Category: 539-88-8

Jorge, Erlen Y. C. published the artcileSulfonated dendritic mesoporous silica nanospheres: a metal-free Lewis acid catalyst for the upgrading of carbohydrates, Formula: C7H12O3, the main research area is sulfonated mesoporous silica nanosphere catalyst support sugar conversion intermediate.

Lignocellulosic biomass is becoming a viable alternative or complementary source for obtaining petroleum-derived products such as fuels, polymers and fine chems., among others. Nevertheless, the successful upgrading of lignocellulosics requires the design of efficient and robust catalysts, where sulfonated mesoporous SiO2 materials may be an ideal choice for exploration. Herein, the authors have conducted the upgrading of several mono-, di- and polysaccharides such as xylose, fructose, glucose, sucrose and cellulose to valuable platform chems. using a novel catalyst comprising sulfonated dendritic mesoporous SiO2 nanospheres. Addnl., a thorough comparative study was conducted encompassing arrays of sulfonated silicas as catalysts with the aim of relating their activities and appreciating the features which could be responsible for their activity.

Green Chemistry published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Tukacs, Jozsef M. published the artcileContinuous flow hydrogenation of methyl and ethyl levulinate: an alternative route to γ-valerolactone production, Quality Control of 539-88-8, the main research area is methyl ethyl levulinate valerolactone continuous flow hydrogenation; flow chemistry; heterogeneous catalysis; hydrogenation; γ-valerolactone.

Heterogeneous continuous transformation of Me levulinate (ML) and Et levulinate (EL) to γ-valerolactone (GVL), as a promising C5-platform mol. was studied at 100°C. It was proved that the H-Cube continuous hydrogenation system equipped with 5% Ru/C CatCart is suitable for the reduction of both levulinate esters. While excellent conversion rates (greater than 99.9%) of ML and EL could be achieved in water and corresponding alcs., the selectivities of GVL were primarily affected by the solvent used. In water, 100% conversion and ca 50% selectivity that represent ca 0.45 molGVL g-1metalh-1 productivity towards GVL, were obtained under 100 bar of total system pressure. The application of alcs. as a solvent, which maintained high conversion rates up to 1 mL min-1 flow rate, resulted in lower productivities (less than 0.2 molGVL g-1metal h-1) of GVL. Therefore, from a synthesis point of view, the corresponding 4- hydroxyvalerate esters could be obtained even at a higher reaction rate. The addition of sulfonated triphenylphosphine ligand (TPPTS) allowed reduction of the system pressure and resulted in the higher selectivity towards GVL.

Royal Society Open Science published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Quality Control of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shende, Vaishali S. published the artcileRoom-Temperature Asymmetric Transfer Hydrogenation of Biomass-Derived Levulinic Acid to Optically Pure γ-Valerolactone Using a Ruthenium Catalyst, COA of Formula: C7H12O3, the main research area is asym transfer hydrogenation biomass levulinic acid valerolactone ruthenium catalyst.

This study presents a first report on ruthenium-catalyzed asym. transfer hydrogenation (ATH) of levulinic acid (LA) to chiral γ-valerolactone (GVL). ATH of LA has been explored with Noyori’s chiral catalyst (Ru-TsDPEN) in methanol solvent. Efficacy of ATH reaction of LA was investigated under different reactions conditions such as temperature, catalyst, and hydrogen donor concentration The effect of various organic tertiary bases along with formic acid (FA) as a hydrogen donor was studied, and N-methylpiperidine with FA (1:1 molar ratio) was revealed as an efficient hydrogen donor for ATH of LA to GVL furnishing chiral GVL with complete conversion and 93% enantiomeric excess (ee). This operationally simple and mild ATH protocol was tested for practical applicability of ATH of LA obtained from biomass waste (rice husk and wheat straw) and furnished chiral GVL with 82% ee.

ACS Omega published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Karnjanakom, Surachai published the artcileDirect conversion of sugar into ethyl levulinate catalyzed by selective heterogeneous acid under co-solvent system, Formula: C7H12O3, the main research area is sugar ethyl levulinate catalyzed acid solvent system.

The direct synthesis of Et levulinate (EL) from sucrose was investigated under co-solvent of THF/ethanol over stable/active heterogeneous acid catalyst. Several Lewis acid-metal oxides were doped onto Bronsted acid-sulfonated carbon (SC) and the results found that Zn-SC exhibited highest activity for production of EL from sucrose conversion of 100% with a selectivity of 72.1%. The catalytic mechanism for conversion of sucrose into EL and other products was investigated through significant effects such as catalyst type, co-solvent and ultrasonic application. The catalyst reusability test exhibited high stability for five cycles and then dramatically decreased without any regeneration process.

