Tag: M.W=100-150

Srinivasa Rao, B. published the artcileDehydrative etherification of carbohydrates to 5-ethoxymethylfurfural over SBA-15-supported Sn-modified heteropolysilicate catalysts, COA of Formula: C7H12O3, the main research area is carbohydrate ethoxymethylfurfural silica tin heteropolysilicate catalyst dehydrative etherification.

Dehydration followed by the alcoholysis of glucose/fructose to 5-ethoxymethylfurfural (EMF) was carried out over SBA-15-supported tin-modified heteropolysilicate (SnSTA) catalysts. The physico-chem. properties of the catalysts were explored by X-ray diffraction, Fourier-transform IR spectroscopy (FT-IR), pyridine-adsorbed FT-IR spectroscopy, transmission electron microscopy (TEM), N2 physisorption, laser Raman and NH3 temperature-programmed desorption techniques. The characterization results confirmed that the Sn-exchanged STA species were productively embedded inside the pores of SBA-15 without disturbing the parent hexagonal structure. High conversion and selectivity towards EMF were achieved with 20 wt% Sn0.75STA on SBA-15. The high activity of the catalyst could be attributed to the well-dispersed intact Keggin Sn0.75STA on the support, which led to the generation of sufficient Bronsted and Lewis acidic sites. The influence of various reaction parameters such as catalyst weight, reaction temperature, and time was studied along with the stability and reusability of the catalyst.

Sustainable Energy & Fuels published new progress about Absorption. 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

Golubeva, Maria A. published the artcileSelective production of γ-valerolactone and ethyl valerate from ethyl levulinate using unsupported nickel phosphide, COA of Formula: C7H12O3, the main research area is valerolactone ethyl valerate levulinate nickel phosphide.

Unsupported nickel phosphide catalyst containing Ni2P phase was applied in the hydrodeoxygenation of Et levulinate in ethanol medium for the first time. The obtained catalyst was investigated by XRF, XRD, NH3-TPD, XPS and TEM techniques. γ-Valerolactone and Et valerate were obtained as the hydrodeoxygenation products. Varying the temperature and the reaction time it was possible to obtain these products with high selectivity. γ-Valerolactone was selectively formed at 200-250°C and Et valerate was selectively formed at temperatures of 300-350°C. Increase in reaction time was contributed to Et valerate formation. The highest selectivity of Et valerate was 100% at full Et levulinate conversion at 350°C after 6 h. 100% γ-Valerolactone selectivity was reached at low conversion of Et levulinate. The highest yield of γ-valerolactone reached 41.7% after 6 h of the reaction at 250°C. The selectivity of γ-valerolactone was 86.9% and the conversion of Et levulinate was 48.0%.

Applied Catalysis, A: General published new progress about Deoxidation. 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

Golubeva, Maria A. published the artcileHydroprocessing of furfural over in situ generated nickel phosphide based catalysts in different solvents, SDS of cas: 539-88-8, the main research area is nickel phosphide catalyst furfural hydrodeoxygenation solvent.

The present work is dedicated to the nickel phosphide based catalysts, containing particles, generated in situ in the reaction medium from the different catalytic systems. The present catalytic systems exhibited high activity in the hydroprocessing of furfural. Full conversion of furfural depending on conditions was reached after 0.5-3 h of reaction at 250-350°C. 2-methylfuran was obtained as a main product in toluene with the highest selectivity of 77%. Et levulinate and 2-methylfuran with selectivity of 40% and 38% resp. were obtained as main products in ethanol under different conditions. Different reaction medium and nickel phosphide precursors had an influence on the obtained phases of catalysts. Ni12P5 and Ni2P were obtained in toluene from oil-soluble precursors and Ni12P5 was obtained in ethanol from water-soluble precursors.

Applied Catalysis, A: General published new progress about Deoxidation. 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

Golubeva, M. A. published the artcileIn Situ Generated Nickel Phosphide Based Catalysts for Hydroprocessing of Levulinic Acid, Formula: C7H12O3, the main research area is nickel phosphide catalyst levulinic acid hydroconversion.

This article describes the production of unsupported nickel phosphide catalysts generated in situ in a reaction mixture from water-soluble and oil-soluble precursors during the hydroconversion of levulinic acid. These catalysts contain crystalline phases, specifically Ni12P5 and Ni(PO3)2. During the hydrogenation of levulinic acid in toluene in the presence of NiP-TOP, a lower temperature and a shorter reaction time contribute to the formation of γ-valerolactone (100% selectivity). A higher temperature and a longer reaction time favor the formation of valeric acid (94% selectivity). In the hydrogenation of levulinic acid in ethanol in the presence of NiP-H3PO2, the main reaction product is Et levulinate (95% selectivity).

Petroleum Chemistry published new progress about Deoxidation. 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

Nedyalkova, Miroslava A. published the artcileCalculating the Partition Coefficients of Organic Solvents in Octanol/Water and Octanol/Air, Related Products of esters-buliding-blocks, the main research area is partition coefficient organic solvent octanol water octanol air calculation.

