23 results about "Copper bromide" patented technology

The invention discloses a synthesis method of a mono / dibromo pyridine derivative, which comprises the following steps: reacting a pyridine derivative with dimethyl butynedioate and methyl pyruvate at room temperature by using acetonitrile as a solvent to generate a dearomatized heteroaromatic compound; in an oxygen environment, copper bromide is used for brominating the dearomatized heteroaromatic compound to realize dibromination, and if potassium carbonate is additionally added in the reaction, monobromination is realized; and finally, respectively generating mono / dibromopyridine derivatives under hydrochloric acid hydrolysis. A carbon halogen bond of bromopyridine has very high activity, and various reactions such as Suzuki coupling, Sonogashira coupling, Heck reaction, amination reaction and the like can be carried out. On the basis, the polysubstituted bromopyridine can be subjected to selective reaction, and many new ideas can be provided for organic synthesis. The method disclosed by the invention is simple and safe to operate and environment-friendly, the cost is lower by using the copper bromide, and the required reaction conditions are simple.

The invention discloses a method for preparing phenylephrine hydrochloride genotoxic impurities, which comprises the following steps: by taking 3-hydroxyacetophenone as a starting material and copper bromide as a bromine source in isopropanol, reacting, and then preparing and separating to obtain dibromide impurities. The reaction condition for preparing the phenylephrine hydrochloride genotoxic impurity is mild, the operation is simple, the product purity is high, and the quality requirement for controlling phenylephrine hydrochloride can be met.

A polyimide resin composition containing a polyimide resin (A) and an antioxidant (B), wherein the polyimide resin (A) contains a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of the formula (1) with respect to the total of the repeating structural unit of the formula (1) and the repeating structural unit of the formula (2) is 20 to 70 mol %, and the antioxidant (B) contains one or more copper compounds (B1) selected from the group consisting of copper fluoride, copper bromide, copper iodide, and copper carboxylates, or a cerium-containing compound (B2);wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic group.

The application discloses a cesium copper bromide-silver bromide heterojunction photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalytic material for preventing and treating air pollution. The preparation method comprises the following steps: dissolving cesium bromide and copper bromide in dimethyl sulfoxide, and obtaining cesium copper bromide by using an anti-solvent recrystallization method; dispersing the cesium copper bromide into an isopropyl alcohol solution, adding a silver nitrate-isopropyl alcohol solution, sealing the obtained mixed solution, continuously stirring under light irradiation, and obtaining the cesium copper bromide-silver bromide heterojunction photocatalyst through centrifugation, washing and drying. The cesium copper bromide-silver bromide heterojunction photocatalyst provided by the application has stronger photocatalytic reduction capacity, and can greatly improve the activity of the cesium copper bromide-silver bromide in photocatalytic reduction of carbon dioxide.

This invention discloses an aqueous copper-ion battery electrolyte, its preparation method, and the copper-ion battery itself. The electrolyte comprises a copper salt, a solvent, and a copper halide salt additive. The copper salt is copper sulfate, and the solvent is deionized water. The concentration of the copper salt in the electrolyte is 0.5–1.5 mol / L. The copper halide salt additive is selected from one or more of copper fluoride, copper chloride, and copper bromide, and the total concentration of the copper halide salt additive in the electrolyte is 0.005–0.2 mol / L. When the electrolyte of this invention is used in an aqueous copper-ion battery, the halide ions in the copper halide salt additive can preferentially adsorb onto the surface of the metallic copper anode, inducing uniform copper deposition and inhibiting the formation of by-products. This significantly improves the coulombic efficiency and cycle stability of the aqueous copper-ion battery. Furthermore, the electrolyte preparation process is simple, low-cost, and environmentally friendly, making it suitable for large-scale energy storage scenarios.

