607 results about "Triphenylphosphine" patented technology

The invention provides a preparation method of mitochondria-targeted antioxidant hybrid vesicles. The preparation method comprises the following steps: S1, preparing and separating adipose-derived stem cell nano-vesicles; s2, preparing a liposome loaded with dihydromyricetin and distearoyl phosphatidyl ethanolamine-polyethylene glycol 2000-triphenylphosphine targeting peptide by an ethanol injection method; and S3, preparing the hybrid nano vesicles loaded with the dihydromyricetin and the distearoyl phosphatidyl ethanolamine-polyethylene glycol 2000-triphenylphosphine targeting peptide. The invention also provides the hybrid vesicles prepared by the method and application of the hybrid vesicles in preparation of refractory diabetes wound treatment drugs. The lipidosome and the adipose-derived stem cell nano-vesicles are hybridized to prepare the hybridized vesicles capable of targeting mitochondria and resisting oxidation, the hybridized vesicles are applied to wound treatment for the first time, the problem of oxidative stress of diabetic wounds is solved, wound healing is accelerated, and a new strategy is provided for optimizing mitochondrial function defects and oxidative stress of the diabetic wounds.

The invention provides a zirconium boride / graphene complex-phase wear-resistant and high-temperature-resistant ceramic material and a preparation method thereof, and belongs to the technical field of ceramics. The preparation method comprises the following steps: pretreating graphene, preparing titanium dioxide / graphene microspheres, modifying the titanium dioxide / graphene microspheres, functionalizing the titanium dioxide / graphene microspheres, preparing a ceramic mixture, molding and sintering. The step of functionalizing the titanium dioxide / graphene microspheres comprises the following steps: putting the modified titanium dioxide / graphene microspheres into xylene, adding bisphenol A epoxy resin and triphenylphosphine, raising the temperature, carrying out stirring reaction, filtering out, washing, putting into N, N-dimethylformamide, uniformly stirring, adding gallic acid and p-toluenesulfonic acid, and carrying out ultrasonic treatment to obtain the titanium dioxide / graphene microspheres. Raising the temperature for reaction, filtering, washing and drying after the reaction is finished, so as to prepare functionalized titanium dioxide / graphene microspheres; the prepared ceramic material is high in strength, good in wear resistance and excellent in high temperature resistance.

The application discloses a preparation method of carbon aerogel material for light electromagnetic shielding, and comprises the following steps: adding resorcinol, phloroglucinol, a template agent and formaldehyde into pure water, stirring and dissolving to obtain a precursor solution; adding the precursor solution into white oil containing a surfactant, emulsifying, heating in an oil bath and fully reacting; centrifugal separation to obtain powder, high-temperature carbonization, dispersion in oleylamine, addition into a stock solution containing nickel acetylacetonate, triphenylphosphine and oleylamine, high-temperature reaction and cooling, addition of a mixture of hexane and ethanol to obtain a product; centrifugal separation and washing to obtain light high-electromagnetic-shielding carbon aerogel. The carbon aerogel material for light electromagnetic shielding prepared by the method has the advantages of small density, high efficiency, corrosion resistance, high electromagnetic shielding efficiency, high product yield and the like, and by controlling the nucleation and growth rate of Ni2P, the Ni2P nanoparticles can be uniformly grown on the carbon aerogel microspheres, and the method is suitable for application in large-scale industrial production.

The invention discloses a high-bonding-strength conductive adhesive and a preparation method and application thereof.The preparation method comprises the following steps that S1, epoxy resin E51 is placed in a three-neck flask, acetone is added, stirring is conducted till the epoxy resin E51 is completely dissolved, and ethidene diamine is slowly dropwise added; s2, under the protection of nitrogen, heating to 70-80 DEG C, adding a catalyst triphenylphosphine, carrying out a constant-temperature reaction, after the reaction is completed, cooling to 35-45 DEG C, adding deionized water, and stirring; s3, acetone and unreacted ethylenediamine are removed, then deionized water is used for washing, an obtained product is placed in a vacuum drying oven to be dried, and amino modified epoxy resin of faint yellow viscous liquid is obtained; s4, mixing the amino modified epoxy resin with an anhydride curing agent, a conductive filler, a diluent and a coupling agent; and S5, fully stirring the mixture, carrying out vacuum defoaming, and uniformly stirring to obtain the conductive adhesive. According to the invention, the shearing strength of the chip and the copper bracket can be improved to more than 30MPa.

