Category: amides-buliding-blocks

Wu, Tsung-Tse published the artcileMeasurements of the dissociation conditions for methane hydrates with various additives of 1,2-epoxybutane, 2,3-dihydrofuran, N-methylformamide, 4-methylmorpholine, or 1-(2-furyl)methylamine, HPLC of Formula: 123-39-7, the main research area is methane hydrate sodium chloride phase equilibrium.

The exptl. phase equilibrium measurements for the dissociation conditions of methane hydrates in the presence of five additives are reported in this study. The isochoric method was employed to measure the three-phase (hydrate + liquid water + vapor, H-Lw-V) dissociation conditions (the three-phase equilibrium temperatures and pressures) under various concentrations of five additive compounds These additives include 1,2-epoxybutane that showed a promotion effect up to 2.6 K at a fixed pressure for the formation of methane hydrate. Other additives of 2,3-dihydrofuran N-methylformamide, 4-methylmorpholine and 1-(2-furyl)methylamine, however, all showed the inhibition effect from 1.3 up to 9 K. The possible structures of methane hydrates with these additives were estimated from the Clausius-Clapeyron equation by using the measured equilibrium temperature and pressure data. It is shown that with the additive of 1,2-epoxybutane, a sII hydrate structure might cause the promotion effect. The other four additives with inhibition effect all showed the possible sI structure. This study reports novel phase equilibrium data and verifies a useful screening method to select the available additives for natural gas production or transportation.

Fluid Phase Equilibria published new progress about Enthalpy. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, HPLC of Formula: 123-39-7.

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

Zhou, Li published the artcileSelective Synthesis of Single-Handed Helical Polymers from Achiral Monomer and a Mechanism Study on Helix-Sense-Selective Polymerization, Recommanded Product: (S)-2-Methylpropane-2-sulfinamide, the main research area is helicity conformation single handed polyphenyl isocyanide preparation; chiral polymers; helix; helix-sense-selective polymerization; living polymerization; polymers.

Inspired by the exquisite helixes in nature, fabrication of helical materials with controlled handedness has attracted considerable attention. Herein, the authors report on precise synthesis of single left- and right-handed helical polyisocyanides through living polymerization of achiral monomers using chiral palladium catalysts under helix-sense-selective manner. Mechanism study revealed that the yielded helixes with opposite handedness showed different activity of the living chain end. The helix with unfavored handedness was self-terminated, while the one with favored handedness showed high activity and could undergo chain propagation to form a high mol. weight polymer with maintained single-handed helicity.

Angewandte Chemie, International Edition published new progress about Helicity. 343338-28-3 belongs to class amides-buliding-blocks, name is (S)-2-Methylpropane-2-sulfinamide, and the molecular formula is C4H11NOS, Recommanded Product: (S)-2-Methylpropane-2-sulfinamide.

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

Schaad, David R. published the artcileActivation of amide nitrogen-hydrogen bonds by iron and ruthenium phosphine complexes, Synthetic Route of 359-38-6, the main research area is amide activation iron ruthenium complex; nitrogen hydrogen bond activation amide; hydride ruthenium iron activation amide.

The complexes cis-RuHR(dmpe)2 (R = naphthyl, dmpe = Me2PCH2CH2PMe2), cis-FeH2(dmpe)2, and FeH(C6H4PPhCH2CH2PPh2)(DPPE) readily activate the N-H bonds of amides, yielding trans-MH(NHCOR1)L2 (R1 = COCF3, COC6F5, COMe, etc., L = diphosphine) products. The formation and stability of the product depend on the natures of both the metal complex and the amide employed. For the more acidic amides (e.g., trifluoroacetamide and triflamide), product formation appears to proceed via protonation of the metal complex by the amide. In the presence of excess amide, trans-RuH(NHCOR)(dmpe)2 undergoes rapid exchange of the amido ligand but not the hydride ligand.

Journal of the American Chemical Society published new progress about H-N bond. 359-38-6 belongs to class amides-buliding-blocks, name is 2,2-Difluoroacetamide, and the molecular formula is C2H3F2NO, Synthetic Route of 359-38-6.

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

Anggo Krisbiantoro, Philip published the artcileCatalytic glycolysis of polyethylene terephthalate (PET) by solvent-free mechanochemically synthesized MFe2O4 (M = Co, Ni, Cu and Zn) spinel, Name: N-Methylformamide, the main research area is catalytic glycolysis polyethylene terephthalate spinel catalyst.

