Tag: M.W=100-150

Tetrisyanda, Rizky published the artcileLiquid-liquid equilibria of ternary aqueous mixtures containing alcohols and alkyl levulinates, Computed Properties of 539-88-8, the main research area is alc alkyl levulinate LLE ternary aqueous mixture.

The liquid-liquid equilibrium (LLE) data were measured for the ternary systems of water + methanol + Et levulinate, water + ethanol + Et levulinate, and water + n-butanol + Bu levulinate in a temperature range of 298.15 K to 328.15 K and at 101.3 kPa. Among the investigated mixtures, the Et levulinate-containing systems are categorized as a type-I LLE and their areas of two-liquid-phase region decreases with increasing temperature The ternary system of water + n-butanol + Bu levulinate behaves as a type-II LLE and interestingly its area of two-liquid-phase region increases with an increase of temperature over the exptl. condition. These new LLE tie-lines data were correlated accurately with the NRTL model.

Journal of Chemical Thermodynamics published new progress about Alcohols Role: NUU (Other Use, Unclassified), USES (Uses). 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

He, Aiyong published the artcileHigh-Efficiency Catalytic Transfer Hydrogenation of Biomass-Based 5-Hydroxymethylfurfural to 2,5-Bis(hydroxymethyl)furan over a Zirconium-Carbon Coordination Catalyst, Computed Properties of 539-88-8, the main research area is catalytic transfer hydrogenation hydroxymethylfurfural hydroxymethylfuran zirconium carbon.

Constructing a cheap and high-performance catalyst is very important for the selective synthesis of biomass-based 2,5-bis(hydroxymethyl)furan (BHMF) from 5-hydroxymethylfurfural via the strategy of catalytic transfer hydrogenation (CTH). Herein, we synthesized a neoteric zirconium-carbon coordination catalyst (Zr-HTC) via a simple self-assembly method, in which glucose-derived hydrothermal carbon (HTC) containing abundant carboxyl and phenolic hydroxyl groups was directly used as a low-cost organic ligand. Satisfyingly, Zr-HTC showed an outstanding catalytic activity for the selective synthesis of BHMF in isopropanol (iPrOH). After 4 h at a mild temperature of 120°C, 99.2% BHMF yield with 5.61 h-1 turnover frequency (TOF) could be obtained. Detailed exptl. results demonstrated that this outstanding catalytic activity of Zr-HTC was mainly contributed by the synergetic effects of Lewis acid-base sites (Zr4+-O2-) with high contents, proper ratios, and strengths under the aid of good hydrophilicity. In addition, Zr-HTC displayed superior catalytic stability, and when it was repeatedly used for five reaction cycles, no noticeable decrease in BHMF yield was found. More significantly, Zr-HTC could also effectively convert a wide range of carbonyl compounds, such as 1-butanal, 1-hexanal, furfural, cyclohexanal, benzaldehyde, phenylacetaldehyde, cyclopentanone, cyclohexanone, levulinic acid, and Et levulinate, to the relevant products in iPrOH. Overall, this work offers a new viewpoint to develop more practical zirconium-containing coordination catalysts for the selective synthesis of valuable chems. via CTH.

ACS Sustainable Chemistry & Engineering published new progress about Alcohols Role: NUU (Other Use, Unclassified), USES (Uses). 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

Pinheiro, Patricia Fontes published the artcileOne-pot synthesis of alkyl levulinates from biomass derivative carbohydrates in tin(II) exchanged silicotungstates-catalyzed reactions, Quality Control of 539-88-8, the main research area is tin exchanged Keggin heteropolyacid catalysis carbohydrate alcoholysis alkyl levulinate.

Biomass is an attractive source of carbohydrates that can be converted to fuels and fine chems. Acid-catalyzed alcoholysis of biomass derivatives provides alkyl levulinates, which are fuel bioadditives, intermediates in the synthesis of drugs and agrochems. In this work, we developed a one-pot route to obtain alkyl levulinates using Sn(II) exchanged Keggin heteropolyacids (i.e., H3PW12O40, H3PMo12O40, and H4SiW12O40) as catalysts, in alcoholysis reactions of various carbohydrates. All the catalysts were characterized by FT-IR, XRD, EDS/SEM, TG/DSC, and BET anal. The tin(II) silicotungstate was the most active and selective catalyst. After 2 h of reaction carried out at 423 K, an almost complete conversion was achieved on the ethanolysis of the fructose, sucrose and inulin, which gave high yields of Et levulinate (ca. 78, 71 and 61 mol%, resp.). In all reactions, 5-ethoxymethylfurfural was always the secondary product. Maltose, galactose, and glucose were almost unreactive. The effects of main parameters of reaction, such as temperature, catalyst load, and type of alcs. were assessed. The Sn2SiW12O40 catalyst was easily recovered and successfully reused for 7 cycles, without loss activity.

Cellulose (Dordrecht, Netherlands) published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Annatelli, Mattia published the artcileAlkyl Levulinates from Furfuryl Alcohol Using CT151 Purolite as Heterogenous Catalyst: Optimization, Purification, and Recycling, Application of Ethyl 4-oxopentanoate, the main research area is alkyl levulinate preparation; furylmethanol alkyl alc purolite catalyst alcoholysis.

