueous phase; mixing N,N-dimethylaniline, toluene, and polyisocyanate uniformly to form an oil phase; stirring the oil phase into the aqueous phase for 20 minutes to form an emulsion; and heating and stirring the emulsion, then standing the emulsion for 2 hours, cooling the emulsion to room temperature, and performing filtration, washing, re-filtration, and drying to obtain the polyurethane microcapsule shells. Rigid polyurethane structural shells with high-density carbamate groups are generated. Such direct crosslinking enhances the stability of microcapsules, enabling more reliable product quality.

The application provides a double-curing acrylate-epoxy hybrid adhesive as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The double-curing acrylate-epoxy hybrid adhesive is composed of component A and component B. The component A comprises tetrahydrofurfuryl methacrylate, isobornyl methacrylate, hydroxypropyl methacrylate, N,N-dimethylaniline, a toughening agent, a double-curing resin, wollastonite, fumed silica, solid glass microbeads, an antioxidant, a phosphate monomer and a multifunctional monomer. The component B comprises benzoyl peroxide, an epoxy resin, wollastonite and fumed silica. The double-curing acrylate-epoxy hybrid adhesive prepared by the application can realize the combination of high-temperature strength and normal-temperature toughness, and solves the problem of easy gelation of a traditional NCO-containing system.

This invention discloses a berberine-dimethylaniline photosensitizer, its preparation method, and its application, belonging to the field of biomedical technology. The method involves sequentially reacting berberine with magnesium methyl bromide via Grignard addition, followed by bromomethylation with N-bromosuccinimide, and basic condensation with dimethylaminobenzaldehyde, then demethylating under high temperature and vacuum to obtain the active berberine-dimethylaniline. Finally, it undergoes weakly alkaline treatment to obtain the inactivated berberine-dimethylaniline. This invention introduces the electron-donating group dimethylaniline onto the berberine backbone, constructing an electron push-pull structure that red-shifts the absorption wavelength, facilitating deeper tissue penetration. Furthermore, this photosensitizer maintains high activity in the weakly acidic microenvironment of tumors while remaining inactive under normal physiological conditions, thereby achieving intelligent "on-off" regulation based on pH differences, improving the safety and precision of photodynamic therapy for tumors.

The present application relates to the technical field of lithium ion batteries, and discloses a slurry for a battery separator, a thermally responsive safety separator, application of the thermally responsive safety separator, and a thermally responsive safety lithium ion battery.The slurry contains microspheres A, microspheres B, a thickening agent, and a binder; wherein, based on the total weight of the slurry, the content of microspheres A is 30-50 wt%, and the content of microspheres B is 25-48 wt%; the material forming microspheres A includes initiator A; the material forming microspheres B includes initiator B; initiator A is a peroxide; and initiator B is selected from at least one of oxalic acid, glucose, N,N-dimethylaniline, a naphthenate, n-dodecanethiol, triethylaluminum, and triethylboron.The thermally responsive safety separator formed from the slurry for a battery separator according to the present application is applied to a lithium ion battery containing a thermally polymerizable monomer, can operate normally under conventional working conditions, and can cut off the internal ion channel during thermal runaway of the battery, thereby avoiding smoking, fire, and explosion of the battery.

The present application relates to a kind of wastewater treatment processes for 4,6-dichloropyrimidine synthesis, acidic waste liquid generated by substitution reaction, after first static stratification, distillation, second static stratification, then adding 1-naphthylamine diazonium salt wastewater treatment, while recovering normal organic amine odor compound fertilizer raw material, N,N-dimethyl aniline difficult to remove in wastewater can be removed, reduce the consumption of decoloring agent in subsequent decoloring treatment, solve the problem that wastewater generated in the preparation of 4,6-dichloropyrimidine is difficult to handle and utilize.

The invention relates to a multi-tower rectification method and a multi-tower rectification system. The multi-tower rectification method comprises the following steps that a fresh material to be separated is introduced into a first rectification tower to be subjected to first rectification treatment, a tower top gas-phase product and a first tower bottom product are formed, and the mass content of N, N-dimethylaniline in the first tower bottom product is 2%-9%; the tower top gas-phase product passes through a second reboiler to release heat, and after a second rectifying tower is heated, a first tower top product is formed; the first tower bottom product is introduced into a second rectifying tower to be subjected to second rectifying treatment, a second tower top product and a second tower bottom product are formed, and the mass content of N-methylaniline in the second tower top product is larger than or equal to 20%. On the basis of reducing the overall energy consumption cost, a high-purity product can be obtained.