In the present study, the solvent-free mechanochem. synthesized MFe2O4 (M = Co, Ni, Cu, and Zn) spinel was used as a catalyst for PET glycolysis. All catalysts were active for PET glycolysis to produce bis(2-hydroxyethyl) terephthalate (BHET) with the order of PET conversion of ZnFe2O4 > CuFe2O4 > CoFe2O4 > NiFe2O4. The catalytic activity was correlated with the Lewis acid strength of the M2+ in MFe2O4, i.e., a catalyst with strong Lewis acid exhibited high catalytic activity. Although CoFe2O4 was the second-best catalyst among the four in terms of yield of BHET, it possessed the highest saturation magnetization, which is a great advantage for magnetic separation of the catalyst. The reaction over CoFe2O4 exhibited apparent activation energy (Ea) of 188 kJ mol-1, and it was reusable for at least five times. Moreover, a simulation using Aspen Plus software showed that scale-up is highly feasible.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Acidity. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Name: N-Methylformamide.

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

Spange, Stefan published the artcileReappraisal of Empirical Solvent Polarity Scales for Organic Solvents, Product Details of C2H5NO, the main research area is organic solvent empirical polarity.

Correlations of Reichardt ‘s ET(30), the Catalan SdP (solvent dipolarity), SP (solvent polarizability), SA (solvent acidity), SB (solvent basicity), Kamlet-Taft π* (dipolarity/polarizability), α (hydrogen bond donating ability) and β (hydrogen bond accepting ability) polarity parameters with the molar concentration of 161 pure organic solvents are presented. Mostly, linear relationships of the polarity parameter as a function of molar concentration are obtained as long as each individual solvent class is considered sep. A phys. different interpretation of the ET(30), Kamlet-Taft π* and α as well as Catalan SA and SB parameters has been proposed. Furthermore, the Hildebrand solubility parameter in combination with the diffraction index is used for the correlation anal. with the above-mentioned solvent parameters. It can be concluded that empirical polarity parameters derived from solvatochromic UV/Vis measurements are inherently a function of the mol. structure of the probe.

Chemistry: Methods published new progress about Acidity. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Product Details of C2H5NO.

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

Du, Ming-Xuan published the artcileHydrogen-Bonding Interactions in Polymer-Organic Solvent Mixtures, SDS of cas: 123-39-7, the main research area is hydrogen bonding polymer organic solvent.

Polymer solubility in organic solvents generally is predicted by the Hildebrand solubility parameter (δ) approach based on the “”like dissolves like”” principle. A conspicuous exception is that there exist many soluble pairs that the solubility parameter approach predicts to be insoluble due to the large δ difference between the pair. These cases were attributed to specific attractive interactions (e.g., hydrogen bonding) between the solute and solvent that lead to a neg. enthalpy of mixing to promote the solubility Recently, we find that the polymer solubility in ionic liquids is dominated by hydrogen-bonding interactions (Phys. Chem. Phys.2021,23, 21893-21900). More importantly, three principles based on the Kamlet-Abraham-Taft multiple-polarity scale for dealing with hydrogen-bonding interactions were proposed. Two parameters (α is the hydrogen-bond acidity parameter, and β is the basicity parameter) are required to describe hydrogen-bonding complementarity. The product of ΔαΔβ, where Δ is the difference in parameters between the polymer and solvent, is an indicator of the competition between cross-association and self-association hydrogen bonding. Therefore, an excess interaction parameter χHB, which is proportional to ΔαΔβ, can be introduced to account for the solubility promotion. In this study, these principles were used to test the solubility of polymer/organic solvent mixtures, for which the solubility parameter approach fails. These polymer/organic solvent pairs that consist of 12 polymers and 27 organic small mols. have discrepant solubility parameters (>5 MPa1/2 at least). A good correlation between the solubility data and the solubility criterion (ΔαΔβ < 0) reveals that hydrogen-bonding interactions are responsible for the solubility Therefore, the excess interaction parameter, χHB (~ΔαΔβ), provides a significant correction in the Flory-Huggins theory. This finding can also serve as a prescreening tool for the solubility of polar polymers besides the ""like dissolves like"" principle. Macromolecules (Washington, DC, United States) published new progress about Acidity. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, SDS of cas: 123-39-7.

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

Altomare, Cosimo published the artcileDetermination of lipophilicity and hydrogen-bond donor acidity of bioactive sulfonyl-containing compounds by reversed-phase HPLC and centrifugal partition chromatography and their application to structure-activity relations, Safety of 3-Acetylbenzenesulfonamide, the main research area is lipophilicity hydrogen acidity benzenesulfonamide aminodiphenylsulfone QSAR; structure lipophilicity hydrogen acidity benzenesulfonamide aminodiphenylsulfone.