The invention provides a preparation method of polystyrene with controllable molecular weight, which comprises the following steps: under the protection of inert atmosphere, adding a reducing agent into a water-free and oxygen-free organic solvent, then adding a styrene monomer, a catalyst and a dormancy initiator, and controlling the temperature to carry out polymerization reaction; after the reaction is finished, terminating the reaction, and carrying out post-treatment to obtain polystyrene; wherein the catalyst is a copper bromide / pentamethyldiethylenetriamine complex; the dormancy initiator comprises any one or a combination of at least two of alkyl chloride, alkyl bromide or alkyl iodide; the reducing agent is graphene oxide grafted with a phenolic hydroxyl group, and the active component phenolic hydroxyl group is grafted on the carrier graphene oxide. The supported reducing agent is adopted, the dynamic environment of polymerization reaction is fundamentally changed, and the free radical concentration in the system is controlled at an extremely low level, so that the occurrence rate of side reaction is fundamentally and greatly reduced, and controllable molecular weight is realized; belongs to the technical field of organic synthesis.

The invention discloses a method for synthesizing lead-free Cu: CsBr perovskite (Cu: CsBr NCs) stable in an aqueous solution by using a one-pot method, which comprises the following steps of: selecting cesium carbonate, copper bromide and citric acid as reactants, and oleic acid and oleylamine as surface ligands, adding a proper amount of octadecene or mineral oil, performing ultrasonic treatment to obtain a Cu: CsBr-coated CC solution, and centrifuging, purifying and drying the solution to obtain the lead-free Cu: CsBr-coated CC perovskite (Cu: CsBr NCs) stable in the aqueous solution. Cu: CsBr (at) CC powder is obtained. The method disclosed by the invention is simple to operate, short in time and good in repeatability, can be synthesized by only one step, and the prepared compound is good in solubility in an aqueous solution, excellent in dispersity, stable in fluorescence and easy to store.

This invention relates to the field of lithium iron phosphate, specifically to a porous carbon-supported metal oxide-modified lithium iron phosphate cathode material and its preparation method; it addresses the problems of poor electronic conductivity and poor cycle performance of existing lithium iron phosphate. The porous carbon-supported metal oxide-modified lithium iron phosphate cathode material comprises B / F / N-doped porous carbon-supported yttrium oxide-modified lithium iron phosphate, conductive carbon black, sodium carboxymethyl cellulose, and N-methylpyrrolidone. The preparation method first prepares lithium iron phosphate, using 4-formylphenylboronic acid and 2,3,5,6-tetrafluoro-1,4-phenylenediamine to prepare a precursor, which is then combined with copper bromide to prepare B / F / N-doped porous carbon. Yttrium oxide is then loaded onto the porous carbon and modified onto the surface of the lithium iron phosphate. This provides better ion transport channels during charge and discharge, enhancing the kinetic performance and stability of lithium iron phosphate during charge and discharge, ultimately improving the overall performance of the battery.

The application provides a fluorinated cyclodextrin macromolecular adsorbent and a preparation method and application thereof, and belongs to the technical field of lithium ion adsorbents, and aims to solve the technical problems of poor lithium ion adsorption effect and low selectivity of existing lithium adsorbents. The preparation steps of the application comprise the following steps: firstly, dissolving beta-cyclodextrin in an organic solvent and reacting with 2-bromoisobutyryl bromide to obtain an intermediate product bromoisobutyryl beta-cyclodextrin; and then, performing a polymerization reaction on the bromoisobutyryl beta-cyclodextrin with a fluorine-containing monomer, copper bromide, N,N,N',N",N"-pentamethyldiethylenetriamine and tin (II) isooctoate to obtain a beta-cyclodextrin adsorption material with a surface grafted fluorine-containing polymer chain. The preparation method has the advantages of simple process and mild reaction conditions. The adsorption material has a high lithium ion adsorption capacity, which can reach 43.5 mg / g, and can efficiently and selectively recover lithium ions from a complex solution containing competitive ions such as sodium, potassium, magnesium, calcium and cobalt.

