197 results about "Para-Benzoquinone" patented technology

The invention relates to a 1,3,5,7-tetramethyl-8-triphenylamine base pyrrole methane-boron difluoride complex compound and a preparation method thereof, which belong to the technical field of organic synthesis. The existing photocatalysts have few varieties and low conversion rate, and the existing bodipy dye has low infrared fluorescent efficiency and small Stokes displacement. The invention provides the 1,3,5,7-tetramethyl-8-triphenylamine base pyrrole methane-boron difluoride complex compound. The preparation method comprises the steps that: 4-formoxyl tetramethyl and 2,4-dimethyl pyrrole are dissolved in organic solvents, trifluoroacetic acid or monoprop is used as catalysts, and a reaction system is formed; 2,3-dichloro-5,6-dicyan-1,4-para-benzoquinone with the same mol ratio as the 4-formoxyl tetramethyl is taken, is dissolved in the methylene dichloride and is added into the reaction system; and one of triethylamine, triisopropyl amine and N,N-diisopropylethylamine is added into the reaction system, boron trifluoride etherate is added under the ice bath, and final products are generated.

The preparation process of functional polyolefin resin includes electronic beam or gamma-ray pre-irradiation treatment of functional polyolefin resin; mechanical mixing of polyolefin resin after pre-treatment, functional monomer and electron donor reagent; and reacting extrusion for the polyolefin resin in molten state and functional monomer to produce grafting reaction. The polyolefin resin includes polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-styrene copolymer, polystyrene, etc; the functional monomer is unsaturated organic acid or its derivative with amino group, isocyanate, hydroxyl group or other reactive functional group; and the electron donor reagent includes electron-rich compound with P, N, S or O element, p-benzoquinone, triphenyl phosphite, triphenyl phosphate, etc.

The invention discloses a method for utilizing a molecularly imprinted electrochemical sensor to detect trace gibberellin A3. The method comprises the following steps of: o-phenylenediamine is taken as a function monomer, and gibberellin is adopted as a moldboard molecule to obtain a gibberellin A3 molecularly imprinted film through polymerization of mitallic electrode surface electricity; in the hydrogen peroxide-hydroquinone bottom solution with the pH of 7.4, the polyamide-amine arborization macromolecule complexed with a ferric ion can carry out catalyzing degradation on the hydrogen peroxide under energization; and the gibberellin A3 in the sample is utilized to replace functionalized arborization macromolecule gibberellin A3, so that the reduction strength of p-benzoquinone to hydroquinone is increased, and a method for detecting the gibberellin A3 is established. When the gibberellin A3 is in concentration range of 3*10-7mol / L-6*10-9mol / L, the lifting degree of an electrochemistry signal and the concentration of the gibberellin A3 is of a good linear relationship, and the method detection limit is 2.0*10-9 mol / L. The method provided by the invention improves the detective sensitivity and selectivity, and the detection of the light concentration gibberellin A3 is easy to be automated.

A conductive adhesive sealant comprising vinyl ester resin or polyester resin, graphite powder, peroxide free-radical initiator, milled carbon fiber, and a quinone-based inhibitor such as para benzoquinone.

The invention relates to a method for preparing 7-(4-(4-(benzo[b]thienyl)-1-piperazinyl) butoxy)-2(1H)-quinolinone, and belongs to the technical field of preparation of quinolinone derivatives. The method comprises the following steps: reacting 7-hydroxy-3,4-dihydro-2(1H)-quinolinone serving as an initial raw material with 1,4-dibromobutane to generate a compound III; reacting the compound III with 4-(1-piperazinyl) benzo[b]thienyl or hydrochloride thereof in an alkaline environment to generate a compound V; reacting the compound V with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in a solvent, extracting and drying the reacting product to prepare a crude product of a target product, and recrystallizing the crude product to obtain a competitive product 7-(4-(4-(benzo[b]thienyl)-1-piperazinyl) butoxy)-2(1H)-quinolinone. The method has the advantages of easily available raw materials, simple process, economy and environment friendliness, and is suitable for industrial production.

