Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

49 results about "Nitronate" patented technology

A nitronate (IUPAC: azinate) in organic chemistry is a functional group with the general structure R¹R²C=NO⁻ ₂. It is the anion of a nitronic acid, a tautomeric form of a nitro compound. Just as ketones and aldehydes exist in equilibrium with their enol tautomer in basic and acidic conditions, nitro compounds exist in equilibrium under basic conditions with their nitronate tautomer. The base deprotonates the α carbon, or the carbon directly attached to the nitrogen. The nitronate has two different resonance structures, one with a negative charge on the α carbon and a double bond between the nitrogen and one of the oxygens, and another resonance structure with a double bond between the nitrogen and the α carbon, and no double bond between the nitrogen and the oxygens. A nitronic acid is also called an aci form. In the Nef reaction nitronic acids are degraded to ketones. They can be alkylated on oxygen and used as a dipole in 1,3-dipolar cycloadditions.

Process for transition metal free catalytic aerobic oxidation of alcohols under mild conditions using stable free nitroxyl radicals

An alcohol can be oxidized by a process in which a primary or secondary alcohol are reacted with an oxygen-containing gas in the presence of a catalyst composition containing (i) a stable free nitroxyl radical derivative, (ii) a nitrate source, (iii) a bromide source, and (iiii) a carboxylic acid, thereby obtaining an aldehyde or a ketone.
Owner:EVONIK DEGUSSA GMBH

Double-hole carrier iron/ copper low-carbon alcohol synthesis catalyst and preparation method thereof

The invention provides a double-hole carrier iron/copper low-carbon alcohol synthesis catalyst with high activity and C<2+> alcohol selectivity, and a preparation method of the double-hole carrier iron/copper low-carbon alcohol synthesis catalyst. The double-hole carrier iron/copper low-carbon alcohol synthesis catalyst comprises Cu, Fe, K and M by weight percentage: 10-40% of Cu, 1-10% of Fe, 0.5-10% of K and 40-80% of M, wherein M is a double-hole carrier prepared from macroporous silica gel and ostiole colloidal silica. The preparation method comprises the steps of: dipping the ostiole colloidal silica in the macroporous silica gel in an isopyknic way, and preparing the double-hole carrier; then, dissolving metal in distilled water in a form of nitrate, and forming a mixed solution; and dipping the double-hole carrier in the mixed solution in an isopyknic way, and preparing the catalyst. The double-hole carrier iron/copper low-carbon alcohol synthesis catalyst prepared by the invention can be applied to the reaction for preparing low-carbon alcohol by synthesis gas, is simple in preparation technology, easy to operate, high in strength of the prepared catalyst and good in stability, and has high activity and C<2+> alcohol selectivity.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

Organic amine dimmer and method for synthesizing the same

An organic amine dimmer and a method for synthesizing the same are disclosed. The method comprises the following steps: (A) mixing an iron-containing compound (e.g., Fe2O3, FeCl3), a nitrate-containing compound, oxalate acid, 4,4′-trimethylenedipiperidine (TMDP), H3PO4, and 2 to 8 ml of water to form a mixture; (B) heating the mixture and maintaining the mixture at 160° C. or above for a first predetermined time; (C) cooling the mixture; and (D) placing the mixture at room temperature for a second predetermined time, to obtain an organic amine dimmer, wherein Fe(NO3)3 can serve as the iron-containing compound as well as the nitrate-containing compound.
Owner:NATIONAL TSING HUA UNIVERSITY

Nitrogen-carbon doped cobalt-based bimetallic catalyst, preparation method thereof and preparation method of 2, 5-dimethyl furandicarboxylate

