Tag: M.W=100-150

Corona, Onofrio published the artcileQuality and volatile compounds in red wine at different degrees of dealcoholization by membrane process, Computed Properties of 5405-41-4, the main research area is red wine volatile compound phenol sensory property dealcoholization.

This study investigated the effect of different degrees of dealcoholization on volatile compounds, phenols and sensory characteristics of red wine (cv. Montepulciano d’Abruzzo). The wine with an initial alc. content of 13.2% volume/volume was partially dealcoholized by membrane process with a decrease of alc. degree as follows: – 4.9; – 6.3; – 7.8, – 9.2 and – 10.5% volume/volume Osmotic distillation has proved effective in preserving a satisfactory odorous profile, as samples with an alc. residue of 8.3% volume/volume (- 4.9%) and 6.9% volume/volume (- 6.3%) showed good esters retention more than 84% and 82%, resp. Similarly, color and taste, evaluated by flavonoids and phenolic compounds, remained almost unchanged in all dealcoholized samples. Lastly, the trials highlighted that dealcoholized wine up to an alc. content of about 5.4% volume/volume (- 7.8%) was still perceived as acceptable by the tasters.

European Food Research and Technology published new progress about Flavonoids Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Computed Properties of 5405-41-4.

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

Hadj Saadoun, Jasmine published the artcileProduction and recovery of volatile compounds from fermented fruit by-products with Lacticaseibacillus rhamnosus, Quality Control of 5405-41-4, the main research area is Lacticaseibacillus Cucumis Citrus fermentation volatile compound.

In the last years, due to the increasing interest of consumers in natural products, market and industry choices were more directed towards the use of fragrances and flavors obtained from natural sources. Fermentation is a biol. approach helpful to produce diverse aromatic compounds modifying precursors present in raw material, due to a wide array of extracellular enzymes which could be produced by microorganisms. Following this direction Lacticaseibacillus rhamnosus was employed as a starter for melon and orange byproducts fermentation Simple and vacuum distillation were applied for the recovery of the aromatic fraction and compared to identify the more promising in terms of aromatic profile composition Detection and characterization of aromatic compounds were achieved using Head SpaceSolid Phase MicroExtn. Gas Chromatog.-Mass Spectrometry (HS-SPME/GC-MS) approach. Fermentation led to interesting changes, increasing floral, herbal green and fruity notes. Overall, simple distillation allowed the greater recovery of aromatic compounds in terms of concentration for both substrates. This study highlights a possible strategy to produce complex distillates, composed of a mixture of aroma compounds, to be employed as additives in food, feed or perfumery industries as ingredients of natural origin.

Food and Bioproducts Processing published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), REM (Removal or Disposal), BIOL (Biological Study), PROC (Process). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Quality Control of 5405-41-4.

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

Li, Hong-Xing published the artcileA hydroxyl-functionalized homochiral porous organic cage for gas chromatographic separations, Computed Properties of 5405-41-4, the main research area is hydroxyl functionalized homochiral porous organic cage gas chromatog separation; Capillary column; Chiral separation; Chiral stationary phase; Gas chromatography; Porous organic cage; Positional isomers; Racemates.

A hydroxyl-functionalized homochiral porous organic cage (POC) was synthesized and characterized by FTIR, NMR, thermogravimetric anal. (TGA), MALDI-TOF-MS, and elemental anal. The synthesized homochiral POC was used as stationary phase to prepare a capillary gas chromatog. (GC) column by a static coating method. The fabricated column shows excellent selectivity not only for the separation of positional isomers but also for the resolution of various racemates. Thirty-nine racemates have been resolved on the column, including alcs., diols, halohydrocarbons, epoxides, esters, lactones, ketones, ethers, and organic acids. Compared to the com. β-DEX 120 column and previously reported chiral POCs (CC3-R, CC9, and CC10)-coated columns, there are 11, 10, 24, and 15 tested racemates that cannot be resolved on β-DEX 120 column, CC3-R column, CC9 column, and CC10 column, resp. This reveals that the fabricated column has prominent complementarity or superior separation performance to these columns in enantioseparation Besides, the fabricated column can achieve some enantioseparations which are not possible using all previously reported chiral POC-based columns. Some positional isomers (xylenes, dichlorobenzenes, dibromobenzenes, nitrochlorobenzenes, and nitrobromobenzenes) were also separated with high-resolution values. The column exhibits good repeatability, reproducibility, and stability.

Microchimica Acta published new progress about Chiral resolution. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Computed Properties of 5405-41-4.

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

Chacon-Parra, Andres published the artcileA multi-component reaction kinetics model for the hydrothermal liquefaction of carbohydrates and co-liquefaction to produce 5-ethoxymethyl furfural, HPLC of Formula: 539-88-8, the main research area is ethoxymethyl furfural cellulose fructose glucose hydrothermal liquefaction carbohydrate decomposition.