Catalysis Communications published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Nikitin, Eugene D. published the artcileCritical temperatures and pressures, heat capacities, and thermal diffusivities of levulinic acid and four n-alkyl levulinates, Synthetic Route of 539-88-8, the main research area is alkyl levulinate levulinic acid critical temperature pressure heat capacity.

The critical temperatures, pressures, heat capacities, and thermal diffusivities of levulinic acid and Me, Et, Pr, and Bu levulinates have been measured. Exptl. critical constants of levulinic acid and alkyl levulinates have been compared with those calculated using the group contribution methods of Wilson/Jasperson, Lydersen, Constantinou/Gani, and Marrero/Gani. The temperature dependencies of heat capacities and thermal diffusivities have been approximated by a third-order and a first-order polynomial, resp. The coefficients of these polynomials have been given. Exptl. heat capacities have been compared with those estimated by the methods of Kolska et al. and Dvorkin et al. Using the exptl. data, the thermal conductivities of alkyl levulinates have been calculated These data have been compared to those calculated by the methods of Latini et al. and Sastri.

Journal of Chemical Thermodynamics published new progress about Biomass. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ji, Ying published the artcileSynthesis of Silico-Phospho-Aluminum Nanosheets by Adding Amino Acid and its Catalysis in the Conversion of Furfuryl Alcohol to Fuel Additives, Safety of Ethyl 4-oxopentanoate, the main research area is silicophospho aluminum furfuryl alc amino acid valorization; amino acids; diethyl ether; ethyl levulinate; furfuryl alcohol; nanosheets.

Self-assembled spheres of silico-phospho-aluminum nanosheets were synthesized with the addition of L-arginine and evaluated as catalysts for the valorization of furfuryl alc. to fuel additives. Adding the amino acid, a bio-derived additive, contributed to higher external sp. surface area and more active sites, featuring a simple, environmentally friendly, and feasible strategy to regulate the growth of nanosheets. Herein, in the reaction of furfuryl alc. with ethanol, the performance of silico-phospho-aluminum nanosheets was significantly improved compared with typical silicon phosphorus aluminum catalyst SAPO-34. The yield of Et levulinate with the use of silico-phospho-aluminum nanosheets was 7.8 times higher than for SAPO-34, and meanwhile the amount of undesirable byproduct di-Et ether was decreased by two orders of magnitude and negligibly produced compared with SAPO-34. Moreover, replacing part of aluminum isopropoxide with aluminum sulfate as aluminum source could introduce sulfate in situ in the process of catalyst synthesis and increase the amount of acid sites on the catalyst.

ChemSusChem published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Safety of Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kumari, P. Krishna published the artcileNiobium exchanged tungstophosphoric acid supported on titania catalysts for selective synthesis of 5-ethoxymethylfurfural from fructose, SDS of cas: 539-88-8, the main research area is ethoxymethylfurfural preparation titania support tungstophosphoric acid catalyst property.

Various niobium contained tungstophosphoric acid (NbTPA) supported on titania catalysts were prepared and investigated their activity for selective synthesis of 5-ethoxymethylfurfural (EMF) from fructose in ethanol/THF solvent system. Physico-chem. properties of the catalysts were assessed by different spectroscopic approaches like X-ray diffraction, Laser Raman, BET-surface area, FT-IR, pyridine adsorbed FT-IR and temperature programmed desorption of ammonia. The results of characterization direct the existence of firm Keggin ion structure of Nb exchanged TPA and its well dispersed state on support. Lewis acidic sites were induced with the existence of Nb ions. The catalytic activity was interrelated to the catalyst acidity which was liable on the number of Nb ions present in TPA and the amount of NbxTPA supported on TiO2. Among all catalysts 20wt% Nb0.4TPA/TiO2 catalyst showed best catalytic performance toward EMF with a yield of 76% at 130°C after 6 h. The catalyst is recyclable without any depletion of activity.

Molecular Catalysis published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dai, Jinhang published the artcileAdjusting the acidity of sulfonated organocatalyst for the one-pot production of 5-ethoxymethylfurfural from fructose, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is sulfonated polymer organocatalyst fructose conversion ethoxymethylfurfural production.

