Category: 539-88-8

de Andrade Neves, Nathalia published the artcileChemical composition of jabuticaba (Plinia jaboticaba) liquors produced from cachaca and cereal alcohol, Quality Control of 539-88-8, the main research area is Plinia jaboticaba liquor cachaca cereal alc volatile composition.

Jabuticaba (Plinia jaboticaba (DC) Berg.) is considered one of the main Brazilian sources of anthocyanins. It is widely recognized and popular, with its consumption occurring in fresh forms and through processed products. Although popular, jabuticaba liquors are handmade, on a small-scale, with little quality control and a lack of standardization. This study aimed to evaluate the effect of the ethanol source (cachaca and cereal alc.) on the chem. characteristics of jabuticaba liquors. The beverages were evaluated considering the contents of sugars, ethanol, anthocyanins, ellagic acid, amino acids, biogenic amines, organic acids, and volatile composition The liquors showed similar chem. compositions, which differs from the content of anthocyanins and the volatile composition The liquor made from cachaca showed a greater complexity of aroma, including terpenes and volatile phenolic compounds, and a higher d.p. of anthocyanins. This study is the first published for jabuticaba liquors.

LWT–Food Science and Technology published new progress about Acidity. 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

Li, Xiaoning published the artcileZr-DBS with Sulfonic Group: A Green and Highly Efficient Catalyst for Alcoholysis of Furfuryl Alcohol to Ethyl Levulinate, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is zirconium dodecylbenzenesulfonate alcoholysis catalyst furfuryl alc ethyl levulinate; green chem synergetic effect.

The alcoholysis of furfuryl alc. (FA) produce Et levulinate (EL) plays a crucial role in the field of biomass conversion. In this work, a novel Zr-base catalyst with sulfonic groups in its structure was prepared by the co-precipitation of sodium dodecyl benzene sulfonate and ZrOCl2 (Zr-DBS) under non-toxic conditions. It was found that Zr-DBS has an excellent catalytic performance for this reaction and an EL yield of 95.27% could be achieved. Besides, Zr-DBS could be easily separated from the reaction system and reused at least four times without a significantly decrease in activity. Meanwhile, Zr-DBS was characterized by Fourier transform IR spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES) and temperature-programmed desorption of ammonia (NH3-TPD). The main reason for the high catalytic activity of the Zr-DBS was that the synergetic effects of Lewis and Bronsted acid sites and appropriate textural properties.

Catalysis Letters published new progress about Acidity. 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

Gupta, Shyam Sunder R. published the artcileCatalytic conversion of furfuryl alcohol or levulinic acid into alkyl levulinates using a sulfonic acid-functionalized hafnium-based MOF, HPLC of Formula: 539-88-8, the main research area is catalyst furfuryl alc levulinic acid alkyl levulinate sulfonate hafnium; zirconium catalyst furfuryl alc alkyl levulinate esterification.

Biomass conversion using reusable solid acid catalysts are highly desirable to comply with the principles of green chem. Here, we report a sulfonic acid-functionalized hafnium-based metal-organic framework (MOF), UiO-66(Hf)-SO3H, as an efficient solid acid catalyst for the alcoholysis of furfuryl alc. (FA) and esterification of levulinic acid (LA) affording alkyl levulinates (ALs). Among the as prepared UiO-66 based MOFs(UiO-66(Hf), UiO-66(Hf)-NH2, UiO-66(Hf)-SO3H and UiO-66(Zr)-SO3H), UiO-66(Hf)-SO3H holds highest Bronsted acidity and therefore exhibits excellent catalytic activity towards production of ALs. The highest Bronsted acidity in UiO-66(Hf)-SO3H is the result of the covalently bound sulfonic acid groups present inorganic linkers along with the ligated hydroxyl groups (Hf-μ3-OH) to the Hf metal clusters.

Catalysis Communications published new progress about Acidity. 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

Vasquez, Paola Blair published the artcileGas-Phase Catalytic Transfer Hydrogenation of Methyl Levulinate with Ethanol over ZrO2, COA of Formula: C7H12O3, the main research area is gas phase catalytic hydrogenation methyl levulinate ethanol zirconia.

