Esters-buliding-blocks

Misal Castro, Luis C. published the artcileDirect Synthesis of Indoles from Azoarenes and Ketones with Bis(neopentylglycolato)diboron Using 4,4′-Bipyridyl as an Organocatalyst, SDS of cas: 539-88-8, the main research area is azoarene ketone bipyridyl catalyst Fischer indole cyclization; indole preparation.

Multifunctionalized indole derivatives were prepared by reducing azoarenes in the presence of ketones and bis(neopentylglycolato)diboron (B2nep2) with a catalytic amount of 4,4′-bipyridyl under neutral reaction conditions, where 4,4′-bipyridyl acted as an organocatalyst to activate the B-B bond of B2nep2 and form N,N’-diboryl-1,2-diarylhydrazines as a key intermediate. Further reaction of N,N’-diboryl-1,2-diarylhydrazines with ketones afforded N-vinyl-1,2-diarylhydrazines, which rearranged to the corresponding indoles via the Fischer indole mechanism. This organocatalytic system was applied to diverse alkyl cyclic ketones, dialkyl, and alkyl/aryl ketones, including heteroatoms. Me alkyl ketones gave the corresponding 2-methyl-3-substituted indoles in a regioselective manner. This protocol allowed us to expand the preparation of indoles having high compatibility with not only electron-donating and electron-withdrawing groups but also N- and O-protecting functional groups.

Journal of Organic Chemistry published new progress about Diazo compounds, aryl 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, SDS of cas: 539-88-8.

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

Li, Nan published the artcileCobalt-Catalyzed Deprotection of Allyl Carboxylic Esters Induced by Hydrogen Atom Transfer, Related Products of esters-buliding-blocks, the main research area is carboxylic acid preparation chemoselective; allyl carboxylic ester deprotection cobalt catalyst.

A brief, efficient method has been developed for the removal of the allyl protecting group from allyl carboxylic esters RC(O)OCH2CH=CH2 (R = cyclohexyl, Ph, thiophen-2-yl, 2H-1,3-benzodioxol-5-yl, etc.) using a Co(II)/TBHP/(Me2SiH)2O catalytic system. This facile strategy displays excellent chemoselectivity, functional group tolerance, and high yields. This transformation probably occurs through the hydrogen atom transfer process, and a Co(III)-six-membered cyclic intermediate is recommended.

Organic Letters published new progress about Carboxylic acids Role: SPN (Synthetic Preparation), PREP (Preparation). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Related Products of esters-buliding-blocks.

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

Vilanculo, Castelo Bandane published the artcileH4SiW12O40-Catalyzed Levulinic Acid Esterification at Room Temperature for Production of Fuel Bioadditives, Application of Ethyl 4-oxopentanoate, the main research area is levulinic acid esterification silicotungstic acid catalyst fuel bioadditive.

In this work, a route to synthesize bioadditives through H4SiW12O40-catalyzed levulinic acid esterification reactions with alcs. of short chain at room temperature was assessed. Among the Bronsted acids assessed (i.e., sulfuric, p-toluenesulfonic, silicotungstic, phosphomolybdic and phosphotungstic acids), H4SiW12O40 was the most active and selective catalyst. High conversions (ca. 90%) and selectivity (90-97%) for alkyl levulinates with carbon chain size ranging from C6 to C10 were obtained. The effect of main reaction parameters was studied, with a special focus on the reaction temperature, stoichiometry of reactants, concentration and nature of the catalyst. Insights on reaction mechanism were done and the activity of heteropoly catalysts was discussed based on acid strength and softness of the heteropolyanions. The use of renewable raw material, the mild reaction conditions (i.e., room temperature), and a recyclable solid catalyst are the some of the pos. features of this process. The alkyl levulinates obtained are renewable origin bioadditives that can be blended either to gasoline or diesel.

