229results about "Preparation by reductive alkylation" patented technology

The invention relates to the technical field of drug intermediates, in particular to a method for synthesizing chiral indene amine, which comprises the following steps: synthesizing cis-chiral indene amine with high yield and high stereoselectivity by using indanone as a raw material through a ruthenium chiral diphosphine catalyst, and then transposing to obtain trans-chiral indene amine. The method has the advantages that the content of the product chiral indene amine trans-form is larger than 99% and 98% ee, the total yield is larger than 90%, the catalyst is convenient and easy to obtain, operation is easy, raw materials are easy to obtain, three-waste pollution is small, energy consumption is low, and the method is suitable for industrial production.

The invention discloses a layered nickel-aluminum bimetallic oxide loaded bimetallic active component catalyst and a preparation method thereof, and a method for preparing primary amine by reductive amination of a biomass carbonyl compound, and the catalyst is prepared by the following steps: calcining and reducing layered nickel-aluminum bimetallic hydroxide impregnated with noble metal M in a tubular furnace filled with N2 / H2 mixed gas at high temperature; the preparation method of the primary amine comprises the following steps: adding a biomass carbonyl compound, ammonia water, a catalyst and a solvent into a Schlenk glass tube or a reaction kettle, and carrying out reductive amination reaction in a hydrogen atmosphere to obtain the target product primary amine. The catalyst has the characteristics of high specific surface area and unique surface microenvironment effect, the catalytic activity and selectivity of the biomass carbonyl compound reductive amination reaction are improved, the preparation method of the primary amine is simple, the reaction process conditions are mild, the utilization of the renewable biomass carbonyl compound raw material is combined, and the production cost is reduced. And a green closed loop from raw materials to products can be realized.

The invention discloses a method for preparing cyclohexylamine based on reductive amination of cyclohexanone, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: adding a reactant cyclohexanone into a reaction kettle containing a certain amount of solvent, ammonia water and hydrogen atmosphere, and carrying out reductive amination reaction in the presence of a catalyst to obtain cyclohexylamine. The catalyst is CoyAl-LDHs loaded with metal active components, the CoyAl-LDHs are layered cobalt-aluminum bimetal hydroxides, and cobalt ions and precious metal ions in laminates are subjected to spontaneous oxidation-reduction reaction, so that the precious metal ions can be efficiently reduced into active metal nanoparticles. The layered cobalt-aluminum double-metal hydroxide not only has abundant surface acid-base sites, but also has high dispersity of loaded metal nanoparticles. The catalyst preparation and reductive amination reaction conditions are mild, the yield is high, the reaction system is simple and easy to separate, and the method is suitable for industrial production of cyclohexylamine.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

The present invention relates to a method for continuously preparing 5-amino-1-pentanol, 1-amino-2-pentanol, and 1,5-pentanediamine using furfural as a raw material. The method comprises the following steps: After hydrogen and the raw material liquid are preheated to 20-150 °C in a preheater, they are simultaneously introduced into a fixed-bed reactor equipped with two sections of catalysts, and reacted at 30-150 °C and a reaction pressure of 0.1-8 MPa to obtain 5-amino-1-pentanol, 1-amino-2-pentanol, and 1,5-pentanediamine; the first catalyst is a metal catalyst supported on graphitic carbon nitride; the active metal of the second catalyst is one, two, or more of Ru, Pt, Rh, Cu, Co, and Ni; the carrier of the second catalyst is γ-Al2O3, TiO2, SiO2, ZrO2, CeO2, ZSM-5, cerium-zirconium solid solution, or activated carbon. The present invention solves the problem of poor selectivity in the process of generating 1,5-pentanediamine, and the product distribution can be changed by changing the catalyst.