Com. available Purolite CT151 demonstrated to be an efficient acid catalyst for the synthesis of alkyl levulinates via alcoholysis of furfuryl alc. (FA) at mild temperatures (80-120°C) and short reaction time (5 h). Reaction conditions were first optimized for the synthesis of Et levulinate and then tested for the preparation of methyl-, propyl-, isopropyl-, Bu, sec-butyl- and allyl levulinate. Preliminary scale-up tests were carried out for most of the alkyl levulinates (starting from 5.0 g of FA) and the resulting products were isolated as pure by distillation in good yields (up to 63%). Furthermore, recycling experiments, conducted for the preparation of Et levulinate, showed that both the Purolite CT151 and the exceeding ethanol was recovered and reused for four consecutive runs without any noticeable loss in the catalyst activity.

Sustainable Chemistry published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application of Ethyl 4-oxopentanoate.

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

Pelosi, Azzurra published the artcileReductive Etherification of Aldehydes and Ketones with Alcohols and Triethylsilane Catalysed by Yb(OTf)3: an Efficient One-Pot Benzylation of Alcohols, HPLC of Formula: 5405-41-4, the main research area is ether preparation; aldehyde ketone alc reductive etherification triethylsilane ytterbium triflate catalyst.

The one-pot synthesis of sym. and unsym. ethers from aldehydes and ketones can be conveniently performed using Yb(OTf)3 as catalyst and triethylsilane as reducing agent in presence of alcs. This methodol. leads to the synthesis of ether derivatives with good yields. Notably, this process resulted a useful tool to protect alcs. as benzyl ether derivatives using differently substituted benzaldehydes as protecting agents under mild conditions. A plausible mechanism was also proposed.

Advanced Synthesis & Catalysis published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, HPLC of Formula: 5405-41-4.

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

Bernardo, Joana R. published the artcileHReO4 as highly efficient and selective catalyst for the conversion of carbohydrates into value added chemicals, Computed Properties of 539-88-8, the main research area is HReO4 catalyst carbohydrate conversion.

This work describes the first catalyst (HReO4) that promotes the efficient and selective conversion of several carbohydrates into four compounds, Et levulinate (EL), 5-ethoxymethylfurfural (EMF), 5-hydroxymethylfurfural (HMF) and levulinic acid (LA), through a one-pot reaction strategy adjusting the reaction conditions. The reaction of fructose in ethanol at 160 °C gave EL in 80% yield after 16 h and in a mixture of ethanol/THF at 140 °C produced EMF in 73% yield after 1 h. HMF and LA can also be obtained selectively with 100% yield from fructose at 140 °C after 1 h, in DMSO or 1,4-dioxane, resp. EL, HMF, LA and EMF were also produced in moderate to good yields from other carbohydrates such as inulin and sucrose. The catalyst HReO4 can be used in gram scale for the production of EL, EMF, HMF and LA with good yields and in at least 8 catalytic cycles on the conversion of fructose into EL with no significant reduction in its activity.

Molecular Catalysis published new progress about Carbohydrates Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Casas, Fernando published the artcileA Diaminopropane Diolefin Ru(0) Complex Catalyzes Hydrogenation and Dehydrogenation Reactions, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is diolefin diaminopropane ruthenium dehydrogenated iminopropenamide complex catalyst preparation; carboxylic acid preparation; primary alc oxidation diolefin diaminopropane ruthenium complex catalyst; amide preparation; amine primary alc dehydrogenative coupling diolefin diaminopropane ruthenium catalyst; alc amine preparation; ester ketone aldehyde imine olefin hydrogenation DAP ruthenium catalyst.

New ruthenium (0) complexes with a cooperative diolefin diaminopropane (DAP) or dehydrogenated iminopropenamide ligand (IPA) were synthesized for comparison with their diaminoethane (DAE)/diazadiene (DAD) ruthenium analogs. These DAP/IPA complexes were efficient catalysts in dehydrogenation reactions of alk. aqueous methanol which proceeded under mild conditions (T=70 °C) and of higher alcs., forming corresponding carbonate and carboxylates, resp. The scope of reaction included an example of a 1,2-diol as model for biomass derived alcs. Their catalytic applications were extended to atom-efficient dehydrogenative coupling of alcs. and amines to amides. The reaction proceeded without any additives and was applicable to synthesis of formamides from methanol. Moreover, DAP/IPA complexes catalyzed hydrogenation of a series of esters, lactone, ketone, activated olefin, aldehyde and imine substrates. The diaminopropane Ru catalyst I exhibited higher activity compared to dehydrogenated β-ketiminate (IPA) and previously studied DAD/DAE based catalysts. The studies on their stoichiometric reactivity with relevance to their possible catalytic mechanisms and isolation and full characterization of key reaction intermediates were also presented.

