Esters-buliding-blocks

Kar, Sayan published the artcileDehydrogenative ester synthesis from enol ethers and water with a ruthenium complex catalyzing two reactions in synergy, Related Products of esters-buliding-blocks, the main research area is ruthenium complex catalyst preparation ester synthesis; ester chemoselective dehydrogenative preparation mechanism; vinyl enol ether oxidation ruthenium complex catalyst mechanism; cyclic enol ether oxidation ruthenium complex catalyst mechanism.

The authors report the dehydrogenative synthesis of esters RO2CMe [R = Et, n-Bu, Bn, etc.] from enol ethers using water as the formal oxidant, catalyzed by a newly developed ruthenium acridine-based PNP(Ph)-type complex. Mechanistic experiments and d. functional theory (DFT) studies suggest that an inner-sphere stepwise coupled reaction pathway was operational instead of a more intuitive outer-sphere tandem hydration-dehydrogenation pathway.

Green Chemistry published new progress about Carboxylic esters Role: SPN (Synthetic Preparation), PREP (Preparation). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Related Products of esters-buliding-blocks.

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

Nagre, R. D. published the artcileSynthesis and assessment of a hydrophobically associating heteropolymer in water-based mud, HPLC of Formula: 142-90-5, the main research area is acrylamide HEMA lauryl methacrylate AMPS copolymer drilling fluid.

Water-soluble polymers can be used as key ingredients of both drilling fluids for virgin fields and polymer-enhanced oil recovery in underperforming reservoirs. The efficacy of hydrophobically associating heteropolymer (HAH-polymer) as an agent for petroleum resource recovery was examined in this study. The hydrophobically associating heteropolymer (HAH-polymer) comprising acrylamide, sodium 2-acrylamido-2-methylpropanesulfonate, hydroxyethyl methacrylate and lauryl methacrylate was synthesized in micellar medium by free-radical polymerization The hydrophobically associating heteropolymer (HAH-polymer) was characterized by FTIR and 1H NMR spectral analyses. The effects of temperature, pH and shear on the solution behavior of the HAH-polymer were also examined Rheol. and fluid loss properties of HAH-polymer-incorporated water-based drilling fluids were assessed. The HAH-polymer improved the thermal stability between 25 and 160° of the drilling mud and maintained mud fluid loss of 8.4-8.6 cm3 compared with the polymer-free blank of 43.5-107.0 cm3. In a salt-contaminated mud, the heteropolymer enhanced rheol. properties and significantly reduced API filtration loss to 7.6-8.8 cm3 after hot aging between 25 and 150°. Under high temperature-high pressure filtration testing of muds, the HAH-polymer demonstrated excellent fluid loss reduction by providing about eightfold fluid loss control (14.7 cm3) compared to the polymer-free blank (113.2 cm3) at 150°.

Chemical Papers published new progress about Bentonite Role: TEM (Technical or Engineered Material Use), USES (Uses). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, HPLC of Formula: 142-90-5.

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

Onkarappa, Sharath Bandibairanahalli published the artcileEfficient and Scalable Production of Alkyl Levulinates from Cellulose-Derived Levulinic Acid Using Heteropolyacid Catalysts, Related Products of esters-buliding-blocks, the main research area is levulinic acid heteropolyacid catalyst esterification alkyl levulinate preparation.

This work reports a straightforward and scalable synthesis of a series of alkyl levulinates from cellulose-derived levulinic acid and alkyl alcs. using com. available heteropolyacid catalysts under homegenous conditions. The reaction was optimized on parameters such as temperature, molar ratio of reagents, type and loading of catalyst. The solvent-free reactions afforded alkyl levulinates in high isolated yields (>85%) using only slight excess of alcs. and 10 wt% of catalyst at 120 °C in 6 h. Further, the catalysts were successfully recycled for three consecutive cycles without significant loss in activity.

ChemistrySelect published new progress about Aliphatic esters Role: IMF (Industrial Manufacture), PREP (Preparation). 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

Connatser, Raynella M. published the artcileApproaches to investigate the role of chelation in the corrosivity of biomass-derived oils, Synthetic Route of 539-88-8, the main research area is chelation investigate role corrosivity biomass derived oil.

