68results about How to "Suitable for large-scale synthesis" patented technology

The invention relates to a preparation method of a boron nitride nano tube. The method comprises the steps of carrying out ball milling on metal magnesium powder and low-cost boron oxide as a boron source instead of B to prepare a precursor; preparing the pure-phase boron nitride nano tube with a high length-diameter ratio in high-temperature ammonia gas atmosphere in a vertical induction heating furnace. According to the invention, used raw materials are boron oxide powder and metal magnesium powder which both belong to ordinary chemical raw materials which are industrially produced, are low and easily available and non-toxic; the synthesized boron nitride nano tube is high in purity, large in length-diameter ratio, little in defect and uniform in morphology; the method is non-toxic, reliable and suitable for synthesis on large scale; the prepared boron nitride nano tube can be applied to the fields of nanoelectronics, electronic heat dissipation elements, solid/liquid lubricants, nano composite materials, high-temperature structure members and the like.

The invention discloses a synthesis method of an aminomethylated imidazo[1,2-a]pyridine compound; and according to the synthesis method, N-aryl glycine and imidazo[1,2-a]pyridine carry out decarboxylation coupling reactions in the presence of visible light. In an organic solvent, N-aryl glycine and imidazo[1,2-a]pyridine derivatives carry out reactions to prepare the aminomethylated imidazo[1,2-a]pyridine compound under the irradiation of visible light. The structure of the compound is tested and characterized by 1H NMR, 13C NMR, and HR-MS so as to determine the structure. The preparation method does not need any photo-sensitizer or additive, oxygen in the air is taken as the final oxidizing agent, and N-aryl glycine is induced by light to carry out decarboxylation, is oxidized, and reactswith imidazo[1,2-a]pyridine to prepare the aminomethylated imidazo[1,2-a]pyridine compound. The synthesis route is simple, convenient and efficient, the reaction conditions are middle, the operationis simple, and the synthesis method is environmentally friendly, can be applied to large scale production, and has a very good application prospect.

The invention discloses an asymmetric synthesis method of 3-(3,4-dihydroxy phenyl)-2-hydracrylate, which comprises the following concrete steps: reacting 3,4-dihydroxy benzene formaldehyde as a raw material with propandioic acid in a Knoevenagel condensation reaction mode under the protection of the phenolic hydroxyl group to obtain Z-3-(3,4-dibenzyloxyphenyl)acrylate, carrying out asymmetric dihydroxylation reaction to respectively obtain 3-(3,4-dibenzyloxyphenyl)-2,3-dihydroxyl propionate, and finally, carrying out catalytic hydrogenation to obtain the target product. The method provided bythe invention has the advantages of easy acquisition of raw materials and high optical purity of the product, is simple and convenient in operation, and is suitable for large-scale synthesis.

The invention pertains to polymeric material field, which mainly relates to a method for synthesis of organic and inorganic composite silica nano line. The method adopts amorphous silica as silicon source, and under the condition that Fe exists, the organic and inorganic composite silica nano line is obtained by one-step liquid-gas phase reaction of organic amine solution. The synthesis method is simple with low cost. The produced organic-inorganic composite silica nano line has the advantages of good fluorescence activity, large specific surface area, good insulation performance and rich surface silanol groups, thus having high application potential in the fields such as assembly of micronano device, study of nano array and nano optical transmission and nano high insulation resistance; at the same time, as a novel nano material, the organic-inorganic composite silica nano line also has broad developing prospect in the fields such as traditional industrial catalyst, polymer material reinforcement, cosmetic whitening and ultraviolet ray prevention, etc.

The invention belongs to the field of environmental catalysis, and particularly relates to a preparation method of a supported catalyst and application of the supported catalyst in catalytic oxidationfor benzene removal. A stepwise immersion method is adopted, a noble metal salt is mixed with a metal oxide firstly, then the mixture and a rare earth metal salt are immersed, and then direct curingis performed in the air, or after high temperature reduction is performed in a H2 atmosphere, curing treatment is performed. Interactions between metal and the rare earth metal oxide and between the rare earth metal oxide and a carrier are regulated through in-situ loading of the rare earth metal oxide, so that the activity of the supported catalyst for catalytic oxidation of benzene is improved greatly. The synthesis method has universality, simple operation, no obvious metal loss and easy enlarged synthesis, the prepared catalyst has a wide temperature range for catalytic oxidation of benzene, and the catalyst has good stability and is not easy to inactivate at high temperatures.

The invention discloses a dicarbonyl bridged pyrrolo-pyrrole-dione polymer as well as a preparation method and application thereof. The structural formula of the dicarbonyl bridged pyrrolo-pyrrole-dione polymer is shown by formula I. As shown in the formula I, R is selected from any one of C5-C80 (preferably C5-C50) linear or branched alkyl, and n is a polymerization degree that is 5-200. The invention also provides a preparation method of the polymer shown by the formula I. The synthetic route of the polymer disclosed by the invention is simple and feasible, is few in synthetic step, and is suitable for large-scale synthesis. The mobility ratio and on-off ratio of a field-effect transistor prepared by taking the dicarbonyl bridged pyrrolo-pyrrole-dione polymer disclosed by the invention as an organic semiconductor layer are relatively high, the mobility ratio is 0.54cm<2>V<-1>s<-1>, and the on-off ratio is greater than 10<6>. The polymer disclosed by the invention has a good application prospect in an organic field-effect device.

