Tag: M.W=100-150

Ji, Ying published the artcileSynthesis of Silico-Phospho-Aluminum Nanosheets by Adding Amino Acid and its Catalysis in the Conversion of Furfuryl Alcohol to Fuel Additives, Safety of Ethyl 4-oxopentanoate, the main research area is silicophospho aluminum furfuryl alc amino acid valorization; amino acids; diethyl ether; ethyl levulinate; furfuryl alcohol; nanosheets.

Self-assembled spheres of silico-phospho-aluminum nanosheets were synthesized with the addition of L-arginine and evaluated as catalysts for the valorization of furfuryl alc. to fuel additives. Adding the amino acid, a bio-derived additive, contributed to higher external sp. surface area and more active sites, featuring a simple, environmentally friendly, and feasible strategy to regulate the growth of nanosheets. Herein, in the reaction of furfuryl alc. with ethanol, the performance of silico-phospho-aluminum nanosheets was significantly improved compared with typical silicon phosphorus aluminum catalyst SAPO-34. The yield of Et levulinate with the use of silico-phospho-aluminum nanosheets was 7.8 times higher than for SAPO-34, and meanwhile the amount of undesirable byproduct di-Et ether was decreased by two orders of magnitude and negligibly produced compared with SAPO-34. Moreover, replacing part of aluminum isopropoxide with aluminum sulfate as aluminum source could introduce sulfate in situ in the process of catalyst synthesis and increase the amount of acid sites on the catalyst.

ChemSusChem 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, Safety of Ethyl 4-oxopentanoate.

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

Kumari, P. Krishna published the artcileNiobium exchanged tungstophosphoric acid supported on titania catalysts for selective synthesis of 5-ethoxymethylfurfural from fructose, SDS of cas: 539-88-8, the main research area is ethoxymethylfurfural preparation titania support tungstophosphoric acid catalyst property.

Various niobium contained tungstophosphoric acid (NbTPA) supported on titania catalysts were prepared and investigated their activity for selective synthesis of 5-ethoxymethylfurfural (EMF) from fructose in ethanol/THF solvent system. Physico-chem. properties of the catalysts were assessed by different spectroscopic approaches like X-ray diffraction, Laser Raman, BET-surface area, FT-IR, pyridine adsorbed FT-IR and temperature programmed desorption of ammonia. The results of characterization direct the existence of firm Keggin ion structure of Nb exchanged TPA and its well dispersed state on support. Lewis acidic sites were induced with the existence of Nb ions. The catalytic activity was interrelated to the catalyst acidity which was liable on the number of Nb ions present in TPA and the amount of NbxTPA supported on TiO2. Among all catalysts 20wt% Nb0.4TPA/TiO2 catalyst showed best catalytic performance toward EMF with a yield of 76% at 130°C after 6 h. The catalyst is recyclable without any depletion of activity.

Molecular Catalysis 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, SDS of cas: 539-88-8.

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

Scott, Gabrielle published the artcileExploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas, Application of Ethyl 3-hydroxybutanoate, the main research area is strawberry cultivar volatile profile sensory physicochem Texas; Fragaria × ananassa; Texas strawberry; descriptive sensory analysis; strawberry cultivation; strawberry flavor; strawberry volatiles.

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p ≤ 0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler.

Journal of Agricultural and Food Chemistry published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Application of Ethyl 3-hydroxybutanoate.

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

Dai, Jinhang published the artcileAdjusting the acidity of sulfonated organocatalyst for the one-pot production of 5-ethoxymethylfurfural from fructose, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is sulfonated polymer organocatalyst fructose conversion ethoxymethylfurfural production.

