Day: March 24, 2021

Application of 5061-21-2, Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. 5061-21-2, Name is 2-Bromo-4-butanolide, SMILES is O=C1C(CCO1)Br, belongs to Tetrahydrofurans compound. In a article, author is Roa, Diego A., introduce new discover of the category.

Mild reduction with silanes and reductive amination of levulinic acid using a simple manganese catalyst

A manganese-based catalytic system using the commercially available complex [Mn(CO)(5)Br] was studied for the selective reduction of levulinic acid (LA) to 2-methyl-tetrahydrofuran (MTHF). We further studied the production of pyrrolidines via its reductive amination using silanes (phenylsilane and tetramethyldisiloxane). The results showed high efficiency and selectivity for this reaction leading to high yields using mild reaction conditions.

Application of 5061-21-2, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 5061-21-2 is helpful to your research.

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. 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 Zhu, Ming, once mentioned of 492-62-6, HPLC of Formula: C6H12O6.

Self-Assembly CNTs@PANi Coffee Rings on Poly(styrene-ethylene-butylene-styrene) Triblock Copolymer for Largely Stretchable Electronics

In this paper, CNTs@PANi nanocomposites were prepared by in-situ oxidation polymerization of aniline, and their structure, morphology and conductivity were characterized. A mixed solvent of toluene and tetrahydrofuran was used to prepare dispersions of CNTs@PANi and poly(styrene-ethylene-butylene-styrene) (SEBS) triblock copolymer, and bilayer composite film was prepared. According to the solvent phase separation and uneven evaporation flux, CNTs@PANi self-assembled into the interconnected coffee ring structure on the SEBS matrix. The prepared bilayer composite film had excellent stretchability, and the conductivity of the functional layer was close to that of CNTs@PANi, which could light up an LED lamp under 100% strain and restore the topological structure. Electrochemical tests showed that the bilayer film had obvious heterogeneity. The impedance characteristics of the CNTs@PANi functional layer and the SEBS matrix were analyzed, and its heterogeneous corrosion resistance mechanism further discussed.

Interested yet? Read on for other articles about 492-62-6, you can contact me at any time and look forward to more communication. HPLC of Formula: C6H12O6.

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. 19444-84-9, Name is 3-Hydroxydihydrofuran-2(3H)-one, molecular formula is C4H6O3. In an article, author is Mallurwar, Naveen Kumar,once mentioned of 19444-84-9, Category: tetrahydrofurans.

Stereoselective Approaches for Building the C14-C21 Fragment of Eribulin

Herein, we report a practical stereoselective synthesis of C14-C21 and C15-C21 tetrahydrofuran-based fragment of eribulin using two different approaches. The approach utilizes iodoetherification and intra molecular oxa-Michael additions as key steps in individual approaches using R,R-tartaric acid and L-ascorbic acids as cost effective chiral starting materials.

Interested yet? Keep reading other articles of 19444-84-9, you can contact me at any time and look forward to more communication. Category: tetrahydrofurans.

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

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, HPLC of Formula: C5H10O2, 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 Fan, Shuanshi,once mentioned of 97-99-4.

Reduction Clathrate Hydrates Growth Rates and Adhesion Forces on Surfaces of Inorganic or Polymer Coatings

Hydrate plugging is one of the major risks for oil and gas transportation in pipelines. To mitigate the adhesion between hydrate particles and pipeline walls, hexagonal boron nitride (HBN), polydimethylsiloxane (PDMS), and fluoro-coating (F-coating) were added with hydrophobic fuming SiO2 as coating materials, which were coated on four different substrates (X70 steel, X80 steel, zirconia plate (ZrO2), and tinplate). The adhesion force between tetrahydrofuran (THF) hydrate particles and coated substrates was measured by a micromechanical force apparatus (MMF). For the X70 substrate with F-coating, the adhesion force was reduced by 80.3% when the mass fraction of SiO2 was increased from 1 wt % (0.0152 N/m) to 4 wt % (0.0030 N/m). SiO2 exhibits hydrate-phobic properties. The adhesion forces were 0.0105, 0.0027, and 0.0043 N/m for X80 (bare), X80+HBN, and X80+PDMS. PDMS+SiO2 (1-4 wt %) coating was found able to slow the growth rate of hydrate. In a high-pressure reactor, methane hydrate growth on PDMS+SiO2 (4 wt %) coating on the tinplate substrate was studied. No growth of methane hydrate on the coated layer was observed, while there was full coverage on the noncoated layer. The presence of coating was found effective for hindering the growth and attachment of both THF and methane hydrates. Surface morphology was believed to be one of the main factors affecting the adhesion and growth characteristics of hydrate particles. Hydrate-phobic coating has been put forward in this work that refers to a functional coating that prevents hydrates.