This invention relates to a photoelectrocatalytic reaction device without external bias and its applications, belonging to the field of energy materials and catalysis technology. The invention utilizes nanosheet nickel hydroxide, prepared by electrodeposition on hydrophilic carbon paper, as a catalyst for the oxidation of 5-hydroxymethylfurfural (HMF). A binuclear copper molecule is synthesized as a carbon dioxide (CO2) reduction catalyst via a reflux reaction of 1,2-bis(diphenylphosphine)benzene and copper bromide. The HMF oxidation catalyst is connected to the anode of a triple-junction gallium arsenide battery, encapsulated, and placed in the anode chamber. A hydrophobic carbon paper loaded with the binuclear copper molecule catalyst is connected to the cathode. Under no external bias, the anode efficiently oxidizes HMF to FDCA (2,5-furandicarboxylic acid) through the synergistic effect of nickel hydroxide and tetramethylpiperidine oxide (TEMPO), while the cathode simultaneously reduces CO2. This system exhibits high selectivity, high conversion rate, and excellent catalytic efficiency. The device is reusable, and the catalyst preparation is simple and the raw materials are inexpensive and readily available.

A method for realizing living / controlled free radical polymerization of hydrophilic and / or hydrophobic monomers under air conditions is provided. The functional monomer including hydrophobic monomer, halide, copper bromide, ligand and non-ionic surfactant-GOx is used to initiate the polymerization of monomer in a solvent through initiator azodiisobutyric imidazoline hydrochloride (VA-044) to form polymer with narrow target molecular weight and molecular weight distribution.

The application relates to a preparation method of arolool hydrochloride, which uses 5-acetylthiophene-2-carboxamide as raw material and only uses a catalytic amount of copper bromide to prepare a key intermediate 5-(2-sulfhydryl-4-thiazolyl)-2-thiophene carboxamide through one-pot bromination and cyclization.

The invention discloses a method for synthesizing a 2-aryl-(hetero) ring 1, 3-dicarbonyl compound from aryl iodine ylide. According to the invention, copper bromide is used as a catalyst, at least one of carbonate and phosphate is used as alkali, at least one of dichloroethane and acetonitrile is used as a solvent, the reaction can be rapidly carried out under mild conditions to obtain the required target product, and the yield is relatively high. The method is suitable for most aryl iodine ylide compounds to react to generate the 2-aryl-(hetero) ring 1, 3-dicarbonyl compound, and the application range is wide.

This invention provides a high-viscosity, high-temperature resistant dimer acid type polyamide hot melt adhesive and its preparation method, comprising the following components by mass fraction: 100 parts dimer acid type polyamide, 0.01-0.1 parts free radical initiator, 0.25-0.5 parts tris(triphenylphosphine)copper bromide, 0.5-1.0 parts hindered phenolic antioxidant, 1-5 parts polyether defoamer, and 0.1-0.5 parts higher alcohol defoamer. The preparation method provided by this invention is simple and highly operable. The dimer acid type polyamide hot melt adhesive prepared by this method possesses excellent temperature resistance and high viscosity, expanding the application range of existing dimer acid type polyamide hot melt adhesives.

The invention discloses a cesium copper bromide-silver bromide heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of air pollution prevention and control of photocatalytic materials. The preparation method comprises the following steps: dissolving cesium bromide and copper bromide in dimethyl sulfoxide, and obtaining cesium copper bromide by using an anti-solvent recrystallization method; the preparation method comprises the following steps: dispersing cesium, copper and bromine into an isopropanol solution, adding a silver nitrate-isopropanol solution, sealing the obtained mixed solution, continuously stirring under the condition of illumination, centrifuging, washing and drying to obtain the cesium, copper and bromine-silver bromide heterojunction photocatalyst. The cesium-copper-bromine-silver bromide heterojunction photocatalyst provided by the invention has stronger photocatalytic reduction capability, and the activity of the cesium-copper-bromine-silver bromide for photocatalytic reduction of carbon dioxide can be greatly improved.