Waste and Biomass Valorization published new progress about Bronsted acids Role: CAT (Catalyst Use), PRP (Properties), USES (Uses). 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

Sun, Yingnan published the artcileIn Situ Approach to Dendritic Fibrous Nitrogen-Doped Carbon Nanospheres Functionalized by Bronsted Acidic Ionic Liquid and Their Excellent Esterification Catalytic Performance, Safety of Benzyl acetate, the main research area is bronsted acidic ionic liquid dendritic fibrous nanocarbon esterification.

Chem. bonding of Bronsted acidic ionic liquids (BAILs) on suitable supports is one of the promising strategies to develop efficient solid acids for catalytic conversion of biomass/derivatives to fuels and value-added chems. For this purpose, a series of dendritic fibrous nitrogen-doped carbon nanospheres functionalized by BAILs are demonstrated for the first time via an in situ silica nanocasting approach followed by chem. modification with 1,3-propanesultone and trifluoromethanesulonic acid successively. The resulting DFNC-[C3N][OTf] (C3 = PrSO3H, OTf = SO3CF3) serve as the solid acid catalysts for three biomass conversion-concerned esterification reactions, and by the combination of the advantages of superstrong Bronsted acidity, fascinating dendritic fibrous nanostructures, and interesting hierarchical micro-mesoporosity, the DFNC-[C3N][OTf] catalysts exhibit excellent esterification activity. More importantly, the cooperation of chem. bonding the -[C3][OTf-] sites on the dendritic fibrous nitrogen-doped carbon (DFNC) support and stabilizing the -[C3][OTf-] sites within the wrinkled fibers of the support result in the DFNC-[C3N][OTf] catalysts’ excellent reusability, and they can be reused at least five times without obvious changes in catalytic activity, nanostructures, porosity properties, and Bronsted acidity.

ACS Sustainable Chemistry & Engineering published new progress about Bronsted acids Role: CAT (Catalyst Use), PRP (Properties), USES (Uses). 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

Thenarukandiyil, Ranjeesh published the artcileHydroboration of Nitriles, Esters, and Carbonates Catalyzed by Simple Earth-Abundant Metal Triflate Salts, COA of Formula: C9H10O2, the main research area is hydroboration nitrile carbonate carboxylate preparation amine diol borate ester; manganese triflate catalyst hydroboration nitrile carbonate carboxylate; Carbonates and Esters; Earth-Abundant Metals; Hydroboration; Manganese; Nitriles.

Amine, glycol and alc. borate derivatives ArCH2N(Bpin)2, (pinB)OXO(Bpin) and ROBpin were prepared by manganese(II) triflate-catalyzed hydroboration of aromatic nitriles, cyclic carbonates and carboxylic esters with pinacolborane HBpin. During the past decade earth-abundant metals have become increasingly important in homogeneous catalysis. One of the reactions in which earth-abundant metals have found important applications is the hydroboration of unsaturated C-C and C-X bonds (X=O or N). Within these set of transformations, the hydroboration of challenging substrates such as nitriles, carbonates and esters still remain difficult and often relies on elaborate ligand designs and highly reactive catalysts (e. g., metal alkyls/hydrides). Here we report an effective methodol. for the hydroboration of challenging CN and C:O bonds that is simple and applicable to a wide set of substrates. The methodol. is based on using a manganese(II) triflate salt that, in combination with com. available potassium tert-butoxide and pinacolborane, catalyzes the hydroboration of nitriles, carbonates, and esters at room temperature and with near quant. yields in less than three hours. Addnl. studies demonstrated that other earth-abundant metal triflate salts can facilitate this reaction as well, which is further discussed in this report.

Chemistry – An Asian Journal published new progress about Borates Role: SPN (Synthetic Preparation), PREP (Preparation) (esters). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, COA of Formula: C9H10O2.