We report a novel solid organocatalyst, a double-hydrogen-bonded sulfonated polymer catalyst (D-SPC), for the cascade conversion of fructose to 5-ethoxymethylfurfural (EMF) with a highest yield of 68.8 mol% and good catalyst recyclability. We demonstrate that the treatment of a sulfonated nitrogen-containing polymer catalyst (SPC) with dihydroxy acetone (DHA) mols. generates new double hydrogen-bonds (H-bonds) between the ring-attached sulfonic acid groups and DHA by deconstructing the existing H-bonds between the sulfonic acid groups and imine/amine nitrogens of the SPC, which is confirmed by FT-IR spectroscopy, elemental anal., 1H MAS and 13C cross-polarization MAS NMR, XPS, and quantum chem. calculations The 31P MAS NMR, pHsurface, and NH3-TPD of the catalysts reveal the weakening of acidity strength due to the stronger double H-bonding on the D-SPC. Notably, we figure out the inverse relationship between the acidity strength of the catalysts and the EMF yield in the one-pot fructose-to-EMF conversion, wherein the use of weaker acid catalysts accelerates the fructose dehydration while decelerating the side-reaction of furan ring opening, therefore avoiding the neg. influence of water on the tandem reactions. Moreover, the existence of stable double H-bonds contributes to the good catalyst recyclability due to the stabilization of sulfonic acid groups. The acidic property of the solid catalysts could be adjusted by varying the DHA dosage and the preparation conditions of the SPC (i.e., monomer ratio and oxidant dosage), resp. We show that the solid acid catalyst with weaker acidity strength and suitable acidity d. (ca. 2.5 mmol g-1) is favorable for the one-pot synthesis of EMF directly from fructose. This work highlights the application of novel sulfonated polymer catalysts with adjustable acidic property for the highly selective production of EMF, a liquid biofuel candidate, from biomass-derived carbohydrates.

Catalysis Science & Technology published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Li, Wenke published the artcileHf-based metal organic frameworks as bifunctional catalysts for the one-pot conversion of furfural to γ-valerolactone, Computed Properties of 539-88-8, the main research area is hafnium metal organic framework bifunctional catalyst furfural valerolactone.

One-pot conversion of furfural to the target product γ-valerolactone (GVL) is a challenging and meaningful part of biomass exploitation. Development of heterogeneous catalysts with both Bronsted and Lewis acid properties has proved to be promising and useful because they offer an efficient way to tandem cascade reactions from furfural to GVL. Herein, we successfully synthesized sulfated DUT-67(Hf), a novel bifunctional catalyst, via a post-synthetic modification method. The prepared sulfated DUT-67(Hf) was characterized by XRD, SEM, TEM, N2 adsorption-desorption, Elemental (N, C, H, S) analyses, situ IR spectra of pyridine adsorptions, XPS, FT-IR, TG, and NH3-TPD. The acidity of the catalysts could be adjusted by submersion in different concentrations of aqueous sulfuric acid, giving 0.01 mol/L sulfuric acid for 0.42 mmol/g acidity to 0.1 mol/L sulfuric acid for 2.16 mmol/g acidity. Sulfated DUT-67(Hf) possessed by 0.06 mol/L aqueous sulfuric acid exhibited optimal catalytic activity and showed an 87.1% yield of GVL under the conditions of 180 °C after 24 h of reaction. Moreover, the mechanism of introducing Bronsted acid sites into DUT-67(Hf) and the better hydrogen donors was also investigated through contrasting experiments

Molecular Catalysis published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Computed Properties of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Feng, Junfeng published the artcileCollaborative Conversion of Biomass Carbohydrates into Valuable Chemicals: Catalytic Strategy and Mechanism Research, Name: Ethyl 4-oxopentanoate, the main research area is biomass carbohydrate valuable chem catalytic strategy mechanism; collaborative conversion; levulinates; lignocellulose; zeolite.

Levulinate is one of the high added-value biomass-derived chems. that is primarily produced from hexoses in cellulose and hemicellulose. Producing levulinate from pentoses in hemicellulose that is extensively distributed in biomass is still highly challenging. In this study, biomass materials and carbohydrates (including cellulose, xylan, glucose, fructose, and xylose) were collaboratively converted into levulinates efficiently over various zeolites with ethanol/dimethoxymethane as cosolvents. The key process for converting pentoses into levulinates is the synthesis of intermediates (furfural) into alkoxy Me furfural via electrophilic substitution or their conversion into furfuryl alc. via in situ hydrogenation. The substitution was achieved by the synergic effect between bifunctional catalysts and cosolvents, which promotes conversion of furfural into alkoxy Me furfural via the electrophilic addition of alkoxy Me radicals. Hydrogenation of furfural into furfuryl alc. was impelled by the cooperative process between in situ generated H-donor from alc. solvents and zeolite catalysts. Moreover, a favorable yield of 21.05 mol % of levulinates was achieved by simultaneous and collaborative conversion of cellulose and hemicellulose with the one-pot process using ethanol/dimethoxymethane as a cosolvent and the zeolite with B and L acid sites as a catalyst.

Journal of Agricultural and Food Chemistry published new progress about Bagasse. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Name: Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics