Tag: M.W=100-150

Zheng, Hongyan published the artcileSynthesis of methyl glycolate via low-temperature hydrogenation of dimethyl oxalate over an efficient and stable Ru/activated carbon catalyst, Synthetic Route of 623-50-7, the main research area is ruthenium activated carbon catalyst dimethyl oxalate hydrogenation methyl glycolate.

Syngas to di-Me oxalate (DMO) followed by hydrogenation to Me glycolate (MG) is considered to be an environmentally friendly and economical route. However, the catalyst with super performance and low cost for this route is still challenging. In this work, a simple and low-lost fabrication method was developed to prepare a Ru/activated carbon (AC) catalyst and was used for DMO hydrogenation to MG under mild reaction conditions. The Ru/AC catalyst showed the best performance in the low-temperature hydrogenation of DMO to MG compared to Ru/SiO2 and Ru/Al2O3. A series of characterization results showed that the super catalytic properties of Ru/AC catalyst might be attributed to the higher dispersion of Ru on support and its smallest nanoparticles size, weak surface acidity and electron-deficient state of Ru species. The key parameters such as Ru loading, temperature, weight hourly space velocity, and pressure, were comprehensively investigated. MG selectivity of 94.6% with DMO conversion of 97.2% were obtained over the 4.0 Ru/AC catalyst at 90°C. The 4.0Ru/AC catalyst showed excellent stability and there was no obvious deactivation after 1032 h test. The Ru/AC catalyst is effective for the DMO hydrogenation to MG under mild conditions and has great promise for industrial applications because of its low cost, simple preparation, high efficiency, and long life. 2022 Society of Chem. Industry (SCI).

Journal of Chemical Technology and Biotechnology published new progress about Hydrogenation. 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

Wang, Yazhou published the artcileEffect of Phosphorus Precursor, Reduction Temperature, and Support on the Catalytic Properties of Nickel Phosphide Catalysts in Continuous-Flow Reductive Amination of Ethyl Levulinate, Formula: C7H12O3, the main research area is nickel phosphide ethyl levulinate reductive amination catalyst; N-alkyl-5-methyl-2-pyrrolidone; ethyl levulinate; flow reactor; molecular hydrogen; nickel phosphide; phosphorus precursor; reduction temperature; reductive amination; support effect.

Levulinic acid and its esters (e.g., Et levulinate, EL) are platform chems. derived from biomass feedstocks that can be converted to a variety of valuable compounds Reductive amination of levulinates with primary amines and H2 over heterogeneous catalysts is an attractive method for the synthesis of N-alkyl-5-methyl-2-pyrrolidones, which are an environmentally friendly alternative to the common solvent N-methyl-2-pyrrolidone (NMP). In the present work, the catalytic properties of the different nickel phosphide catalysts supported on SiO2 and Al2O3 were studied in a reductive amination of EL with n-hexylamine to N-hexyl-5-methyl-2-pyrrolidone (HMP) in a flow reactor. The influence of the phosphorus precursor, reduction temperature, reactant ratio, and addition of acidic diluters on the catalyst performance was investigated. The Ni2P/SiO2 catalyst prepared using (NH4)2HPO4 and reduced at 600°C provides the highest HMP yield, which reaches 98%. Although the presence of acid sites and a sufficient hydrogenating ability are important factors determining the pyrrolidone yield, the selectivity also depends on the specific features of EL adsorption on active catalytic sites.

International Journal of Molecular Sciences published new progress about Nanoparticles. 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

Barbaro, Pierluigi published the artcileSustainable Catalytic Synthesis for a Bio-Based Alternative to the Reach-Restricted N-Methyl-2-Pyrrolidone, Formula: C7H12O3, the main research area is aquivion support platinum heterogeneous catalyst preparation nanostructure; ethyl levulinate heptylamine platinum catalyst one pot reductive amination; methyl pyrrolidone preparation.

A variety of bifunctional catalysts are prepared combining immobilized metal nanoparticles and acid solid materials featuring Lewis or Bronsted acidity was reported. The catalytic systems are tested in the reductive amination of bio-derived levulinates with primary amines, using hydrogen as clean reducing agent, to obtain N-substituted-5-methyl-2-pyrrolidones, which were proposed as substitutes for the widely used, REACH-restricted solvent N-methyl-2-pyrrolidone. The overall process was studied in depth to identify the best combination of metal and acid functionalities to be used in one-pot and one stage. Pt immobilized onto the Bronsted solid acid Aquivion is shown to be the most efficient catalyst, with a productivity of N-heptyl-5-methyl-2-pyrrolidone of 7.9 mmolgcat-1 h-1 reached at full conversion and 98.6% selectivity, under 120°C, 4 bar H2 pressure and solvent-free conditions.