The need to provide the U. S. market with a renewable liquid fuel energy source from a non-food feedstock stream has gained considerable traction due to benefits such as improved energy efficiency, reduced environmental impacts, and enhanced national security. Practical achievement of these goals via biomass and bio-waste utilization involves production of liquid intermediates containing corrosive, reactive species like carboxylic acids, ketones, aldehydes, and hydroxyaldehydes. Such mixtures challenge materials of containment, processing, and transport. It is widely recognized that the smaller organic acids, such as acetic and formic, are corrosive and can remove protective surface oxides on alloys used in bio-oil processing infrastructure, and ketones can swell sealing polymers. However, literature shows, and findings herein confirm, larger carboxylic acids and bidentate alcs. are present. This highlights the potential for synergistic, detrimental effects of constituents in bio-oil corrosion, including direct reactivity of small acids compounded with the possibility of mobilization of protective metal oxide layers via chelation by larger acids and oxygenates. The question of whether species beyond small acids can significantly contribute to corrosion requires anal. approaches previously not applied to bio-oil corrosion studies and certainly not previously applied corroboratively. This work introduces a combination of optical, mass spectral, and electrochem. impedance spectroscopies with an incubation approach to study metal mobilization, to facilitate elucidating chelation’s role in bio-oil corrosive pathways. To enable systematic study of these oxygenates’ material compatibility individually and in combination, a model matrix of bio-oil constituents was also developed based on identification of key components of real bio-oils.

Biomass and Bioenergy published new progress about Aldehydes Role: TEM (Technical or Engineered Material Use), USES (Uses). 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

Nan, He published the artcileExamining the unique retention behavior of volatile carboxylic acids in gas chromatography using zwitterionic liquid stationary phases, Application of Methyl decanoate, the main research area is volatile carboxylic acid gas chromatog zwitterionic liquid stationary phase; Gas chromatography; Solvation parameter model; Stationary phase; Volatile carboxylic acids; Zwitterionic liquid.

For the first time, gas chromatog. (GC) stationary phases consisting of zwitterionic liquids (ZILs) possessing sulfonate functional groups were utilized for the anal. of volatile carboxylic acids (VCAs). The highly polar and acidic nature of VCAs significantly limits the number of currently available GC stationary phases, which are all largely based on acid-modified polyethylene glycol. In this study, it is shown that this class of ZILs exhibit strong retention of VCAs with excellent peak symmetry. Unique chromatog. selectivity toward VCAs is also demonstrated by tuning the structural features of the ZILs. The solvation properties of the three ZILs as well as a structurally similar conventional monocationic IL were characterized using the Abraham solvation parameter model.

Journal of Chromatography A published new progress about Carboxylic acids Role: ANT (Analyte), ANST (Analytical Study) (volatile). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Application of Methyl decanoate.

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

Tang, Bo published the artcileHierarchical FAU-Type Hafnosilicate Zeolite as a Robust Lewis Acid Catalyst for Catalytic Transfer Hydrogenation, Related Products of esters-buliding-blocks, the main research area is hafnosilicate zeolite catalyst transfer hydrogenation.

FAU-type hafnosilicate zeolite with a hierarchical structure (Hf-USY) was constructed through a post-synthesis strategy containing the controlled dealumination of the com. H-USY zeolite and the subsequent dry impregnation of the Cp2HfCl2 precursor. The incorporation of Hf ions into the zeolite framework involved the interaction between the silanol groups from framework dealumination and Cp2HfCl2 mols. Characterization results from UV-vis and XPS verified that the incorporated Hf ions mainly existed in the tetrahedrally coordinated form in the zeolite framework. The creation of Lewis acid sites associated with Hf incorporation was confirmed by Fourier transform IR spectroscopy with pyridine and deuterated acetonitrile adsorption. The as-synthesized Hf-USY zeolite served as a highly efficient catalyst in the transfer hydrogenation of Et levulinate to γ-valerolactone, outperforming the Sn- and Zr-silicate analogs. The Hf-USY catalyst also exhibited good performance in the transfer hydrogenation of more challenging substrates such as furanic, aromatic, as well as alkene-substituted carbonyl compounds into the corresponding alcs. The influence of Lewis acid sites, preparation parameters, as well as the hydrogen donor on the catalytic activity of the Hf-USY zeolite was investigated in detail. FAU-type hafnosilicate zeolite with a hierarchical structure is developed as a robust catalyst for the transfer hydrogenation of Et levulinate to γ-valerolactone.

ACS Sustainable Chemistry & Engineering published new progress about Beta zeolites Role: CAT (Catalyst Use), USES (Uses) (dealluminated, Hf-). 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

Guo, Xuan published the artcileThe Photocatalyst-Free Cross-Dehydrogenative Coupling Reaction Enabled by Visible-Light Direct Excitation of Substrate, HPLC of Formula: 539-88-8, the main research area is aryl tetrahydroisoquinoline ketone photochem dehydrogenation cross coupling reaction; dihydroisoquinolinyl ketone preparation green chem; phosphite aryltetrahydroisoquinolinyl photochem dehydrogenation cross coupling reaction; phosphonyldihydroisoquinoline aryl preparation green chem.