Hydrothermal liquefaction (HTL) as a waste management technol. has been investigated to produce renewable bio-crude and other valuable products from wet biomass and bio-waste. However, carbohydrates as a vital component in biomass have shown to increase the complexity of the process. Undesirable solid yields produced by the carbonisation/re-condensation of reactive carbohydrate intermediates could limit the renewable crude yield and recovery. In the present study, the reaction mechanism and kinetic models for the HTL of monosaccharides and polysaccharides are investigated using gas chromatog.-mass spectrometry (GC-MS) and high-performance liquid chromatog. (HPLC) to characterize, validate and quantify the most abundant organic species in the aqueous phase. The exptl. data and models presented provide an unbiased understanding of the carbohydrate decomposition during HTL conversion, while the anal. of solid products clarifies solid transformations and integrates both phases into a more comprehensive reaction mechanism approach, including a shrinking core model for cellulose. Finally, ethanol and acetic acid were added as co-solvents to elucidate the effects of a fully renewable hydrogen donor solvent system to generate 5-ethoxymethyl furfural and Et levulinate (validated with GC-MS), two renewable fuel additives and promising tunable monomers candidates. Experiments were conducted with glucose, fructose, and cellulose in a batch reactor with 20% by mass premixed feedstock at 250°C and 300°C.

Fuel published new progress about Decomposition. 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

Chang, Meng-Yang published the artcileBi(OTf)3-Mediated (4+1) Annulation of α-Sulfonyl o-Hydroxyacetophenones with α-Hydroxy Arylketones to Access Sulfonyl 2-Aroylbenzofurans, Synthetic Route of 623-50-7, the main research area is sulfonyl aroylbenzofuran green preparation; hydroxyacetophenone sulfonyl hydroxy aryl ketone cyclocondensation bismuth trifluoromethanesulfonate mediated; methyl aroylbenzofuran green preparation; aryl ketone hydroxy acetophenone cyclocondensation bismuth trifluoromethanesulfonate mediated.

A high-yield, facile route for the scalable synthesis of sulfonyl 2-aroylbenzofurans I [R = Me, Ph, 4-MeC6H4, etc.; R1 = 5-Me, 5-F, 5-Cl, etc.; Ar = Ph, 4-MeC6H4, 2-naphthyl, etc.] via a Bi(OTf)3-mediated intermol. double cyclocondensation of α-sulfonyl o-hydroxyacetophenones with substituted α-hydroxy arylketones under mild open-vessel reaction conditions was described. Also, synthesis of 3-methyl-2-aroylbenzofurans II [R2 = 5-OMe, 5-F, 5-Cl, etc.; Ar1 = Ph, 4-BrC6H4, 2-thienyl, etc.] was obtained under same reaction conditions using o-hydroxyacetophenones with substituted α-hydroxy aryl ketones. In the overall reactions, water was generated as the only byproduct. Various metal triflate-promoted reactions and conditions were investigated for the efficient one-pot (4+1) annulation reaction.

Advanced Synthesis & Catalysis published new progress about Aryl ketones Role: PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, Synthetic Route of 623-50-7.

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

Alper, Koray published the artcileUse of a Lewis acid, a Bronsted acid, and their binary mixtures for the liquefaction of lignocellulose by supercritical ethanol processing, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is lignocellulose supercritical ethanol liquefaction Lewis acid catalyst.

Supercritical ethanol liquefaction of teak wood was carried out at 300°C for 30 min without and with the use of Mg(ClO4)2, HClO4, and HClO4/Mg(ClO4)2 at various loadings (2-10 mmol). The bio-oil yield from the non-catalytic supercritical ethanol liquefaction of teak wood was ∼41 weight%. The highest bio-oil yield (∼58.2 weight%) was obtained with the catalytic run using 2 mmol of Mg(ClO4)2. In the catalyzed trials, with the use of either Mg(ClO4)2 or HClO4, an increase in catalyst amounts resulted in a decrease in bio-oil yields. There was no clear trend for the use of co-catalysts. A degree of de-oxygenation was observed with the use of the catalysts studied. The O/C at. ratio of the bio-oil from the non-catalytic was 0.44. The O/C at. ratios in the bio-oil produced from catalytic runs ranged from 0.25 to 0.38. In the bio-oil from the non-catalytic run, the major compound was phenolic species, whereas esters were dominant in the bio-oils from the catalytic runs. The type of catalyst and its amount had significant effects on the product distributions and compositions The prominent ester compounds were Et lactate and Et levulinate. The highest relative yield of Et levulinate was 49.1% and obtained with the use of the Mg(ClO4)2/HClO4 (2 mmol : 10 mmol) catalyst. The heating values of the bio-oils from catalytic runs were higher than that of the non-catalytic run. The highest heating value of 31.21 MJ kg-1 was obtained with the Mg(ClO)2/HClO4 (2 mmol : 10 mmol) catalyst.

