Tag: M.W:100-200

Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 3188-00-9, Name is 2-Methyltetrahydrofuran-3-one, molecular formula is C5H8O2, belongs to tetrahydrofurans compound. In a document, author is Lee, Seulah, introduce the new discover, Formula: C5H8O2.

Calvatianone, a Sterol Possessing a 6/5/6/5-Fused Ring System with a Contracted Tetrahydrofuran B-Ring, from the Fruiting Bodies of Calvatia nipponica

Calvatia nipponica is an extremely rare mushroom with a limited number of studies on its chemical components and biological activities published. Here we report the isolation of a novel sterol, calvatianone (1), possessing a 6/5/6/5-fused ring system with a contracted tetrahydrofuran B-ring, and four known steroids (2-5) from the fruiting bodies of C. nipponica. The structure of calvatianone including its absolute configuration was determined by NMR spectroscopic analyses, HR-ESIMS, gauge-including atomic orbital NMR chemical shift calculations, and ECD calculations. Ergosterol peroxide (3) and cyathisterol (4) suppressed the cell viability increase induced by 17 beta-estradiol in MCF-7 breast cancer cell lines, suggesting a possible approach for these compounds to serve as ER alpha antagonists.

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 3188-00-9. Formula: C5H8O2.

Reference:
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. 7331-52-4, Name is (S)-4-Hydroxydihydrofuran-2(3H)-one, formurla is C4H6O3. In a document, author is Elahi, Fazal, introducing its new discovery. Computed Properties of C4H6O3.

Speciation and determination of chromium by ultrasound-assisted deep eutectic solvent liquid-liquid microextraction followed by flame atomic absorption spectrometry

In the present study, an ultrasound-assisted deep eutectic solvent liquid-liquid microextraction (UA-DES-LLME) technique was developed for selective speciation, extraction, and preconcentration of chromium species followed by quantitation by flame atomic absorption spectrometry. The effective parameters of the applied method comprising pH, composition and volume of the deep eutectic, volume of ammonium pyrrolidine dithiocarbamate complexing agent, volume of tetrahydrofuran, time of ultrasonication and centrifugation were optimized. The proposed method at optimum values of all factors was used for determination of Cr(VI). For evaluation of total chromium species, added KMnO4(strong oxidizing agent) into the sample, and heated for 2 min to convert Cr(III) into Cr(VI) and determined. The Cr(III) concentration was obtained from the difference between Cr(VI) from total chromium. Under the optimal conditions, preconcentration factor (PF), limit of detection (LOD), and limit of quantification (LOQ) were found as 50, 0.8 mu g L(-1)and 3.2 mu g L-1, respectively. The relative standard deviation (RSD %) was found < 5.0%. Finally, the developed method was used for the determination of Cr(VI) and Cr(III) in tea and water samples. If you are hungry for even more, make sure to check my other article about 7331-52-4, Computed Properties of C4H6O3.

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

Reference of 19444-84-9, As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world. 19444-84-9, Name is 3-Hydroxydihydrofuran-2(3H)-one, SMILES is OC1CCOC1=O, belongs to tetrahydrofurans compound. In a article, author is de Oliveira, Edison Rogerio Marques, introduce new discover of the category.

Optimal Experimental Conditions for Improving the Yield of Poly(limonene) from Photoinduced Polymerization

Limonene represents a possible candidate for the synthesis of polymers from renewable sources. However, because of some structural characteristics, the process yield tends to be considerably low (< 10%). In this sense, the evaluation of still unexplored alternative controlled strategies of synthesis, together with techniques of process optimization, can enable the increase in the polymer yield. Taking this into consideration, this study presents, for the first time, the optimal conditions for maximizing the poly(limonene) yield using a photoinduced polymerization route. The reactions were all conducted at a mild temperature (40 degrees C) and the polymer was characterized by nuclear magnetic resonance (H-1-NMR and C-13-NMR). A face-centered design (FCD) was proposed for interpreting the effects of the reagent ratio (initiator, catalyst, and electron donor amine) on the polymerization. The monomer molar ratio was set to 100 with 6 h of polymerization time. All reagents exerted significant and positive effects on the yield, with the initiator having the most pronounced effect. The optimal conditions for maximizing the yield were as follows: molar ratios of the electron donor amine (PMDETA): 5-8.5; catalyst (TX): 1-1.7; and initiator (TBE): 1.7. Thus, similar to 18% yield could be achieved using a molar ratio of 100:8.5:1.7:1.7 (monomer:PMDETA:TX:TBE). It was observed that the polymer had good adhesion to steel when dried and moderate adhesion to glass. The polymer was insoluble in water and soluble in ethanol, tends to form suspension in solution of ethanol/water, in addition to being partially soluble in tetrahydrofuran and chloroform. These characteristics indicate that the material prepared herein is a promising renewable additive for coatings, films, or adhesives. [GRAPHICS] . Reference of 19444-84-9, The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 19444-84-9 is helpful to your research.