The invention belongs to the technical field of catalysts, and particularly relates to a catalyst, a preparation method thereof and application of the catalyst in synthesis of primary amine compounds. The preparation method of the catalyst comprises the following steps: dissolving Ni (NO3) 2 and terephthalic acid in a solvent, uniformly mixing, carrying out a hydrothermal reaction at a certain temperature to obtain Ni-MOF, washing, drying, and reducing in an H2 / Ar atmosphere to obtain the catalyst Ov-NiO / Ni-C-T (X) (wherein T represents the reduction temperature, the unit is DEG C, and X represents the reduction time, the unit is h). The preparation method of the catalyst is simple, the catalyst can be recycled for 7 times without obvious loss of catalytic activity and selectivity, and the catalyst has high catalytic activity for synthesis of primary amine through reductive amination of aldehyde compounds and ketone compounds.

The invention discloses preparation and application of a reductive amination catalyst. The preparation method of the catalyst comprises the following steps: step 1, preparing an SrTiO3 carrier; step 2, loading a nickel source into the prepared SrTiO3 carrier to form a nickel-loaded SrTiO3 catalyst precursor; and step 3, roasting the SrTiO3 catalyst precursor to obtain the SrTiO3 loaded nickel catalyst. Large-scale production of the non-noble metal catalyst is realized by adopting a co-precipitation method and an impregnation method which are simple in process and environment-friendly under the condition of room temperature, the obtained material can be used for reductive amination reaction of acetophenone under the condition of taking water as a solvent and shows excellent catalytic performance, and after 50 times of application, the acetophenone conversion rate is gt; the selectivity of alpha-phenylethylamine is gt; the selectivity of the alpha-phenethyl alcohol is 1t; and 2%.

The invention relates to an anti-tarnish anti-aging agent and a preparation method and application thereof, the anti-tarnish anti-aging agent has a structure as shown in the following formula (I): # imgabs0 #, the anti-aging agent provided by the invention has similar processability and equivalent processing safety compared with the existing anti-aging agent 4020, but has the outstanding characteristics of large molecular weight, more lasting aging resistance, good compatibility with rubber, difficult blooming and no surface tarnish after long-term use compared with the existing anti-aging agent 4020.

The invention discloses a method for preparing tertiary amines using secondary amines as raw materials. The method comprises the steps of reacting secondary amines as raw materials with acids to generate proton-type ionic liquids, and reacting proton-type ionic liquids and aldehydes under the action of a reducing agent to generate tertiary amines. The secondary amines are fatty secondary amines and / or aromatic secondary amines and / or cyclic secondary amines, the acid is selected from a combination of one or more of organic carboxylic acids and inorganic acids, the aldehyde is a monoaldehyde, a dialdehyde or a polymer of aldehydes, and the reducing agent is selected from a combination of one or more of formic acid, sodium formate, oxalic acid, sodium oxalate and triphenylsilane. The proton-type ionic liquid in the present invention can play a role in self-catalytic reaction, so that while ensuring high yield and high purity of tertiary amine products, mild reaction conditions are achieved, high pressure and hydrogen reduction atmosphere are not required, and safe and green reducing agents can be used.

The invention discloses alkoxy amine and application of the alkoxy amine in induction of NMP (N-Methyl Pyrrolidone) polymerization of methacrylate monomers and styrene monomers. The alkoxy amine is a novel compound which is synthesized by taking benzaldehyde and isopropylamine as raw materials through three-step reaction of Schiff base reduction, oxidizing agent oxidation and free radical coupling. The obtained alkoxyamine can be used as a monomolecular initiator to effectively regulate and control controllable polymerization of methacrylate and styrene monomers under anaerobic or aerobic conditions, and the peak pattern of a gel chromatography outflow curve is symmetrical and has no obvious tailing phenomenon, so that the alkoxyamine can expand the range of nitroxide free radical polymerization regulation and control monomers, and the preparation method is simple and easy to implement. The method has a good application prospect in the aspect of synthesis of functional polymer materials.

Disclosed are processes for the preparation of the pesticide N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide. Also disclosed are methods for the preparation of intermediates of thereof N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide.

