29 results about "Lewis acid catalysis" patented technology

A low-modulus, high-resilience modified alcohol-based silicone sealant, its preparation method, and its application are disclosed, relating to the field of sealant materials technology. The silicone sealant comprises the following components in parts by weight: 100 parts of α,ω-alkoxysilane ethylidene-terminated polydimethylsiloxane, 30-80 parts of plasticizer, 80-150 parts of reinforcing filler, 0.5-20 parts of silane crosslinking agent, 0.5-10 parts of silane tackifier, and 0.01-1 part of Lewis acid catalyst; wherein the plasticizer is α-alkoxysilane ethylidene-terminated polydimethylsiloxane. The low-modulus, high-resilience silicone sealant of this invention exhibits fast surface drying speed, low modulus, high elastic recovery rate, good adhesion, and weather resistance.

This invention relates to an electrolyte for lithium-ion batteries or lithium metal batteries, a method for preparing the electrolyte, and a lithium battery. The electrolyte comprises a lithium salt, an organic solvent, and functional additives, wherein the functional additives include aluminum alkoxide compounds. A battery containing the additives is also provided. Based on the discovery that ethylene carbonate (EC) degrades battery thermal safety under high-temperature thermal abuse conditions, aluminum isopropoxide is innovatively introduced as a functional additive. This additive is stable at room temperature, but under high-temperature thermal abuse scenarios, it can act as a Lewis acid catalyst, specifically catalyzing the ring-opening polymerization reaction of EC in the electrolyte to generate polymer segments. Compared with existing technologies, the electrolyte provided by this invention effectively improves the high-temperature storage performance and thermal shock resistance of the battery without sacrificing its room-temperature electrochemical performance.

The application discloses a method for synthesizing an alpha-position chiral nitrogen heteroaromatic ring under the synergistic catalysis of a chiral phosphoric acid and a Lewis acid, and the method comprises the following steps: taking a nitrogen heteroaromatic ring olefin I as an electrophilic reagent, taking an aryl alkyl boronic acid II as a carbon nucleophile, and under the synergistic catalysis of a Lewis acid catalyst and a chiral phosphoric acid catalyst, in the presence of an organic solvent, an additive and a proton source, performing a conjugate addition-asymmetric protonation reaction to generate an alpha-position chiral nitrogen heteroaromatic compound shown in formula V, and the reaction is shown as follows: The application provides a conjugate addition-asymmetric protonation strategy for a nitrogen heteroaromatic ring olefin, which is synergistically catalyzed by a chiral phosphoric acid and a Lewis acid (Fe(OTs)3) and involves an organic boron reagent, a series of alpha-position chiral nitrogen heteroaromatic compounds are successfully synthesized by using the catalytic system, the highest enantioselectivity reaches 98% ee, and good universality is shown for aryl, heterocyclic and polysubstituted substrates, and the bottleneck problem of low reactivity of 1,1-disubstituted substrates in a traditional method is effectively overcome.

The application provides a high-toughness methyl silicone resin and a preparation method thereof. The high-toughness methyl silicone resin comprises the following raw materials in parts by mass: 100 parts of methyltrimethoxysilane; 18-24 parts of dimethyldimethoxysilane; 10-12 parts of a polyhydroxy steric-modified agent; 20-26 parts of water; 36-44 parts of an organic solvent; 0.1-0.3 parts of a titanate catalyst; and 0.1-0.3 parts of an organic tin catalyst. The polyhydroxy steric-modified agent is a topological structure compound containing at least two active hydroxyl groups, which is prepared by an addition reaction of a multifunctional aliphatic polyol and an unsaturated bridged cyclic alicyclic compound under the catalysis of a Lewis acid, and the active hydroxyl group content of the topological structure compound is 3.5-4 mmol / g. The high-toughness methyl silicone resin is applied in the preparation of a flexible sealing material or a heat-resistant coating material for a heating pipe.