The invention relates to the technical field of protective films, in particular to a high-light-transmittance label protective film and a preparation method thereof.A multi-layer protective film formed by compounding a release film layer, an adhesive layer, a PET film and a protective layer is constructed; composite vinyl ester resin constructed by taking epoxy resin and acrylic acid as raw materials is subjected to toughening modification, and then a linear reactive diluent is compounded to construct a high-toughness protective layer which is resistant to high temperature and aging and can be photo-cured; long-chain alkane modified nano silicon dioxide is introduced into the protective coating, nano silicon dioxide is aminated by 3-aminopropyltriethoxysilane, and then 17-carbon monoisocyanate prepared by taking acetone, stearic acid, triphenylphosphine, sodium azide and N-chlorosuccinimide as raw materials is grafted to form the long-chain alkane modified nano silicon dioxide. Vinyl butadiene styrene rubber, composite vinyl ester resin, tackifying resin, a softening agent and a photoinitiator are mixed to prepare the adhesive layer.

A silicone hydrogel contact lens formulation comprising [a] at least 40 wt% of a polymerisable siloxane, [b] at least 30 wt% of hydrophilic N-vinyl amide monomer, such as vinyl-N-methyl acetamide (VMA), N-vinyl pyrrolidone (NVP), N-vinyl formamide, or N-vinyl acetamide; [c] triphenylphosphine (TPP) and [d] 1,4-bis[(2-methacryloxyethyl)amino]-9,10-anthraquinone (RB247). The contact lens formulation can further comprise an anthraquinone blue tinting agent, a benzophenone UV-absorbing agent and / or a benzotriazole HEVL absorber to stabilise the silicone hydrogel contact lens formulation.

The present disclosure discloses a photocatalyst for hydrogen production from water. The photocatalyst comprises triphenylphosphine ruthenium (RuP) complex. The RuP complex is a co-catalyst with graphitic carbon nitride. The present disclosure also discloses a method of synthesizing a photocatalyst for hydrogen production from water. The method comprises forming a suspension of graphitic carbon nitride; adding triphenylphosphine ruthenium complex (RuP) to the suspension; and drying the suspension to form dried graphitic carbon nitride integrated with RuP.

The invention relates to the technical field of water treatment, in particular to a method for preparing a quaternized modified tannin-based organic flocculant through irradiation grafting, a product prepared through the method and application of the quaternized modified tannin-based organic flocculant. The method comprises the following steps: (1) under the irradiation of 30-60 mW / cm < 2 > of ultraviolet light, adding brominated vinyl triphenylphosphine into a mixture of tannic acid and a photoinitiator for reaction; (2) adjusting the ultraviolet intensity to 5-20 mW / cm < 2 > for reaction; (3) closing the ultraviolet reaction; and (4) precipitating the product with ethanol, filtering and washing to obtain the quaternary phosphonium modified tannin-based organic flocculant. Wherein the photoinitiator is selected from one of benzophenone and benzoin dimethyl ether. The quaternized modified tannin-based organic flocculant provided by the invention can efficiently remove algae in a water body in an environment-friendly manner, and avoids secondary pollution caused by algae cell rupture at the same time.

The invention belongs to the technical field of polyether polyol preparation, and discloses a synthesis method of propylene glycol polyether. The synthesis method comprises the following steps: mixing propylene glycol, an organic boron catalyst and a cocatalyst, then introducing alkylene oxide at 10-80 DEG C for reaction, adding a solvent into a reaction system after the reaction is finished, and carrying out reduced pressure distillation, washing and drying to obtain propylene glycol polyether, the cocatalyst is selected from one or a combination of at least two of trimethylphosphine, triethylphosphine, triphenylphosphine, tris (dimethylamino) phosphine and tripyrrolidine phosphine. According to the invention, the organic boron catalyst and the cocatalyst phosphine salt are matched for use, and the cocatalyst is selected, so that the reaction can be carried out under a relatively wide temperature condition, and the propylene glycol polyether with controllable molecular weight and narrow distribution is prepared.

