Chemistry Milestones Of 591-12-8

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Reference of 5-Methylfuran-2(3H)-one. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Hydrogenation of levulinic acid to valeric acid over platinum-tungsten catalysts supported on γ-Al2O3. Author is Bhanuchander, Ponnala; Samudrala, Shanthi Priya; Putrakumar, Balla; Vijayanand, Perupogu; Kumar, Beepala Sateesh; Chary, Komandur V. R..

To address the challenges associated with fossil fuel depletion, exploration of the sustainable energy resources is one of the most pursued research areas in this century. Valeric acid (VA) is considered as a valuable platform mol. for the production of biofuels and chem. intermediates. However, the production of VA from levulinic acid (LA) has become one of the most desirable reactions. The aim of this work was to investigate the amount of acidity, Pt loading and exptl. conditions for the hydrogenation of LA into VA operated at 0.1 MPa H2 pressure and to elucidate the relationship between the active sites and the catalytic performance. The Pt-WO3 catalysts supported on γ-Al2O3 were synthesized by a simple wet impregnation method with various Pt loadings from 0.5 to 3 wt% with constant 10 wt% of WO3 and calcination at 500 °C for 4 h under air. The catalysts were characterized by powder X-ray diffraction (XRD), SEM-energy dispersive X-ray spectroscopy (SEM-EDS), N2 adsorption-desorption, temperature programmed desorption of ammonia (NH3-TPD), pyridine Fourier transform IR spectroscopy (Pyr.FT-IR) and CO-chemisorption studies. Under optimized reaction conditions, the 2Pt-10WO3/γ-Al2O3 catalyst exhibited the highest selectivity to VA (58%) with 91% conversion of LA. This is due to the availability of a huge number of acidic and Pt active sites on the catalyst surface. In addition, the catalytic activity, reaction parameters and stability of the catalyst are demonstrated clearly.

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The origin of a common compound about 591-12-8

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Methylfuran-2(3H)-one(SMILESS: O=C1OC(C)=CC1,cas:591-12-8) is researched.SDS of cas: 148-51-6. The article 《Furfural hydrogenation, hydrodeoxygenation and etherification over MoO2 and MoO3: A combined experimental and theoretical study》 in relation to this compound, is published in Applied Surface Science. Let’s take a look at the latest research on this compound (cas:591-12-8).

Valorization of lignocellulosic biomass, particularly catalytic hydrotreatment of hemicellulose-based furfural (FUR), has been studied for the production of value-added chems. A three-phase batch reactor has been used for hydrotreatment in isopropanol over various com. available unsupported MoOx catalysts, at various temperatures (170-230°C), pressures (0-80 bar H2), catalyst loadings (0-2 weight%), and reactant concentrations (5-20 weight%). No significant difference in catalytic activity or selectivity has been observed among the three different MoO3 and one MoO2 catalysts, while NiMo/Al2O3, Mo2C and WO3 were much less active. Data-points collected have been used to propose a detailed reaction pathway network for a micro-kinetic model, which also took into consideration the thermodn., and adsorption, desorption, and surface reaction kinetics. The alcoholysis of FUR yielded valuable iso-Pr levulinate (IPL) as the major product under all tested reaction conditions, while other value-added compounds (furfuryl alc., iso-Pr furfuryl ether, furfuryl acetone, angelica lactone) were observed in smaller quantities. It was found that neither the presence nor the absence of the gaseous H2 pressure contributes to the global reaction rate, or selectivity, since the solvent acts as a sufficient hydrogen donor. Addnl., d. functional theory (DFT) calculations provided further insight into the active planes present by the implementation of the Wulff construction. Furthermore, the reaction mechanism was explained based on reaction energies, which were in silico determined and compared for several surfaces. The results were consistent with the characterization and activity-testing results. The furfural ring-opening reaction, yielding valuable IPL in the absence of gaseous H2, over a cheap bulk MoOx is reported for the first time.

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The Best Chemistry compound: 148-51-6

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride( cas:148-51-6 ) is researched.SDS of cas: 148-51-6.Shtyrlin, N. V.; Vafina, R. M.; Pugachev, M. V.; Khaziev, R. M.; Nikitina, E. V.; Zeldi, M. I.; Iksanova, A. G.; Shtyrlin, Yu. G. published the article 《Synthesis and biological activity of quaternary phosphonium salts based on 3-hydroxypyridine and 4-deoxypyridoxine》 about this compound( cas:148-51-6 ) in Russian Chemical Bulletin. Keywords: hydroxypyridine quaternary phosphonium salt preparation antibacterial antitumor activity; deoxypyridoxine quaternary phosphonium salt preparation antibacterial antitumor activity. Let’s learn more about this compound (cas:148-51-6).

Methods for the synthesis of quaternary phosphonium salts based on 3-hydroxypyridine, e.g., I (HCl salt), and 4-deoxypyridoxine were developed. Some of obtained compounds possess high antibacterial and antitumor activity in vitro.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Methylfuran-2(3H)-one(SMILESS: O=C1OC(C)=CC1,cas:591-12-8) is researched.Reference of 5-Methylfuran-2(3H)-one. The article 《Scalable synthesis and polymerization of a β-angelica lactone derived monomer》 in relation to this compound, is published in Green Chemistry. Let’s take a look at the latest research on this compound (cas:591-12-8).