The invention discloses a DOPO-containing dioxacaprophosphate flame retardant. The flame retardant is prepared by the following steps: reacting DOPO and p-benzoquinone in an organic solvent so as to obtain an intermediate I; preparing an intermediate II from neopentyl glycol and phosphorus oxychloride under the action of chloroform; and reacting the intermediate I and the intermediate II in an organic solvent, thereby obtaining the flame retardant. The flame retardant is white in appearance, high in thermal stability and high in flame retardant rate and has the purity of 99.5 percent. The flame retardant can serve as a reactive flame retardant to be used in an epoxy resin, an ABS resin, polyurethane and other thermosetting resins, also can serve as an additive flame retardant, is used for meeting the halogen-free flame retardant requirements on ABS, nylon and other engineering plastics with high heat resistance requirements on the flame retardant and is wide in application prospects.

The invention relates to a hydroquinone preparation method, in particular to a method for producing hydroquinone by means of catalytic hydrogenation and reduction of benzoquinone. The method includes: adding hydrogenation aqueous suspension into a closed reaction kettle, feeding inert gas into the reaction kettle to replace the air out of the reaction kettle, adding palladium carbon catalyst into the reaction kettle, controlling hydrogen pressure in the reaction kettle and the reaction temperature while stirring the reaction liquid, and obtaining the hydroquinone with the purity equal to or higher than 99.0% after reaction. The hydroquinone preparation method is simple in operation, low in reaction condition, low in raw material loss and applicable to industrial production.

A method is described for determining CoQ10 concentrations in plasma samples. CoQ10 in the plasma sample is oxidized by treating the sample with an oxidizing agent having a redox potential higher than the redox potential of CoQ10, such as, for example, para-benzoquinone. Following oxidation of the CoQ10, the CoQ10 in the plasma sample is extracted with an alcohol, such as, for example, 1-propanol. The alcohol extract is analyzed using direct injection into the HPLC apparatus. This method achieves a rapid, accurate analysis of plasma CoQ10 levels, which can be used for monitoring the bioavailability of orally administered CoQ10 used as a food supplement or as an adjunctive therapy.

The invention discloses a preparation method of an efficient vanadium molybdenum bismuth photoanode with a reducing-state surface. The preparation method comprises the following steps: (S1) preparation of raw materials and equipment: Bi(NO3)3.5H2O, KI solution, dilute HNO3, p-benzoquinone, anhydrous ethanol, acetylacetone vanadium, dimethyl sulfoxide, acetylacetone molybdenum solution, a muffle and NaOH solution are prepared; (S2) 1-3 mmol of Bi(NO3)3.5H2O in the step (S1) is taken into 50 mL of KI solution with a concentration of 1-3 mol / L for mixing; and after dissolution, the dilute HNO3 isadded in the obtained solution to adjust PH to reach acidity; and (S3) 8-10 mmol of p-benzoquinone in the step (S1) is taken into 20 mL of anhydrous ethanol for ultrasonic dissolution; and the obtained solution is mixed with the solution prepared in the step (S2) uniformly. The preparation method greatly improves the performance of photoelectric chemical pyrolysis water of a BiMoVO photoanode generating hydrogen, and reduces the cost.

Process for the preparation of 2,3,5-trimethyl-p-benzoquinone by oxidizing 2,3,5-trimethylphenol or 2,3,6-trimethylphenol with oxygen or an oxygen-containing gas mixture in the presence of a catalyst system which can be a copper halide and a transition metal halide; for example iron, chromium, manganese, cobalt, nickel, zinc or a rare earth halide, in a two-phase reaction medium, at elevated temperature.