The invention provides a nitrogen-carbon doped cobalt-based bimetallic catalyst and a preparation method thereof. The preparation method comprises the following steps of mixing: mixing a nitrogen source compound, cobalt nitrate, a second metal element nitrate and a carbon source compound, stirring at 90-120 DEG C for more than 8 hours, filtering and drying to obtain a solid compound containing Co, a second metal element, N and C elements, and calcining: calcining the solid compound under a nitrogen condition to obtain the composite catalyst containing Co, a second metal element, N and C elements. The invention also provides a preparation method of 2, 5-dimethyl furandicarboxylate, which comprises the following steps: mixing 5-hydroxymethylfurfural, methanol and the nitrogen-carbon doped cobalt-based bimetallic catalyst, and reacting for 3-5 hours in an oxygen environment under the conditions of pressure of 0.1-0.5 MPa, temperature of 70-90 DEG C and stirring to obtain 2, 5-dimethyl furandicarboxylate. The catalyst is simple in preparation method and suitable for industrial production, and the yield of 2, 5-dimethyl furandicarboxylate can reach 96%. Under the condition that the concentration of HMF is 10 wt%, the yield of 2, 5-dimethyl furandicarboxylate is 92%.
Owner:莆田达凯新材料有限公司

(3R, 4R)-trans-3, 4-diarylchroman derivatives and a method for the prevention and/or treatment of estrogen dependent diseases

The present invention relates to compounds of the formula I in which substituents R2 and R3 are arranged in trans-configuration:wherein:R1 is H or C1-C6 alkyl; C3-C7 cycloalkyl;R2 is phenyl, optionally substituted with 1 to 5 substituents independently selected from the group comprising OH, C1-C6-alkyl, halogen, nitro, cyano, SH, SR4, trihalo-C1-C6-alkyl, C1-C6-alkoxy and phenyl, wherein R4 is C1-C6 alkyl;R3 is phenyl substituted with OR5 wherein R5 has the formula (II), (III) or (IV)wherein Y is chosen from NHR4, NR42, NHCOR4, NHSO2R4, CONHR4, CONR4, CONR42, COOH, COOR4, SO2R4, SOR4, SONHR4, SONR42, a C3-C7 heterocyclic ring, saturated or unsaturated, containing one or two heteroatoms independently selected from the group consisting of O, S and N, optionally being substituted with 1 to 3 substituents independently selected from the group comprising H, OH, halogen, nitro, cyano, SH, SR4, trihalo-C1-C6-alkyl, C1-C6-alkyl and C1-C6-alkoxy, preferably NHR4, NR24, or a nitrogen heterocycle, wherein R4 is as defined above, and the esters, ethers, and salts of the compounds of formula I, optionally along pharmaceutically acceptable excipients, a process for the preparation of the same, and a method of preventing and / or treating estrogen-related disease conditions in a subject using compounds of formula 1, or its salts, optionally along with pharmaceutically acceptable excipients.
Owner:COUNCIL OF SCI & IND RES

Catalyst for producing olefins by catalytic cracking and its preparation method and application

The invention discloses a catalyst for preparing alkene through catalytic cracking. The catalyst takes an alkaline-earth-metal-modified MFI molecular sieve as a carrier and heteropoly acid as an active component, wherein in the alkaline-earth-metal-modified MFI molecular sieve, the weight of alkaline earth metal is 0.5-2.5% of that of an MFI molecular sieve, and the weight of the active component is 0.2-4% of that of the carrier. An alkali metal oxide or alkali metal salt is used to modify the catalyst, and the mass of the alkali metal oxide or alkali metal salt is 0.1-4% of that of the catalyst. A preparation method of the catalyst comprises: soaking the molecular sieve with a nitrate solution of alkaline earth metal, drying the soaked material and performing calcination; loading the modified molecular sieve with the active component through adoption of a heteropoly acid aqueous solution, and drying the soaked material; mashing the obtained material, a proper amount of water and a binder, and performing mixing kneading, molding, drying and calcination; and modifying the obtained material with alkali metal oxide or alkali metal salt, drying the modified product, and performing calcination to obtain the final catalyst. The catalyst is high in alkene yield, low in reaction temperature, and good in stability.
Owner:CHINA PETROLEUM & CHEM CORP +1
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products