Tag: M.W:100-200

Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 492-62-6, Name is alpha-D-Glucose, SMILES is O[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O, in an article , author is McLoughlin, Elizabeth A., once mentioned of 492-62-6, Category: tetrahydrofurans.

Electrochemically Regenerable Hydrogen Atom Acceptors: Mediators in Electrocatalytic Alcohol Oxidation Reactions

A class of electrochemical mediators is described for electrocatalytic oxidation reactions that are catalyzed by metal hydrides. The octahedral ruthenium complex [Ru(acac)(2)(pyimN)] ((RuN)-N-III 3) is shown to abstract a hydrogen atom from the ruthenium hydride [RuH(CNN)(dppb)] (RuH 2, CNN = 2-aminomethyl-6-tolylpyridine, dppb = 1,4-bis(diphenylphosphino)-butane) to generate [Ru(acac)2(pyimNH)] ((RuNH4)-N-II) and a reduced Ru(CNN)(dppb) complex. As (RuN3)-N-III can be electrochemically regenerated from (RuNH4)-N-II under appropriately basic and oxidizing conditions, we envisioned using (RuN)-N-III 3 as a suitable electrochemically regenerable hydrogen atom acceptor in a tandem electrocatalytic cycle to reduce the overpotential for electrocatalytic alcohol oxidation by 450 mV. In the presence of a strong base, the previously reported alcohol oxidation electrocatalyst [RuX(CNN)(dppb)] (1, X = Cl, 2, X = H) catalyzes the oxidation of isopropanol to acetone with a turnover frequency (TOF) greater than 3 s(-1) at -0.70 V versus ferrocenium/ferrocene (Fc(+/0)) in tetrahydrofuran. Upon adding (RuNH)-N-II 4, RuCl 1 electrocatalytically oxidizes isopropanol to acetone at -1.20 V versus Fc(+/0) in tetrahydrofuran with a TOF of ca. 1 s(-1). Cyclic voltammetry and chemical hydrogen atom transfer studies suggest that the predominant electrocatalytic pathway involves hydrogen atom abstraction from RuH 2 by electrochemically generated (RuN)-N-III 3.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 104-67-6, Name is Undecanoic gamma-Lactone, SMILES is O=C1OC(CCCCCCC)CC1, in an article , author is Cai, Xinpei, once mentioned of 104-67-6, Formula: C11H20O2.

Catalytic Hydroxycyclopropanol Ring-Opening Carbonylative Lactonization to Fused Bicyclic Lactones

A novel palladium-catalyzed ring opening carbonylative lactonization of readily available hydroxycyclopropanols was developed to efficiently synthesize tetrahydrofuran (THF) or tetrahydropyran (THP)-fused bicyclic gamma-lactones, two privileged scaffolds often found in natural products. The reaction features mild reaction conditions, good functional group tolerability, and scalability. Its application was demonstrated in a short total synthesis of (+/-)-paeonilide. The fused bicyclic gamma-lactone products can be easily diversified to other medicinally important scaffolds, which further broadens the application of this new carbonylation method.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 706-14-9, Name is gamma-Decanolactone, SMILES is O=C1OC(CCCCCC)CC1, in an article , author is Wu, Yining, once mentioned of 706-14-9, SDS of cas: 706-14-9.

Probing effects of thermal and chemical coupling method on decomposition of methane hydrate by molecular dynamics simulation

Methane hydrate, being a potential alternative energy source has attracted the attention of many researchers. Here, we investigated the decomposition of methane hydrate with and without alcohols at different temperatures. The results showed that the hydroxyl group of alcohol molecules close to methane hydrate tends to reorient toward methane hydrate. The formation of hydrogen bonds between alcohol and water in methane hydrate cages destabilises the (methane hydrate) structure, thus leading to its decomposition. We also studied the effects of temperature on alcohols used during methane hydrate decomposition by comparing the variations in total potential energy with temperature. We observed that 300 K is the turning point, when the temperature is lower than 300 K, the accelerating effect of alcohol on methane hydrate decomposition is more pronounced. Additionally, the effect of temperature was found to vary with alcohols. For methanol, temperature mainly affects the rate of diffusion; a high rate of diffusion accelerates the decomposition of methane hydrate. For glycerol, temperature mainly affects the interaction energy between glycerol and water, which can accelerate the decomposition of methane hydrate. Our work provides a theoretical basis for future researches into exploitation of methane hydrate by combining thermal stimulation and alcohol. (C) 2020 Published by Elsevier B.V.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Chemistry, like all the natural sciences, Safety of Dihydrofuran-2,5-dione, begins with the direct observation of nature¡ª in this case, of matter.108-30-5, Name is Dihydrofuran-2,5-dione, SMILES is O=C(CC1)OC1=O, belongs to tetrahydrofurans compound. In a document, author is Paszkiewicz, Sandra, introduce the new discover.