This paper reports about the gas-phase reduction of Me levulinate to γ-valerolactone (GVL) via catalytic transfer hydrogenation using ethanol as the H-donor. In particular, high-surface-area, tetragonal zirconia has proven to be a suitable catalyst for the reaction. Under optimized conditions, the reaction is selective toward the formation of GVL (yield 70%). However, both the deposition of heavy oligomeric compounds over the catalytic surface and the progressive conversion from Lewis to Bronsted acidity, due to the reaction with the water formed in situ, led to a progressive change in the chemo-selectivity, promoting side reactions, e.g. the alcoholysis of angelica lactones to Et levulinate. However, the in situ regeneration of the catalyst performed by feeding air at 400 °C for 2 h permitted an almost total recovery of the initial catalytic behavior, proving that the deactivation is reversible. The reaction has been tested also using a true bioethanol, derived from agricultural waste.

ACS Sustainable Chemistry & Engineering published new progress about Acidity. 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

Song, Daiyu published the artcileDesign of periodic mesoporous sulfonic acid and titanium bi-functionalized alkyl-bridged organosilica hybrid catalysts for efficient synthesis of ethyl levulinate, Related Products of esters-buliding-blocks, the main research area is propylsulfonic arenesulfonic acid titanium silica hybrid catalyst ethyl levulinate.

A series of periodic mesoporous propylsulfonic/arenesulfonic acid and titanium bi-functionalized ethyl/phenyl-bridged organosilica hybrid catalysts, Pr/ArSO3H-Si(Et/Ph)Si-Ti, with controllable Ti loadings are prepared by a nonionic surfactant-templated sol-gel co-condensation route under acidic media and carefully adjusted silicon-to-titanium molar ratios in the initial preparation systems. As-prepared hybrid catalysts with both Bronsted and Lewis acid natures, excellent porosity properties and surface hydrophobicity exhibit excellent catalytic activity in the synthesis of Et levulinate, a promising fuel blend, from the esterification of levulinic acid with ethanol, and the esterification activity is closely related to Ti loading or SO3H group-to-Ti molar ratio as well as the structures of the incorporated sulfonic acid groups and bridging organic units. Addnl., the catalysts can be reused for three times without any activity loss, attributing to covalent bonding the organosulfonic acid groups and Ti(IV) species with the silica/carbon framework.

Microporous and Mesoporous Materials published new progress about Acidity. 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

He, Jiang published the artcileZeolite-Tailored Active Site Proximity for the Efficient Production of Pentanoic Biofuels, HPLC of Formula: 539-88-8, the main research area is zeolite bifunctional catalyst proximity effect pentanoic acid biofuel; bifunctional catalysis; biomass conversion; hydrodeoxygenation; proximity; zeolites.

Biofuel production can alleviate reliance on fossil resources and thus carbon dioxide emission. Hydrodeoxygenation (HDO) refers collectively to a series of important biorefinery processes to produce biofuels. Here, well-dispersed and ultra-small Ru metal nanoclusters (ca. 1 nm), confined within the micropores of zeolite Y, provide the required active site intimacy, which significantly boosts the chemoselectivity towards the production of pentanoic biofuels in the direct, one-pot HDO of neat Et levulinate. Crucial for improving catalyst stability is the addition of La, which upholds the confined proximity by preventing zeolite lattice deconstruction during catalysis. We have established and extended an understanding of the “”intimacy criterion”” in catalytic biomass valorization. These findings bring new understanding of HDO reactions over confined proximity sites, leading to potential application for pentanoic biofuels in biomass conversion.

Angewandte Chemie, International Edition published new progress about Acidity. 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

Nie, Yifan published the artcileSynthesis of mesoporous sulfonated carbon from chicken bones to boost rapid conversion of 5-hydroxymethylfurfural and carbohydrates to 5-ethoxymethylfurfural, Quality Control of 539-88-8, the main research area is mesoporous sulfonated carbon chicken bone boost hydroxymethylfurfural carbohydrate ethoxymethylfurfural.

Sulfonated carbon material is an important class of catalysts, but controllable preparation of high-performance materials for biomass transformations is still challenging. Here, we demonstrate an effective strategy to prepare mesoporous sulfonated carbon materials from chicken bones to convert carbohydrates to 5-ethoxymethylfurfural (EMF). The carbonization of chicken bones without using addnl. templates gave hierarchical porous carbon materials. The subsequent sulfonation by chem. reduction approach introduced 2.33 mmol/g of -PhSO3H group, reserved abundant mesopores but blocked micropores. The sulfonated carbon materials afforded EMF yields of 94.7% and 68.6% from 5-hydroxymethylfurfural (HMF) and fructose in ethanol within 1.5 h and 2 h, resp., without using high b.p. co-solvents. Furthermore, the apparent activation energies for HMF and fructose conversion were 29.1 and 49.5 kJ/mol, resp. The catalyst could be reused four times with EMF yield decreasing from 68.6% to 62.7%.