If you¡¯re interested in learning more about 97-99-4. The above is the message from the blog manager. HPLC of Formula: C5H10O2.

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

Let¡¯s face it, organic chemistry can seem difficult to learn, HPLC of Formula: C11H20O2, Especially from a beginner¡¯s point of view. Like 104-67-6, Name is Undecanoic gamma-Lactone, molecular formula is tetrahydrofurans, belongs to tetrahydrofurans compound. In a document, author is Wang, Dongdong, introducing its new discovery.

Dynamic responses of THF hydrate-bearing sediments under small strain: Resonance column test

Knowledge of the dynamic responses of hydrate-bearing sediments under small strain conditions is a fundamental issue in terms of evaluating the stability of gas hydrate-bearing layers under natural forces, such as eustatic sea level and earthquakes as well as artificial activities for example gas production from hydrate reservoirs. However, this issue has not yet been fully understood. In this study, a customized hydrate resonance column was utilized to measure the dynamic response of tetrahydrofuran hydrate-bearing sediments with different conditions. The results show that the shear modulus increases exponentially with increases in the confining pressure or decreases in the shear strain, while the damping ratios decrease exponentially under identical conditions. Under the same confining pressure, the shear modulus and damping ratio increases as hydrate saturation rises. The stress sensitivity index (b) of shear modulus decreases monotonically with an increase in hydrate saturation. The shear modulus is negatively correlated with porosity when the tetrahydrofuran (THF) hydrate is predominantly pore-filling type, and the damping ratio and sensitivity index b are positively correlated with porosity. However, when the hydrate is mainly load-bearing type, the shear modulus and damping are both related positively with porosity. This is because the total amount of hydrate in specimens with identical hydrate saturation increases with higher porosity, while the sensitivity index b is negatively related to porosity. The hydrate formed in pores leads to a normal increase in the shear modulus and an abnormal increase in the damping, due to trace amounts of residual water between the surface of the hydrate and the particles. This study provides a basis for the comprehensive understanding of the dynamic responses of hydrate-bearing sediments under small strains. It is of great significance for seismic or sonic well logging evaluations on gas hydrate saturation and its dissociation degree in hydrate reservoirs.

If you are hungry for even more, make sure to check my other article about 104-67-6, HPLC of Formula: C11H20O2.

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. 706-14-9, Name is gamma-Decanolactone, molecular formula is C10H18O2. In an article, author is Liu, Yong-zheng,once mentioned of 706-14-9, SDS of cas: 706-14-9.

Solid-liquid equilibrium solubility, thermodynamic properties and solvent effect of 3,4-dinitro-1H-pyrazole in different pure solvents

Knowledge of solubility and thermodynamic properties of 3,4-dinitro-1H-pyrazole (DNP) within different solvents are essential in the processes of crystallization and further theoretical studies. In this study, the solubility of DNP in 12 pure solvents (i.e., water, n-propanol, isobutyl alcohol, n-pentanol, isoamyl alcohol, xylene, ethyl acetate, epichlorohydrin, chloroform, acetonitrile, tetrahydrofuran and 2-butanone) has been determined by using gravimetric method within the temperature range of (283.15-323.15) K under atmospheric pressure. Good dissolution ability was found for DNP in the organic solvents we studied. The sequence of the mole fraction solubility is tetrahydrofuran >2-butanone > n-propanol > n-pentanol > isobutyl alcohol > isoamyl alcohol > acetonitrile > ethyl acetate > epichlorohydrin > xylene > water > chloroform. Solubility of DNP increased with the increasing temperature in each pure solvent. In addition, solubility data was correlated by four models including the modified Apelblat equation, NRTL model, Wilson model and Two-Suffix Margules model. The maximum rootmean-square deviation (10(4)RMSD) was 715.47. Basically speaking, values of R-2 and 10(4)RMSD between experimental and calculated solubility showed that NRTL model provided most satisfactory fitting results in this work. Moreover, Hansen solubility parameters (delta(d), delta(p), delta(h), delta(t), delta(v) and Delta delta(t)) were used to describe the dissolution characteristics of solid in different solvents. Then, the Kamlet-Taft parameters (alpha, beta and pi*) were explained to investigate the solvent effect on DNP solubility. Furthermore, other parameters, including mixing enthalpy (Delta H-mix) mixing entropy (Delta S-mix) and mixing Gibbs energy (Delta(mix)G) were calculated according to the Wilson model, and their results have been discussed on the basis of experimental data. It has been found that all mixing Gibbs energy are less than zero, hence, the dissolution of DNP is a spontaneous process. (C) 2020 Elsevier B.V. All rights reserved.