Biobased Thermoplastic Elastomers: Structure-Property Relationship of Poly(hexamethylene 2,5-furanodicarboxylate)-Block-Poly(tetrahydrofuran) Copolymers Prepared by Melt Polycondensation

A series of poly(hexamethylene 2,5-furanodicarboxylate)-block-poly(tetrahydrofuran) (PHF-b-F-pTHF) copolymers were synthesized using a two-stage procedure, employing transesterification and polycondensation. The content of pTHF flexible segments varied from 25 to 75 wt.%. H-1 nuclear magnetic resonance (NMR) and Fourier transformed infrared spectroscopy (FTIR) analyses were applied to confirm the molecular structure of the materials. Differential scanning calorimetry (DSC), dynamic mechanical measurements (DMTA), and X-ray diffraction (XRD) allowed characterizing the supramolecular structure of the synthesized copolymers. SEM analysis was applied to show the differences in the block copolymers’ morphologies concerning their chemical structure. The influence of the number of flexible segments in the copolymers on the phase transition temperatures, thermal properties, as well as the thermo-oxidative and thermal stability was analyzed. TGA analysis, along with tensile tests (static and cyclic), confirmed the utilitarian performance of the synthesized bio-based materials. It was found that an increase in the amount of pTHF caused the increase of both number-average and weight-average molecular weights and intrinsic viscosities, and at the same time causing the shift of the values of phase transition temperatures toward lower ones. Besides, PHF-b-F-pTHF containing 75 wt.% of F-pTHF units was proved to be a promising thermoplastic shape memory polymer (SMP) with a switching temperature of 20 degrees C.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 108-30-5. Safety of Dihydrofuran-2,5-dione.

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Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 3188-00-9, Name is 2-Methyltetrahydrofuran-3-one, formurla is C5H8O2. In a document, author is Meninno, Sara, introducing its new discovery. Product Details of 3188-00-9.

Diastereoselective Synthesis of Functionalized 5-Amino-3,4-Dihydro-2H-Pyrrole-2-Carboxylic Acid Esters: One-Pot Approach Using Commercially Available Compounds and Benign Solvents

A novel three-step four-transformation approach to highly functionalized 5-amino-3,4-dihydro-2H-pyrrole-2-carboxylic acid esters, starting from commercially available phenylsulfonylacetonitrile, aldehydes, and N-(diphenylmethylene)glycine tert-butyl ester, was developed. The one-pot strategy delivered this class of amidines bearing, for the first time, three contiguous stereocenters, in good to high yield and diastereoselectivity. The entire sequence was carried out using diethyl carbonate and 2-methyl tetrahydrofuran as benign solvents, operating under metal-free conditions. The process could be conveniently scaled-up, and the synthetic utility of the products was demonstrated.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, Product Details of 104-61-0104-61-0, Name is 5-Pentyldihydrofuran-2(3H)-one, SMILES is O=C1OC(CCCCC)CC1, belongs to tetrahydrofurans compound. In a article, author is Trindade, Emmely O., introduce new discover of the category.

Synthesis, in silico Study and Antimicrobial Activity of New Piperine Derivatives Containing Substituted delta-Esters

A series of fifteen new piperine-derived diesters was synthesized through the substitution reaction between the salt of piperic acid, obtained through piperine basic hydrolysis, with the delta-chloro-esters, obtained through the cleavage of tetrahydrofuran (THF) with acyl chlorides in the presence of ZnCl2. The final compounds were obtained with yields ranging from 50 to 84% and were characterized by infrared (IR) and H-1 and C-13 nuclear magnetic resonance spectroscopy (NMR). The new compounds were evaluated in silico in regard to their ADME (absorption, distribution, metabolism, and excretion) properties, and in vitro for their antimicrobial activity against bacteria strains (Staphylococcus aureus and Pseudomonas aeruginosas), yeast fungi (Candida albicans and C. tropicalis) and filamentous fungi (Aspergillus fumigatus, A. flavus and A. niger). The results from the in silico studies of Lipinski’s rule of five showed that most compounds present good pharmacological possibilities, and the results from in vitro antimicrobial activity showed that 8 of the 15 synthesized compounds displayed antimicrobial activity, inhibiting the growth of 40-80% of tested strains, with a minimum inhibitory concentration (MIC) interval ranging from 1024 to 256 mu g mL(-1).

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 104-61-0. Product Details of 104-61-0.

Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 7331-52-4, Name is (S)-4-Hydroxydihydrofuran-2(3H)-one, SMILES is O=C1OC[C@@H](O)C1, in an article , author is Kwon, Goomin, once mentioned of 7331-52-4, Quality Control of (S)-4-Hydroxydihydrofuran-2(3H)-one.