Advanced Sustainable Systems published new progress about Nanoparticles. 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

Ahmad, Ejaz published the artcileSynthesis and application of TiO2-supported phosphotungstic acid for ethyl levulinate production, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is ethyl levulinate synthesis titania supported phosphotungstic acid catalyst.

The present study investigates synthesis, characterization, and application of TiO2 supported Keggin phosphotungstic acid in biorenewable transformations. In particular, 10 wt%, 20 wt%, 30 wt% and 40 wt% Keggin phosphotungstic acid was loaded over TiO2 support via wet impregnation method to prepare EPTN-1, EPTN-2, EPTN-3, and EPTN-4 catalysts, resp. After this, synthesized catalysts were tested in a microwave reactor to measure reactivity trend in order HPW > EPTN-4 > EPTN-3 > EPTN-2 > EPTN-1. A maximum 95% levulinic acid (LA) conversion was measured in the presence of 72 mg EPTN-4 catalyst, two mmol LA in 1:42 LA: EtOH (ethanol) molar ratio at 393 K in 120 min at a stirring speed of 300 rpm. No significant loss in heterogenized EPTN-4 catalyst was measured after five application cycles. A detailed characterization of synthesized catalyst showed that the Keggin structure remained intact after heterogenization.

Materials Science for Energy Technologies published new progress about Particle size. 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

Parpinello, Giuseppina Paola published the artcileComparison of Sangiovese wines obtained from stabilized organic and biodynamic vineyard management systems, Recommanded Product: Ethyl 3-hydroxybutanoate, the main research area is Sangiovese wine organic biodynamic vineyard management; Bioactive compounds; Biodynamic; Organic; Sensory evaluation; Volatiles compounds; Wine sustainability.

Sangiovese red wines produced from organic (ORG) and biodynamic (BDN) vineyards over two consecutive vintages (2011 and 2012) were compared for chem. and sensory parameters to investigate a sustainable approach to grape production The effects of management practice, vintage, and their interaction were investigated. The ORG wines showed higher total acidity and lower volatile acidity and pH. Although trained panelists highlighted some differences in astringency and odor complexity between ORG and BDN wines, consumers had no preference. The concentrations of anthocyanins, phenolic and cinnamic acids, and flavonols, as well as color components, did not differ-contrary to results from the conversion period from ORG to BDN (2009 and 2010) in the same vineyard (Parpinello, Rombola,́ Simoni, & Versari, 2015). Together, these two studies demonstrate that ORG and BDN wine characteristics tend to be similar after the first year of conversion, indicating that the BDN method can produce high-quality Sangiovese wine.

Food Chemistry published new progress about Wine analysis. 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

Issa-Issa, Hanan published the artcileAroma-active compounds, sensory profile, and phenolic composition of Fondilloń, Recommanded Product: Ethyl 3-hydroxybutanoate, the main research area is volatile grape aroma; Alicante wines; Aroma extract dilution analysis (AEDA); Gas chromatography-olfactometry (GC-O); Oxidized wines; Phenylethyl alcohol; Solvent-assisted flavor evaporation (SAFE).

The Fondilloń is a wine made from overripe grapes of the Monastrell variety, which is characterized by a high alc. content and a min. barrel ageing of 10 years. The objective of this study was to analyze the Fondilloń volatile composition, key aroma-active compounds, sensory profile and phenolic composition Fifty-four volatile compounds were identified, quantified and classified as alcs., esters, acids, aldehydes, lactones, phenols, hydrocarbons and ketone. From these compounds, 22 aroma-active compounds were identified, with phenylethyl alc., di-Et succinate and Et lactate having the highest flavor dilution factor. The Fondilloń wines were characterized by having high intensity of alc., fruity and toasted odor and flavor notes, and long aftertaste. Besides, 25 phenolic compounds were also identified and quantified; the phenolic acids (gallic, protocatechuic and syringic acids) were the predominant phenolic compounds

Food Chemistry published new progress about Food analysis. 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

Wang, Zixin published the artcileAmberlyst-15 supported zirconium sulfonate as an efficient catalyst for Meerwein-Ponndorf-Verley reductions, Synthetic Route of 539-88-8, the main research area is Amberlyst zirconium sulfate Meerwein Ponndorf Verley reduction.