This invention discloses a biphasic combined Lewis acid hydrolysis method for extracting diosgenin from fenugreek, belonging to the field of natural product extraction technology. The extraction method disclosed in this invention includes: defatting fenugreek raw material, mixing it with a biphasic reaction system composed of Lewis acid, concentrated hydrochloric acid, methanol, water, and petroleum ether, and carrying out a hydrolysis reaction under heating conditions. After the reaction, the organic phase is separated, concentrated, and dried to obtain diosgenin. This invention innovatively introduces a Lewis acid catalyst into the biphasic acid hydrolysis system of fenugreek, achieving significant results such as a 25% reduction in reaction time, a 50% reduction in concentrated hydrochloric acid usage, and a 25% reduction in water usage while ensuring the extraction rate of diosgenin. This method has advantages such as mild conditions, low acid consumption, short processing time, and environmental friendliness, and is suitable for the large-scale green production of diosgenin.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

This invention relates to the field of nanomedicine formulation technology, and discloses a ROS-responsive astaxanthin nanoparticle, its preparation method, and its application. The preparation method includes: catalyzing the transketalization reaction of 3-mercaptopropionic acid with 2,2-dimethoxypropane using an alcohol-water tolerant Lewis acid catalyst (preferably scandium trifluoromethanesulfonate) to prepare a thioketal monomer containing dual-terminated carboxyl groups; coupling the thioketal monomer with stearyl alcohol and methoxy polyethylene glycol using a stepwise sequential coupling strategy to construct an amphiphilic polymer with thioketal bonds as ROS-responsive connecting units; co-dissolving the polymer, astaxanthin, and tocotrienols in tetrahydrofuran, and preparing the nanoparticles using a multi-inlet micro-collision flow nanoprecipitation process. The resulting nanoparticles have a particle size of 100 nm to 200 nm, an astaxanthin encapsulation rate of 90% to 99%, and achieve targeted release in response to reactive oxygen species in the pathological microenvironment. Astaxanthin and tocotrienols synergistically exert antioxidant effects.

The application discloses a modified mixed solution suitable for cement construction waste material regeneration, a cement construction waste material regeneration product and a preparation method thereof, and belongs to the technical field of solid waste utilization. The modified mixed solution for regeneration in the application comprises the following components in parts by weight: 5-8 parts of dodecanedioic acid solution and 15-20 parts of Lewis acid catalyst solution. Through the synergistic effect of "chemical grafting modification-catalytic strengthening bonding-physical compaction forming", the regenerated product with high compactness and excellent compressive strength can be prepared without additional traditional cementing materials such as cement and lime.

This invention provides a method for synthesizing 4-methoxypyrrole derivatives, relating to the field of organic chemical intermediate synthesis technology. The 4-methoxypyrrole derivative is prepared by first reacting m-difluorobenzene as a starting material with oxaloyl chloride monoester under Lewis acid catalysis. The reaction product then undergoes cyclization with aminopropionitrile under alkaline conditions. The subsequent product reacts with methanol in a boron trifluoride complex, followed by methylation with a methylating agent under alkaline conditions. This invention overcomes the shortcomings of existing technologies, providing a simple, low-cost, and easily industrialized method for preparing 4-methoxypyrrole derivatives. It offers advantages such as readily available raw materials, high yield, good quality, simple operation, and suitability for industrial production.

This invention discloses a method for preparing imidazolidinone derivatives, belonging to the field of pharmaceutical synthesis technology. The method involves reacting isocyanate and polysubstituted propargylamine as raw materials in an organic solvent under rare-earth Lewis acid catalysis to obtain the target imidazolidinone derivative. This invention features a mild reaction, simple operation, improved atom economy and synthetic efficiency, and good functional group compatibility.

The application discloses a high-stability water-reducing agent and a preparation method thereof. The water-reducing agent comprises the following raw materials in parts by weight: 100-150 parts of an amino silane oligomer, 80-120 parts of an epoxy-terminated allyl polyether, 0.5-3 parts of a Lewis acid catalyst, and 5-10 parts of a sodium hydroxide solution. The water-reducing agent comprises a main chain and polyethylene glycol side chains, the main chain further comprises a silicon-oxygen structure (Si-O-Si) and Si-OH active groups, and thus the chemical stability of concrete can be improved and the water consumption of the concrete can be reduced.

This invention discloses an interpenetrating polymer network (IPN) material for the efficient purification of volatile organic compounds (VOCs) and its preparation method. The method first employs a B-H (-NO2) coupling method, using tris(4-nitrophenyl)amine or p-dinitrobenzene as the core component, and various aromatic amine linkers to construct a primary conjugated microporous polymer network (N-CMPs) under a palladium catalysis system. Subsequently, through post-molecular weaving and expansion technology, secondary crosslinking is carried out using p-phenylenedichlorobenzyl or acyl chloride external crosslinking agents under Lewis acid catalysis, significantly improving the density and specific surface area of ​​the framework. The prepared HCCP1-X series materials exhibit a saturated adsorption capacity of 961 mg / g for toluene and 895 mg / g for ethyl acetate at 25 °C, providing a new pathway for the development of highly efficient VOCs adsorbents.