We report a novel solid organocatalyst, a double-hydrogen-bonded sulfonated polymer catalyst (D-SPC), for the cascade conversion of fructose to 5-ethoxymethylfurfural (EMF) with a highest yield of 68.8 mol% and good catalyst recyclability. We demonstrate that the treatment of a sulfonated nitrogen-containing polymer catalyst (SPC) with dihydroxy acetone (DHA) mols. generates new double hydrogen-bonds (H-bonds) between the ring-attached sulfonic acid groups and DHA by deconstructing the existing H-bonds between the sulfonic acid groups and imine/amine nitrogens of the SPC, which is confirmed by FT-IR spectroscopy, elemental anal., 1H MAS and 13C cross-polarization MAS NMR, XPS, and quantum chem. calculations The 31P MAS NMR, pHsurface, and NH3-TPD of the catalysts reveal the weakening of acidity strength due to the stronger double H-bonding on the D-SPC. Notably, we figure out the inverse relationship between the acidity strength of the catalysts and the EMF yield in the one-pot fructose-to-EMF conversion, wherein the use of weaker acid catalysts accelerates the fructose dehydration while decelerating the side-reaction of furan ring opening, therefore avoiding the neg. influence of water on the tandem reactions. Moreover, the existence of stable double H-bonds contributes to the good catalyst recyclability due to the stabilization of sulfonic acid groups. The acidic property of the solid catalysts could be adjusted by varying the DHA dosage and the preparation conditions of the SPC (i.e., monomer ratio and oxidant dosage), resp. We show that the solid acid catalyst with weaker acidity strength and suitable acidity d. (ca. 2.5 mmol g-1) is favorable for the one-pot synthesis of EMF directly from fructose. This work highlights the application of novel sulfonated polymer catalysts with adjustable acidic property for the highly selective production of EMF, a liquid biofuel candidate, from biomass-derived carbohydrates.

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, Recommanded Product: Ethyl 4-oxopentanoate.

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

Li, Wenke published the artcileHf-based metal organic frameworks as bifunctional catalysts for the one-pot conversion of furfural to γ-valerolactone, Computed Properties of 539-88-8, the main research area is hafnium metal organic framework bifunctional catalyst furfural valerolactone.

One-pot conversion of furfural to the target product γ-valerolactone (GVL) is a challenging and meaningful part of biomass exploitation. Development of heterogeneous catalysts with both Bronsted and Lewis acid properties has proved to be promising and useful because they offer an efficient way to tandem cascade reactions from furfural to GVL. Herein, we successfully synthesized sulfated DUT-67(Hf), a novel bifunctional catalyst, via a post-synthetic modification method. The prepared sulfated DUT-67(Hf) was characterized by XRD, SEM, TEM, N2 adsorption-desorption, Elemental (N, C, H, S) analyses, situ IR spectra of pyridine adsorptions, XPS, FT-IR, TG, and NH3-TPD. The acidity of the catalysts could be adjusted by submersion in different concentrations of aqueous sulfuric acid, giving 0.01 mol/L sulfuric acid for 0.42 mmol/g acidity to 0.1 mol/L sulfuric acid for 2.16 mmol/g acidity. Sulfated DUT-67(Hf) possessed by 0.06 mol/L aqueous sulfuric acid exhibited optimal catalytic activity and showed an 87.1% yield of GVL under the conditions of 180 °C after 24 h of reaction. Moreover, the mechanism of introducing Bronsted acid sites into DUT-67(Hf) and the better hydrogen donors was also investigated through contrasting experiments

Molecular Catalysis 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, Computed Properties of 539-88-8.

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

Feng, Junfeng published the artcileCollaborative Conversion of Biomass Carbohydrates into Valuable Chemicals: Catalytic Strategy and Mechanism Research, Name: Ethyl 4-oxopentanoate, the main research area is biomass carbohydrate valuable chem catalytic strategy mechanism; collaborative conversion; levulinates; lignocellulose; zeolite.