A new photocatalyst-free strategy for the cross-dehydrogenative C-C and C-P coupling reaction was described. This protocol provided a concise method to synthesize various 1-substituted tetrahydroisoquinoline (THIQ) derivatives enabled by visible-light direct excitation of substrates without using any photocatalyst. Moreover, a wide substrate scope demonstrated good synthetic versatility and practicality.

Journal of Organic Chemistry published new progress about Aromatic compounds 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, HPLC of Formula: 539-88-8.

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

Li, Lixia published the artcileSelective aerobic oxidative cleavage of lignin C-C bonds over novel hierarchical Ce-Cu/MFI nanosheets, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is zeolite MFI supported cerium copper catalyst preparation property; oxidative bond cleavage depolymerization lignin aromatic compound.

The catalytic depolymerization process for lignin to produce value added chems. is often challenged by the limited mass transfer over heterogeneous catalysts, the complex aromatic biopolymer structures, and the high recalcitrance of C-C bonds. Herein, a series of hierarchical MFI nanosheets (MFI-ns) supported metal oxide catalysts have been designed and used for the selectively oxidative cleavage of organosolv lignin. As expected, 81.6% conversion of lignin can be achieved over 15Ce-5Cu/MFI-ns with 294.0 mg g-1 yield of volatile products, including 180.9 mg g-1 of di-Et maleate. Quantum chem. calculation coupled with static adsorption measurements shows that the superior catalytic activities of these catalysts are ascribed to the favorable mass transport of lignin to the active sites by the unique layer structure, and the hierarchical pore sizes distribution, as well as the electronic effect between Cu and Ce components. In addition, the catalytic mechanism for the cleavage of C-C bonds in β-O-4 model probes has been studied via the controlled oxidative degree of model compounds and the isotope-labeling experiments Therefore, this work provides a new insight into the efficient utilization of lignin via the rational design of catalysts.

Applied Catalysis, B: Environmental published new progress about Aromatic compounds 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

Chen, Yaoyao published the artcileBu4NI-Catalyzed C-C Bond Cleavage and Oxidative Esterification of Allyl Alcohols with Toluene Derivatives, Formula: C9H10O2, the main research area is arylpropenol toluene oxidative esterification tetrabutylammonium iodide catalyst; ester preparation.

A novel oxidative esterification of 1-arylprop-2-en-1-ols R1CH(OH)CH=CHR2 (R1 = Ph, 2-chlorophenyl, 4-bromophenyl, etc.; R2 = H, Me, 3-methoxyphenyl) with toluene derivatives ArMe (Ar = Ph, 3-chlorphenyl, 2-naphthyl, etc.) catalyzed by tetrabutylammonium iodide (TBAI) is reported. The optimization of the reaction conditions illustrates that each of experiment parameters including the catalyst, solvent, and oxidant is significant for present oxidative functionalization. This metal-free protocol has a broad substrate scope including the halogen groups for further functionalization and enriches the reactivity profile of allyl alc. and toluene derivatives In addition, this protocol represents a new transformation of allyl alc. involving C-C bond cleavage and C-O bond forming.

Synthesis published new progress about Allylic alcohols Role: RCT (Reactant), RACT (Reactant or Reagent) (aryl). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Formula: C9H10O2.

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

Behera, Rakesh R. published the artcileHydrosilylation of Esters Catalyzed by Bisphosphine Manganese(I) Complex: Selective Transformation of Esters to Alcohols, Safety of Benzyl acetate, the main research area is alc diol preparation; Xantphos manganese complex preparation chemoselective hydrosilylation catalyst crystal structure; manganese catalyst chemoselective hydrosilylation ester.

A tricarbonylruthenium Xantphos complex I was prepared and characterized by X-ray crystallog.; in the presence of I, esters underwent chemoselective hydrosilylation with phenylsilane under neat conditions (followed by workup with base) to yield esters. Aryl, alkyl, and alkenyl mono- and dicarboxylates and lactones underwent chemoselective reduction to alcs. and diols; ketoesters underwent reduction to diols. Poly(1,6-hexanediol adipate) underwent hydrosilylation to 1,6-hexanediol.

Organic Letters published new progress about Aliphatic alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Safety of Benzyl acetate.

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