The invention discloses a preparation method of a vitamin B2 diastereoisomer, which comprises the following steps: adding absolute ethyl alcohol into a high-pressure reaction kettle, adding 3, 4-dimethylaniline, D-arabinose and palladium carbon in a stirring state, introducing hydrogen, heating for reaction, and filtering while hot; cooling, crystallizing and filtering the filtrate, collecting a filter cake, dissolving the filter cake with a hydrochloric acid aqueous solution, adding aniline diazonium salt in a stirring state, after the reaction is completed, adding sodium acetate for crystallizing and filtering, and adding the filter cake into a mixed solution of a solvent A and barbituric acid for reflux reaction; cooling to room temperature and filtering to obtain a vitamin B2 diastereoisomer crude product; adding inorganic acid B into the crude wet filter cake for dissolving, adding into hot water, filtering while hot, and drying the diastereoisomer of the vitamin B2. The whole process steps are simple and easy to operate, all the raw materials required for preparation are common and easily available raw material substances, and meanwhile, the vitamin B2 diastereoisomer prepared by the whole preparation process is relatively high in purity, so that the whole preparation efficiency and quality are ensured.

The invention discloses a high-temperature-resistant high-resilience self-repairing polyurethane elastomer and a preparation method thereof, and relates to the technical field of self-repairing. The preparation method comprises the following steps: taking polytetrahydrofuran glycol, vacuumizing and dehydrating; introducing nitrogen, adding isophorone diisocyanate and dibutyltin dilaurate, and carrying out a reaction so as to obtain a polyurethane prepolymer; taking a polyurethane prepolymer, introducing nitrogen, adding a chain extender A and a chain extender B, stirring, adding the mixed solution, and stirring; adding a metal salt solution and N, N-dimethylaniline, and uniformly mixing; putting the mixture into a polytetrafluoroethylene mold, reacting, vacuumizing, removing bubbles, curing, cooling and demolding to obtain the high-temperature-resistant high-resilience self-repairing polyurethane elastomer. Amino groups of 2, 6-diaminopyridine react with isocyanate groups of the polyurethane prepolymer, and 2, 6-diaminopyridine and metal ions in the metal salt solution are coordinated to form metal coordination bonds, so that the high-temperature resistance, resilience and self-repairing performance of the polyurethane elastomer are improved.

The invention discloses a continuous reaction research process of low-biphenylamine impurity 2, 4-dimethyl-bis-acetanilide, and belongs to the field of chemical synthesis. The invention aims to provide the continuous reaction research process for the low-bis-phenylamine impurity 2, 4-dimethyl-bis-acetanilide (2, 4-dimethyl-N-acetoacetanilide), the retention time of the 2, 4-dimethyl-N-acetoacetanilide raw material is shortened, the bis (2, 4-dimethyl phenyl) amine impurity is reduced, the yield of the 2, 4-dimethyl-N-acetoacetanilide is increased, and the production cost is reduced. Meanwhile, the auto-polymerization of the diketene is reduced, the consumption of the 2, 4-dimethylaniline is reduced, and the problems of high impurity content of the bis (2, 4-dimethylphenyl) amine in the existing 2, 4-dimethyl-N-acetoacetanilide and poor batch stability are solved.

The invention belongs to the technical field of pharmaceutical preparations, and relates to lidocaine hydrochloride gel and a preparation method thereof, and the preparation method comprises the following steps: 1) dissolving and dispersing a bacteriostatic agent and a gel matrix with water, and sterilizing to obtain a gel solution; 2) dissolving lidocaine hydrochloride with water, adjusting the pH value of the solution, and performing rapid heating and cooling sterilization to obtain a lidocaine hydrochloride solution; and (3) adding a lidocaine hydrochloride solution into the gel solution under a sterile condition, and stirring and mixing the lidocaine hydrochloride solution and the gel solution. By adjusting and changing the production and preparation process of lidocaine hydrochloride, the exposure time of lidocaine under a high-temperature condition is reduced, the degradation of lidocaine is further reduced, the content level of 2, 6-dimethylaniline is effectively reduced, the stability and quality of the product are improved, and toxic and side effects on patients are reduced; and the production process is simple and convenient to operate, the production time of the lidocaine hydrochloride gel is shortened, the working efficiency is improved, and the cost is saved.

The present disclosure provides for methods of producing analgesia in a subject. In some cases, methods produce analgesia in a subject undergoing arthroscopic subacromial decompression surgery. The present disclosure also relates to improved sustained release drug delivery systems. In some cases, a composition comprises an active pharmaceutical agent; at least one of sucrose acetate isobutyrate and a polyorthoester; an organic solvent; and 2,6-dimethylaniline, wherein the 2,6-dimethylaniline is present at a level less than 500 ppm. In some cases, a composition comprises bupivacaine N-oxide at a level less than 1 wt %, based on weight of the composition. In some cases, a composition comprises metal present at a level less than 5 ppm. Dosage forms and methods are also provided.