Partition coefficients define how a solute is distributed between two immiscible phases at equilibrium The exptl. estimation of partition coefficients in a complex system can be an expensive, difficult, and time-consuming process. Here a computational strategy to predict the distributions of a set of solutes in two relevant phase equilibrium is presented. The octanol/water and octanol/air partition coefficients are predicted for a group of polar solvents using d. functional theory (DFT) calculations in combination with a solvation model based on d. (SMD) and are in excellent agreement with exptl. data. Thus, the use of quantum-chem. calculations to predict partition coefficients from free energies should be a valuable alternative for unknown solvents. The obtained results indicate that the SMD continuum model in conjunction with any of the three DFT functionals (B3LYP, M06-2X, and M11) agrees with the observed exptl. values. The highest correlation to exptl. data for the octanol/water partition coefficients was reached by the M11 functional; for the octanol/air partition coefficient, the M06-2X functional yielded the best performance. To the best of our knowledge, this is the first computational approach for the prediction of octanol/air partition coefficients by DFT calculations, which has remarkable accuracy and precision.

Journal of Chemical Information and Modeling published new progress about Air. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Related Products of esters-buliding-blocks.

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

Coelho, Eduardo published the artcileVolatile fingerprinting differentiates diverse-aged craft beers, HPLC of Formula: 5405-41-4, the main research area is volatile fingerprinting Saccharomyces Brettanomyces beer aging.

Beer ageing on wood is a complex and difficult to control process involving several reactions and compounds Difficulties in understanding the underlying phenomena often lead to empirical and unpredictable processes and heterogeneous products. This work resorts to volatile fingerprinting along with multivariate anal. as tools to differentiate and highlight differences in beers derived from diverse production processes. Volatile composition of beers originating from barrel ageing processes and unaged beer were analyzed by GC-MS. The collected data was processed by principal component anal., which allowed the evaluation of relations between samples and volatile compounds Beers were distinguished by clusters comprising different groups of volatiles. Beer with the longest period in barrel was in the cluster with the most volatiles. Beer produced by resident barrel microbiota fermentation was characterized by presence of Brettanomyces sp. metabolites. Beer aged in barrel by a shorter time period showed characteristic content of Et esters and oak extractives. Beer produced in inox vat and beer fermented in barrel with pitching of S. cerevisiae appeared in the same cluster, relating with fermentative esters. Volatile fingerprinting was a viable approach to characterize and distinguish the analyzed beers, providing relevant information regarding the impact of production methodologies in volatile composition

LWT–Food Science and Technology published new progress about Beer. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, HPLC of Formula: 5405-41-4.

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

Nski, Alan Gasi published the artcileVolatile compounds content, physicochemical parameters, and antioxidant activity of beers with addition of mango fruit (Mangifera Indica), Synthetic Route of 5405-41-4, the main research area is volatile compound physicochem parameter antioxidant Mangifera Indica; Mangifera indica; beer; gas-chromatography; in-needle SPME; solid-phase microextraction; total polyphenols conent; volatile compounds.

This study was performed to determine the possibility of using mango fruit (Mangifera indica) in brewing technol. The aim of using the SPME-HS-GC-MS technique was to assess what changes occurred in the volatile composition of mango beers brewed in this study. Mango fruit was added to the beer in five different forms to ascertain what kind of preparation should be used to improve beer aroma. Anal. of the volatile components in mango beer showed that beer without mango addition was characterized by the lowest content of volatile compounds (1787.84μg/100 mL). The addition of mango fruit increased the concentration of compounds, such as α-pinene, β-myrcene, terpinolene, α-terpineol, cis-β-ocimene, caryophyllene, and humulene, in beer. Beer prepared with mango pulp addition was characterized by the highest concentration of volatile components from mango beers (2112.15μg/100 mL). Furthermore, beers with mango addition were characterized by a higher polyphenol content (up to 44% higher than control beer) and antioxidant activity than control beer and were evaluated by a trained panel as having a better taste and aroma than beer without fruit addition

Molecules published new progress about Beer. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Synthetic Route of 5405-41-4.

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

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

Qian, Xu published the artcileAlcohol acyltransferase gene and ester precursors differentiate composition of volatile esters in three interspecific hybrids of Vitis labrusca × V. Vinifera during berry development period, Recommanded Product: Ethyl 3-hydroxybutanoate, the main research area is alc acyltransferase gene ester precursor Vitis hybrid berry development; Alcohol acyltransferase; Ester precursors; Esters; Grape varieties; Transcriptome analysis.

This study investigated the accumulation of esters in three hybrid grape cultivars during berry development under two vintages to elucidate the differentiation on their esters biosynthesis. Results showed ‘Moldova’ showed lower esters content than ‘Campbell Early’ and ‘Catawba’ resulting from its limited AAT gene expression and 20 different encoded amino acids. The volatile esters compositions of ‘Campbell Early’ and ‘Catawba’ in both vintages were different. Correlation anal. revealed that concentrations of hexyl acetate, 2-phenethyl acetate, Et (E,E)-2,4-hexadienoate and Et phenylacetate were related to their corresponding alcs. level, whereas threonine and alanine affected Et heptanoate formation. Transcriptome anal. indicated that 1847, 1781 and 1870 DEGs, at E-L 35, 36 and 38, resp., were characterized between ‘Campbell Early’ and ‘Catawba’. The expression level of genes related to the volatile ester precursors biosynthesis, including PRX-VIT_211s0016g05320, PAO-VIT_217s0000g09100, ACOX-VIT_212s0028g02660, ACOX-VIT_216s0022g01120, echA-VIT_205s0077g00860 and ACOX-VIT_200s0662g00010, exhibited a pos. correlation to the concentrations of their corresponding volatile esters.

Food Chemistry published new progress about Grape. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Recommanded Product: Ethyl 3-hydroxybutanoate.

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