The invention relates to a high temperature sintering resistive loading type noble metal catalyst for catalytic oxidation for carbon monoxide and a preparation method thereof. The catalyst comprises acarrier, active components and a cladding shell layer, wherein the carrier is TiO2 or CeO2 nanoparticles; the active components are noble metals Au, Pt or Pd nanoparticles; the active components areloaded on the surface of the carrier; the cladding shell layer which is SiO2 shell layer and clads the surfaces of the carrier nanoparticles and the noble nanoparticles of the active components. The method is simple; the condition is mild; the period is short; massive synthesizing can be carried out; and the environment is influenced a little.

The invention relates to chiral oxazoline NNP type ligands as well as a synthesis method and an application thereof. The ligands adopt the structure shown in general formula 1 or 2. During preparation, a chiral ligand 1 and a chiral ligand 2 are prepared from Fmoc-Cl and a chiral amino acid compound 3 used as initial raw materials through multi-step reactions. The ligands can be applied to catalytic synthesis of chiral beta ketone ester fluoride and synthesis of propanedione derivatives and chiral malonate derivatives through palladium-catalyzed asymmetric allyl substitution reactions. Compared with the prior art, the reaction condition is mild, operation is easy, repeatability is good, mass preparation can be realized, and the prepared catalyst has higher ee value and yield when applied to beta ketone ester fluoridation and palladium-catalyzed asymmetric allyl substitution reactions.

The invention relates to an NON type chiral bisoxazoline ligand and a synthesis method and application thereof. The ligand has a bisoxazoline structure as shown in a general formula 1, the synthesis method of the NON type chiral bisoxazoline ligand comprises the following steps: taking an o-iodobenzoic acid compound as an initial raw material, performing acylating chlorination on a benzoisofuranylalkylene dicarboxylic acid skeleton prepared through multi-step reaction, performing condensation with chiral amino alcohol, and finally performing cyclization to obtain a ligand 1 which is used for catalytic synthesis of chiral fluorinated beta-ketone ester. Compared with the prior art, the synthesis method disclosed by the invention is simple and efficient, mild in synthesis condition and easy to operate and good in repeatability, and the corresponding metal complex shows good catalytic activity and stereoselectivity in the asymmetric fluorination reaction of beta-ketone ester.

The invention provides a graphene supported two-dimensional branched platinum nanometer electrocatalyst, and a preparation method and an application thereof. The preparation method concretely comprises the following steps: dispersing graphene in an aqueous solution containing a lipid bilayer and a reducing agent, adding a platinum salt, and reacting for at least 30min to obtain the graphene supported two-dimensional branched platinum nanometer electrocatalyst with the thickness of 2-3nm. The method has the advantages of simple operation, easy control, mild conditions and environmental protection. The graphene supported two-dimensional branched platinum nanometer electrocatalyst can be used in proton exchange membrane fuel cells.

The invention discloses a nano-scale cube CoSnO<3> and graphene composite material. The composite material is characterized in that nano-scale cube CoSnO<3> and gauzy graphene form a coating structure. The nano-scale cube CoSnO<3> and graphene composite material is prepared by a simple and easy method, wherein the nano-scale cube CoSnO<3> is uniformly coated with graphene, and by virtue of graphene coating, the conductivity of the CoSnO<3> material is greatly improved; meanwhile, volume expansion of the CoSnO<3> material is also relieved, and pulverization and falling off of the electrode material are also suppressed effectively; and therefore, when the nano-scale cube CoSnO<3> and graphene composite material prepared in the invention is used as the negative electrode material of a sodiumion battery, excellent discharge specific capacity and stable cycle performance are represented.

The invention discloses a ball follow-shaped yttrium oxide self-assembly thin film and a preparation method thereof, wherein the method comprises the following steps: (1) soaking a substrate impregnated with anhydrous ethanol in a solution of zinc nitrate and hexamethylenetetramine, and carrying out a first hydrothermal reaction, to generate a zinc oxide nanorod array thin film on the substrate; and (2) soaking the substrate obtained in the step (1) and generated with the zinc oxide nanorod array thin film in a yttrium nitrate solution, and carrying out a second hydrothermal reaction. The preparation method omits a template removal step, and is simple in process, low in energy consumption, flexible but not harsh in preparation conditions, and suitable for large-scale production.