The invention discloses a bio-based antibacterial fabric and a preparation method thereof, and relates to the technical field of fiber fabrics. When the bio-based antibacterial fabric is prepared, a cotton fabric is finished by allyl phosphine dichloride to prepare a pre-modified cotton fabric; the preparation method comprises the following steps: carrying out a reaction on 3, 5-dihydroxy benzoic acid and 2, 4-dichloro-6-vinyl-1, 3, 5-triazine to prepare a boron-nitrogen composite flame retardant; the preparation method comprises the following steps: sequentially reacting 2, 2 '-dimethyl pyridylamine with 4-chloro-1-butene and copper bromide to prepare an organic copper antibacterial agent; finishing the pre-modified cotton fabric with a boron-nitrogen composite flame retardant and an organic copper antibacterial agent to obtain a modified cotton fabric; and spraying the hydrophobic finishing liquid to one side of the modified cotton fabric by adopting an online spraying technology to prepare the bio-based antibacterial fabric. The bio-based antibacterial fabric prepared by the invention has excellent one-way moisture conductivity, flame retardance, antibacterial property and mechanical property.

The invention relates to the technical field of free radical polymerization, in particular to a catalyst system for photo-induced atom transfer radical polymerization and application of the catalyst system. A catalyst system for light-induced atom transfer radical polymerization comprising: (a) copper bromide; and (b) a mixed ligand composed of a first ligand and a second ligand, wherein the first ligand is Me < 6 >-TREN; and the second ligand is one or more than two micromolecule amines selected from ammonia water, piperidine and derivatives thereof, piperazine and derivatives thereof, piperazinone and derivatives thereof, morpholine and derivatives thereof, and tetramethylethylenediamine. According to the invention, trace Me6-TREN is compounded with excessive and cheap chain-shaped or cyclic micromolecule amine, so that a remarkable synergistic interaction effect can be generated, the Me6-TREN shows the same excellent performance as that of single use of the Me6-TREN, and the use cost of the Me6-TREN is greatly reduced.

The application relates to the field of preparation of polymer brushes, and discloses a grafted polymer brush polyimide film and a preparation method thereof, which comprises the following steps: preparing polyimide powder by carrying out polycondensation reaction on diamine monomers and acid anhydride monomers, washing, and drying; carrying out grafting reaction on the polyimide powder and initiator 2-bromoisobutyryl bromide in a pyridine solvent, washing, and drying to obtain polyimide powder grafted with initiators; dissolving the polyimide powder grafted with initiators in an N-methylpyrrolidone solvent, preparing into a film casting solution, coating, and preparing polyimide film; and carrying out reaction on the polyimide film in an oxygen-free atmosphere by immersing the polyimide film in an aqueous solution containing the polymer brush monomers, and adding copper bromide, 2,2'-dipyridyl and ascorbic acid to obtain the grafted polymer brush polyimide film. The initiator 2-bromoisobutyryl bromide is grafted on the polyimide main chain, so that the grafting thickness of the polymer brush reaches the micron level.

The invention relates to the technical field of chemical synthesis of medicines, and particularly discloses a preparation method for synthesizing a fesoterodine chiral intermediate. According to the method, commercially available cheap chiral binaphthol (BINOL) or a derivative thereof (such as 3, 3 '-dibromo-BINOL, 3, 3'-dimethyl-BINOL and 3, 3 '-difluoro-BINOL) is used as a chiral ligand, copper chloride, copper bromide, copper acetate or copper nitrate is used as a catalyst, and an asymmetric conjugate addition reaction of arylboronic acid to 4-hydroxymethylcoumarin is realized. And the target chiral center is directly constructed with high enantioselectivity. According to the method, high-risk and high-cost reagents such as a Grignard reagent and lithium aluminum hydride in a traditional method are abandoned, and meanwhile the problems that in the prior art (such as US8530691B2), resolution is carried out through a chiral resolving agent after raceme synthesis is adopted, so that the atom economy is poor, the process steps are tedious, and the resolving agent is expensive are solved. The method is mild in reaction condition, simple and convenient to operate, high in yield (up to 88.1%), excellent in enantioselectivity (up to 99.1% in ee value), simple in post-treatment and suitable for industrial production.