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

Jiang, Haiwei published the artcileHydrothermal liquefaction of Cd-enriched Amaranthus hypochondriacus L. in ethanol-water co-solvent: Focus on low-N bio-oil and heavy metal/metal-like distribution, Product Details of C7H12O3, the main research area is hydrothermal liquefaction cadmium amaranthus hypochondriacus; ethanol water nitrogen bio oil heavy metal.

The high nitrogen content in bio-oil from protein-rich biomass will cause the possible pollution problems by NOX emissions during combustion. In this study, Cd-enriched Amaranthus hypochondriacus L. (AHL) was treated by hydrothermal liquefaction (HTL) in ethanol-water co-solvent aiming to reduce the nitrogen content of the bio-oil. Besides, aqueous phase recycling (APR) was applied to achieve a higher bio-oil yield. HTL in ethanol-water co-solvent with APR three times resulted in the maximum bio-oil yield (47.26%) and greatly reduced the nitrogenous compounds content of bio-oil. During the APR process, the increase of total nitrogen (TN) content in the aqueous phase indicated that organic-N in the organic phase transformed into NH+4 to the aqueous phase. Acetic acid (13.87-22.37 mg/mL) was dominated in the aqueous phase, leading to a low pH value (6.27-5.29), which could serve as the possible catalyst for the HTL process during APR that can be the reason for the higher bio-oil yield. After the HTL process, Cr, Cu, Cd and Pb remained mostly in bio-char while As was present largely in the aqueous phase. Thus, this study demonstrated that the APR for HTL process in ethanol-water co-solvent can be a hopeful method to dispose the high-protein biomass for improved bio-oil yield and quality.

Fuel published new progress about Alcohols 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, Product Details of C7H12O3.

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

Jiang, Haiwei published the artcileHydrothermal liquefaction of Cd-enriched Amaranthus hypochondriacus L. in ethanol-water co-solvent: Focus on low-N bio-oil and heavy metal/metal-like distribution, HPLC of Formula: 623-50-7, the main research area is hydrothermal liquefaction cadmium amaranthus hypochondriacus; ethanol water nitrogen bio oil heavy metal.

The high nitrogen content in bio-oil from protein-rich biomass will cause the possible pollution problems by NOX emissions during combustion. In this study, Cd-enriched Amaranthus hypochondriacus L. (AHL) was treated by hydrothermal liquefaction (HTL) in ethanol-water co-solvent aiming to reduce the nitrogen content of the bio-oil. Besides, aqueous phase recycling (APR) was applied to achieve a higher bio-oil yield. HTL in ethanol-water co-solvent with APR three times resulted in the maximum bio-oil yield (47.26%) and greatly reduced the nitrogenous compounds content of bio-oil. During the APR process, the increase of total nitrogen (TN) content in the aqueous phase indicated that organic-N in the organic phase transformed into NH+4 to the aqueous phase. Acetic acid (13.87-22.37 mg/mL) was dominated in the aqueous phase, leading to a low pH value (6.27-5.29), which could serve as the possible catalyst for the HTL process during APR that can be the reason for the higher bio-oil yield. After the HTL process, Cr, Cu, Cd and Pb remained mostly in bio-char while As was present largely in the aqueous phase. Thus, this study demonstrated that the APR for HTL process in ethanol-water co-solvent can be a hopeful method to dispose the high-protein biomass for improved bio-oil yield and quality.

Fuel published new progress about Alcohols Role: TEM (Technical or Engineered Material Use), USES (Uses). 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, HPLC of Formula: 623-50-7.

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

Diaz, Irina published the artcileCombined effects of sulfur dioxide, glutathione and light exposure on the conservation of bottled Sauvignon blanc, Quality Control of 110-42-9, the main research area is Wine Oxidation Light exposure Antioxidants Storage; Antioxidants; Light exposure; Oxidation; Storage; Wine.