Interested yet? Keep reading other articles of 706-14-9, you can contact me at any time and look forward to more communication. SDS of cas: 706-14-9.

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

Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 104-67-6, Name is Undecanoic gamma-Lactone, molecular formula is C11H20O2, belongs to tetrahydrofurans compound, is a common compound. In a patnet, author is Grobelny, Zbigniew, once mentioned the new application about 104-67-6, Application In Synthesis of Undecanoic gamma-Lactone.

New way of anionic ring-opening copolymerization of beta-butyrolactone and epsilon-caprolactone: determination of the reaction course

Poly(epsilon -caprolactone)-block-poly(beta -butyrolactone) copolymers were prepared in two-step synthesis. Firstly, poly(epsilon -caprolactone) (PCL) was obtained by anionic ring-opening polymerization of CL initiated with anhydrous KOH activated 12-crown-4 cation complexing agent. Reaction was carried out in tetrahydrofuran solution and argon atmosphere at room temperature. Then, beta -butyrolactone (BL) and 18-crown-6 were added to the system, resulting in PCL-block-PBL copolymer, which contains after methylation hydroxyl starting group and methyl ester end group. The main product was contaminated with PCL and PBL homopolymers formed in a side reactions. C-13 NMR technique was used for determination of chemical structure of polymers obtained. The course of the studied processes was proposed. MALDI-TOF technique was used to reveal the macromolecules’ architecture where several series were found. The identified series shown that mainly copolymeric macromolecules were formed with scare contribution of homopolymeric polybutyrolactone with trans-crotonate starting groups and polycaprolactone, which is congruent with the proposed reaction mechanism. Moreover, critical approach concerning previously reported PCL-block-PBL copolymer synthesis by use of NaH as initiator was also presented.

We¡¯ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, 104-67-6. The above is the message from the blog manager. Application In Synthesis of Undecanoic gamma-Lactone.

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

Application of 97-99-4, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 97-99-4, Name is (Tetrahydrofuran-2-yl)methanol, SMILES is OCC1OCCC1, belongs to Tetrahydrofurans compound. In a article, author is Mirzaee, Mahsa Torabi, introduce new discover of the category.

In-tube stir bar sorptive extraction based on 3-aminopropyl triethoxysilane surface-modified Ce-doped ZnAl layered double hydroxide thin film for determination of nonsteroidal anti-inflammatory drugs in saliva samples

A thin-film based on 3-aminopropyl triethoxysilane surface-modified Ce-doped zinc-aluminum layered double hydroxide was synthesized on the inner surface of an aluminum tube. It has been applied to in-tube stir bar sorptive extraction of nonsteroidal anti-inflammatory drugs in saliva samples followed by high-performance liquid chromatography. The sorbent was characterized by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and elemental mapping. The extraction parameters including sample pH (4.2), extraction time (10 min), stirring speed (800 rpm), type of eluent (acidified tetrahydrofuran), eluent volume (100 mu L), and desorption time (6 min) were thoroughly optimized. Under the optimum conditions, limits of detection were found to be less than 5.0 ng mL(-1). Calibration plots were linear within the range 10-1000 ng mL(-1)(R-2 > 0.9982). Absolute recoveries were calculated in the range 63.5 to 72.4%. The repeatability (intra- and inter-day precision) and reproducibility (tube-to-tube precision) at concentrations of 50, 250, and 500 ng mL(-1)were less than 7.6% and 9.4%, respectively. The method accuracy based on the relative error was calculated at these concentrations and ranged from – 4.9 to – 9.3% for intra-day relative error (%) and – 6.8 to – 11% for inter-day relative error (%). Finally, the method applicability was examined for the determination of nonsteroidal anti-inflammatory drugs in saliva samples, and good relative recoveries were obtained within the range 86.5 to 95.2%. As a result, the introduced method can be applied as a suitable alternative to measuring nonsteroidal anti-inflammatory drugs in biological fluids.

Application of 97-99-4, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 97-99-4 is helpful to your research.

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

Synthetic Route of 63-42-3, 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. 63-42-3, Name is Lactose, SMILES is O=C[C@@H]([C@H]([C@@H]([C@@H](CO)O)O[C@H]1[C@@H]([C@H]([C@H]([C@@H](CO)O1)O)O)O)O)O, belongs to tetrahydrofurans compound. In a article, author is Soylak, Mustafa, introduce new discover of the category.