The application discloses a preparation method of a polyelectrolyte brush for quickly treating heavy metal complex wastewater, and belongs to the water treatment adsorption technical field in the environmental protection field. The specific steps of the method are as follows: (1) after dopamine hydrochloride is dissolved in DMF, an initiator and triethylamine are added, and stirring is carried out for 3 hours, and the solution is recorded as solution A. Solution A is poured into a graphene oxide hydrochloride buffer solution (pH=8.5), mixed and stirred for 1 day, and then solid A is obtained through separation and drying. (2) solid A is ultrasonically dispersed in a solution of methanol and water, and then monomers, copper bromide, a solution initiator and a ligand are added in sequence. After stirring and dissolving, ascorbic acid is added, and stirring is carried out at 30 DEG C for 1 day. After separation and drying, the polyelectrolyte brush is obtained. The polyelectrolyte brush can synergistically adsorb heavy metal complexes by regulating the electrostatic interaction of the polyelectrolyte chain, the organic molecule interaction and the nanometer interface effect of the substrate, so that the heavy metal complexes are quickly adsorbed and enriched in the polyelectrolyte brush, and low-concentration complex heavy metal ions can be efficiently removed.

The invention discloses a preparation method of a P-Betti alkali compound, and belongs to the technical field of organic synthesis. The method disclosed by the invention comprises the following steps: mixing 2-benzylidene-cyclohex-3-ene-1-ketone, diaryl phosphine oxide, alkali and an organic solvent, and carrying out a reaction on the 2-benzylidene-cyclohex-3-ene-1-ketone, the diaryl phosphine oxide, the alkali and the organic solvent; after the reaction is finished, carrying out acid washing, then drying an organic phase, and evaporating to remove a solvent to obtain a mixture containing an allyl phosphine oxide compound; then adding copper bromide and acetonitrile into the allyl phosphine oxide for reaction; and after the reaction is finished, evaporating to remove the solvent, separating and purifying residues, eluting with an eluent, evaporating the eluent to remove the solvent, and drying to obtain the P-Betti alkali compound. The P-Betti alkali synthesis method is high in innovation, mild in reaction condition, high in operation convenience and excellent in functional group compatibility, and the obtained P-Betti alkali compound with the diversified structure is an important organic synthesis intermediate and can also serve as a potential P, O-bidentate ligand to optimize the catalytic performance of transition metal.

The application relates to a synthesis method of 4,4'-dibromo-octafluorobiphenyl and belongs to the field of organic synthesis. The synthesis method comprises two steps: A, in an organic solvent, full-fluorobiphenyl is reacted with hydrazine hydrate under the action of a catalyst to obtain 4,4'-dihydrazino-octafluorobiphenyl; B, 4,4'-dihydrazino-octafluorobiphenyl is reacted with copper bromide in a hydrobromic acid solution, a crude product is separated, and 4,4'-dibromo-octafluorobiphenyl is obtained through recrystallization. The process is suitable for industrial production, raw materials are easy to obtain, conditions are mild, the yield is high, waste is little, and the requirement for equipment is low.

The invention relates to the field of lithium iron phosphate, in particular to a porous carbon loaded metal oxide modified lithium iron phosphate positive electrode material and a preparation method thereof. The method is used for solving the problems of poor electronic conductivity and poor cycle performance of existing lithium iron phosphate. The porous carbon loaded metal oxide modified lithium iron phosphate positive electrode material comprises B / F / N doped porous carbon loaded yttrium oxide modified lithium iron phosphate, conductive carbon black, sodium carboxymethyl cellulose and N-methyl pyrrolidone, the preparation method comprises the following steps: firstly, preparing lithium iron phosphate, preparing a precursor from 4-formylphenylboronic acid and 2, 3, 5, 6-tetrafluoro-1, 4-phenylenediamine, preparing B / F / N doped porous carbon from the precursor and copper bromide, and loading yttrium oxide on the porous carbon and modifying the surface of the lithium iron phosphate, so that a better ion transmission channel can be provided in the charge-discharge process, and the lithium iron phosphate can be used as a lithium ion battery. The dynamic performance and the stability of the lithium iron phosphate in the charging and discharging process are enhanced, and the overall performance of the battery is finally improved.