The invention discloses a method for synthesizing hyaluronic acid from monosaccharides as initial substrates by multienzyme coupling. Two monosaccharides are used as initial substrates to synthesize the hyaluronic acid by coupling of the multienzyme system. The method couples the enzyme-process synthesis of sugar nucleotide by using monosaccharides as the substrates and the hyaluronidase-process synthesis by using the sugar nucleotide as the substrate; the monosaccharides used as the initial substrates are low in price and easy to obtain, thereby avoiding the supply of the expensive sugar nucleotide and greatly lowering the production cost of the enzyme process for synthesizing hyaluronic acid; and meanwhile, the synthesis of hyaluronic acid by multienzyme coupling can effectively avoid the defect of endotoxin residues in the hyaluronic acid microbial fermentation production technique. The method has the advantages of simple technique, mild conditions and no pollution, is easy to operate and suitable for large-scale synthesis of hyaluronic acid, and has wide application prospects.

The invention belongs to the technical field of organic chemical synthesis, and discloses a 5,5'-bitetralone chiral skeleton, a chiral phosphoric acid with the 5,5'-bitetralone skeleton, and a method for preparing the chiral phosphoric acid on the basis of 5,5'-bitetralone-6,6'-diphenol and substitutes thereof. The phosphoric acid maintains the advantages of favorable enantioselectivity in the chiral phosphoric acid based on BINOL and H8-BINOL in tradition, and also has excellent enantioselectivity in some organic reactions. The chiral phosphoric acid with the 5,5'-bitetralone skeleton overcomes the defect of lower catalytic activity, and has higher reaction activity than the traditional phosphoric acid. The preparation method has the advantages of cheap and accessible raw materials and catalyst, shorter synthesis route, simple technique and mild conditions, and has industrialization potential.

The invention discloses a chiral 4-halogenated tryptophan derivative and a synthetic method thereof, and the synthetic method comprises the following steps: S1, sequentially adding an N-acylglycine derivative, anhydride and carboxylate into a compound 1, and carrying out a condensation reaction to obtain a compound 2; S2, mixing the compound 2 with alcohols and metal alkoxy compounds, and carryingout alcoholysis ring opening to obtain a compound 3; and S3, mixing the compound 3 with a complex formed by a catalyst and a ligand, hydrogen and an alcohol solvent, and carrying out an asymmetric hydrogenation reaction to obtain a compound 4, namely the chiral 4-halotryptophan derivative. According to the synthetic method, the chiral 4-halotryptophan derivative 4 is prepared with the effects ofhigh yield and high enantioselectivity, and the synthetic method is simple to operate, low in cost, green, economical and suitable for large-scale synthesis.

The invention discloses a trifluoromethyl-containing conjugated polymer, and a preparation method and applications thereof. The trifluoromethyl-containing conjugated polymer is represented by formulaI. The synthesis route is simple and convenient; synthesis steps are few; yield is high; the preparation method is suitable for large scale preparation. Field effect transistors prepared taking the trifluoromethyl-containing conjugated polymer as organic semiconductor layers are relatively high in mobility and on/off ratio; the mobility is 0.11cm<2>V<-1>s<-1>, and the on-off ratio is larger than 105. It is shown by research results that the trifluoromethyl-containing conjugated polymer is an excellent electron transport material, and is promising in application prospect in the field of organicfield effect.

The invention relates to a synthesis method of a porous hexagonal boron nitride fiber, which comprises the following two synthesis steps: 1, preparing a porous hexagonal boron nitride fiber precursor through hydrothermal synthesis; and 2, under a protective atmosphere, performing high temperature pyrolysis to obtain the porous hexagonal boron nitride fiber having a high specific surface area and a large pore volume (including micro pores and meso pores). The hexagonal boron nitride fiber product obtained through the method has the advantages of high crystallization degree, high purity, high specific surface area, large pore volume, simple method, no toxicity, high reliability and low price, and is suitable for large-scale synthesis. The obtained porous hexagonal boron nitride fiber has high hydrogen storage capability, and the mass ratio of stored hydrogen can be up to 5.6%, thus ensuring that the invention has wide application prospects in the field of clean energy.

The invention discloses a synthesis method of cadmium telluride quantum dots and a synthesis method of Type II cadmium telluride core-shell quantum dots. The synthesis method of cadmium telluride quantum dots comprises the following steps: adding a cadmium source, a tellurium source, a ligand and an organic dielectric into a reaction kettle at room temperature, heating to 220 DEG C in a nitrogen or argon protective atmosphere to react for 5-20 minutes, heating to 230-245 DEG C, and keeping the temperature to react for 5-30 minutes to obtain the cadmium telluride quantum dots. The chemical structural formula of the Type II cadmium telluride core-shell quantum dot is CdTe/CdSe or CdTe/CdS, and the process of coating cadmium selenide or cadmium sulfide on the cadmium telluride quantum dots is performed by a phosphine-free in-situ heating process. The synthesized cadmium telluride quantum dots and Type II cadmium telluride core-shell quantum dots can emit 530-800nm; and in the 550-650nm wave band, the fluorescent quantum yield is greater than or equal to 40%, and the maximum yield can reach 75%.