A new strategy for the combination of supramolecular liquid phase microextraction and UV-Vis spectrophotometric determination for traces of maneb in food and water samples

A novel and green method was developed for enrichment of maneb (manganese ethylene-bisdithiocarbamate) with a supramolecular solvent liquid phase microextraction method. The microextraction method has been used for the first time in the literature for separation-preconcentration of maneb. 1-decanol and tetrahydrofuran were used in the supramolecular solvent formation. The Mn2+ content of maneb was extracted in the supramolecular solvent phase as 1-(2-pyridylazo)-2-naphthol complex at pH 12.0. Manganese concentration was determined by UV-Vis spectrophotometer at 555 nm. Then, the maneb concentration equivalent to manganese concentration was calculated. The analytical parameters which effective in the method, including pH, volume of reagents, and sample volume were optimized. The limit of detection and the limit of quantification values for maneb were calculated as 2.22 mu g L-1 and 7.32 mu g L-1, respectively. The method was successfully applied in the analysis of the maneb content of water and food samples.

Synthetic Route of 63-42-3, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about 63-42-3 is helpful to your research.

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. SDS of cas: 149809-43-8, 149809-43-8, Name is ((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)tetrahydrofuran-3-yl)methyl 4-methylbenzenesulfonate, SMILES is O=S(C1=CC=C(C)C=C1)(OC[C@H]2CO[C@](C3=CC=C(F)C=C3F)(CN4N=CN=C4)C2)=O, in an article , author is Li, Zi-Han, once mentioned of 149809-43-8.

Breaking the axiality of pentagonal-bipyramidal dysprosium(iii) single-molecule magnets with pyrazolate ligands

A range of pyrazolate-based ligands have been used to balance the multidentate-chelating feature and the magnetic axiality in destroyed pentagonal-bipyramidal (DPB) dysprosium(iii) single-molecule magnets (SMMs). This family of complexes are air-stable and share the general formulae of [(DyXX2)-X-1(L-eq)(5)][BPh4], where X-1 and X-2 are the anionic axial ligands, including pyrazolate-based ligands and chloride; L-eq is the equatorial solvent molecule such as tetrahydrofuran (THF), pyridine (py) and thiazole (NS). Compared to the prototype PB SMMs, the bidentate-chelating features of the pyrazolate ligands show, albeit slow magnetic relaxation behavior, a much smaller energy barrier for magnetization reversal (U-eff). Static electronic calculation shows that the magnetic axiality above the ground m(J) = +/- 15/2 states has been much reduced, leading to the mixing of other states at higher levels. Nevertheless, this systematic study reveals that the variation of the substituents on the pyrazolate ligands and the replacement of planar solvents are effective at influencing the magnetic relaxation behavior. We found that the chloride coordinating mono-pyrazolate complexes, such as [(DyXCl)-Cl-1(THF)(5)][BPh4] (X-1 = 3-(trifluoromethyl)pyrazole (tfpz) 1, X-1 = 3-methylpyrazole (Mepz) 2, X-1 = 3-isopropyl-1H-pyrazole (Iprpz) 3, X-1 = 3,5-dimethylpyrazole (Me(2)pz) 4, X-1 = 3,5-diisopropylpyrazole (Ipr(2)pz) 5, and X-1 = pyrazole (pz) 6, generally show lower U-eff, while bi-pyrazolate complexes, such as [Dy(tfpz)(2)(THF)(5)][BPh4] 7, [Dy(pz)(2)(THF)(5)][BPh4] 8, [Dy(pz)(2)(py)(5)][BPh4]center dot 2py 9 and [Dy(pz)(2)(NS)(5)][BPh4] 10, show higher U-eff. Among them, 8 shows the largest U-eff of 521(8) K and a comparable open hysteresis temperature of similar to 5 K (at a field sweeping rate of 12 Oe s(-1)) with 9 and 10. The enhanced blocking temperature for 8 is different from that for the PB Dy(iii) SMMs in which the py ligand can cause a much higher hysteresis temperature than the one coordinated with THF due to the aromatic pi-pi interactions, indicating that the bis-bidentate-chelating Dy(iii) ion is rigid enough to reduce the influence from the equatorial ligands. Moreover, substitution with electron-withdrawing groups such as the -CF3 group reduces U-eff prominently. Such a clear magnetostructural correlation in Dy(iii) SMMs is fundamentally important, indicating that a subtle balance between magnetic axiality and molecular rigidity is critical to design high-performance Dy(iii) SMMs.

But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 149809-43-8, you can contact me at any time and look forward to more communication. SDS of cas: 149809-43-8.

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