The invention discloses a catalyst and a method for preparing 5-methoxy-4, 6-dichloropyrimidine through Kirschner reaction, and belongs to the technical field of catalysts, the catalyst comprises modified triphenylphosphine, a cocatalyst, a silane coupling agent and a spherical alumina carrier; the cocatalyst is prepared from the following raw materials: lignin, a NaOH solution and a K2S2O8 solution. According to the invention, modified triphenylphosphine is used as a core catalytic active component, and a reaction product of lignin and K2S2O8 in an alkaline environment is ingeniously used as an auxiliary catalyst. Through mediation of a silane coupling agent, the two raw materials are efficiently compounded on a spherical alumina carrier, so that the efficient catalyst special for synthesizing the 5-methoxy-4, 6-dichloropyrimidine through Kirschner reaction is prepared. Compared with the traditional technical means, the method has the advantages that the yield is obviously improved, and the leap in yield is realized. In addition, it is worthy of mentioning that the production process is greatly accelerated, and the overall production efficiency is improved.

The invention relates to a specific PET molecular probe of a targeted KRASG12D mutant as well as a preparation method and application of the specific PET molecular probe. Pyridopyrimidine compounds and R5 are subjected to cooling reaction under the action of N, N-diisopropylethylamine to generate a compound 2; the compound 2 and (2-fluorotetrahydro-1H-pyrrolizine-7A (5H)-yl) methanol are subjected to a heating reaction under the action of N, N-diisopropylethylamine, and a compound 3 is generated; carrying out heating reaction on the compound 3 and biphenyl boronic acid pinacol ester under the action of N, N-diisopropylethylamine and tetrakis (triphenylphosphine) palladium to generate a compound 4; carrying out heating reaction on the compound 4 and 1, 2-bis (tolyloxy) alkane under the action of potassium carbonate to generate a compound 5; the compound 5, radioisotope < 18 > F and an anion complexing agent are subjected to a heating reaction under the action of potassium carbonate to generate the trisubstituted pyridopyrimidine < 18 > F labeled PET molecular probe. Compared with the prior art, the kit has a positioning diagnosis effect on KRASG12D mutant tumors, and image typing of mutant and non-mutant tumors and pathological evaluation after tumor treatment are realized at the same time.

The invention discloses a preparation method of 3, 6-dichloropyridazine, and belongs to the technical field of chemistry. According to the method, 3, 6-dihydroxypyridazine is used as a raw material, an organic solvent and triphenylphosphine oxide are combined to form a dichlorotriphenylphosphine intermediate state which is used as a chlorinating agent, dihydroxyl is substituted to generate 3, 6-dichloropyridazine, triphenylphosphine oxide and solid light are used as raw materials, heating reaction is performed to prepare 3, 6-dichloropyridazine, meanwhile, a one-pot method can be adopted in the two-step reaction, and operation is easy and convenient. The novel preparation method for synthesizing 3, 6-dichloropyridazine provided by the invention has the advantages of low raw material cost, high yield, high gas phase purity and no pollution, is suitable for industrial production, can meet industrial requirements, provides a new idea for later preparation of 3, 6-dichloropyridazine, has the remarkable advantages of high gas phase purity and high yield, and is suitable for industrial production. Wide application prospects are realized.

The invention belongs to the technical field of light-emitting hybrid materials, and particularly discloses a preparation method and application of an efficient blue light emitting hybrid material. The preparation method comprises the following steps: dispersing cuprous halide, triphenylphosphine (tpp) and tetraethylammonium halide in N, N-dimethylformamide (DMF) according to a molar ratio of 1: 1: 1 to form a uniform solution, and performing ultrasonic treatment at room temperature to generate luminescent powder; and washing, centrifuging and drying in vacuum to obtain the hybrid material. The highest photoluminescence quantum yield is up to 70%, and the luminescence mechanism is thermally activated delayed fluorescence. The material can be used for a white light LED (CIE coordinate (0.33, 0.33)) and an X-ray scintillator (the light yield is 32537 photons / MeV, and the spatial resolution is 20lpmm <-1 >), and has the characteristics of simple preparation and excellent performance.