The application discloses a synthesis method of 9-bromoanthracene and belongs to the technical field of organic synthesis. Anthracene is used as raw material, inorganic bromide salt is used as a bromine source, hydrogen peroxide is used as an oxidant, and 9-bromoanthracene is synthesized in a mixed solvent under the catalysis of a composite Lewis acid with high selectivity; the crude product is purified through step-by-step fractional recrystallization to obtain a high-purity product. Through the synergistic effect of the composite catalytic system and the mixed solvent, the generation of the difficult-to-remove by-product 9,10-dibromoanthracene is inhibited from the source, and the efficient separation of the product and the key impurities can be realized without column chromatography by combining the gradient cooling fractional crystallization process. The process is green and safe, simple to operate, low in cost and easy to industrialize, and the prepared 9-bromoanthracene can meet the application requirements in high-end fields such as OLED photoelectric materials.

This invention relates to the field of organic chemical synthesis technology, specifically to a method for synthesizing oxime ester-type photoacid-producing compounds. The method includes: etherifying phenol with 1,3-dihalopropane in an alkaline environment and an organic solvent, followed by post-treatment to obtain 1,3-diphenoxypropane; then, in an organic solvent, reacting it with a trifluoroacetylation reagent under Lewis acid catalysis to undergo a Friedel-Crafts acylation reaction, followed by quenching and post-treatment to obtain a bis(trifluoroacetyl) product; oximating the bis(trifluoroacetyl) product with an oximeation reagent in an organic solvent, followed by post-treatment to obtain a bis(oxime) product; and then subjecting the obtained bis(oxime) product to a sulfonation reaction with a propylsulfonation reagent in an alkaline environment and an organic solvent, followed by washing with water, distillation, and recrystallization purification to obtain the target oxime ester-type photoacid-producing compound. This method solves the problems of complex processes, difficult purification, limited raw materials, high costs, and difficulty in meeting the needs of industrial production in traditional oxime ester-type photoacid-producing agent synthesis methods.

The invention provides a composite catalyst and a method for chemical recovery of a polymethacrylate polymer, and belongs to the technical field of high polymer materials. The composite catalyst for chemical recovery of the polymethacrylate polymer comprises a trivalent iron salt, a quaternary ammonium salt chelating agent and a triphenylphosphino conjugated super-crosslinked polymer with a layered porous structure, the triphenylphosphino conjugated super-crosslinked polymer is prepared from triphenylphosphine and an aromatic monomer through a Friedel-Crafts alkylation reaction under the catalytic action of a Lewis acid catalyst.

The application provides a preparation method of 1-bromoethyl acetate and belongs to the technical field of organic synthesis. In the application, ethylene acetate and sodium bromide are used as raw materials, and the reaction is carried out at a certain temperature in the presence of an oxidant and a catalyst. After the reaction is completed, the 1-bromoethyl acetate is obtained through post-treatment. In the application, sodium bromide is used as a bromine source, which is widely available and low in price. Meanwhile, the use of corrosive Lewis acid catalyst is avoided, which meets the development direction of green chemistry. The reaction of the application can be smoothly carried out at normal temperature and pressure, and is suitable for industrial amplification production. The application provides a preparation method of 1-bromoethyl acetate, which is simple in operation, mild in reaction condition, good in selectivity, high in yield, low in three wastes and low in cost.

This invention discloses a high-quality electronic fluorinated liquid and its preparation method, relating to the field of fine chemicals. The method includes: selecting a branched perfluoro-2-methyl-3-oxahexane precursor; conducting a fluorine-free liquid-phase catalytic fluorination reaction with hydrogen fluoride under the action of a supported Lewis acid catalyst; sequentially purifying the liquid through a multi-stage gradient process involving molecular sieve adsorption for water removal, chelating resin for metal ion removal, and ultrafiltration membrane for particulate matter removal; further purifying the liquid by high-vacuum distillation to obtain a narrow-boiling-range fraction; and implementing closed-loop feedback control using an online moisture, metal ion, and particulate matter monitoring system. This invention aims to solve the problems of insufficient purity, poor process safety, and unsatisfactory thermophysical properties in existing electronic fluorinated liquids. The resulting product has extremely low moisture, metal ion, and particulate matter content, and possesses high dielectric strength, high thermal conductivity, and excellent long-term stability. Furthermore, the process is safe, environmentally friendly, and yields high amounts, making it suitable for high-end electronic fields such as semiconductor immersion cooling.

