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In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 497-25-6, name is Oxazolidin-2-one, introducing its new discovery. category: oxazolidine

Asymmetric beta-boration of alpha,beta-unsaturated N -acyloxazolidinones by [2.2]paracyclophane-based bifunctional catalyst

An efficient copper-catalyzed asymmetric conjugate boration has been achieved by exploiting a new planar and central chiral bicyclic triazolium ligand. This protocol was highly efficient and gave a variety of chiral secondary alkylboronates in 97-99% ee. A preliminary mechanistic study supports the bifunctional nature of the catalyst.

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Oxazolidine | C3H1205NO – PubChem

 

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497-25-6, Name is Oxazolidin-2-one, belongs to oxazolidine compound, is a common compound. COA of Formula: C3H5NO2In an article, once mentioned the new application about 497-25-6.

Flexible aliphatic poly(isocyanurate-oxazolidone) resins based on poly(ethylene glycol) diglycidyl ether and 4,4?-methylene dicyclohexyl diisocyanate

New flexible aliphatic oxazolidone-isocyanurate networks (AISOX) are obtained by reacting a low molecular weight diisocyanate (4,4?-methylene dicyclohexyl diisocyanate, H12MDI) and a macro-diepoxyde (poly(ethylene glycol) diglycidyl ether, Mn = 526, PEGDGE) in different molar ratio. The curing reaction, carried out from 25 C to 200 C, is studied by using DSC and FTIR. The effect of the molar ratio of the two monomers on thermal and mechanical properties of AISOX resins is investigated by DSC, thermogravimetric analysis, stress-strain measurements and optical microscopy. Independently from the feed composition, it is observed that the reaction steps are: (i) partial hydrolysis of isocyanate caused by water traces, (ii) incomplete trimerization of isocyanate to give isocyanurate, and (iii) formation of oxazolidone and complete conversion of isocyanate. At the highest concentration of the soft macrodiepoxyde (PEGDGE), the AISOX resin is in the rubbery state at room temperature and shows an elastomeric behavior.

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Synthesis and X-ray structure of a C5-C4-linked glucofuranose-oxazolidin-2- one

The formation of (4R)-4-carbamoyl-4-[(4R)-3-O-benzyl-1,2-O-isopropylidene- beta-L-threofuranos-4-C-yl]- oxazolidin-2-one instead of expected imidazolidin-2,4-dione (hydantoin) derivative from 5-amino- 5-cyano-5-deoxy-3-O- benzyl-1,2-O-isopropylidene-alpha-D-glucofuranose or 3-O-benzyl-1,2-O- isopropyli-dene- alpha-D-xylo-hexofuranos-5-ulose under Bucherer-Bergs reaction conditions is reported. Single crystal X-ray diffraction data revealed that 3T4 is the prefered conformation for the furanose ring, while E2 and 2T1 conformations are adopted by the 1,3-dioxolane and 2-oxazolidinone five-membered rings, respectively.

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Reference of 497-25-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.497-25-6, Name is Oxazolidin-2-one, molecular formula is C3H5NO2. In a Patent£¬once mentioned of 497-25-6

A and tin ycin A fully synthetic method (by machine translation)

The invention relates to a and tin ycin A fully synthetic method, the method consists in the compound (S)- 3 – ((S)- 1 – amino – 3 – methyl-butyl) – 8 – hydroxy isoflavone chroman – 1 – one with compound (2S, 3S, 4S) – 2 – amino – 4 – (benzyloxycarbonyl amino) – 6 – (uncle butoxy) – 3 – ((tert-butyl dimethyl) oxy) – 6 – oxo caproic acid by condensation reaction to obtain the key intermediate (3S, 4S, 5S) – 5 – azido – 3 – (benzyloxycarbonyl amino) – 4 – hydroxy – 6 – ((1 – (8 – hydroxy – 1 – isoindole chroman – 3 – yl) – 3 – methyl-butyl) amino) – 6 – butyl oxo caproic acid uncle; and then sequentially through the hydrogenation reduction, the cyclization reaction, takes off uncle butyl dimethyl silicon ether reaction, hydrolysis reaction to obtain ohwada ycin A. The method of the invention with the raw materials are easy, simple operation, low cost and the like, the resulting product ohwada cephalosporin A has broad spectrum bacterial inhibiting activity and anti-tumor activity. (by machine translation)

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Application of 497-25-6, Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 497-25-6, molcular formula is C3H5NO2, introducing its new discovery.

Integrated CO2 capture-fixation chemistry via interfacial ionic liquid catalyst in laminar gas/liquid flow

Simultaneous capture of carbon dioxide (CO2) and its utilization with subsequent work-up would significantly enhance the competitiveness of CO2-based sustainable chemistry over petroleum-based chemistry. Here we report an interfacial catalytic reaction platform for an integrated autonomous process of simultaneously capturing/fixing CO2 in gas-liquid laminar flow with subsequently providing a work-up step. The continuous-flow microreactor has built-in silicon nanowires (SiNWs) with immobilized ionic liquid catalysts on tips of cone-shaped nanowire bundles. Because of the superamphiphobic SiNWs, a stable gas-liquid interface maintains between liquid flow of organoamines in upper part and gas flow of CO2 in bottom part of channel. The intimate and direct contact of the binary reagents leads to enhanced mass transfer and facilitating reactions. The autonomous integrated platform produces and isolates 2-oxazolidinones and quinazolines-2,4(1H,3H)-diones with 81-97% yields under mild conditions. The platform would enable direct CO2 utilization to produce high-valued specialty chemicals from flue gases without pre-separation and work-up steps.