The invention relates to the technical field of biomedical materials, in particular to a preparation method of TPP-mediated mitochondrial-targeted cerium-doped antioxidant carbon quantum dots, which comprises the following steps: mixing citric acid, urea and cerium salt serving as raw materials, and reacting by adopting a hydrothermal method to synthesize the cerium-doped carbon quantum dots; then triphenylphosphine is grafted to the surface of the cerium-doped carbon quantum dot through an amide method, separation and purification are carried out after the reaction is completed, the target carbon quantum dot is obtained, and the cerium element in the cerium salt is used for endowing the carbon quantum dot with an anti-oxidation function. The carbon quantum dots prepared by the method are accurate in mitochondria targeting and strong in oxidation resistance, the preparation process is simple, convenient, environment-friendly and large-scale, and the product is uniform in particle size, stable in fluorescence, good in biocompatibility and wide in application prospect in the field of biomedicine.

The invention discloses a method for co-producing triphenylphosphine and silicon tetrachloride, which comprises the following steps: S1, mixing triphenylphosphine oxide with a solvent, heating to 90-110 DEG C, and dropwise adding trichlorosilane to carry out reduction reaction; the reaction pressure is controlled to be 0.12 to 0.20 Mpa absolute pressure; s2, the reaction temperature is kept not lower than 90 DEG C, preferably 90-110 DEG C, meanwhile, the system pressure is adjusted to be negative pressure, and the reaction continues for 0.5-3 h; and after the reaction is completed, rectifying and separating out silicon tetrachloride, adding water into the residual reaction liquid for quenching, filtering out insoluble substances, and removing the solvent to obtain the triphenylphosphine. According to the method, high-purity triphenylphosphine can be obtained with high yield, the electronic-grade silicon tetrachloride is co-produced, the generation of silicon dioxide is reduced, the gel coating problem of the silicon dioxide and the product loss are reduced, the post-treatment is more convenient, and the method is suitable for industrial production.

The invention discloses an agricultural synergist containing astragalus polysaccharide and application of the agricultural synergist, and belongs to the technical field of killing agents for biopesticides. The synergist comprises astragalus polysaccharide, a polysorbate / lecithin compound emulsifier, a carboxymethyl chitosan / siloxane penetrant and a modified accelerant synthesized by palladium catalysis. Polysaccharide is structurally modified through a blue light LED induced tetra (triphenylphosphine) palladium catalytic reaction, and the epidermal penetration efficiency of the biopesticide on tetranychus urticae is improved by 3.2 times in combination with the synergistic permeation effect of a siloxane derivative. The mite killing rate of the suspending agent prepared according to a preferable formula reaches 92.5% within 24 hours, and the lasting period is prolonged to 14 days. The system overcomes the defects of slow effectiveness and poor stability of the traditional biopesticide, by means of a targeted combination mechanism of natural components, the environment friendliness is kept while the original pesticide dosage is reduced by 50%, and the system is particularly suitable for the pest control requirement of organic agriculture.

The invention relates to the technical field of electronic packaging materials, in particular to an epoxy resin curing agent masterbatch with latent catalysis and a preparation method of the epoxy resin curing agent masterbatch. The raw materials of the catalyst comprise triphenylphosphine and benzoquinone. By adopting the specific raw materials and the specific preparation process and strictly controlling the raw material adding sequence and the heating temperature, the epoxy resin composition prepared from the masterbatch has a larger processing window and excellent flowability and storage performance.

The invention discloses a layered programmable DNA nano device as well as a preparation method and application thereof. The layered programmable DNA nano device HPDN disclosed by the invention is specially used for space-time selective imaging of mitochondrial miRNA in tumor cells. The layered programmable DNA nano device HPDN is composed of a mitochondrial specific DNA tetrahedron and two cage-shaped HCR hairpin probes, and mitochondrial targeting is achieved through triphenylphosphine (TPP) modification. The HPDN realizes miRNA detection with high sensitivity and specificity by utilizing signal amplification of APE1 activation, ultraviolet light (UV) activation and miR-21 triggering in cells. The technology has the advantages of simplicity and convenience in operation, good biocompatibility, real-time dynamic monitoring and the like, and a new strategy is provided for early diagnosis and treatment monitoring of tumors.