In a process for the production of 1,1,1,2,3-pentachloropropane, optionally in the presence of carbon tetrachloride, by introducing 1,1,1,3-tetrachloropropane, chlorine and a Lewis acid catalyst, the improvement comprising: introducing the Lewis acid as a slurry in a chlorinated hydrocarbon.

This invention discloses a method for the high-value utilization of kitchen waste and waste plastics, belonging to the field of solid waste resource utilization and environmental protection technology. This invention utilizes the synergistic conversion characteristics of kitchen waste and waste plastics, achieving high-value utilization of mixed solid waste through a co-hydrothermal carbonization process. By introducing anhydrous ethanol to pre-wet and disperse the surface of the waste plastics before co-hydrothermal carbonization, the problem of traditional plastics being unable to directly participate in hydrothermal reactions is avoided, reducing complex sorting and energy-intensive pretreatment steps. This invention also introduces iron salts as Lewis acid catalysts and structure inducers during the hydrothermal carbonization process, promoting the dehydration, condensation, and aromatization reactions of biomass components through in-situ catalysis. Combined with subsequent pyrolysis and acid washing, iron-based substances are effectively removed, thereby releasing and constructing a rich pore structure, ultimately obtaining a porous carbon material with high specific surface area and good porosity.

This invention belongs to the field of anti-inflammatory compound synthesis technology, specifically relating to a guaiazoline triarylmethane, its synthesis method, and its application in the preparation of antibacterial products. The structure of the guaiazoline triarylmethane is shown in formula (Ⅰ). This invention synthesizes guaiazoline triarylmethane by using readily available guaiazoline and p-methylenebenzoquinone as starting materials, and by a 1,6-conjugated addition reaction under Lewis acid catalysis. This method is simple to operate, has mild reaction conditions, uses economical and readily available reagents and raw materials, has a high yield of the target product, and has a wide range of substrate applicability; it has good prospects and potential for industrial application.

The present application relates to the field of catalysts, in particular to a kind of high-efficiency propylene trimerization multi-active center catalyst and its preparation method.The propylene trimerization multi-active center catalyst is composed of porous carrier and Lewis acid, wherein the Lewis acid is any two or more combinations in AlCl3, CuCl2, ZnCl2.The present application combines different kinds of Lewis acid with porous carrier together, and the multi-active center catalyst suitable for propylene trimerization is prepared by impregnation method.The results show that compared with single Lewis acid catalyst, the propylene conversion rate and the selectivity of trimerization product 1-nonene of the obtained catalyst are improved.The method has simple process flow, low raw material price and has the potential for large-scale preparation.

This application provides an indole ketone ester compound, its preparation method, and its application in herbicides. The preparation method uses a substituted α,β-unsaturated ketone ester as a single raw material, and obtains it through a one-step tandem cyclization reaction in anhydrous ethanol under Lewis acid catalysis. These compounds exhibit excellent growth-inhibiting activity against barnyard grass and other gramineous weeds; most compounds show inhibition rates exceeding 70% at a concentration of 50 mg / L. They are also safe for wheat, corn, rapeseed, and bok choy, and can be used to prepare herbicides. The compounds of this invention have novel structures, good stability, and a simple, mild, and environmentally friendly preparation process. Furthermore, the constructed framework contains multiple functional groups, which facilitates the subsequent synthesis and application of this framework.

This disclosure relates to a method for preparing coal-based mPAO and the resulting coal-based mPAO product. The method includes: (1) subjecting coal-based Fischer-Tropsch synthesis oil containing C5-C14 fractions to single-carbon cutting and deoxidation treatment to obtain a single-carbon alkene mixture; (2) subjecting the single-carbon alkene mixture to a polymerization reaction in an inert atmosphere in the presence of a composite catalyst; the composite catalyst includes a Lewis acid catalyst, a metallocene catalyst, and a co-catalyst; the single-carbon alkene mixture contains α-olefins, as well as inner olefins and / or alkanes. The method of this disclosure avoids complex raw material purification steps, simplifies raw material processing steps, reduces raw material processing costs, improves product yield, and enables the acquisition of high-performance products.