The invention discloses a urease inhibitor determination method based on a fluorescence gold nano cluster. The urease inhibitor determination method is characterized in that urea is catalyzed to generate ammonium and carbon dioxide by utilizing the specificity of urease, the pH value of the system can be increased through the newly generated ammonium, the fluorescence of the gold nano cluster protected by N-acetyl-L-cysteine is extinguished, the urease inhibitor can prevent the process that the urea is decomposed by the catalyzing of the urease, the extinguishment of the fluorescence is inhibited, and the urease inhibitor determination method can be used for detecting the urease inhibitor. An F650 value is determined, the inhabitation rate is calculated, and the contents of IC50 of cysteamine and p-benzoquinone, respectively 2.8mu mol / L and 11.9mu mol / L, can be obtained through the fitting by software. The urease inhibitor determination method can be used for the high-throughput screening of the urease inhibitor.

The invention relates to a preparation method of a bi-component coating unsaturated polyester resin. The preparation method comprises the following steps of putting reactants and a first polymerization inhibitor accounting for 250 ppm-320 ppm of a total mass of the resin into a container to carry out polycondensation and dehydration reaction, wherein the reactants comprise a dihydric alcohol, allyl ether and unsaturated dicarboxylic acid or anhydride; cooling to a temperature of 120 DEG C-140 DEG C; adding the first polymerization inhibitor accounting for 40 ppm-80 ppm of the total mass of the resin; diluting by adding styrene; cooling to the temperature of 40-60 DEG C; and adding a second polymerization inhibitor accounting for 40 ppm-80 ppm of the total mass of the resin, wherein the second polymerization inhibitor is one or two of 1,4-naphthoquinone and p-benzoquinone. The bi-component coating unsaturated polyester resin prepared by the preparation method has a long resin activation period after an initiator is added; a drying time after the resin added with an accelerant and a resin added with the initiator are mixed is relatively short; and film-forming quality is high.

The invention relates to a high-temperature resistant anaerobic locking glue and a preparation method of the high-temperature resistant anaerobic locking glue. The anaerobic locking glue comprises 45 parts of (2) ethoxylated bisphenol A dimethacrylate, 20 parts of hydroxypropyl methacrylate, 15 parts of boric acid, 12.39 parts of bisphenol A fumaric acid polyester, 3 parts of fumed silica, 0.8 part of benzoic hydrazine, 0.6 part of o-benzene sulfonyl imine, 1.0 part of ethylenediamine tetraacetic acid disodium salt, 2.0 parts of cumene hydroperoxide, 0.2 part of fast red, and 0.01 part of para-benzoquinone. The anaerobic locking glue can be used for a short time at the temperature blow 230 DEG C and a long time at the temperature above 200 DEG C. The thermal aging resistance of the anaerobic locking glue at 230 DEG C is improved significantly. The anaerobic locking glue has a wide range of application and overcomes the defects that the existing ordinary anaerobic glue can not adapt to the high-temperature working condition.

This invention relates to a kind of nonmetal reinforcement, it is composed of high strength gauze, the felt layer and the plastic layer. The high strength gauze and the felt layer are in the plastic layer, the high strength gauze is between the felt layer, the cross section of the reinforcement is circle or ellipse, the thickness of the plastic layer is 0.2mm-120mm, the high strength gauze is the line or net has at least one section of fiber glass, aryl gauze, PBO (Poly-para-benzoquinone benzodiazole) or at least one fiber glass, aryl gauze, PBO (Poly-para-benzoquinone benzodiazole). This invention can reach the high stretch-proof request to the nonmetal optical fiber cable in exist technology in the situation that not increase even reduce the size of exist optical fiber cable, so it can save the cost of optical fiber cable, save the space, solves the idea that people want to solve but never gain success.

The invention discloses a preparation method of 2-(chloromethyl)-5,6-dimethoxy-3-methyl-1,4-para benzoquinone, wherein the 2-(chloromethyl)-5,6-dimethoxy-3-methyl-1,4-para benzoquinone is the key intermediate for preparation of coenzyme Q compounds. The preparation method comprises the steps of using 3,4,5-trimethoxytoluene as raw material, and carrying out four steps of Vilsmeier-Haack reaction, Blanc chloromethylation reaction, Dakin reaction and oxidation reaction to obtain 2-(chloromethyl)-5,6-dimethoxy-3-methyl-1,4-para benzoquinone with high purity. The overall yield is up to more than 50%. The method provided by the invention has the advantages of rich source of raw material, high yield, good quality and purity of the product, simple process, low cost and wide application prospect.

