Category: 539-88-8

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

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

Deng, Tianyu published the artcileContinuous Hydrogenation of Ethyl Levulinate to 1,4-Pentanediol over 2.8Cu-3.5Fe/SBA-15 Catalyst at Low Loading: The Effect of Fe Doping, Quality Control of 539-88-8, the main research area is hydrogenation ethyl levulinate pentanediol catalyst iron doping; copper; doping; heterogeneous catalysis; hydrogenation; iron.

Bimetallic Cu-Fe catalysts with low loading were prepared for hydrogenation of Et levulinate (EL) to 1,4-pentanediol (1,4-PDO). Among them, 2.8Cu-3.5Fe/SBA-15 (Cu/Fe molar ratio of 1:1.5) performed best, capable of converting EL to the key intermediate γ-valerolactone (GVL) at 140 °C with 97 % yield. It can also be used to hydrogenate GVL to 1,4-PDO with 92.6 % selectivity or convert EL to 1,4-PDO in one pot. The high activity of the catalyst at such a low loading was attributed to the highly dispersed metal species and the Fe doping effect. Various characterization methods indicated that Fe acted as both structural and electronic modifier to promote the chem. properties of the Cu species. Besides, the incorporation of Fe provided abundant Lewis acid sites and accelerated the reaction process. CuFeO2 was detected by energy-dispersive X-ray spectroscopy, XPS, and XRD. On the basis of a combination of characterization and reaction kinetics, synergistic catalysis by Cu0 and CuFeO2 is considered to be responsible for the excellent performance of the Cu-Fe catalysts.

ChemSusChem 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, Quality Control of 539-88-8.

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

Shao, Yuewen published the artcileSelective production of valerolactone or 1,4-pentanediol from levulinic acid/esters over Co-based catalyst and importance of synergy of hydrogenation sites and acidic sites, Category: esters-buliding-blocks, the main research area is magnesium cobalt catalyst ethyl levulinate hydrogenation valerolactone pentanediol.

γ-Valerolactone (GVL) or 1,4-pentanediol (1,4-PDO) are the value-added chems., selectivities of which from conversion of levulinic acid/ester depend on balanced distribution of metallic sites and other active sites of the catalysts. In this study, Co-based catalysts with various precursors of LDH structures were synthesized to investigate the roles of hydrogenation, acidic and basic sites in the formation of GVL and 1,4-PDO from Et levulinate (EL). The results indicated that Al in Co-Mg-Al or Co-Al created acidic sites and facilitated cobalt dispersion by developing porous structures and strong interaction with Co species. Kinetic study indicated that the conversion of GVL controlled the formation rate of 1,4-PDO from EL. The superior catalytic activity and recyclability were observed over Co-Mg-Al and Co-Al catalysts, with the selectivity of both of GVL and 1,4-PDO reaching 98%, which was equivalent or superior to noble-metal based catalysts. Bronsted acidic sites in catalyst could facilitate the lactonization of Et 4-hydroxyvalerate to GVL and the ring-opening of GVL to 1,4-PDO, by cooperating with hydrogenation sites. Lewis acidic sites improved the adsorption of substrates and reaction intermediates, accelerating the ring-opening of GVL. The synergy between acidic sites together with hydrogenation sites was the key for achieving the excellent catalytic performance.

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, Category: esters-buliding-blocks.

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

Hsiao, Chia-Yu published the artcileA comparative study on microwave-assisted catalytic transfer hydrogenation of levulinic acid to γ-valerolactone using Ru/C, Pt/C, and Pd/C, Synthetic Route of 539-88-8, the main research area is levulinic acid hydrogenation valerolactone synthesis ruthenium platinum palladium catalyst.

Conversion of levulinic acid (LA) to γ-valerolactone (GVL) via catalytic transfer hydrogenation (CTH) using conventional heating (CH) involves long reaction times, and low yields. Microwave (MW) heating seems a solution to address these issues as MW accelerates reactions and enhances yields. In this study, three typical catalysts, Ru/C, Pt/C and Pd/C, are compared for LA conversion using MW heating. In comparison to CH processes, MW-assisted processes significantly enhance LA conversion to GVL with higher yields by Ru/C and Pt/C. While elevated temperatures and secondary alcs. are favorable for LA conversion by these catalysts, Ru/C appears as the most effective catalyst as it can reach LA conversion as 100%, selectivity of GVL as 99% and yield of GVL as 99% at 160°C. The results of this study confirm that MW was a promising process for enhancing LA conversion and Ru/C shows the highest catalytic activity, followed by Pt/C and Pd/C.

Chemical Engineering Communications 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, Synthetic Route of 539-88-8.

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

Jiang, Liang published the artcileA nitrogen-doped carbon modified nickel catalyst for the hydrogenation of levulinic acid under mild conditions, Synthetic Route of 539-88-8, the main research area is levulinic acid hydrogenation gamma valerolactone carbon modified nickel alumina.

The conversion of levulinic acid (LA) to γ-valerolactone (GVL) is 1 of the most important reactions from biomass-derived platform chems. to value-added chems. N-doped C was introduced into a Ni/Al2O3 catalyst and was employed for the hydrogenation of LA to GVL with a full conversion and equivalent yield under mild conditions, at as low as ambient H pressure and 130° for 6 h. The doping of N introduced NiNx species and the imperfection of modified N-doped C were beneficial for the selective hydrogenation of carbonyl groups. This catalyst showed excellent activity and selectivity in various solvents and could be recycled for at least 6 runs with little deactivation. In addition to LA, various substrates with both carbonyl and carboxyl groups could also be selectively hydrogenated to the corresponding lactones. This study offers both theor. foundation and practical instructions for the high-efficiency conversion of LA to GVL over nonnoble metal catalysts under mild conditions, especially ambient H2 pressure.

Green 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, Synthetic Route of 539-88-8.

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

Padilla, Rosa published the artcileEfficient catalytic hydrogenation of alkyl levulinates to γ-valerolactone, Synthetic Route of 539-88-8, the main research area is valerolactone preparation alkyl levulinate catalytic hydrogenation.

Efficient hydrogenations of neat alkyl levulinates to γ-valerolactone were achieved with low catalyst loadings of either PNP Ru or Ir complexes, resp., in the presence of a small amount of a base at low temperature and H2 pressure. Quant. conversions and TONs reaching 9300 were achieved. Furthermore, we demonstrate the feasibility of the system to perform several cycles. Finally, deuterium labeling and NMR studies provide insight into the reaction mechanism.

Green 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, Synthetic Route of 539-88-8.

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