The invention provides a method for recovering rhodium in organic residual liquid containing triphenylphosphine / phosphine oxide, and relates to the technical field of precious metal recovery, and the method comprises the following steps: S1, carrying out reduced pressure rectification on the organic residual liquid containing triphenylphosphine / phosphine oxide to remove volatile components until the indexes of the residual liquid meet the feeding requirements of a subsequent process, and collecting light components for independent storage; s2, adding an acidic medium into the organic phase after light component removal, stirring and heating, introducing an oxidizing agent to carry out oxidation-complexation reaction, maintaining reaction conditions until the reaction is complete, standing for phase splitting, and collecting a water phase containing rhodium complex ions; according to the method, a core process combining oxidation-chlorination transfer and anion exchange adsorption is adopted, and key parameters of each process are accurately controlled, so that the rhodium recovery rate is stabilized at 95% or above, the rhodium content in the residual liquid can be reduced to 5 ppm or below, the industrial emission standard is completely met, and compared with the prior art, the resource recovery efficiency is greatly improved, and the cost is reduced. And waste of precious metal resources is effectively reduced.

The invention discloses a high-temperature-resistant and aging-resistant polyurethane structural adhesive and a preparation method thereof, and belongs to the technical field of structural adhesives. The high-temperature-resistant and aging-resistant polyurethane structural adhesive consists of a component A and a component B, wherein the component A is prepared from the following raw materials in parts by mass: 50 to 90 parts of first polyol, 20 to 40 parts of first filler, 10 to 20 parts of flame retardant, 5 to 15 parts of enhancer, 1 to 3 parts of thixotropic agent, 3 to 5 parts of molecular sieve, 0.1 to 1.0 part of antioxidant, 0.01 to 0.05 part of polyurethane environment-friendly organic bismuth catalyst BCAT-E20 and 0.01 to 0.05 part of triphenylphosphine; the component B is prepared from the following raw materials in parts by mass: 40 to 100 parts of isocyanate prepolymer and 10 to 50 parts of second filler. The invention also provides a preparation method of the composition. Compared with the prior art, the high-temperature-resistant and aging-resistant polyurethane structural adhesive prepared by the invention has the advantages of high impact resistance, high interface bonding strength, good flame retardance, high thermal aging resistance and the like.

The invention discloses a high-strength acrylate rubber material and a preparation method thereof, and relates to the technical field of high polymer materials. When the high-strength acrylate rubber material is prepared, polyhydroxy imidazolium salt and phosphorus pentoxide react to prepare a functional flame retardant; reacting the pre-modified glass fiber with hydrazine hydrate to obtain modified glass fiber; the preparation method comprises the following steps: carrying out solution polymerization on ethyl acrylate, butyl acrylate, acryloxy propyl bis (trimethylsiloxy) methylsilane and glycidyl methacrylate to prepare acrylate raw rubber; the high-strength acrylate rubber material is prepared by uniformly mixing acrylate raw rubber, the modified glass fiber, a functional flame retardant and triphenyl phosphine, plastifying and thin-passing. The high-strength acrylate rubber material prepared by the invention has excellent flame-retardant, antibacterial, anti-aging and mechanical properties.

The invention discloses a tellurium-doped carbon quantum dot and a preparation method and application thereof, the tellurium-doped carbon quantum dot is obtained by using 2, 2 '-diaminodiphenyl telluride as a precursor, the average particle size is 1.9 nm, the thickness is about 2.1 nm, and the surface is rich in amino groups. And fixing (4-carboxybutyl) triphenylphosphonium bromide, 3-morpholinopropionic acid or 3-((4-methylphenyl) sulfonamide) propionic acid on the surfaces of the tellurium-doped carbon quantum dots to prepare Mito-Te-CDs, Lyso-Te-CDs and ER-Te-CDs with an organelle targeting function. The Mito-Te-CDs, the Lyso-Te-CDs and the ER-Te-CDs are good in biocompatibility, can be used as fluorescent probes for targeted imaging of organelles, can be used for recognition and removal of superoxide anions in specific organelles, have a protection effect on cells and can be used for effectively treating acute kidney injury.