The invention discloses an application of various compounds such as polyphenols in resisting coronavirus. The invention relates to the application of one or more of a polyphenol substance, a proton pump inhibitor, p-benzoquinone and a derivative thereof, an active ingredient of sappan wood, TDZD-8, thiomersalate, alkannin, Tidelusib, protoflavin, rabeprazole sodium, PX-12, Dixanthophygen, methyl cholate, carbamofluorine, corilagin, dihydromyricetin, chloramine T, merbromin, gallocatechin, fraxetin, meisoindigo, a lactic acid ethacridine monohydrate and sousoprazole in preparation of drugs for treating and / or preventing diseases caused by coronavirus. In-vitro enzyme activity experiments show that various compounds such as 1, 4-naphthoquinone and the like can well inhibit the activity of main protease in the coronavirus, and the defect that diseases caused by the coronavirus cannot be treated in the prior art is overcome.

The invention discloses a carboxylic ester structure containing diene monomer and polyester thereof, and sulfur-containing polyester. The monomer is prepared through the following steps: 1) with one selected from the group consisting of vanillin, syringaldehyde, p-hydroxybenzaldehyde, 3-fluoro-4-hydroxybenzaldehyde, 3-bromo-4-hydroxybenzaldehyde and 3-methyl-4-hydroxybenzaldehyde as a raw material, dissolving the raw material into an organic solvent, then allowing an obtained solution to react with alkenyl halide under the action of a catalyst, and allowing a reaction product to be recrystallized or separated through a chromatography column so as to obtain an olefine aldehyde monomer; and 2) with the olefine aldehyde monomer as a raw material, allowing the olefine aldehyde monomer to reactunder the action of a catalyst and a promoter without a solvent or after the olefine aldehyde monomer is dissolved in an organic solvent, and allowing a reaction product to be recrystallized or separated through a chromatography column so as to obtain the carboxylic ester structure containing diene monomer. The polyester provided by the invention is prepared under the action of a Hoveyda-Grubbs catalyst and p-benzoquinone. The sulfur-containing polyester provided by the invention is prepared by a reaction of the polyester and a dimercaptan compound. The invention relates to a novel monomer and a polymer. The preparation processes for the monomer and the polymer provided by the invention have the characteristics of rich raw material sources, simple preparation process, no generation of flammable and explosive low-boiling-point volatile matters, greenness, environmental friendliness and universality.

The preparation method comprises the following steps: by taking 3, 3'-diaminobenzidine, p-benzoquinone, F127 and a metal iron salt as raw materials, synthesizing iron-nitrogen co-doped nanospheres through a simple quinone amine polymerization process, and pyrolyzing the iron-nitrogen co-doped nanospheres in an ammonia gas and argon mixed atmosphere to obtain an iron-nitrogen co-doped porous carbonsphere material, namely the iron-nitrogen co-doped porous carbon sphere material, wherein the material has excellent electrocatalytic oxygen reduction performance. The preparation method has the advantages that the preparation method is simple, low in cost and suitable for engineering amplification and large-scale preparation; the porous carbon spheres are good in sphericity degree, complete in structure, uniform in particle size, large in specific surface area and rich in pore structure, and exposure of catalytic active sites and adsorption of oxygen are facilitated; through co-doping of heteroatom nitrogen and transition metal iron, the electrocatalytic activity of the material can be effectively improved, and the material has important significance and value in the field of preparationof porous carbon electrocatalysts.