The lipophilic character of two large series of substituted benzenesulfonamides (BzSA)and 4-aminodiphenylsulfones (4-ADS) has been assessed by two chromatog. methods, i.e. reversed-phase HPLC using a relatively novel octadecylpolyvinyl packing and centrifugal counter-current chromatog. (CPC). The octadecylpolyvinyl stationary phase proved an interesting alternative to the more common octadecylsilane type stationary phase for obtaining retention parameters correlated to partition coefficients (i.e. log P). The CPC method, being far less time-consuming and markedly more precise than the classical shake-flask method, offers a promising alternative to measuring partition coefficients The parameter Δlog Poct-hep, i.e. log Poctanol minus log Pheptane, was also examined for both congeneric series and was indicative of a similar H-bonding capacity for the SO2NH2 and 4-NH2-C6H4-SO2 groups. QSAR analyses of carbonic anhydrase inhibition by BzSA and antimycobacterial activity of 4-ADS show the capacity of the new lipophilicity parameters to express the hydrophobic component of the drug-enzyme interactions and to reveal a possible role of H-bond donor capacity in governing the antimycobacterial activity of 4-ADS.

Journal of Pharmacy and Pharmacology published new progress about Acidity. 35203-88-4 belongs to class amides-buliding-blocks, name is 3-Acetylbenzenesulfonamide, and the molecular formula is C8H9NO3S, Safety of 3-Acetylbenzenesulfonamide.

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

Mangstl, Martin published the artcileSynthesis and characterization of methylammonium phosphates as crystalline approximants for anhydrous, low melting phosphate glasses, HPLC of Formula: 123-39-7, the main research area is methylammonium phosphate glass crystalline approximant.

Low-melting methylammonium phosphate glasses are synthesized from crystalline starting agents. To this end crystalline tris(methylammonium) cyclotriphosphate [CH3NH3]3P3O9, was synthesized by a novel and simple synthesis route from P4O10 and N-methylformamide. It, undergoes an irreversible phase transition to methylammonium catena-polyphosphate [CH3NH3]PO3. The crystal structure of the catena-polyphosphate was solved and refined from X-ray powder diffraction data by the Rietveld method using constraints obtained by solid-state 31P and 1H NMR spectroscopy. This compound crystallizes in a triclinic space group with a = 13.2236(9), b = 7.8924(6), c = 4.6553(2) Å α = 91.068(4), β = 87.840(5) and γ = 106.550(3)°. Quantum chem. calculations confirm that the obtained structure lies at an energetic min. Finally the reaction of tris(methylammonium) cyclotriphosphate and P4O10 into methylammonium phosphate glass is presented. The synthesized, water-free phosphate glass shows a very low glass transition temperature Tg of 33°C, which was verified by dynamic scanning calorimetry and NMR. The chain-like crystal structure of the high-temperature methylammoniumphosphate [CH3NH3]PO3 serves as an approximation for the short-range order of the glass.

RSC Advances published new progress about Cooling. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, HPLC of Formula: 123-39-7.

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

Qiu, Dan published the artcileSolubility, density and refractive index of formamide/N-methylformamide/N, N-dimethylformamide + Rb2SO4 + H2O ternary systems at 283.2, 298.2 and 313.2 K, Recommanded Product: N-Methylformamide, the main research area is methylformamide sulfuric acid rubidium water ternary system.

In this work, the solid-liquid equilibrium (SLE) of the ternary systems formamide (FA)/N-methylformamide (NMF)/N, N-dimethylformamide (DMF) + Rb2SO4 + H2O was measured at temperatures of 283.2, 298.2, and 313.2 K. The isothermal solubility of Rb2SO4 in mixed solvents, the d. and refractive index of the saturated solutions were determined At a given temperature, with the increase of the amide content in the mixed solvent, the saturated solubility of Rb2SO4 decreased significantly. The d. trend was consistent with the solubility However, the refractive index increased with increasing the content of amide. The solubility increased with increasing the temperature, whereas, the d. curves and refractive index curves at the three temperatures showed a point of intersection. In addition, the influence of the polarity and structure of amide on the solubility of the ternary system was also discussed. Finally, the exptl. data were fitted with empirical equations.

Journal of Chemical Thermodynamics published new progress about Density. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Recommanded Product: N-Methylformamide.

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

Pande, Vikram published the artcileDescriptors for Electrolyte-Renormalized Oxidative Stability of Solvents in Lithium-Ion Batteries, Application In Synthesis of 123-39-7, the main research area is HOMO solvent electrolyte density functional theory renormalization oxidative stability.

Electrolyte stability against oxidation is one of the important factors limiting the development of high energy d. batteries. The HOMO (HOMO) level of solvent mols. has been traditionally used for understanding trends in their oxidative stability, but this assumes a noninteracting environment. However, solvent HOMO levels are renormalized because of mols. in their solvation shells. In this work, we first demonstrate an inexpensive and accurate method to determine the HOMO level of the solvent followed by simple descriptors for renormalization of the HOMO level due to different electrolyte components. The descriptors are based on Gutmann donor and acceptor numbers of the solvent and other components. The method uses fast generalized gradient approximation-level d. functional theory calculations compared to previously used expensive, exptl. data-dependent methods. This method can be used to screen for unexplored stable solvents among the large number of known organic compounds to design novel high-voltage stable electrolytes.

Journal of Physical Chemistry Letters published new progress about Anions. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Application In Synthesis of 123-39-7.

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