Bio-based levulinic acid is easily ring-closed to α-angelica lactone (α-AL). The α-AL can be isomerized to the conjugated β-AL under the influence of base, but since this is an equilibrium mixture it is very hard to devise a scalable process that would give pure β-AL. This problem was circumvented by distilling the equilibrium mixture to obtain a 90 : 10 mixture of β- and α-AL in 88% yield. This mixture was used for Diels-Alder reactions on 3 terpenes and on cyclopentadiene in up to 100 g scale. The latter DA adduct was subjected to a ROMP reaction catalyzed by the Grubbs II catalyst. The resulting polymer has some similarities to poly-norbornene but is more polar. The polymer can be processed into films with very good transparency.

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Reference of 5-Methylfuran-2(3H)-one. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Efficient formation of γ-valerolactone in the vapor-phase hydrogenation of levulinic acid over Cu-Co/alumina catalyst. Author is Yanase, Daichi; Yoshida, Rei; Kanazawa, Shuhei; Yamada, Yasuhiro; Sato, Satoshi.

Vapor-phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was investigated over Al2O3-supported bimetallic Cu-Co catalysts with different Cu/Co weight ratios under ambient H2 pressure. The bimetallic Cu-Co/Al2O3 catalyst with a Cu/Co weight ratio of 8/12 exhibits an excellent catalytic activity and stability: it showed a high GVL productivity of 5.46 kg kg-1cat. h-1 with a GVL selectivity higher than 99% at 250°C for 24 h. In the characterization of the catalysts, powder X-ray diffraction suggests that bimetallic Cu-Co particles on the Cu-Co/Al2O3 catalysts are composed of an alloy.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 5-Methylfuran-2(3H)-one(SMILESS: O=C1OC(C)=CC1,cas:591-12-8) is researched.COA of Formula: C5H14Cl2N2. The article 《Direct Enantio- and Diastereoselective Vinylogous Addition of Butenolides to Chromones Catalyzed by Zn-ProPhenol》 in relation to this compound, is published in Journal of the American Chemical Society. Let’s take a look at the latest research on this compound (cas:591-12-8).

We report the first enantio- and diastereoselective 1,4-addition of butenolides to chromones. Both α,β- and β,γ-butenolide nucleophiles are compatible with the Zn-ProPhenol catalyst, and preactivation as the siloxyfurans is not required. The scope of electrophiles includes a variety of substituted chromones, as well as a thiochromone and a quinolone, and the resulting vinylogous addition products, e.g. I, are generated in good yield (31 to 98%), diastereo- (3:1 to >30:1), and enantioselectivity (90:10 to 99:1 er). These Michael adducts allow rapid access to several natural product analogs, and can be easily transformed into a variety of other interesting scaffolds as well.

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COA of Formula: C5H14Cl2N2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Piperidin-4-amine dihydrochloride, is researched, Molecular C5H14Cl2N2, CAS is 35621-01-3, about Efficient and Scalable Method for the Selective Alkylation and Acylation of Secondary Amines in the Presence of Primary Amines. Author is Laduron, Frederic; Tamborowski, Vanessa; Moens, Luc; Horvath, Andras; De Smaele, Dirk; Leurs, Stef.

Selective substitution of secondary amines in the presence of primary amines is performed by using the reaction solvent, Me isobutylketone (MIBK), as a temporary protecting group for the primary amine. After acylation or alkylation of the secondary amine, the resulting imine intermediate is smoothly hydrolyzed, leading to the free primary amine in high yield and purity. This procedure represents a cheap and scalable alternative to multistep methods requiring several protections and deprotections.

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Application In Synthesis of 5-Methylfuran-2(3H)-one. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Stereoconvergent Conjugate Addition of Arylboronic Acids to α-Angelica Lactone Derivatives: Synthesis of Stereochemically Complex γ-Butyrolactones. Author is Griswold, Jessica A.; Johnson, Jeffrey S..

Catalyzed stereoconvergent 1,4-additions to unsaturated carbonyls are rare but of high potential value. This letter details the development of enantioselective arylation reactions of boronic acids and β,γ-butenolides. These reactions are catalyzed by com. available hydroxy[(S)-BINAP]-rhodium(I) dimer to afford stereochem. complex γ-butyrolactone derivatives The reaction products provide functionality amenable to further manipulation and can lead to products with up to three contiguous stereocenters. The reaction proceeds under a dynamic kinetic resolution manifold by isomerizing the achiral starting material into an interconverting mixture of enantiomeric conjugate acceptors, followed by catalyst-controlled, enantiomer-selective 1,4-additionBase-promoted racemization of the intermediate α,β-butenolide is possible due to the high kinetic and thermodn. acidity of the γ-proton.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 591-12-8, is researched, Molecular C5H6O2, about Transfer Hydrogenation of Methyl and Ethyl Levulinate Promoted by a ZrO2 Catalyst: Comparison of Batch vs. Continuous Gas-Flow Conditions, the main research direction is transfer hydrogenation methyl ethyl levulinate Zirconia catalyst.Synthetic Route of C5H6O2.

The catalytic conversion of Me and Et levulinates into γ-valerolactone (GVL) by using methanol, ethanol, and 2-propanol as the H-donor/solvent, promoted by the ZrO2 catalyst, is described as carried out under both batch and gas-flow conditions. Under batch conditions, 2-propanol was found to be the best H-donor mol., with Et levulinate giving the highest yield in GVL. The reactions occurring under continuous gas-flow conditions were found to be much more efficient, also showing excellent yields in GVL when EtOH was used as the reducing agent. These experiments clearly show that the ability to release hydrogen from the alc. H-donor/solvent is the main factor driving CTH processes, while the tendency to attack the esteric group is the key step in the formation of transesterification products.

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