The invention relates to high-rigidity, high-toughness and low-shrinkage-percentage bulk molding compound and a preparation method thereof. The bulk molding compound is prepared from the following ingredients in weight percentage: 20% to 30% of unsaturated polyester resin, 8% to 12% of polyurethane elastomer resin, 1% to 5% of thermoplastic resin, 8% to 14% of antishrinking agent, 0.2%to 0.4% of tert-butyl peroxybenzoate, 0.2% to 0.4% of tert-butyl cyclohexane peroxide, 0.02%to 0.05% of p-benzoquinone solution, 0.02% to 0.05% of tert-butyl phthalate xylenol solution, 1% to 2% of releasing agent, 15% to 30% of aluminum hydroxide, 1% to 8% of calcium carbonate and 15% to 30% of alkali-free chopped glass fiber. According to the bulk molding compound, the polyurethane elastomer resin and the linear thermoplastic resin are introduced, the polyurethane elastomer resin can be mixed and cross-linked with the unsaturated polyester resin, the linear thermoplastic resin can form a cross network structure with the unsaturated resin, not only are rigidity and toughness of the bulk molding compound obviously improved, but also the shrinkage rate of the bulk molding compound is reduced.

The invention provides a method for obtaining high-concentration p-benzoquinone from an aniline-oxidized oxidized material by adopting multi-stage circulation continuous extraction. The method comprises the steps of adding a water suspension of the aniline-oxidized oxidized material containing 3-10% of p-benzoquinone into a high-speed continuous mixing machine, adding n-butyl acetate and sec-butyl acetate as well as isomer series, methyl isobutyl ketone and acetic ether according to a volume ratio of the oxidized material to an extracting agent of 10:(4-5), mixing with stirring for 10-15 minutes, delivering a mixed solution containing inorganic salts including a p-benzoquinone solute, the extracting agent, manganese mud, manganese sulfate, ammonium sulfate and the like into a solid-liquid separator to ensure that solid manganese mud is separated from liquid. The liquid enters a multi-stage reverse flow continuous extraction system, and the solid manganese mud enters a solvent recovery system. The technical scheme disclosed by the invention does not need water vapor high-temperature extraction to cause decomposition of benzoquinone, so that the yield of p-benzoquinone is influenced, the yield of the p-benzoquinone can be influenced. The yield of the p-benzoquinone in the invention reaches more than 98%, an extraction reagent is easily available, and the method and equipment are simple.

The invention relates to a method for preparing aldehyde or ketone by catalyzing oxygen to oxidize organic alcohol. According to the invention, organic alcohol, a composite catalyst, and an organic solvent or deionized water are mixed and uniformly stirred, such that a reaction system is obtained; in oxygen or air, under a temperature of 50-240 DEG C, a reaction is carried out for 0.5-10h, such that a target product can be obtained. The composite catalyst is composed of a mixture of 2,3-dichloro-5,6-dicyano p-benzoquinone, sodium nitrite and halogenated succinimide. The method has the advantages that: the catalytic components in the composite catalyst are cheap and easy to obtain; with the catalyst, oxygen can be catalyzed with high efficiency and high selectivity for oxidizing organic alcohol to produce aldehyde or ketone; reaction byproduct is water, such that pollution is low, the method is environment-friendly, and the product is easy to treat; only organic alcohol and oxygen molecules are consumed during the entire process, such that cost is low, technical and economic requirements can be satisfied, and the method has good application prospect. The reaction system is a catalytic reaction system with wide application prospect.

The invention relates to tetra-(0,0-dialkyl phosphonyl) p-benzoquinone and a preparation method thereof. The structure of the compound is shown in the specification, wherein R is straight chain or branched chain alkyl containing 1-8 C atoms. The preparation method comprises the following steps: adding a certain molar ratio of chloranil and tris phosphite (P(OR)3) into an organic solvent under the heating condition for carrying out sustained reaction for a period of time, and then, purifying and drying the reactants to prepare the tetra-(0,0-dialkyl phosphonyl) p-benzoquinone. The tetra-(0,0-dialkyl phosphonyl) p-benzoquinone of the invention has high flame resistance, stable physical and chemical properties and good compatibility with high molecular materials, can be used as the flame retardant of polyester, polyamide, epoxy resin, glass reinforced plastic resin, paint and the like, is favorable for environment protection, has simple process, low equipment investment, low cost and high phosphorus content in products, and can realize scale production easily.