The invention discloses a catalyst for reductive amination of aldehyde ketone compounds as well as a preparation method and application of the catalyst. The catalyst comprises an all-silicon molecular sieve and metal particles, the metal particles are distributed in the all-silicon molecular sieve; the average linear size of crystal grains of the catalyst is 50-100 nm; the particle size of the metal particles is 0.5-4 nm; on the basis of the mass of the catalyst, the mass percentage content of the metal particles is 0.1-10wt%; metal elements in the metal particles are selected from at least one of Pd, Pt, Rh, Cu, Ni, Co, Zn and Ag. The catalyst provided by the invention can be applied to reductive amination reaction of aldehyde ketone compounds.

The invention discloses a preparation method of a catalyst for a dehydration condensation reduction reaction, an obtained product and application, and the preparation method comprises the following steps: laying activated carbon in a fixed bed, then continuously introducing a mixed solution of copper nitrate, zinc nitrate and zirconium nitrate into the fixed bed, and enabling the mixed solution to be in full contact with an activated carbon layer; roasting the activated carbon which is in full contact with the mixed solution to obtain activated carbon loaded with copper oxide-zinc oxide-zirconium oxide; dispersing the active carbon loaded with copper oxide-zinc oxide-zirconium oxide into an organic solvent, then adding a vulcanizing agent to carry out vulcanization reaction, and filtering, washing and drying after the reaction to obtain the catalyst for the dehydration condensation reduction reaction. The preparation method of the catalyst is simple and convenient to operate, low in cost and small in environmental pollution, can be applied to dehydration condensation reduction reaction of various ketones or aldehydes and amines, improves the selectivity of the reaction, reduces side reaction products, has a good catalytic effect, and has an industrial development prospect.

The invention discloses a surfactant for selectively extracting perrhenate and an application method of the surfactant, the surfactant is a high-selectivity diamino surfactant, and ammonium perrhenate can be separated and enriched by the surfactant. The application method comprises the following steps: adjusting the pH value of a perrhenate-containing leachate, sequentially adding the diamino surfactant and the bubble dispersant, and introducing gas for flotation to obtain a rhenium-rich component; and after the rhenium-rich component is subjected to pH adjustment, a stripping agent is added for stripping, so that ammonium perrhenate with relatively high purity is obtained. The method is simple in technological process, low in operation cost, good in selective separation effect on ammonium perrhenate, capable of effectively overcoming the defects that a traditional solvent extraction process is tedious and high in extraction agent consumption, and suitable for selective separation of ammonium perrhenate under the low-concentration condition.

The present invention is directed to a method for making a di(aminoaryl)fluorene compound that includes the steps of: (a) reacting a fluorenone compound according structure (I) with excess aminobenzene according to structure (II) wherein: each R1, R2, R3, R4, R12, and R13 is independently a group that is inert in the polymerization of epoxy compounds, and R11 is H or (C1-C6)alkyl, in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150°C and in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150°C and from which the di(aminoaryl)fluorene compound is crystallizable, to form a crude product mixture comprising the di(aminoaryl)fluorene compound, (b) crystallizing di(aminoaryl)fluorene compound in the product mixture, and (c) separating the product mixture into crystallized di(aminoaryl)fluorene compound and a filtrate.

The utility model relates to the field of chemical production, and provides a high-purity tetramethyl hexamethylenediamine preparation system. Comprising a reaction unit and a rectification unit, the reaction unit comprises an autoclave, a stirring device is installed in the autoclave, a hydrogen feeding distributor is installed at the tail end of the bottom of a stirring shaft, the hydrogen feeding distributor comprises a distribution plate and a plurality of distribution pipes installed on the distribution plate, and the distribution pipes are communicated with an inner cavity of the distribution plate. And the center of the bottom of the distribution plate is communicated with the extension pipeline corresponding to the gas inlet through a rotary joint. Through the structural design of the hydrogen feeding distributor, it is ensured that hydrogen can uniformly enter the bottom of the high-pressure kettle from the inside of the hydrogen feeding distributor, so that the hydrogen can be in full contact with and react with materials in the high-pressure kettle in the rising process; the reacted mixed solution is pressed out from the bottom under the pressure of the autoclave and then sent into a rectification unit for subsequent treatment, and finally the high-purity tetramethyl hexamethylenediamine finished product is obtained after rectification of the rectification unit.