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. 79-50-5, Name is 3-Hydroxy-4,4-dimethyldihydrofuran-2(3H)-one, molecular formula is C6H10O3, belongs to Tetrahydrofurans compound. In a document, author is Rizk, Mohamed Mohamed Salem, introduce the new discover, SDS of cas: 79-50-5.

A Rapid and reliable thin-layer chromatographic method for the simultaneous estimation of celecoxib and diacerein in their binary mixture using nanosilica gel plate

A novel, rapid, and sensitive stability-indicating high-performance thin-layer chromatography method was developed and validated for the simultaneous determination of celecoxib (CEL) and diacerein (DIA) in bulk and a capsule binary mixture. The complete separation was achieved by the proposed method on nanosilica gel F-254 plates using n-hexane-ethyl acetate-tetrahydrofuran-glacial acetic acid (7:3:1:0.8, V/V) as the mobile phase. The chromatographic bands were visualized using short-wave ultraviolet light, and the amount of CEL and DIA was determined by scanning densitometry at 254 nm using the peak area. The R-F values were 0.59 and 0.37 for CEL and DIA, respectively. From regression plots, it was found that good linearity was achieved in the concentration ranges of 20.00-320.00 ng/band and 5.00-80.00 ng/band with mean percentage recoveries 99.86 +/- 0.70 and 99.64 +/- 0.96 for CEL and DIA, respectively. The proposed method was validated according to the International Conference on Harmonisation guidelines. The statistical analysis of the results revealed high accuracy and precision, the suggested procedures could be used as a stability-indicating assay for the simultaneous determination of CEL and DIA in bulk drug and their capsule binary mixture in the presence of their degradation products.

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 79-50-5. SDS of cas: 79-50-5.

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

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Song, Shaofei, once mentioned the application of 79-50-5, Name is 3-Hydroxy-4,4-dimethyldihydrofuran-2(3H)-one, molecular formula is C6H10O3, molecular weight is 130.14, MDL number is MFCD00064333, category is Tetrahydrofurans. Now introduce a scientific discovery about this category, Quality Control of 3-Hydroxy-4,4-dimethyldihydrofuran-2(3H)-one.

Crystallization-Driven Self-Assembly of a Block Copolymer with Amphiphilic Pendant Groups

Crystalline-coil block copolymers (BCPs) with an amphiphilic corona-forming block broaden the range of solvents in which crystallization-driven self-assembly experiments can be carried out. These materials allow one to examine how rather large changes in solvent polarity can affect the self-assembly process, leading to novel uniform structures. Here, we describe the synthesis and self-assembly properties of a crystalline-brush BCP, PFS27-b-P(EG-E) MA(48) (PFS, poly(ferrocenyldimethylsilane), and P(EG-E)MA, poly(tetraethylene glycol monododecyl ether methacrylate); the subscripts refer to the mean degrees of polymerization). Tetrahydrofuran (THF) is a common good solvent for both blocks, whereas the corona polymer itself is soluble in alcohols ranging from 2-propanol to 1-decanol and in octane and decane. Self-assembly in 2-propanol was normal, forming long (>5 mu m) fiber-like micelles of uniform width when the polymer suspended in solvent was heated (i.e., 80 degrees C) and cooled. Micelles of similar width but uniform and variable length were obtained when micelle fragments were subjected to seeded growth or self-seeding conditions. In primary alcohols (1-butanol to 1-decanol), direct self-assembly led to uniform scarf-like structures (total length similar to 2 mu m) in which the length of the central platelet increased with the carbon number in the solvent, offset by shorter fiber-like protrusions at the ends. We speculate that these changes are related to the temperature at which core crystallization occurred as the samples cooled. Selfassembly in decane was more complicated. Large (>10 mu m) aggregated structures consisting of fiber bundles formed initially. Sonication followed by seeded growth with additional BCP or self-seeding led to relatively uniform elongated lenticular micelles, substantially wider than those formed under these protocols for this BCP in 2-propanol. Solvent polarity has a profound effect on the self-assembly of this BCP with a brush-like amphiphilic corona-forming block.

Do you like my blog? If you like, you can also browse other articles about this kind. Thanks for taking the time to read the blog about 79-50-5, Quality Control of 3-Hydroxy-4,4-dimethyldihydrofuran-2(3H)-one.