The invention provides a synthesis method of an OLED polycyclic fused thiophene compound, and relates to the technical field of material synthesis, and the synthesis method comprises the following steps: providing and mixing 2-naphthalene sulfonic acid and dichloromethane, dropwise adding an N-bromosuccinimide solution into the mixture under the protection of inert gas, and reacting to obtain an intermediate A; dissolving the intermediate A, then adding sodium hydroxide, 4-bromophenylboronic acid, water and tetrakis (triphenylphosphine) palladium, and reacting to obtain an intermediate B; dissolving the intermediate B, adding sulfonic acid and phosphorus pentoxide, and reacting to obtain an intermediate C; adding the intermediate C into tetrahydrofuran, dissolving, adding lithium aluminum hydride under inert gas, and reacting to obtain a target compound. According to the method, the chemical reaction efficiency of the intermediate C is high, and the yield and LC purity of a target product are relatively high.

The present invention provides a method for preparing an oxygen cephalosporin intermediate OZ, the preparation method comprising using a compound shown in formula I as a raw material, triphenylphosphine as a desulfurizing agent, toluene and dichloroethane as solvents for reflux reaction, and preparing an oxygen cephalosporin intermediate OZ shown in formula II. The present invention tests the effects of different organic phosphines on the reaction. According to liquid phase reaction monitoring data, triphenylphosphine is the best. By using a specific precipitation solvent, the crystallization effect is good, and the purity of the product is improved. At the same time, the present invention tests the effects of different organic solvents on the reaction. Among them, a mixed solvent of toluene and dichloroethane is the best for the reaction, and the reaction conversion rate can reach more than 80%. The present invention has a short process route, mild reaction control conditions, simple operation, high yield, low cost, and is suitable for industrial production.

The invention relates to the field of Karstedt catalysts, and discloses a stable-structure Karstedt catalyst for silane modified polyether synthesis, and the stable-structure Karstedt catalyst is prepared from the following raw materials in parts by weight: 2-4 parts of a Karstedt catalyst, 5-8 parts of a polyether siloxane block copolymer, 1-3 parts of nano silicon dioxide, 0.5-1.5 parts of triphenylphosphine, 20-25 parts of propylene glycol monomethyl ether and 0.5-1.0 part of an organosiloxane coupling agent. A polyether siloxane block copolymer is introduced into a Karstedt Catalyst system, and a flexible coating layer is formed outside a catalytic center by utilizing molecular compatibility of a silicon-oxygen chain segment of the polyether siloxane block copolymer and a platinum ligand, so that the exposure degree of the platinum center is remarkably reduced, interference of moisture and polar impurities in air is effectively inhibited, and the catalytic activity of the catalyst is improved. Therefore, the oxidation resistance and the storage stability of the catalyst are improved.

The invention relates to the field of chemical production, and discloses a preparation device and method of bis (triphenylphosphine) palladium dichloride, the preparation device comprises a base, the top of the base is fixedly connected with a preparation cylinder, the front end of the preparation cylinder is fixedly connected with a window, and the top of the preparation cylinder is fixedly connected with a motor; the device comprises a preparation cylinder, the top of the preparation cylinder is fixedly connected with an arc-shaped supporting plate, the inner wall of the preparation cylinder is rotatably connected with a stirring rod, the outer side of the arc-shaped supporting plate is fixedly connected with a quantifying mechanism, the quantifying mechanism comprises a quantifying cylinder, and the outer wall of the quantifying cylinder is fixedly connected with the outer wall of the arc-shaped supporting plate. And the inner wall of the quantifying cylinder is in sliding connection with a partition plate. By arranging the quantifying mechanism, the adding amount of chemical agents can be accurately controlled, and the inner wall space of the three groups of quantifying cylinders is adjusted according to the total manufacturing amount, so that the quantifying effect is achieved, the proportion of the chemical agents is accurately controlled, and the problem that the adding amount is difficult to accurately control in a traditional mode is solved.