The application belongs to the technical field of organic polymer compound preparation, and relates to an oilfield water injection and polymer injection glass steel pipeline material and a preparation method, which comprises, from inside to outside, an anticorrosive wear-resistant inner layer and a high-pressure anti-aging outer layer; the anticorrosive wear-resistant inner layer comprises epoxy vinyl ester resin, graphene-polytetrafluoroethylene composite powder, nano silicon dioxide, nano zinc oxide, isothiazolinone microbial inhibitor, methyl tetrahydrophthalic anhydride curing agent and dimethyl aniline accelerator; the high-pressure anti-aging outer layer comprises bisphenol A type epoxy resin, phenolic resin, surface modified glass fiber, nano silicon carbide, aromatic amine curing agent, triethanolamine accelerator, polysulfide rubber toughening agent, ultraviolet absorber, antioxidant and nano boron nitride; through overall cooperation of component matching and process improvement, the performance is obviously improved, the oilfield water injection and polymer injection complex working conditions are adapted, and a plurality of technical shortcomings of the existing glass steel pipeline are solved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of novel tiamulin fumarate. The preparation method comprises the following steps: reacting pleuromutilin with thionyl chloride to generate chlorinated pleuromutilin; reacting the chlorinated pleuromutilin with thiourea, and carrying out alkali treatment, so as to generate sulfhydrylated pleuromutilin; the preparation method comprises the following steps: reacting sulfhydrylated pleuromutilin with 2-bromo-N, N-diethyl ethyl-1-amine to form tiamulin, and finally carrying out a salt forming reaction. The invention provides a synthetic route of chlorination, sulfhydrylation, alkylation and salification, and two key intermediates, namely the chlorinated pleuromutilin and the sulfhydrylated pleuromutilin, are prepared step by step, so that the accurate control of the reaction process is realized. Wherein the chlorination reaction is catalyzed by N, N-dimethylaniline, the low-temperature staged reaction is adopted, and the selectivity is good; thiourea is used for alkaline hydrolysis in sulfhydrylation, so that foul mercaptan is avoided; alkylation is carried out under weak base and low temperature; no controlled reagent is needed in the whole process, and green chemical requirements are met.

The invention relates to the technical field of hydrogel, in particular to hydrogel based on an acrylonitrile acrylamide copolymerization system and a preparation method of the hydrogel. The preparation method comprises the following steps: preparing a copolymerization solution by taking an acrylonitrile monomer and an acrylamide monomer as raw materials, wherein the molar ratio of the acrylonitrile monomer to the acrylamide monomer is (3: 7)-(5: 5); an initiator is added into the copolymerization liquid, the mixture is subjected to a polymerization reaction at the temperature of 40-50 DEG C, organogel is obtained, and the initiator is composed of dibenzoyl peroxide and N, N-dimethylaniline according to the molar ratio of 1: 1; and replacing the solvent in the organic gel with water. Compared with the prior art, the preparation method has the advantages that acrylamide is utilized to construct a high-hydrophilicity and high-entanglement network framework, so that the material is ensured to have good flexibility and ductility; meanwhile, an acrylonitrile monomer containing a strong-polarity cyano group is introduced, and a high-strength physical cross-linking area is dynamically constructed under the action of external force through dipole-dipole interaction formed by the acrylonitrile monomer, so that network dynamic enhancement and strain hardening response are realized.

The present invention provides a mepivacaine preparation method, which comprises that in an organic solvent, 1-methylpiperidine-2-formic acid and 2, 6-dimethylaniline are subjected to a condensation reaction in the presence of a condensing agent to obtain mepivacaine, and the condensing agent is selected from one or more of phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride. The condensing agent used for preparing mepivacaine is one or more of phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride, toxic substances such as phosgene and the like are not generated, the safety is high, the cost is low, and the preparation method is suitable for industrial popularization.

The invention relates to the technical field of preparation of alkylation catalysts, and discloses an alkylation catalyst, a preparation method and application thereof, and a synthesis method of N, N-dimethylaniline. The invention relates to an alkylation catalyst, which comprises Cu, an auxiliary active component and a carrier, the auxiliary active component is selected from at least one of VIII group metal and VIB group metal; the carrier comprises a molecular sieve and a binder; wherein the ratio of Cu < + > to Cu < 2 + > in the catalyst is 0.1-0.4. The catalyst has a specific Cu < + > / Cu < 2 + > ratio, and the activity, the stability and the service life of the catalyst can be improved.

This invention relates to the field of dehydroabietic acid compounds, specifically disclosing the preparation method and application of dehydroabietic acid-based D-A type polar responsive fluorescent compounds. These compounds include dehydroabietic acid thiadiazole-carbazole, dehydroabietic acid thiadiazole-triphenylamine, dehydroabietic acid thiadiazole-dimethylaniline, and dehydroabietic acid thiadiazole-phenoxazine. This invention introduces groups with different electron-donating abilities onto the natural acceptor dehydroabietic acid thiadiazole to obtain dehydroabietic acid-based D-A type fluorescent compounds, thus developing dehydroabietic acid-based D-A type fluorescent compounds for the first time. These dehydroabietic acid-based D-A type fluorescent compounds exhibit good fluorescence performance accompanied by a redshift in fluorescence wavelength due to increased electron-donating ability, while also possessing good polar response performance. Among them, the good biocompatibility and steroid-like skeleton structure of dehydroabietic acid thiadiazole-dimethylaniline enable specific targeting of lipid droplets, making it a promising fluorescent probe for application in the field of bioimaging and demonstrating excellent practicality.