The Meerwein-Ponndorf-Verley (MPV) reaction is an important chemoselective route for carbonyl group hydrogenation, and thus designing new and effective catalysts for this transformation remains important and challenging. In this work, a new sulfonate coordinated Zr(IV) catalyst was prepared by the coordination of Zr(IV) onto the sulfonate groups of Amberlyst-15, which can effectively catalyze the MPV reaction and quant. convert carbonyl compounds to the corresponding alcs. with high reactivity and stability. Detailed mechanistic investigations reveal that the catalytic performance of Zr-AIER can be attributed to the synergetic effect between Zr4+ and the sulfonate group, and the porous structure with high surface area.

Chemical Communications (Cambridge, United Kingdom) published new progress about Heterogeneity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.

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

Ma, Mingwei published the artcileA highly efficient Cu/AlOOH catalyst obtained by in situ reduction: Catalytic transfer hydrogenation of ML into γ-GVL, Related Products of esters-buliding-blocks, the main research area is levulinate ester catalytic transfer hydrogenation copper aluminum oxyhydroxide nanocatalyst.

Catalytic transfer hydrogenation (CTH) of carbonyl compounds is considered as one of the most promising processes in the synthesis of fuels and chems. In this work, we propose a one-step strategy for catalyst preparation and CTH. Using the strategy, the production of γ-valerolactone (γ-GVL) was performed with isopropanol (2-PrOH) as solvent over in situ reduced nano-Cu/AlOOH catalyst from Cu2(OH)2CO3/AlOOH and the optimal reaction conditions for γ-GVL are 180 °C for 5 h using the in situ reduced catalyst with Cu/Al molar ratio 3/1 (90.51% yields of γ-GVL). Furthermore, it has been confirmed by different characterization methods (such as: SEM, TEM, XPS, etc.) that the catalyst is heterogeneous and exhibits high catalytic activity and stability which is attributed to the stability of the zero-valent copper in the catalyst and the nanosized particles of the catalyst. In addition, the catalysts also show general applicability to other carbonyl compounds

Molecular Catalysis published new progress about Heterogeneity. 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

Sung, Kihyuk published the artcileIr(triscarbene)-catalyzed sustainable transfer hydrogenation of levulinic acid to γ-valerolactone, SDS of cas: 539-88-8, the main research area is iridium catalyst sustainable transfer hydrogenation levulinic acid valerolactone.

Sustainable iridium-catalyzed transfer hydrogenation using glycerol as the hydride source was employed to convert levulinic acid to γ-valerolactone (GVL) with exceptionally high turnover numbers (TONs) (500,000) and turnover frequencies (TOFs) (170,000 h-1). The highly efficient triscarbene-modified iridium catalysts demonstrated good catalytic activities with low catalyst loadings (0.7 ppm) and good recyclability with an accumulated TON of over two million in the fourth reaction. In addition to glycerol, propylene glycol (PG), ethylene glycol (EG), isopropanol (IPA), and ethanol (EtOH) successfully transferred hydrides to levulinic acid, producing GVL with TONs of 339,000 (PG), 242,000 (EG), 334,000 (IPA), and 208,000 (EtOH), resp. Deuterium-labeling experiments were conducted to gain insight into the reaction mechanism.

Applied Organometallic Chemistry published new progress about Hydrogenation. 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

Zhao, Tingting published the artcileSpecific role of aluminum site on the activation of carbonyl groups of methyl levulinate over Al(OiPr)3 for γ-valerolactone production, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is valerolactone methyl levulinate production aluminum isopropoxide activation.

The high-efficiency synthesis of biofuel γ-valerolactone (GVL) from biomass-derived levulinates is a challenging task. The Meerwein-Ponndorf-Verley (MPV) reduction with its extraordinary chemoselectivity is advantageous for the hydrogenation process, compared to the mol.-hydrogen-based process using noble metal catalysts. Therefore, we used a classical Al-based isopropoxide to catalyze transfer hydrogenation (CHT) of Me levulinate (ML) to GVL. A high yield of GVL up to 97.6% could be achieved using 2-proponal as the H-donor and solvent under mild conditions (150°C, 30 min). Besides, three reaction stages were observed in the conversion, including transesterification, hydrogenation and cyclization. LC/MS anal. and the d. functional theory (DFT) caculations revealed that Al atom of Al(OiPr)3 as the electron transfer center activated ester carbonyl of the substrate via fourmembered transition states before activating the ketone carbonyl, resulting in the occurrence of transesterification prior to the hydrogenation. In addition, 2-propanol as proton transfer carrier assisting the cyclization process was proved to be the lowest-energy pathway. Our work shed light on the role of Al(OiPr)3 in the MPV reduction of ML, providing a comprehensive understanding on the metal alkoxide catalysis mechanism for GVL production

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Hydrogenation. 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