The invention discloses a preparation method of a hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked heterogeneous catalyst and an application of the catalyst in catalysis of a cycloaddition reaction of CO2 and epoxide. Trimethoxytriphenylphosphine and dibromo-p-xylene are firstly subjected to quaternary phosphating to form triphenylphosphine-based ionic liquid, and then the triphenylphosphine-based ionic liquid and biphenyl benzyl dichloride can be subjected to aromatic electrophilic substitution reaction in the presence of 1, 2-dichloroethane serving as a solvent and anhydrous aluminum chloride serving as a Lewis acid catalyst to realize cross-linking, so that the triphenylphosphine-based ionic liquid can be prepared. And methoxy can be removed to form hydroxyl, so that the hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked polymer is prepared in one step. The resulting heterogeneous catalyst effectively converts CO2 to cyclic carbonates under milder conditions (80 DEG C, 1 atm) in the absence of a soluble co-catalyst.

The present invention relates to the technical field of chemical synthesis, and in particular to a method for preparing a symmetrical double-terminal piperidinyl alkane, wherein the preparation method comprises the following steps: under the protection of an inert gas, a double-terminal halogenated alkane reacts with triphenylphosphine to prepare a phosphonium salt, namely an intermediate A, and then the intermediate A reacts with a piperidinone derivative under alkaline conditions to produce an intermediate B by Wittig reaction; the intermediate B is subjected to hydrogenation reduction to obtain the symmetrical double-terminal piperidinyl alkane; the raw materials of the preparation method of the present invention are easily available, the yield is high, and the preparation method is conducive to industrial production. The purity of the symmetrical double-terminal piperidinyl alkane obtained by the preparation method of the present invention is greater than 99%, and the total yield is 75-80%; the yield and purity are relatively high.

The invention discloses a high-corrosion-resistance electrophoretic coating and a preparation method thereof, and belongs to the technical field of electrophoretic coatings. The preparation method of the coating comprises the following steps: S1, mixing epoxy resin, a thioether compound with an active group at the end position, a chain extender, triphenylphosphine, an organic solvent 2, an amino catalyst and a neutralizer, and carrying out heat preservation and chain extension to obtain thioether modified epoxy resin; s2, aminating, neutralizing and re-emulsifying the thioether modified epoxy resin in the step S1, an aminating agent, an organic solvent 1, a curing agent, a neutralizing agent and deionized water to obtain a high-corrosion-resistance emulsion; s3, mixing and grinding the thioether modified epoxy resin in the step S1 with pigment, a dispersing agent and deionized water to obtain high-corrosion-resistance color paste; s4, mixing the high-corrosion-resistance emulsion in S2 and the high-corrosion-resistance color paste in S3 according to the mass ratio of 4: 1 to 8: 1 to obtain the high-corrosion-resistance electrophoretic coating. And by adopting the thioether modified epoxy resin, the obtained coating has excellent corrosion resistance, mechanical property and flame retardant property at the same time.

The application discloses an organic compound biological probe and a preparation method and application thereof, and belongs to the field of fluorescent probes. The structural formula of the organic compound biological probe is as follows, and the preparation method comprises the following steps: adding 2,4-dihydroxybenzaldehyde and anhydrous potassium carbonate into anhydrous acetonitrile or DMF, then dropwise adding 1,4-dibromobutane to obtain a colorless oily compound 1 through reflux reaction; dissolving the compound 1 and triphenylphosphine in anhydrous acetonitrile to obtain a solid compound 2 through reflux reaction; dissolving 1,1,2-trimethyl-1H-benzo[e]indole and iodoethane in anhydrous acetonitrile to obtain a compound 3 through reflux; dissolving the compound 3 and the compound 2 in anhydrous ethanol, adding piperidine, and then performing reflux reaction and purification to obtain the organic compound biological probe. The organic compound biological probe can self-assemble into nanoparticles with a size of about 1.6 nm in water, has strong anti-photobleaching ability, and integrates red light and near-infrared dual-channel imaging, pH detection, mitochondrion targeting and chemotherapy.