Cellulose nanocrystal-coated TEMPO-oxidized cellulose nanofiber films for high performance all-cellulose nanocomposites

High performance biopolymer films are of great interest as effective alternatives to non-biodegradable and petroleum-based polymer films. However, most natural biopolymer films possess weak mechanical and poor gas barrier properties, limiting their applicability. In this work, we developed all-cellulose nanocomposite films through a simple vacuum filtration process, using cellulose nanocrystals (CNCs) and 2,2,6,6-tetramethylpiperidine-1-oxy-oxidized cellulose nanofibers (TEMPO-CNFs). The TEMPO-CNFs were employed to construct a transparent, free-standing substrate matrix and the CNCs were used as a coating material to improve the mechanical and water vapor barrier properties of the final material. We have demonstrated that the top and bottom CNCs-coated TEMPO-CNF substrates (CNC/TEMPO-CNF/CNC) have excellent mechanical and good water vapor barrier properties. The resulting CNC/TEMPO-CNF/CNC films revealed a high tensile strength of 114 MPa and a low specific water vapor transmission rate (SWVTR) of 19 g.mm/m(2).day. In addition, the CNC/TEMPO-CNF/CNC films were resistant to various solvents including water, ethanol, tetrahydrofuran (THF), and acetone. This type of high performance cellulose nanocomposite can be used as a renewable material for a broad range of potential applications.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 104-67-6, Name is Undecanoic gamma-Lactone, molecular formula is C11H20O2, belongs to tetrahydrofurans compound. In a document, author is Bonitatibus, Peter J., Jr., introduce the new discover, Name: Undecanoic gamma-Lactone.

Preparation and crystal structure of a non-symmetrical vanadium(II) dimer: tri-mu(2)-bromido-(hydrogen-tris(3-isopropyl-4-bromopyrazol-1-yl) borato-kappa(3) N,N ‘,N ”)-tris(tetrahydrofuran-kappa O)divanadium(II)-tetrahydrofuran (1/1), C34H57BBr6N6O4V2

C34H57BBr6N6O4V2, orthorhombic, Pna2(1) (no. 33), a= 17.198(2) angstrom, b =12.9497(11) angstrom, c= 20.496(2) angstrom, V = 4564.8(9) angstrom(3) , Z = 4, R-gt(F) = 0.0441, wR(ref)(F-2) = 0.1093, T = 183(2) K.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law. In my other articles, you can also check out more blogs about 104-67-6. Name: Undecanoic gamma-Lactone.

Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 5061-21-2, Name is 2-Bromo-4-butanolide, molecular formula is C4H5BrO2. In an article, author is Ma, Xiaoqin,once mentioned of 5061-21-2, Formula: C4H5BrO2.

Effect of different molecular architectured POSS-fluoropolymers on their self-assembled hydrophobic coatings

A total of 1/2/4/6-armed molecular architectured polyhedral oligomeric silsesquioxane (POSS) fluoropolymers were synthesized via atom transfer radical polymerization (ATRP) by linear (L), dicephalus (D), four-arm (T), and six-arm (S) initiators initiating same content of methyl methacrylate (MMA), methacrylate POSS (MA-POSS), and dodecafluoroheptyl methacrylate (DFHM). The obtainedL/D/T/S-(PMMA-b-PMAPOSS-b-PDFHM)(1/2/4/6) had increased molecular weight with arm increase. Driven by the stereo-hindrance and curvature effects of segments in tetrahydrofuran (THF), they assembled into the decreased spherical core-shell micelles (250-100 nm) with arm increase as PMA-POSS/PDFHM core and PMMA shell. Because of easy surface migration of fluorine-containing groups in small micelles, the casted film byS-(PMMA-b-PMAPOSS-b-PDFHM)(6) performed the fluorine-rich (46.44%) and rough (5.41 nm) surface, and therefore with the hydrophobic (112 degrees) and low water adsorption surface (1522 ng/cm(2)). Also, POSS-fluoropolymers obtained the enhanced thermostability with arm increase. It is believed that this research will provide a bright view for design and application of POSS-fluoropolymers.

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Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem

Chemistry is an experimental science, Computed Properties of C4H6O3, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 7331-52-4, Name is (S)-4-Hydroxydihydrofuran-2(3H)-one, molecular formula is C4H6O3, belongs to Tetrahydrofurans compound. In a document, author is Chowhan, L. Raju.

Stereoselective synthesis towards (+)-trans-kumausyne employing vinylogous Mukaiyama type reaction on an alpha-chloro sulfide

A stereoselective synthesis towards (+)-trans-lcumausyne is disclosed. The key steps of the synthesis include stereoselective C-C formation employing vinylogous Mukaiyama type reaction of an a-chloro sulfide with 2-trimethylsiloxy furan and base-catalyzed isomerization followed by intramolecular oxa-Michael reaction.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law. In my other articles, you can also check out more blogs about 7331-52-4. Computed Properties of C4H6O3.

Reference:
Tetrahydrofuran – Wikipedia,
,Tetrahydrofuran | (CH2)3CH2O – PubChem