The present invention provides a method for preparing the active pharmaceutical ingredient of fenfluramine. Aspects of the present invention include (a) hydrolyzing a 2-(3-(trifluoromethyl)phenyl)acetonitrile composition to produce a 2-(3-(trifluoromethyl)phenyl)acetic acid composition; (b) reacting the 2-(3-(trifluoromethyl)phenyl)acetic acid composition with acetic anhydride and a catalyst to prepare a 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and (c) reducing and aminating the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition with a borohydride reducing agent and ethylamine to produce a fenfluramine composition. The present invention also provides a composition and a pharmaceutical ingredient comprising a pharmaceutically acceptable salt of fenfluramine prepared according to the method and having less than a total of 0.2% by weight of trifluoromethyl regioisomers.

A method for preparing the insecticide N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide is disclosed. A method for preparing the intermediate N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide is also disclosed.

Disclosed are processes for the preparation of the pesticide N-(1- methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide. Also disclosed are methods for the preparation of intermediates of thereof N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide.

The invention discloses an aromatic amine compound and a preparation method and application thereof.The aromatic amine compound is large in molecular weight, not prone to migration to the surface when used in rubber and other products, good in compatibility with rubber, not prone to blooming, good in anti-aging effect and capable of achieving the same or even better anti-aging effect compared with an existing anti-aging agent product, and the aromatic amine compound has the good anti-aging effect. The product can be used as an industrial anti-aging agent and a plasticizer.

The present invention relates to a process for the preparation of hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.

A process for the manufacture of ethyleneamines and ethanolamines, comprising the steps of (i) converting a glycolaldehyde derivative of formula (II), in which R2, R3 are—the same or different—hydrogen, alkyl, such as C1-6-alkyl, or cycloalkyl such as Cs-e-cycloalkyl; and an animating agent of formula (III); in which R1 is hydrogen (H), alkyl, such as C1-6-alkyl, or cycloalkyl such as C3-6-cycloalkyl, in the gas or liquid phase; (ii) feeding the reaction products obtained in step (i) into a hydrogenation reactor, where the reaction products are converted with hydrogen in the presence of a hydrogenation catalyst.

The application discloses a supported nanomaterial, a preparation method thereof, and a method for synthesizing 6PPD by using the supported nanomaterial as a catalyst. The preparation method of the supported nanomaterial comprises the following steps: obtaining a mixture containing a nitrogen source, a carbon source and a noble metal source; and performing calcination I, calcination II and acid pickling on the mixture to obtain the supported nanomaterial; the atmosphere of the calcination I and the calcination II is nitrogen; the conditions of the calcination I comprise that the temperature is 555 DEG C to 855 DEG C, and the time is 2h to 6h; the conditions of the calcination II comprise that the temperature is 955 DEG C to 1155 DEG C, and the time is 2h to 4h. The noble metal element is modified on the nitrogen-doped carbon nanosheet by a pyrolysis one-step method. The supported nanomaterial is used as the catalyst for producing 6PPD, and the copper damage problem in the industrial production can be solved, and the ketone to alcohol side reaction phenomenon can be reduced. The catalyst has high activity and high selectivity in the catalytic hydrogenation for preparing 6PPD, and has a good application prospect.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a selective controllable synthesis method of two alkyl arylamine compounds. The synthesis method comprises the following steps: S1, mixing nitro-aromatic hydrocarbon with aryl aldehyde / ketone or alkyl aldehyde / ketone, and then adding copper salt, nested carborane and an organic solvent to obtain a mixture; s2, irradiating the mixture with blue light at 25-80 DEG C under the protection of inert gas to obtain a product; s3, after the reaction is finished, separating and purifying a product to obtain an N-monoalkyl arylamine compound or an N-dialkyl arylamine compound; the feeding molar ratio of the nitro-aromatic hydrocarbon to the aryl aldehyde / ketone or alkyl aldehyde / ketone to the copper salt to the nested carborane is 10: (12-24): 1: 5; the molar concentration of the nitro-aromatic hydrocarbon in the organic solvent is 0.25 M.

