Category: 539-88-8

Bodachivskyi, Iurii published the artcileUnderstanding the role of the substrate and the metal triflate acidic catalyst in sugar platform biorefineries: A comprehensive systematic approach to catalytic transformations of (poly)carbohydrates in ethanol, COA of Formula: C7H12O3, the main research area is levulinate furfural ethylacetal bronsted Lewis acid catalyst dehydration isomerization; polysaccharide dehydration bronsted acid catalyst preparation monosaccharide glucoside xyloside.

We systematically explore a range of model conversions of mono- and disaccharides, and of linear and branched polysaccharides under the catalytic action of metal trifluoromethanesulfonates (metal triflates) in ethanol. This highlights the preferred reactivity of specific (poly)carbohydrates, and the interplay between selectivities of the reactions and the dominating catalyst activity (Bronsted or Lewis). It unambiguously delineates that selectivities of acid-catalyzed transformations of (poly)carbohydrates into value added platform chems. rely on the origin of the substrate, any (pre)treatment, the acidic catalyst, and the reaction conditions. The optimized catalytic systems enable very efficient conversion of cellulosic carbohydrates into significantly value added Et glucosides (yields up to 63%), Et xylosides (yields up to 69%), Et levulinate (yields up to 75%), Et lactate (yields up to 98%), ethoxyacetaldehyde diethylacetal (yields up to 33%), and furfural diethylacetal (yields up to 44%), depending on the substrate and reaction conditions.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Corn. 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

Zhang, Yuan-Yuan published the artcileDesign, Synthesis, and Biological Activity of Novel Diazabicyclo Derivatives as Safeners, HPLC of Formula: 539-88-8, the main research area is diazabicyclo derivative herbicide safener corn glutathione transferase; N-substituted diazabicyclo; fragment splicing; herbicide safener; intermediate derivatization approach; microwave-assistant synthesis.

Herbicide safeners selectively protect crops from herbicide damage without reducing the herbicidal efficiency on target weed species. The title compounds were designed by intermediate derivatization approach and fragment splicing in order to exploit novel potential safeners. A total of thirty-one novel diazabicyclo derivatives were synthesized by microwave-assistant method using isoxazole-4-carbonyl chloride and diazabicyclo derivatives All synthetic compounds were confirmed by IR, 1H NMR, 13C NMR, HRMS. The bioassay results demonstrated that most of the title compounds could reduce the nicosulfuron phytotoxicity on maize. The glutathione-S-transferase (GST) activity in vivo was assayed and compound 4 (S15) revealed an inspiring safener activity comparable to commercialized safeners isoxadifen-Et and BAS-145138. The mol. docking model exhibited that the competition at the active sites of target enzymes between compound (I) and nicosulfuron was investigated with respect to herbicide detoxification. The current work not only provided a powerful supplement to the intermediate derivatization approach and fragment splicing in design pesticide bioactive mols., but also assisted safener development and optimization.

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

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

Mulero, A. published the artcileRecommended Correlations for the Surface Tension of Aromatic, Polyfunctional, and Glyceride Esters, Category: esters-buliding-blocks, the main research area is aromatic polyfunctional glyceride ester surface tension correlation.

Surface tension values for 79 esters, including aromatics, polyfunctional, and glycerides, have been compiled from databases, books, and papers in the literature. The data have been carefully screened, and finally, 1517 values were selected. Each fluid dataset has been fitted with the Guggenheim-Katayama correlation with two or four adjustable parameters. Recommended correlations are proposed for each ester, providing mean absolute deviations below 0.50 mN/m for 77 of them, mean absolute percentage deviations below 1.7% for 76 of them, and percentage deviations below 10%, except for four data out of the 59 selected for tricaprylin. The highest deviations found are due to the disagreement between the data obtained from different sources and not to an inadequate math. form of the correlation model. These correlations are added to the collection of those previously proposed for different fluids, including common substances, alcs., refrigerants, organic acids, n-alkanes, and 80 other esters. (c) 2022 American Institute of Physics.

Journal of Physical and Chemical Reference Data published new progress about Fluids. 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

Gong, Chen published the artcileProduction of levulinic acid and ethyl levulinate from cellulosic pulp derived from the cooking of lignocellulosic biomass with active oxygen and solid alkali, Application of Ethyl 4-oxopentanoate, the main research area is levulinic acid ethyl levulinate cellulosic pulp oxygen lignocellulosic biomass.

Biomass-derived levulinic acid (LA) and its esters are currently envisaged as versatile, renewable platform chems. In this study, cellulosic pulp derived from the cooking of lignocellulosic biomass with active oxygen and solid alkali was employed as raw material for the formation of LA or Et levulinate (EL). This pretreatment process is highly effective for the delignification and deconstruction of lignocellulose matrix, making a facile degradation of the resulting cellulosic pulp to LA or EL. At this point, the acid-catalyzed hydrolysis or ethanolysis of cellulosic pulp was optimized by response surface methodol. (RSM), offering desirable LA yield of 65.3% or EL yield of 62.7%, which is significantly higher than those obtained from raw biomass. More importantly, coking behavior on the inwall of the reactor was eliminated during the hydrolysis or ethanolysis of cellulosic pulp, which is one of the top challenges for the acid-catalyzed conversion of biomass in an industrial scale.