The method for synthesizing a benz [c, g] carbazole compound through gold-light synergistic catalysis belongs to the technical field of organic gold catalysis and photocatalysis, and comprises the following steps: gold catalyst and Lewis acid catalyst are added into a mixed toluene solution of a nitrogen methyl pyrrole and a diphenylacetylene compound; the obtained reaction liquid is reacted at 60 DEG C for 10 hours; after the reaction is completed, the obtained product is separated and purified, dissolved in cyclohexane, and I2 is added into the obtained solution under the irradiation of an ultraviolet lamp; the obtained solution is stirred at room temperature for 6 hours; after the reaction is completed, the benz [c, g] carbazole compound is separated and purified. The synthesis and characterization of a bis-benz [c, g] carbazole compound and a bis-olefin precursor are realized for the first time, the reaction condition is simple, the adaptability of the substrate is relatively wide, and the method is a very excellent synthesis strategy.

The application discloses an anti-corrosion polyvinyl chloride insulated cable for aluminum alloy conductors and a production method thereof, and belongs to the technical field of fireproof cables. A flame-retardant encapsulated hollow carbon fiber ternary synergistic flame-retardant system is formed by a cobalt metal framework, ammonium polyphosphate and hollow carbon fibers. The cobalt metal framework is a high-efficiency Lewis acid catalyst, which can quickly catalyze ammonium polyphosphate to form a continuous and high-temperature-resistant composite carbon layer at high temperatures, thereby avoiding acid-base neutralization. The flame-retardant encapsulated hollow carbon fiber has the cobalt metal framework encapsulated in the hollow carbon fiber and the surface coated with ammonium polyphosphate. The special structure can make the hollow carbon fiber simultaneously serve as a physical barrier and a carrier, encapsulate the cobalt metal framework in the cavity, always maintain the catalytic activity of cobalt ions, fix the ammonium polyphosphate on the surface of the hollow carbon fiber by chemical bonds as the carrier, prevent the ammonium polyphosphate from being easily precipitated and migrated, and avoid the problems that the ammonium polyphosphate as a filler is easy to absorb moisture, easy to hydrolyze and poor in compatibility with a matrix.

The application belongs to the technical field of medicine synthesis, and particularly relates to a novel and efficient furosemide-D5 synthesis method. The furosemide-D5 molecule is efficiently synthesized in a short linear step from simple raw materials such as trans-2,3-dibromo-2-butene-1,4-diol and the like through an oxidation cyclization, a low-temperature metallization-carboxylation, a Lewis acid catalysis bromination, a catalytic deuterium decomposition and a LiAlD4 reduction and the like. In the application, the synthesis reaction raw materials are easy to obtain, the operation is simple and safe, waste is less, the isotopic raw material utilization rate is high, and the precise site substitution reaction of deuterium atoms is realized.

The application relates to the field of batteries, and discloses a solid-state electrolyte precursor and application thereof, a sodium metal battery and a preparation method thereof. The solid-state electrolyte precursor comprises an ester solvent, an acrylic ester monomer, a crosslinking agent, a silane initiator, a Lewis acid catalyst and a sodium salt; the mass ratio of the acrylic ester monomer to the silane initiator is 1:0.00001-0.05. The acrylic ester polymer obtained by using the silane initiator to initiate monomer polymerization has a narrower molecular weight distribution, and the silane initiator does not deteriorate the battery; and the sodium metal battery prepared by using the solid-state electrolyte precursor has high cycle life and safety.

This invention belongs to the field of solid waste resource utilization technology, specifically relating to a method for preparing epoxy resin adhesives from waste wind turbine blades through controlled depolymerization. This method employs a Lewis acid catalytic system to selectively depolymerize the cross-linked epoxy resin in the wind turbine blades into oligomers under mild conditions, rather than completely degrading it into monomers. By precisely controlling the type, ratio, and reaction conditions of the catalyst, the depolymerization efficiency of the epoxy resin is significantly improved, and the molecular weight of the resulting oligomeric epoxy resin can be effectively controlled, providing a structurally controllable raw material basis for the subsequent preparation of the adhesive. Using the recovered low-molecular-weight epoxy resin as a matrix, it is scientifically compounded with a curing agent, nonionic surfactant, and plasticizer to successfully prepare an epoxy resin adhesive with excellent comprehensive performance.