Reference:
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. 108-30-5, Name is Dihydrofuran-2,5-dione, formurla is C4H4O3. In a document, author is Kato, Shota, introducing its new discovery. SDS of cas: 108-30-5.

Total synthesis and complete configurational assignment of amphirionin-2

Amphirionin-2 is a linear polyketide metabolite that exhibits potent and selective cytotoxic activity against certain human cancer cell lines. We disclose herein the first total synthesis of amphirionin-2 and determination of its absolute configuration. Our synthesis featured an extensive use of cobalt-catalyzed Mukaiyama-type cyclization of gamma-hydroxy olefins for stereoselective formation of all the tetrahydrofuran rings found in the natural product, and a late-stage Stille-type coupling for convergent assembly of the entire carbon backbone. Four candidate diastereomers of amphirionin-2 were synthesized in a unified, convergent manner, and their spectroscopic/chromatographic properties were compared with those of the authentic material. The present study culminated in the reassignment of the C5/C7 relative configuration, assignment of the C12/C18 relative configuration, and determination of the absolute configuration of amphirionin-2.

If you are hungry for even more, make sure to check my other article about 108-30-5, SDS of cas: 108-30-5.

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. Category: tetrahydrofurans, 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 Zhang, Huihui, once mentioned of 492-62-6.

Palladium-Catalyzed Asymmetric [3+2] Cycloaddition of Vinylethylene Carbonates with 2-Arylidene-1,3-Indandiones: Synthesis of Tetrahydrofuran-Fused Spirocyclic 1,3-Indandiones

An asymmetric [3+2] cycloaddition of 2-arylidene-1,3-indandiones with vinylethylene carbonates (VECs) had been achieved in the presence of Pd(2)dba(3)center dot CHCl(3)and axially chiral phosphoramidite ligand. The reaction of various substituted VECs and 2-arylidene-1,3-indandiones proceeded smoothly under mild conditions, giving the highly functionalized spirocyclic 1,3-indanedione derivatives in good to excellent yield with moderate diastereoselectivity and high enantioselectivity. The reaction on the gram scale had also been demonstrated.

But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 492-62-6, you can contact me at any time and look forward to more communication. Category: tetrahydrofurans.

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

Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology. 104-61-0, Name is 5-Pentyldihydrofuran-2(3H)-one, molecular formula is , belongs to tetrahydrofurans compound. In a document, author is Dung, Nguyen Thi Kim, SDS of cas: 104-61-0.

Effect Of Magnesium Perchlorate Content on the Mechanical, Thermal Stability, and Dielectric Properties of Plasticized PMMA/PVC-g-PMMA Electrolytes

In this study, new types of gel polymer blend electrolytes (GPBEs) were prepared with the synthesized PVC-g-PMMA graft copolymer, PMMA, plasticizers (propylene carbonate (PC), dioctyl phthalate (DOP)), and different loadings of Mg(ClO4)(2) via the solution casting method using tetrahydrofuran as solvent. Fourier transform infrared (FTIR) spectra of the electrolytes showed mutual molecular interactions between Mg(ClO4)(2) and organic moieties. The scanning electron microscopy images of the GPBEs showed their wrinkled surface morphology due to their low elastic modulus and high flexibility. Energy-dispersive X-ray (EDX) spectroscopy and mapping technique revealed the regular distributions of all atomic elements such as Cl, Mg, O, and C in the doped GPBEs. With increasing the Mg salt concentration, Young’s modulus and tensile strength of the GPBEs strongly decreased. Interestingly, the elongation at break of the GPBEs was higher than that of neat (undoped) GPBE and achieved the highest value of 215% at the salt content of 20 wt.%. The AC conductivity and ionic conductivity, as well as dielectric permittivity of plasticized PMMA/PVC-g-PMMA/Mg(ClO4)(2) GPBE,s increased with frequency and Mg(ClO4)(2) doping content. Ionic conductivity of the doped GPBEs can be achieved from 5.51×10(-5) to 4.42×10(-4) (S.cm(-1)) using Mg(ClO4)(2) contents in the range from 10 to 40 wt.%. The doped GPBEs are thermally stable up to 100 degrees C with very low weight losses. The GPBE doped with 20 wt.% of Mg(ClO4)(2) can be used as a new type of electrolyte for developing Mg batteries.

If you are hungry for even more, make sure to check my other article about 104-61-0, SDS of cas: 104-61-0.

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

Chemistry is an experimental science, Name: (S)-4-Hydroxydihydrofuran-2(3H)-one, 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 Yan, Qiangu.