Oxygen exposure may trigger a series of changes that could be detrimental to the quality white wines. This study evaluated the combined effects of sulfur dioxide, glutathione and light exposure on the chem. and sensory perception of bottled Sauvignon blanc. The wines were manually bottled into clear bottles, closed with low oxygen transfer rate stoppers, and stored for three months, either exposed or protected from light. The wines exposed to artificial light showed higher rates of sulfite loss and oxygen consumption, were significantly darker in color, exhibited significant changes in the concentration of phenolics and volatile compounds, were perceived as less fruity/floral, and had higher nuances of solvent, earthy and honey aromas than the ones protected from light. The treatments with higher amounts of initial sulfites and glutathione were able to delay some of these changes but were less significant than protecting the wines from artificial light.

Food Chemistry published new progress about Polyphenols (nonpolymeric) Role: ANT (Analyte), ANST (Analytical Study). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Quality Control of 110-42-9.

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

Kurisingal, Jintu Francis published the artcileWater-Tolerant DUT-Series Metal-Organic Frameworks: A Theoretical-Experimental Study for the Chemical Fixation of CO2 and Catalytic Transfer Hydrogenation of Ethyl Levulinate to γ-Valerolactone, HPLC of Formula: 539-88-8, the main research area is zirconium hafnium naphthalenedicarboxylate Dresden University MOF preparation catalyst; water tolerant DUT MOF preparation fixation carbon dioxide catalysis; transfer hydrogenation MOF catalyzed ethyl levulinate gamma valerolactone preparation; cycloaddition carbon dioxide epoxide zirconium hafnium naphthalenedicarboxylate MOF catalyzed; CO2; DUT; biomass; cyclic carbonate; γ-valerolactone.

A series of highly thermally and hydrolytically stable porous solids with intriguing properties of zirconium- and hafnium-based metal-organic frameworks (MOFs) [Dresden University of Technol. (DUT) series] was synthesized. The DUT MOFs were effective catalysts for both epoxide-CO2 cycloaddition reactions and the catalytic transfer hydrogenation (CTH) of Et levulinate (EL). In particular, 12-connected DUT-52(Zr) showed higher catalytic activity than eight- and six-connected catalysts in the synthesis of cyclic carbonates as well as in the production of γ-valerolactone (GVL). The secondary building unit connectivity, coexistence of a moderate number of acidic and basic sites, Brunauer-Emmett-Teller surface area, and combined effects of the pores of the MOFs seem to influence the catalytic activity. The reaction mechanism for the DUT-52(Zr)-mediated cycloaddition reaction of CO2 and the CTH reactions were investigated in detail by using periodic d. functional theory calculations To the best of authors knowledge, this is the first detailed computational study for the formation of GVL from EL by using MOF as the catalyst. In addition, grand canonical Monte Carlo simulations predicted the strong interaction of CO2 mols. with the DUT-52(Zr) framework. Remarkably, the DUT-series catalysts possess extraordinary tolerance toward water. Further, DUT-52(Zr) is recyclable and is an efficient catalyst for cycloaddition and CTH reactions for at least five uses without obvious reductions in the activity or structural integrity.

ACS Applied Materials & Interfaces published new progress about Cyclic carbonates 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

Das, Uttam Kumar published the artcileDehydrogenative Cross-Coupling of Primary Alcohols To Form Cross-Esters Catalyzed by a Manganese Pincer Complex, SDS of cas: 111-11-5, the main research area is primary alc manganese pincer complex catalyst dehydrogenative cross coupling; cross ester preparation.

Base-metal-catalyzed dehydrogenative cross-coupling of primary alcs. to form cross-esters as major products, liberating hydrogen gas, is reported. The reaction is catalyzed by a pincer complex of earth-abundant manganese in the presence of catalytic base, without any hydrogen acceptor or oxidant. Mechanistic insight indicates that a dearomatized complex is the actual catalyst, and indeed this independently prepared dearomatized complex catalyzes the reaction under neutral conditions.

ACS Catalysis published new progress about Carboxylic esters Role: SPN (Synthetic Preparation), PREP (Preparation). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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