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Oxazolidine | C3H1101NO – PubChem

 

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497-25-6, Name is Oxazolidin-2-one, belongs to oxazolidine compound, is a common compound. SDS of cas: 497-25-6In an article, once mentioned the new application about 497-25-6.

Highly stereocontrolled synthesis of the 1beta-methylcarbapenem key intermediate by the Reformatsky reaction of 3-(2-bromopropionyl)-2-oxazolidone derivatives with a 4-acetoxy-2-azetidinone

The key synthetic intermediate (4) of 1beta-methylcarbapenems (1~3) was efficiently synthesized by employing highly stereocontrolled Reformatsky reaction (C4-alkylation) of 3-(2-bromopropionyl)-2-oxazolidone derivatives (6) with (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidino ne (5) in the presence of zinc dust followed by removal of 2-oxazolidone moieties. The best diastereoselectivity (beta:alpha = 95:5) could be realized by uses of sterically crowded achiral 2-oxazolidone derivatives such as 4,4-dimethyl-, 4,4,5,5-tetramethyl, and 4,4-dibutyl-5,5-pentamethylene-2-oxazolidone and higher reaction temperatures (refluxing tetrahydrofran). The remarkable diastereoselectivities observed for the Reformatsky reactions could be explained by means of the weakly chelating transition state models.

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Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Related Products of 497-25-6. In my other articles, you can also check out more blogs about 497-25-6

Related Products of 497-25-6, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 497-25-6, Oxazolidin-2-one, introducing its new discovery.

A convenient antibiotic indicator in the ozone treatment of wastewaters. An experimental and theoretical study

N-Acetyl-oxazolidin-2-one has been found to be a convenient indicator in the removal of nitroimidazole-type antibiotic contaminants in wastewaters by ozone since it is the unique product generated in the treatment of waters containing metronidazole, and it is stable against further ozonation in the experimental conditions used. The oxidative conditions imposed by the reaction do not allow isolation of any by-products, nor other stable subproducts. High-performance liquid chromatography coupled with electrospray ionization-time-of-flight mass spectrometry (HPLC-ESI-TOF(MS)) revealed the presence of simple derivatives of both metronidazole and N-acetyl-oxazolidin-2- one, thus indicating that both products are unambiguously connected and that, possibly, a unique reaction pathway would take place in this case. A feasible mechanism for this transformation has then been postulated, which is supported by several experimental findings such as TOC analysis and nitrate titration, both correlating well with the proposed transformation. Furthermore, this mechanism has been evaluated by DFT/B3LYP calculations, showing that the observed product is readily obtained thanks to the high exothermicity displayed by the metronidazole ozonation process.

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Oxazolidine – Wikipedia,
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MnFe2O4 magnetic nanoparticles modified with chitosan polymeric and phosphotungstic acid as a novel and highly effective green nanocatalyst for regio- and stereoselective synthesis of functionalized oxazolidin-2-ones

A novel magnetically recoverable acid nanocatalyst, MnFe2O4/chitosan/phosphotungstic acid (MnFe2O4@CS@PTA), was successfully synthesized. The synthesized nanoparticle was studied as the heterogenous nanocatalyst to prepare the functionalized oxazolidin-2-ones as versatile chiral synthons in asymmetrically synthesizing the compounds with biological activity through the reaction of alpha-epoxyketones with urea and thiourea. This new procedure has notable advantages such as excellent yields, green reaction conditions, and short reaction time. In addition, the excellent catalytic performance in protic solvent and the easy preparation, thermal stability and separation of the catalyst make it a good heterogeneous system and a useful alternative to other heterogeneous catalysts. Perhaps, the synthesized MnFe2O4@CS@PTA is a hopeful catalytic substance for mass fine chemicals production. The structure and composition of the nanocomposite was performed by different methods and analyzed by Infrared Spectroscopy (FT-IR), Field Emission Scanning Electron Microscopy (FE-SEM), Thermo-Gravimetric Analysis (TGA), X-ray Diffraction (XRD) Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM) and Brunauere Emmette Teller (BET).

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Enantioselective multicomponent synthesis of fused 6-5 bicyclic 2-butenolides by a cascade heterobicyclisation process

The successive coupling of an alkoxy(aryl/heteroaryl)carbene complex of chromium with either a ketone or an imide lithium enolate and then a 3-substituted (H, TMS, PhCH2, PhCH2CH2, Me) propargylic organomagnesium reagent has afforded novel hydroxy-substituted bicyclic [4.3.0]-gamma-alkylidene-2-butenolides with three modular points that has allowed the efficient introduction of molecular complexity, including a homopropargylic alcohol core. The selective formation of these five- or six-component heterobicyclisation products is the result of the regioselective integration of the Grignard reagent as a propargyl fragment followed by a cascade CO/alkyne/CO insertion, ketene trapping and elimination sequence. By using lithium enolates of chiral N-acetyl-2-oxazolidinones and the corresponding propargylic organocerium reagents, both enantiomers of these bicyclic heterocycles were efficiently prepared with very high enantiomeric purity. Architecturally, these fused bicyclic butenolides are characterised by a highly unsaturated and oxygenated core and they exhibit strong blue fluorescence in solution.

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Copper-catalyzed alkynylation of amides with potassium alkynyltrifluoroborates: A room-temperature, base-free synthesis of ynamides

(Figure Presented) An efficient copper-mediated method for the coupling of potassium alkynyltrifluoroborates with nitrogen nucleophiles is reported. This reaction provides the first base-free and room-temperature synthesis of ynamides and allows for an easy preparation of these useful building blocks.

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