The present invention relates to a preparation method for a new multi-channel Co@CM ceramic catalytic membrane, which belongs to the technical field of catalytic membrane preparation. In the preparation of the catalytic membrane, a multi-channel ceramic membrane is used as a carrier, ZIF-67 is assembled and loaded layer by layer on the surface of the ceramic membrane and inside pore channels, and the catalytic membrane is prepared by means of one-step pyrolysis reduction. The method has the advantages that nano Co particles are loaded on the ceramic membrane instead of precious metals, and the surfaces of the Co particles are coated with carbon and nitrogen, thus effectively inhibiting the loss of the Co particles during the reaction; and the resulting Co@CM ceramic membrane has excellent catalytic activity and stability, and the problem of it being difficult to separate a traditional catalyst from a product in a subsequent process is also solved, so it can be widely used in a hydrogenation reaction process.

The present invention relates to a process for making secondary and / or tertiary amines comprising an amination step, said amination step being carried out by gas phase reaction of a primary or secondary alcohol and / or ketone with ammonia or a primary or secondary amine in the presence of a catalyst, said catalyst comprising copper and doped with manganese, the amount of manganese being between 1% and 10% by weight relative to the total weight of the catalyst.

A method for preparing the insecticide N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide is disclosed. A method for preparing the intermediate N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide is also disclosed.

A process for the purification of pentamethyl diethylenetriamine (PMDETA) comprising one or more by-products selected from the group consisting of N,N,N",N"-tetramethyldiethylenetriamine, N,N,N'-trimethyl-N'-[2-(methylamino)ethyl]ethane-1,2-diamine and N,N,3-trimethyl-1-imidazolidineethanamine, comprising the steps: a) providing a crude PMDETA mixture comprising one or more of the by-products; b) adding a compound reactive with the by-products; c) reacting the by-products with the reactive compound to obtain derivatives of the by-products; d) distillative separation of PMDETA from the by-product derivatives obtained in step c) to obtain pure PMDETA.

The invention discloses a method for preparing primary amine chemicals by hydrogenation amination of aldehyde and ketone through a platinum group monatomic doped nickel-based layered hydroxide catalyst, and belongs to the technical field of heterogeneous catalysis preparation of high-quality chemicals. The method comprises the following steps: by taking aldehyde and ketone chemicals as raw materials and ammonia gas as a gas source, carrying out hydrogenation amination reaction in a reaction solvent under the action of a platinum group monatomic doped nickel-based layered hydroxide catalyst and a hydrogen atmosphere to prepare a primary amine chemical; the platinum group single atom is any one of palladium, platinum, ruthenium, iridium or rhodium; wherein the effective active components on the nickel-based layered hydroxide carrier are composed of nickel metal and other metals, and the other metals are one or more of zinc, magnesium, aluminum, cerium, manganese, zirconium, iron, niobium or copper. The primary amine chemical prepared by the method has very high economic value.

The disclosure is directed to cocrystals of fasoracetam, including R-fasoracetam, and various coformers. Crystalline materials comprising fasoracetam, including R-fasoracetam, are also provided. The disclosure further includes pharmaceutical compositions and methods of treatment of the cocrystals and crystalline materials of the disclosure.