Issues in Preparation of Metal-Lignin Nanocomposites by Coprecipitation Method

Chemical coprecipitation technique is proven to be a beneficial method to prepare uniformly mixed catalyst metal and Kraft lignin precursors. Coprecipitation is a simple, yet very complex process which is highly sensitive to the reaction conditions, particularly temperature. In an exothermic coprecipitation process, the reaction rate can become uncontrollable over certain temperatures which could lead to a thermal runaway reaction. In this work, metal-lignin nanocomposites were synthesized by coprecipitation of metal (M) salts and Kraft lignin. Kraft lignin and metal salts were dissolved in organic solvents and DI water, respectively, to make lignin solution/suspension and metal salt aqueous solution. The aqueous solutions of metal salts were then added to the lignin solutions/suspensions and mixed well, resulting in chelation of transition metal ions to the functional groups of lignin chains and co-precipitation of metal-lignin composites from the solvents. To develop a safe process for producing M-lignin composites in a large volume, potential reactions, exothermic or endothermic processes, hazards gases, and volatiles were evaluated during the coprecipitation process. The effects of transition metal type, solvent selection, concentration of metal salts, and initial solution temperature on the interactions between metal ions and Kraft lignin, metal uniformity in the lignin matrix, and morphology of the metal-lignin composites were investigated during the coprecipitation process. Cu, Mo, Ni, and Fe were investigated as the transition metals for the metal-lignin composites. Fenton or Fenton-like reactions were discovered to occur during the Fe- and Cu-lignin coprecipitation process and tremendous heat evolved, which lead to the overshoot of the reaction system temperature in a very short time (i.e. a few seconds). Significant amounts of CO(2)and toxic NO(2)gasses were released during the coprecipitation process when Fenton or Fenton-like reactions occurred. No interaction or a very weak interaction occurred between lignin and Mo(VI) ions when mixing both solutions. Ni ions were coordinated strongly to oxygen-containing functional groups in lignin, but no Fenton or Fenton-like reaction was detected during Ni-lignin coprecipitation. Fenton reaction or Fenton-like reaction occurred when tetrahydrofuran (THF) and acetone were used to dissolve Kraft lignin, and the reaction became highly fierce and unmanageable with increasing of iron content in the composite. The reaction initialization time was shortened with increase of initial solution temperature and thermal runaway reaction might occur if the initial mixing temperature reached 60 degrees C or above.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 7331-52-4, in my other articles. Name: (S)-4-Hydroxydihydrofuran-2(3H)-one.

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

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 97-99-4, Name is (Tetrahydrofuran-2-yl)methanol, molecular formula is C5H10O2. In an article, author is Uttaravalli, Appala Naidu,once mentioned of 97-99-4, Name: (Tetrahydrofuran-2-yl)methanol.

Studies on development of adhesive material from post-consumer (waste) expanded polystyrene: a two-edged sword approach

In the present study, low-cost adhesive materials are prepared by valorizing a post-consumer (waste) expanded polystyrene (EPS). The adhesives are prepared by dissolving the waste EPS in six different solvents namely n-butyl acetate (n-BA), tetrahydrofuran (THF), methyl ethyl ketone (MEK), m-xylene, carbon tetrachloride (CTC) and gasoline, and the corresponding additives are designated as AD-B, AD-T, AD-M, AD-X, AD-C, and AD-G, respectively. Various physico-chemical properties such as solubility, moisture content, viscosity, adhesive (shear) strength, shear modulus, etc. of the adhesives are characterized in detail. Among the chosen solvents, the solvent MEK offered maximum solubility of the EPS. Paper and wood-based substrates were used to quantify the adhesive strength of the in-house developed adhesives. The study revealed that the in-house prepared adhesives are appropriate to stick paper and wood-based substrates. The adhesive strength of the adhesives is also compared with commercial adhesives namely fevistick and fevicol. The order of shear strength of the studied adhesives for wood as a substrate is AD-X < AD-B < AD-T < AD-M < fevicol. The obtained value of shear strength of AD-X, AD-B, AD-T, AD-M, and fevicol is 1081, 1372, 3791, 4407, and 4722 kPa, respectively. The investigation shows that the shear strength of AD-M is comparable (around 7 % lower) with the shear strength of the commercial fevicol. The in-house developed adhesives show more elastic in nature compared to the fevicol adhesive. The study further revealed that the in-house developed adhesives are also suitable to bind clay and ceramic-based substrates. From the investigation, it can be concluded that the EPS derived additives can be used as a suitable substitute for commercial adhesives to bind various materials. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 97-99-4, you can contact me at any time and look forward to more communication. Name: (Tetrahydrofuran-2-yl)methanol.

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