Levulinate is one of the high added-value biomass-derived chems. that is primarily produced from hexoses in cellulose and hemicellulose. Producing levulinate from pentoses in hemicellulose that is extensively distributed in biomass is still highly challenging. In this study, biomass materials and carbohydrates (including cellulose, xylan, glucose, fructose, and xylose) were collaboratively converted into levulinates efficiently over various zeolites with ethanol/dimethoxymethane as cosolvents. The key process for converting pentoses into levulinates is the synthesis of intermediates (furfural) into alkoxy Me furfural via electrophilic substitution or their conversion into furfuryl alc. via in situ hydrogenation. The substitution was achieved by the synergic effect between bifunctional catalysts and cosolvents, which promotes conversion of furfural into alkoxy Me furfural via the electrophilic addition of alkoxy Me radicals. Hydrogenation of furfural into furfuryl alc. was impelled by the cooperative process between in situ generated H-donor from alc. solvents and zeolite catalysts. Moreover, a favorable yield of 21.05 mol % of levulinates was achieved by simultaneous and collaborative conversion of cellulose and hemicellulose with the one-pot process using ethanol/dimethoxymethane as a cosolvent and the zeolite with B and L acid sites as a catalyst.

Journal of Agricultural and Food Chemistry published new progress about Bagasse. 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

Liu, Chenlu published the artcileEsterification of levulinic acid into ethyl levulinate catalyzed by sulfonated bagasse-carbonized solid acid, Related Products of esters-buliding-blocks, the main research area is levulinic acid esterification ethyl levulinate sugarcane bagasse sulfonated carbon.

A sulfonic carbon-based catalyst (C-SO3H) was successfully prepared by sulfonating incompletely carbonized sugarcane bagasse. The optimized catalyst of high activity in the esterification of levulinic acid (LA) with ethanol was produced under sulfonation at 150 °C for 15 h with a 75 mL/g sulfonation ratio. The prepared catalysts were characterized by X-ray powder diffraction (XRD), Fourier transform IR (FTIR) anal., SEM (SEM), and elemental anal. (EA). The bagasse-carbonized catalyst was porous, and the porous structure remained unchanged after sulfonation treatment. Moreover, the introduced acidic group was the catalytic center. A high yield of Et levulinate (ELA) of 88.2% was obtained at 120 °C for 9 h. The sulfonic carbon-based catalyst could be reused at least five times and still exhibited great stability. The application of the sulfonic carbon-based catalyst was not only the effective use of biomass resources but also promoted the production of various high value chems.

BioResources published new progress about Bagasse. 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

Zhao, D. published the artcileEfficient transfer hydrogenation of alkyl levulinates to γ-valerolactone catalyzed by simple Zr-TiO2 metal oxide systems, Related Products of esters-buliding-blocks, the main research area is zirconium titania metal oxide system ethyl levulinate valerolactone hydrogenation.

Zr-TiO2 synthesized heterogeneous catalysts could efficiently convert Et levulinates (ELs) to γ-valerolactone (GVL) using isopropanol (2-PrOH) as H-donor. Obtained catalysts were characterized by X-ray diffraction (XRD), XPS, Scanning electron microscope (SEM), High revolution transmission electron microscope (HR-TEM), Fourier transform IR spectroscopy (FT-IR), inductively coupled plasma optical emission spectroscopy (ICP-OES), NH3/CO2 temperature programmed desorption (NH3/CO2-TPD), pyridine-IR spectroscopy, H2 temperature-programmed reduction (H2-TPR), and N2 adsorption and desorption measurements. In total, 10 wt% Zr-TiO2 with average nanoparticle sizes (ca. 4-6 nm) exhibited optimum catalytic activity after optimization of reaction temperature, reaction time, catalyst loading, as well as solvent effect. GVL yield reached 74% with 79% EL conversion at 190°C for 5 h over 10 wt% Zr-TiO2 in 2-PrOH. The high catalytic activity could be attributed to an appropriate proportion of acidic/basic sites, high Bronted/Lewis acid ratio, and large surface areas. Both acidic and basic sites lead to a synergistic effect on the concurrent activation of H-donor and substrate. The major side product Et 4-hydroxypentanoate (EHP) and other byproducts were found. GVL yield achieved from Me levulinate (ML) and levulinic acid (LA) were 65% and 20%, resp. Catalyst deactivation was observed due to coke deposits on the catalyst’s surface. The spent catalyst proved to be reusable to recover almost completely its initial activity after calcination (300°C, 2 h). A plausible reaction mechanism is presented on the basis of characterization results.

