Category: 539-88-8

Zhao, Guodong published the artcileFenton-like chemistry enables catalytic oxidative desulfurization of thioacetals and thioketals with hydrogen peroxide, COA of Formula: C7H12O3, the main research area is carbonyl compound preparation green chem chemoselective; dithioacetal Fenton oxidative desulfurization cerium catalyst; alc preparation green chem chemoselective; methylthiomethyl ether Fenton oxidative desulfurization cerium catalyst.

A green catalytic approach that exploits Fenton-like chem. (FLC: CeBr3-H2O2) for the oxidative desulfurization of thioacetals RC(S(CH2)nX)R1 (R = R1 = 2,3-dihydro-1H-inden-1-yl, 9H-fluoren-9-yl, etc. R = H, Ph, thiopen-2-yl, etc. R1 Ph, H, n-Bu, n-pr, etc. X = O, NH, n = 1,2,3) and thioketals ROCH2SCH3 (R = Bn, cyclohexyl, cyclopentyl, etc.), and has many competitive advantages including (1) high efficiency (15 min, up to 97% yield), (2) high chemoselectivity with broad substrate scope, (3) greenness (H2O as the sole waste) with outstanding green chem. metrics, and (4) low cost has been reported. Detailed mechanistic studies revealed that the reactive brominating species (RBS, HOBr) generated in situ using Fenton-like chem. (i.e., HO) and bromide reacted with sulfide (thioacetals or thioketals) to form the bromosulfonium intermediate (RR’S-Br), which was attacked by a heteroatom such as sulfur, oxygen or nitrogen to initiate the hydrolysis to carbonyls RC=OR1 or alcs ROH. The released bromide ion (Br-) could be oxidized again by Fenton-like chem. to generate RBS for the next catalytic cycle. This highly efficient, chemoselective, and green approach for oxidative desulfurization is expected to find wide applications in organic synthesis.

Green Chemistry published new progress about Aldehydes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 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

Matos, Jeishla L. M. published the artcileCycloisomerization of Olefins in Water, COA of Formula: C7H12O3, the main research area is bioorthogonal cycloisomerization olefin water; DNA; cobalt; isomerization; kinetics; water chemistry.

Preparative reactions that occur efficiently under dilute, buffered, aqueous conditions in the presence of biomols. find application in ligation, peptide synthesis, and polynucleotide synthesis and sequencing. However, the identification of functional groups or reagents that are mutually reactive with one another, but unreactive with biopolymers and water, is challenging. Shown here are cobalt catalysts that react with alkenes under dilute, aqueous, buffered conditions and promote efficient cycloisomerization and formal Friedel-Crafts reactions. The constraining conditions of bioorthogonal chem. are beneficial for reaction efficiency as superior conversion at low catalyst concentration is obtained and competent rates in dilute conditions are maintained. Efficiency at high dilution in the presence of buffer and nucleobases suggests that these reaction conditions may find broad application.

Angewandte Chemie, International Edition published new progress about Alkylation, homolytic. 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

Cao, Xi published the artcileEfficient synthesis of γ-valerolactone from ethyl levulinate over Ni/V2O5, Related Products of esters-buliding-blocks, the main research area is valerolactone synthesis solid phase grinding.

Valerolactone (GVL) has been recognized as one of the most value-added chems. derived from biomass. In this work, an efficient Ni/V2O5 catalyst was prepared via solid phase grinding and in-situ reduction The Ni/V2O5 catalyst was employed for catalytic transfer hydrogenation (CTH) of Et levulinate (EL) to GVL using 2-propanol as a hydrogen source. An excellent GVL selectivity of 93.04% at EL conversion of 97.40% could be achieved at 180°C in 4 h using 30% Ni/V2O5 as the catalyst. This catalyst was able to be reused for five times with the GVL selectivity decreased a little. A possible adsorption mechanism of generate active H species in CTH of EL over Ni/V2O5 was proposed.

IOP Conference Series: Materials Science and Engineering published new progress about Solids. 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

Li, Jingyao published the artcileCharacterization of fragrant compounds in different types of high-salt liquid-state fermentation soy sauce from China, Formula: C7H12O3, the main research area is soy sauce liquid state fermentation fragrant compound China.

The aroma and sensory characteristics of 21 com. high-salt liquid fermentation soy sauces (HLFSS) suitable for different edible methods were investigated by MS-based non-targeted metabolomics workflow using headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC-MS) combined with sensory evaluation. A total of 325 compounds were detected, and 60 were considered aroma-active compounds Light soy sauce (LSS) and premium soy sauce (PSS) for direct dipping contained more alcs. and esters. Aldehydes and furans were more abundant in dark soy sauce (DSS) used for stir-frying and braising. Principal component anal. (PCA) clustered LSS, DSS, and PSS into different quadrants and distinguished HLFSS of north-south origin. In addition, orthogonal partial least squares discriminant anal. (OPLS-DA) confirmed that the difference in volatile compounds of HLFSS in northern and southern China was related to local manufacturers use of the Japanese and Cantonese fermentation processes. Sensory evaluations showed that LSS and PSS had prominent alc. and fruit aromas, while DSS had firmer caramel and malty aromas. Aroma-active compounds influenced regional differences in sensory attributes. The present study results will provide a theor. basis for broadening industrial soy sauce production with different flavors.

LWT–Food Science and Technology published new progress about Alcohols Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 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

Somkuwar, R. G. published the artcileVolatome finger printing of red wines made from grapes grown under tropical conditions of India using thermal-desorption gas chromatography-mass spectrometry (TD-GC/MS), HPLC of Formula: 539-88-8, the main research area is red wine grape volatile compound thermal desorption gas chromatog; Phenolics; Red wine varieties; TD–GC–MS; Volatile compounds; Wines.

The current study evaluated the key characters of aroma composition in diversified red wines (Cinsaut, Grenache, Cabernet Franc, Petit Verdot, Cabernet Sauvignon, Nielluccio, Tempranillo, Syrah, Merlot and Caladoc). Out of hundreds of volatile compounds 64 compounds were considered for study. Different groups consisting of fatty acids, volatile alcs., aldehydes, esters, volatile phenols and terpenes were analyzed using gas chromatog. mass spectrometry coupled with thermal desorption (TD-GC-MS). Among all these diversified classes, alcs. were found as the most dominant group followed by esters and acids whereas aldehydes, phenols and terpenes were found to be minor compounds Among the varieties, Nielluccio wine recorded highest concentration of total volatile compounds (191.53 mg/L) while, it was least in Caladoc wines (15.45 mg/L). The principal component anal. clearly differentiated Grenache wines based on their relationships between scores and their aroma composition followed by Nielluccio and Cinsuat wines. Out of sixty four compounds, only six aromatic compounds viz. butanediol, isoamyl actate, γ-Terpene, butanol, acetic acid and furfural have satisfying aroma descriptors with floral and fruity nuances and contribute to differentiate the Grenache wines from other varieties which have similar scores in PC1 anal. The cluster anal. also suggested that the wines in the same group (Cinsaut, Tempranillo and Syrah), (Cabernet Franc, Cabernet Sauvignon, Caladoc and Merlot) and (Nielluccio and Petit Verdot) had similar aroma characterization. Grenache wines were well differentiated from the sub group formed by other red varieties.

Journal of Food Science and Technology (New Delhi, India) published new progress about Esters Role: ANT (Analyte), BSU (Biological Study, Unclassified), ANST (Analytical Study), BIOL (Biological Study). 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

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

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