The invention provides a beneficiation reagent for copper sulfide ore. The reagent is prepared from diesel oil, cyanoethyl diethyl dithionocarbamate, isopropyl ethionine ester, phenylethyl isopropyl phenyl phenol polyoxyethylene ether, para-benzoquinone dioxime, sodium oleate, sodium fluoride, sodium sulfide and an activator. Through application of the reagent in the beneficiation of the copper-nickel polymetallic sulfide ore, the content of magnesium oxide in copper-nickel mixed concentrate can be reduced, and the metal recovery rate of the copper-nickel polymetallic sulfide ore can be obviously improved, so that the existing copper-nickel ore resources are fully, efficiently and comprehensively utilized.

The invention discloses a pyran compound and a synthesis method thereof. The pyran compound has a structural formula (1) or (2). The pyran compound is synthesized from propargyl p-benzoquinone methylate, 4-hydroxycoumarin and a derivative thereof or a 1, 3-diketone compound at room temperature. According to the synthesis method, the pyran compound can be efficiently synthesized under a mild condition, the product yield reaches up to 99%, the pyran compound shows excellent inhibitory activity on alpha-glucosidase, the 3 + 3 cyclization initiated by 1, 8-conjugate addition of the 4-hydroxycoumarin and the 1, 3-dicarbonyl compound and propargyl (aza)-p-quinone methylate generated in situ under the catalysis of Bronsted acid is realized, and the application value is high.

The invention discloses a novel method for preparing fluorescent copper nano-particles for polyadenylic purine DNA template, as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a copper sulfate aqueous solution into a 3-(N-morpholine) propanesulfonic acid (MOPS) buffer solution containing polyadenylic purine DNA and ascorbic acid by using the polyadenylic purine DNA as a template and ascorbic acid as a reducing agent to prepare copper nano-particles with fluorescent property at normal temperature. The preparation method is simple and quick and has low cost, and the prepared fluorescent copper nano-particles have the advantages of low toxicity, good stability, strong fluorescent signal, good biocompatibility and the like; and the fluorescent copper nano-particles show potential application in the aspect of biochemical analysis due to the wide source of copper. By utilizing the fluorescence quenching effect of p-benzoquinone for the copper nano-particles, high-sensitive detection on the p-benzoquinone can be realized, and the detection limit can reach 1*10<-10>mol / L.

The invention relates to an application of chitosan / cellulose composite microsphere immobilized copper in preparation of the diphenyl silane compound, the catalytic material takes chitosan / cellulose composite microspheres as the carrier, and an active component is copper; the specific content is as follows: the chitosan / cellulose composite microsphere immobilized copper catalytic material (CC@Cu) is taken as the catalyst, the bis (pinacolato) diboron dimethyl silicon reagent is taken as the silicon reagent, pure water is taken as the solvent, and silicon addition reaction is respectively carried out on p-benzoquinone methyl compounds containing different substituent groups to obtain the diphenyl silane compound. The CC@Cu catalytic material disclosed by the invention is high in catalytic activity, can be applied to catalysis of silicon addition reaction of various different types of p-benzoquinone methyl compounds, and has the advantages of small catalyst dosage, mild reaction conditions and high product yield; in addition, the pure water is used as the solvent, operation is carried out at room temperature, and operation is simple and easy; the applicability is wide, and the characteristic of the one-pot method is achieved; besides, the catalytic material can be repeatedly used for multiple times, so that the cost is saved, and the catalyst is environment-friendly and suitable for industrial application.

The process of producing para-benzoquinone with reuse of recovered pyrolusite powder includes: throwing pyrolusite powder and 36 % concentration dilute sulfuric acid solution in the ratio of 1 g to 2-2.5 ml into one oxidizing tank, dropping aniline in the amount of 20 wt% of pyrolusite powder to react, distilling to obtain para-benzoquinone after finishing reaction, separating the residual liquid in a gravitational settler into waste liquid and manganese dioxide dreg, recovering manganese with the waste liquid, separating manganese dioxide powder from manganese dioxide dreg through gravitational settling, and returning the manganese dioxide powder to the oxidizing tank for further para-benzoquinone production. The present invention has high product yield, high pyrolusite powder utilizing rate and high economic benefit.