Sustainable Energy & Fuels published new progress about Alcohols Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation). 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

Liu, Dong-Huang published the artcileCatalytic One-Pot Conversion of Renewable Platform Chemicals to Hydrocarbon and Ether Biofuels through Tandem Hf(OTf)4+Pd/C Catalysis, Name: Ethyl 4-oxopentanoate, the main research area is alkane cyclic ether biofuel biomass catalyst hydrogenation hydrodeoxygenation; biomass; cyclic ethers; hydrocarbons; platform chemicals; tandem catalyst.

Efficient conversion of renewable biomass platform chems. into high-quality fuels remains challenging. A one-pot catalytic approach has been developed to synthesize various structurally defined biofuels by using Hf(OTf)4 and Pd/C for selective tandem catalysis and 2-methylfuran (2-MF) as a renewable feedstock. 2-MF first undergoes Lewis acid-catalyzed hydroxyalkylation/alkylation (HAA) condensation with carbonyl compounds to afford intermediates containing the targeted carbon skeletons of hydrocarbon or ether products, and these intermediates then undergo hydrogenation or hydrodeoxygenation to afford the target products, catalyzed by metal triflate+Pd/C in the same pot. The present process can produce structurally defined alkanes and cyclic ethers under mild conditions.

ChemSusChem published new progress about Biofuels. 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

Mangas-Sanchez, Juan published the artcileAsymmetric synthesis of primary amines catalyzed by thermotolerant fungal reductive aminases, Computed Properties of 539-88-8, the main research area is ketone ammonia fungal aminase catalyst enantioselective reductive amination; amine preparation.

The structural and biochem. characterization as well as synthetic applications of two RedAms from Neosartorya spp. was described. (NfRedAm and NfisRedAm) that displayed a distinctive activity amongst fungal RedAms, namely a superior ability to use ammonia as the amine partner. Using these enzymes, The synthesis of a broad range of primary amines, with conversions up to >97% and excellent enantiomeric excess was demonstrated . Temperature dependent studies showed that these homologues also possess greater thermal stability compared to other enzymes within this family. Their synthetic applicability was further demonstrated by the production of several primary and secondary amines with turnover numbers (TN) up to 14 000 as well as continous flow reactions, obtaining chiral amines such as (R)-2-aminohexane in space time yields up to 8.1 g L-1 h-1. The remarkable features of NfRedAm and NfisRedAm highlight their potential for wider synthetic application as well as expanding the biocatalytic toolbox available for chiral amine synthesis.

Chemical Science published new progress about Aspergillus fischeri. 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

McCourt, Ruairi O. published the artcileA Sequential Acyl Thiol-Ene and Thiolactonization Approach for the Synthesis of δ-Thiolactones, Quality Control of 539-88-8, the main research area is thiolactone synthesis unsaturated ester acyl thiol ene Steglich thiolactonization.

A novel strategy for the synthesis of δ-thiolactones from inexpensive and readily available γ-unsaturated esters has been developed. This strategy incorporates a radical acyl thiol-ene reaction as the key C-S bond forming step. Cyclization is achieved via a Steglich-type thiolactonization of 5-mercaptopentanoic acids. We report the facile and scalable synthesis of δ-thiolactones in moderate to good yield under mild reaction conditions with tolerance for a range of functional groups.

Organic Letters published new progress about Johnson-Claisen rearrangement (for synthesis of γ-unsaturated esters). 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

Portnova, Svetlana V. published the artcileDensity and Viscosity of Glycolic, Lactic, and Malic Acid Esters, Synthetic Route of 623-50-7, the main research area is density kinematic viscosity aliphatic ester glycolic lactic malic acid.

Densities and viscosities were measured as a function of temperature for 12 esters of glycolic, DL-lactic, and DL-malic acids and linear chain alcs. C1-C5. The d. and kinematic viscosity were obtained using a pycnometer and a Pinkevitch capillary viscometer in a temperature range of 293.15-363.15 K with accuracies of 0.1 and 0.35%, resp. The obtained data were used for dynamic viscosity calculation It was demonstrated that the viscosity-temperature dependence of esters was described by the ASTM D341 model with an average absolute relative deviation of 1%. The temperature dependence of dynamic viscosity was fitted using the Arrhenius-like equation and Vogel-Fulcher-Tammann (VFT) model. It was found that the adjustable parameters A and B have the similar value for compounds in one homologous series. These parameters were taken as constant for each series of esters of the corresponding acids. The dynamic viscosity-temperature dependence of esters was better described by the VFT model than the Arrhenius-like equation. The capabilities of some group-additivity methods for predicting d. have been reviewed and compared with exptl. results.

Journal of Chemical & Engineering Data published new progress about Aliphatic esters Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation). 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, Synthetic Route of 623-50-7.

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