ChemCatChem published new progress about Amides Role: SPN (Synthetic Preparation), 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

Sun, Kai published the artcileImportance of the synergistic effects between cobalt sulfate and tetrahydrofuran for selective production of 5-hydroxymethylfurfural from carbohydrates, Name: Ethyl 4-oxopentanoate, the main research area is cobalt sulfate THF carbohydrate hydroxymethylfurfural.

In this study, an effective catalytic system (CoSO4·7H2O/THF) for selective conversion of fructose to 5-hydroxymethylfurfural (HMF; yield: 88%) was developed. The synergistic effects among Co2+, SO42-, crystal water and THF (THF) were crucial for achieving selective dehydration of fructose to HMF. Co2+ worked as a Lewis acid for catalyzing mainly dehydration of fructose to HMF but not the further decomposition of HMF to levulinic acid. THF could help to retain HMF while CoSO4 could coordinate with HMF, enhancing the thermal stability of HMF in THF. The crystal water in cobalt sulfate could help to coordinate with fructose, which facilitated the conversion of fructose via dehydration reactions. The CoSO4·7H2O/THF catalytic system could also catalyze the conversion of inulin and cellulose into HMF. The main advantages of the CoSO4·7H2O/THF catalytic system are the low cost, the easy recycling of the CoSO4·7H2O catalyst and the easy separation of HMF from volatile THF.

Catalysis Science & Technology published new progress about Esters Role: SPN (Synthetic Preparation), PREP (Preparation). 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

Figliolia, Rosario published the artcileCNN pincer ruthenium complexes for efficient transfer hydrogenation of biomass-derived carbonyl compounds, Synthetic Route of 539-88-8, the main research area is ruthenium pincer CNN aryl pyridinemethanamine phosphine carbonyl complex preparation; transfer hydrogenation catalyst ketone aldehyde pincer CNN pyridinemethanamine complex; alc preparation transfer hydrogenation cellulose lignin derived aldehyde ketone.

The ligand HCNNOMe [6-(4-methoxyphenyl)-2-pyridinemethanamine, H2NCH2pyC6H4OMe, py = 2,6-pyridinediyl] is easily prepared by Pd/C-catalyzed reductive amination of the com. available 6-(4-methoxyphenyl)-2-pyridinecarboxaldehyde (H2, 1 atm). The pincer complexes cis-[RuCl(H2NCH2pyC6H3OMe)(PPh3)2] (1) and [RuCl(H2NCH2pyC6H3OMe)(PP)] (2, PP = dppb; 3, PP = dppf) are synthesized from [RuCl2(PPh3)3], H2NCH2pyC6H4OMe and dppb or dppf in 2-propanol with NEt3 at reflux and are isolated in 85-93% yield. Carbonylation of 1 (CO, 1 atm) gives [RuCl(H2NCH2pyC6H3OMe)(CO)(PPh3)] (4) (79% yield) which cleanly reacts with Na[BArf4] and PCy3, affording the cationic trans-[Ru(H2NCH2pyC6H3OMe)(CO)(PCy3)(PPh3)][BArF4] (5) (92% yield). These robust pincer complexes display remarkably high catalytic activity in the transfer hydrogenation (TH) of lignocellulosic biomass carbonyl compounds, using 2-propanol at reflux in a basic medium (NaOiPr or K2CO3). Thus, furfural, 5-(hydroxymethyl)furfural and cyrene are reduced to the corresponding alcs. with 2 and 3, at S/C in the range of 10 000-100 000, within minutes or hours (TOF up to 1 500 000 h-1). The monocarbonyl complex 5 was found to be extremely active in the TH of cinnamaldehyde, vanillin derivatives and Et levulinate at S/C in the range of 10 000-50 000. Vanillyl alc. is also obtained by the TH of vanillin with 5 (S/C = 500) in 2-propanol in the presence of K2CO3.

Dalton Transactions published new progress about Alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 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

Yao, Zi-Jian published the artcileCatalytic hydrogenation of carbonyl and nitro compounds using an [N,O]-chelate half-sandwich ruthenium catalyst, Application In Synthesis of 5405-41-4, the main research area is ruthenium sandwich catalyst preparation crystal structure; nitro compound ruthenium sandwich catalyst hydrogenation; carbonyl compound ruthenium sandwich catalyst hydrogenation.

A series of N,O-chelate half-sandwich ruthenium complexes for both carbonyl and nitro compound hydrogenation have been synthesized based on β-ketoamino ligands. All complexes exhibited high activity for the catalytic hydrogenation of a series of ketones and nitroarenes with mol. H2 as the reducing reagent in aqueous medium. Consequently, the catalytic system showed the catalytic TON values of 950 for 1-phenylethanol in acetophenone hydrogenation and 1960 for 1-chloro-4-nitrobenzene in p-chloroaniline hydrogenation. Good catalytic activity was displayed for various kinds of substrates with either electron-donating or electron-withdrawing groups. The neutral ruthenium complexes 1-4 were fully characterized using NMR, IR, and elemental anal. Mol. structures of complexes 2 and 4 were further confirmed using single-crystal X-ray diffraction anal.

Dalton Transactions published new progress about Alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Application In Synthesis of 5405-41-4.

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