Renewable Energy published new progress about Acidity. 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

Guo, Haixin published the artcileSynthesis of ethyl levulinate over amino-sulfonated functional carbon materials, Formula: C7H12O3, the main research area is ethyl levulinate preparation amino sulfonated functional carbon catalyst.

Functional carbon materials (FCM) containing amino and sulfonate groups (NS-FCM) were prepared with one-pot hydrothermal carbonization of cellulose using ammonium formate and 5-sulfosalicylic acid additives. The catalytic materials were applied to levulinic acid or furfuryl alc. substrates in ethanol solvent for synthesizing Et levulinate (EL). Catalytic activity of NS-FCM was found to be related to its sulfonate groups, while substrate selectivity of NS-FCM was found to be related to its amino groups as supported by equilibrium adsorption and reaction experiments Pre-adsorbed LA substrate onto NS-FCM followed by ethanol treatment at reaction conditions achieved EL yields higher than 90% that is attributed to a selective adsorption and cooperative desorption mechanism. The activity of NS-FCM catalyst was stable for five reuse cycles, but lost about 10% of its activity from the third cycle that is attributed to adsorption of humin precursors onto active sites.

Renewable Energy published new progress about Acidity. 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

Pavlovic, J. published the artcileCatalytic activity of SnO2- and SO4/SnO2-containing clinoptilolite in the esterification of levulinic acid, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is catalytic SnO2 SO4 clinoptilolite esterification levulinate Zeolitic tuff.

Catalysts based on natural zeolite – clinoptilolite loaded with either SnO2 (TOHCLI) or sulfated SnO2 (STOHCLI) were prepared and tested in the esterification of levulinic acid (LA) with octanol or ethanol. The Sn content in TOHCLI and STOHCLI varied from 4.5 to 12.3 weight%. The catalysts were characterized by powder X-ray diffraction method, SEM coupled with energy dispersive X-ray spectroscopy, thermal anal., XPS, N2 physisorption at -196 °C, 27Al and 29Si MAS NMR solid state spectroscopy and FTIR spectroscopy for anal. of acidic centers. A high conversion rate of LA into octyl- (OLA) or Et levulinate (ELA) was obtained for both TOHCLI and STOHCLI. TOHCLI showed a high activity in the conversion of LA into OLA (55%) and a moderate activity in the conversion to ELA (22%). STOHCLI led to a total conversion of LA to OLA and ELA due to the presence of a high amount of Bronsted and Lewis acid sites in the catalysts. The catalytic activity decreased to 86% for OLA and to 66% for ELA after next five cycles. Lower catalytic activity in the repeated cycles during ELA formation was explained by pore blockage due to coke formation.

Microporous and Mesoporous Materials published new progress about Acidity. 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

Bosilj, Monika published the artcileFunctionalising hydrothermal carbons for catalysis – investigating solid acids in esterification reactions, HPLC of Formula: 539-88-8, the main research area is hydrothermal carbon catalyst solid acid esterification reaction.

A simple and controllable acid functionalized catalyst synthesis is presented based on the hydrothermal carbonisation (HTC) of glucose in the presence of the structure directing agent sodium borate. This synthetic strategy in combination with a post-thermal carbonisation step allows direction of porosity/sp. surface area, and HTC xerogel material functionality. All these parameters influence the introduction of S-containing functional groups (e.g. acidity) to the xerogel. The prepared acid functionalized HTC materials were characterized via N2 sorption, back titration, elemental anal., XPS, ATR FT-IR, and SEM, with their applicability as solid acids assessed through model esterification reactions of different organic acids (e.g. short alkyl chain and aromatic systems). An S-functionalized HTC catalyst described in this study with a high sp. surface area and porosity (502 m2 g-1; 0.42 cm3 g-1), and a loading of 1.1 mmol g-1 SO3H/SO42- acid sites (from a 2.7 mmol g-1 of total acid groups) was found to have comparable catalytic activities as com. Amberlyst-36 catalyst in all the investigated esterification reactions. Catalyst re-usability under the applied batch conditions was improved by heating the catalyst at higher temperatures in order to remove deposited organic acids and their derivatives The concept presented provides a basis for further development and optimization of HTC supported catalysts in acid and other catalysis.

Catalysis Science & Technology published new progress about Acidity. 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