Materials Today Chemistry 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

Hu, Lei published the artcileHighly selective hydrogenation of biomass-derived 5-hydroxymethylfurfural into 2,5-bis(hydroxymethyl)furan over an acid-base bifunctional hafnium-based coordination polymer catalyst, Product Details of C7H12O3, the main research area is hafnium coordination catalyst HMF transfer hydrogenation.

The catalytic transfer hydrogenation (CTH) pathway is a promising and appealing method for the selective hydrogenation of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-bis(hydroxymethyl)furan (BHMF) via the Meerwein-Ponndorf-Verley (MPV) reaction, in which the development of effective and economical catalysts is of great significance. Herein, this work designed and prepared a new hafnium-based metal-organic coordination polymer (Hf-DTMP) by the simple assembly of hafnium tetrachloride (HfCl4) and diethylene triaminepenta(methylene phosphonic acid) (DTMP). Comprehensive studies demonstrated that Hf-DTMP is an amorphous and mesoporous catalyst with a strong acid-base bifunctionality, and so, it displayed excellent catalytic activity for the CTH of HMF into BHMF with a high yield of 96.8% in 2-butanol (sBuOH) at a moderate reaction temperature of 130 °C for 4 h. In addition, Hf-DTMP exhibited good heterogeneity, reusability and stability, and it could be easily recovered from the reaction mixture by filtration and consecutively used for at least 5 recycles without a dramatic loss in catalytic activity. More gratifyingly, Hf-DTMP also showed superior universality for the CTH of 5-methylfurfural (MF), furfural (FF), levulinic acid (LA), Et levulinate (EL) and cyclohexanone (CHN) into the corresponding products with high yields, obviously indicating that it has tremendous potential for the selective hydrogenation of various biomass-derived carbonyl compounds

Sustainable Energy & Fuels 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, Product Details of C7H12O3.

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

Gupta, Dinesh published the artcileTopotactic transformation of homogeneous phosphotungastomolybdic acid materials to heterogeneous solid acid catalyst for carbohydrate conversion to alkyl methylfurfural and alkyl levulinate, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is phosphotungastomolybdic acid carbohydrate catalytic dehydration etherication.

The strong interaction of higher transition metal oxides with inorganic non-metals can be promising for generating highly acidic three-dimensional materials by design. A comprehensive controlled acidity of heteropolyacid-like catalyst and interpretation of the microstructure and mechanism of the formation of a versatile heterogeneous solid acid catalyst, HPW4Mo10Ox has been heterogenized by biomass-derived cystine as organic linkers to control the acidity of as-synthesized materials, which have greater acidity and complexity in separation from the reaction mixture The new and unique results obtained in catalysis done in biphasic reaction. Cystine binds to the surface of HPW4Mo10Ox, and the topotactic transition occurred, change the morphol. and lattice parameter. We described here a sustainable transformation of highly acidic (0.84 mmol g-1) heteropoly acid (HPW4Mo10Ox) to cystine anchored on the active surface of the heteropoly acid and controlled the acidity (0.63 mmol g-1) and heterogenized the materials. As synthesized materials have been showing that for the direct formation of alkyl levulinate and furanics intermediate from carbohydrates. HPW4Mo10Ox and HPW4Mo10Ox-Cys, act as acidic catalyst, and catalyze the mono- and disaccharides that are dissolved in primary and secondary alcs. to alkyl levulinate (AL) and alkyl methylfurfural at 170°C under microwave irradiation with glucose as the substrate, AL yield reaches 62% with 84.95% selectivity. The catalyst can be easily recovered by filtration and min. five times reused after calcination without any substantial change in the product selectivity. The anal. anal. of as-synthesis materials done by NH3-TPD, BET, XRD, FESEM, TEM, HRTEM, FTIR, ATR, TGA, DTA to stabilized the morphol. and acidity controlled mechanism.

RSC Advances 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