Korean Journal of Chemical Engineering published new progress about Bamboo. 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

Xie, Zean published the artcileSeparation of methyl glycosides and glycerol from aqueous fraction of methyl bio-oils using nanofiltration, Category: esters-buliding-blocks, the main research area is methyl glycoside glycerol aqueous fraction bio oil nanofiltration.

The feasibility of separating small mol. organic compounds in the aqueous fraction of Me bio-oils (AFMBO) using nanofiltration (NF) and reverse osmosis (RO) membranes was studied. Four kinds of com. available NF and RO membranes were studied preliminarily by using model solutions (aqueous solution of Me glycosides and glycerol). The membrane module was spiral wound, which is a more suitable format for industrialization than the flat-sheet format for dead-end filtration. The NF400-600 membrane exhibited the best separation performance; the permeate flux was 48.6 L/(m2·h), the Me glucosides (MEG) rejection ratio was 95.4%, and the transmission of glycerol was 81.0% with an initial concentration of 10 g/L (0.4 MPa, 45 °C). Compared with the model solution, the NF performance of AFMBO, which included permeate flux, rejection of MEG, transmission of glycerol, and separation of the other components in AFMBO, was investigated. The more complex constituents of AFMBO led to NF400-600 permeability and separating property decline compared with the model solution in the same operating conditions; meanwhile more serious and even irreversible membrane fouling occurred. This research provided a reference for membrane separation industrial feasibility and application of AFMBO.

BioResources published new progress about Fouling. 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

Kothe, Vinicius published the artcileThermodynamic analysis, experimental and kinetic modeling of levulinic acid esterification with ethanol at supercritical conditions, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is levulinic acid esterification ethanol thermodn kinetic model.

Et levulinate is an environmentally friendly biomass-derived ester that is an alternative to the classic petroleum-derived fuel additives. Several studies have been addressed to its chem. production pathways. The supercritical esterification of levulinic acid to Et levulinate, however, remains understudied. This work reports the effect of process variables and a kinetic study for the esterification of levulinic acid with ethanol under sub and supercritical conditions. Exptl. data were obtained in a continuous tubular reactor at a fixed pressure of 100 bar. The reaction temperature varied from 220 to 280 °C, and the ethanol to levulinic acid molar ratios from (2:1) to (9:1). Et levulinate was synthesized with high selectivity under all evaluated reaction conditions, achieving conversions up to 80% and 93% when ethanol to levulinic acid molar ratios of (2:1) and (9:1) were used, resp. A PFR model approach was considered with an elementary reversible self-catalyzed rate law, and the effect of considering the mixture d. behavior through the reactor using the PC-SAFT equation of state was discussed. The proposed kinetic approach was able to correlate the kinetic exptl. data for all exptl. conditions used in this study. Furthermore, a thermodn. anal. was performed to elucidate trends in reaction performance.

Fuel published new progress about Density. 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

Russo, Vincenzo published the artcileKinetic study of Amberlite IR120 catalyzed acid esterification of levulinic acid with ethanol: From batch to continuous operation, Category: esters-buliding-blocks, the main research area is levulinic acid ethanol esterification cation exchanger kinetics ethyl levulinate.

Levulinic acid (LA) is 1 of the most important platform chems. as it is a versatile building block for a variety of high value-added products, fine chems. and pharmaceutical intermediates. Catalytic esterification of LA with alkyl alcs. leads to levulinate esters which can be used as fragrances, flavoring agents and fuel additives. The kinetics of the levulinic acid esterification with EtOH in the presence of Amberlite IR120 was studied in a batch reactor. The collected exptl. data were interpreted with a reliable model taking into account also for the mass transfer phenomena involved in the reaction network. The kinetic model was further validated by conducting experiments in a fixed bed reactor. The reactor was characterized in terms of fluid-dynamics and the collected kinetic data were interpreted with a reliable reactor model, considering the extent of the reaction and fluid-solid mass transfer limitation.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Density. 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

Ozeren, Husamettin D. published the artcileIn Silico Screening of Green Plasticizers for Poly(vinyl chloride), Computed Properties of 539-88-8, the main research area is polyvinyl chloride green plasticizer simulation property.

Phthalate derivative plasticizers used in poly(vinyl chloride) (PVC) processing have been a subject of concern because of their possible toxicity. Hence, there is a growing interest toward new, nontoxic, “”green”” plasticizers. In this work, the performances of biobased plasticizers including esters of succinic, levulinic, oleic, and adipic acids were compared in reference to the conventional plasticizer bis(2-ethylhexyl) phthalate (aka dioctyl phthalate or DOP). For this purpose, mol. dynamics (MD) simulations were used to determine polymer/plasticizer interactions and to predict thermomech. properties of polymer mixtures The variation of glass temperatures (Tg) of the systems was investigated, and the stabilities of the polymer/plasticizer mixtures were compared through the Flory-Huggins solubility parameter. The mech. properties were investigated through nonequilibrium MD simulations. Young’s modulus and yield strength values were predicted through stress-strain curves. The results suggest that succinic acid derivatives have the potential to replace phthalate derivatives due to their good solubility in PVC and their effectiveness in reducing the Tg.

Macromolecules (Washington, DC, United States) published new progress about Density. 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

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

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