Esters-buliding-blocks

Hamdi, Jumanah published the artcileHalloysite-Catalyzed Esterification of Bio-Mass Derived Acids, Name: Ethyl 4-oxopentanoate, the main research area is halloysite catalyzed esterification bio acid.

Halloysite, a natural clay with a hollow tubular structure, was studied as a catalyst for the esterification of biomass-derived carboxylic acids (levulinic acid, fumaric acid, maleic acid, and succinic acid) with four different alcs. (MeOH, EtOH, n-PrOH, and n-BuOH). Reaction conditions were optimized (10 mol % halloysite, 170 °C, 24 h) and gave high yields of the corresponding esters and diesters (>90%). The halloysite was easily recovered and recycled after washing and drying.

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, Name: Ethyl 4-oxopentanoate.

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

Song, Jinliang published the artcileStrong Oxophilicity of Zr Species in Zr4+-Exchanged Montmorillonite Boosted Meerwein-Ponndorf-Verley Reduction of Renewable Carbonyl Compounds, Safety of Ethyl 4-oxopentanoate, the main research area is oxophilicity zirconium species exchanged montmorillonite Meerwein Ponndorf Verley reduction.

Meerwein-Ponndorf-Verley (MPV) reduction of biomass-derived carbonyl compounds is a greatly promising route for biomass valorization. Robust, facile-prepared, and cost-effective inorganic Zr-based catalysts for this transformation remain highly desirable. Herein, Zr-containing montmorillonite (denoted as Zr-MMT) was constructed by the ion exchange of Zr4+ with the interlayer cations of montmorillonite (MMT). Very interestingly, as an inorganic catalyst, the prepared Zr-MMT showed high catalytic activity for MPV reduction of various biomass-derived carbonyl compounds Systematic investigations revealed that the excellent performance of Zr-MMT predominantly originated from more pos. charged Zr species ([Zrx(OH)y(H2O)n](4x-y)+), which could boost the activation of the carbonyl group and simultaneously promote the hydrogen transfer process assisted by suitable basic sites on MMT. Notably, the preparation of Zr-MMT avoided the utilization of surfactants or expensive organic ligands, and the prepared Zr-MMT showed better or comparable catalytic performance than most reported Zr-containing catalysts, significantly enabling it to be more practical.

ACS Sustainable Chemistry & Engineering 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, Safety of Ethyl 4-oxopentanoate.

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

Zhao, Pingping published the artcileSynergistic Effect of Different Species in Stannic Chloride Solution on the Production of Levulinic Acid from Biomass, Application of Ethyl 4-oxopentanoate, the main research area is synergistic species stannic chloride solution levulinate biomass.

Metal chloride has shown high potential in biomass conversion to valuable chems., but the nature of active species and the corresponding performances on each successive reaction step need further elucidation. In this work, SnCl4 was found to exhibit satisfactory catalytic activity, achieving 64.6 mol % yield of levulinic acid from corncob residue. The levulinic acid obtained could be further converted to more valuable Et levulinate with 85% yield without any extra catalyst addition In water medium, the hydrolysis of SnCl4 resulted in the formation of stannic oxide, H+ and Cl-, which showed a synergistic effect and all contributed to levulinic acid production It was demystified that Cl- promoted cellulose hydrolysis, and the formed H+ as Bronsted acid mainly contributed to cellulose hydrolysis and fructose dehydration, as well as HMF decomposition to levulinic acid. Sn(IV) species facilitated both glucose-to-fructose isomerization and fructose consumption yielding undesirable polymers, but exhibited a neg. influence on cellulose hydrolysis. The proposed kinetic model showed a good fit with the exptl. result, and further confirmed the proposed catalytic mechanism. The insights reported here might give some useful information for the development of effective catalysts to produce valuable chems. directly from raw lignocelluloses.

ACS Sustainable Chemistry & Engineering 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, Application of Ethyl 4-oxopentanoate.

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

Liu, Yixuan published the artcileCatalytic Stereoselective Conversion of Biomass-Derived 4′-Methoxypropiophenone to Trans-Anethole with a Bifunctional and Recyclable Hf-Based Polymeric Nanocatalyst, Application In Synthesis of 539-88-8, the main research area is methoxypropiophenone transanethole hafnium polymeric nanocatalyst catalytic stereoselective conversion; bifunctional catalysis; biomass conversion; dehydration; transfer hydrogenation; unconventional MOFs/polymeric materials.

Anethole (AN) is widely used as an odor cleaner in daily necessities, and can also be applied in the fields of food additives, drug synthesis, natural preservatives, and polymeric materials′ preparation Considering environmental and economic benefits, the use of biomass raw materials with non-precious metal catalysts to prepare high-value fine chems. is a very promising route. Here, we developed an acid-base bifunctional polymeric material (PhP-Hf (1:1.5)) composed of hafnium and phenylphosphonate in a molar ratio of 1:1.5 for catalytic conversion of biomass-derived 4′-methoxypropiophenone (4-MOPP) to AN via cascade Meerwein-Pondorf-Verley (MPV) reduction and dehydration reactions in a single pot. Compared with the traditional catalytic systems that use high-pressure hydrogen as a hydrogen donor, alc. can be used as a safer and more convenient hydrogen source and solvent. Among the tested alcs., 2-pentanol was found to be the best candidate in terms of pronounced selectivity. A high AN yield of 98.1% at 99.8% 4-MOPP conversion (TOF: 8.5 h-1) could be achieved over PhP-Hf (1:1.5) at 220 °C for 2 h. Further exploration of the reaction mechanism revealed that the acid and base sites of PhP-Hf (1:1.5) catalyst synergistically promote the MPV reduction step, while the Bronsted acid species significantly contribute to the subsequent dehydration step. In addition, the PhP-Hf polymeric nanocatalyst can be recycled at least five times, showing great potential in the catalytic conversion of biomass.

Polymers (Basel, Switzerland) 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, Application In Synthesis of 539-88-8.

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

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

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

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

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

Nowicki, Janusz published the artcileEthanolysis of selected catalysis by functionalized acidic ionic liquids: an unexpected effect of ILs structural functionalization on selectivity phenomena, Category: esters-buliding-blocks, the main research area is dehydration catalyst monosaccharide glucose fructose; biomass ionic liquid ethanolysis catalysis ethylxyloside hydroxymethyfurfural HMF EMF.

A series of functionalized hydrogen sulfate imidazolium ILs were synthesized and applied as catalysts in the reaction of glucose, xylose and fructose with ethanol. In this research, an unexpected selectivity phenomenon was observed It showed that in this reaction functionalized ILs should be considered as a special type of catalyst. Functionalization of alkyl imidazolium ILs, especially the addition of electroneg. OH groups, causes a clear and unexpected effect manifested via visible changes in the selectivity of the reaction studied. In the case of fructose, an increase in the number of OH groups affects an increase in the selectivity towards Et levulinate from 14.2% for [bmim]HSO4 to 20.1% for [glymim]HSO4 with an addnl. increase in selectivity to 5-hydroxymethyfurfural. In turn, for xylose, the introduction of OH groups to the alkyl chain was manifested by a decrease in selectivity to furfural as its Et acetal and an increase in selectivity to ethylxylosides.

New Journal of 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, Category: esters-buliding-blocks.

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