Category: amides-buliding-blocks

Chopra, Geetanjali published the artcileElucidating the intermolecular hydrogen bonding interaction of proline with amides-quantum chemical calculations, Computed Properties of 123-39-7, the main research area is proline formamide hydrogen bond complex electrostatic potential stabilization energy.

The hydrogen-bonded complexes formed between proline and amides have been investigated completely by the use of computational methods such as Atoms In Mols. (AIM), Natural Bond Orbitals (NBO), and Mol. Electrostatic Surface Potential (MESP). All computations are based on structural models previously generated at wB97XD/aug-cc-pVDZ level. The amide mol. interacts with proline, in a pair of amideC=O···H-OPro and amideN-H···O=CPro hydrogen bonds (HBs), forming eight-membered ring structure in the most stable complexes. The substitution of N-Me in formamide strengthens the amideC=O···H-X (X = O, N of proline) HBs, whereas weakens the amideN-H···O/NPro and amideC-H···O/NPro HB interactions. The tendency of N-H of amide to act as HB donor is found to be far better than the N-H of amino group of proline. On the basis of vibrational frequency calculations, the red and blue shifting of proton donor fragment X-H (X = O, N, C) has also been analyzed.

Structural Chemistry published new progress about Atomic charge. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Computed Properties of 123-39-7.

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

Ochmann, Miguel published the artcileR-Group stabilization in methylated formamides observed by resonant inelastic X-ray scattering, Application of N-Methylformamide, the main research area is formaide inelastic Xray scattering stabilization energy transfer.

The inherent stability of methylated formamides is traced to a stabilization of the deep-lying σ-framework by resonant inelastic X-ray scattering at the nitrogen K-edge. Charge transfer from the amide nitrogen to the Me groups underlie this stabilization mechanism that leaves the aldehyde group essentially unaltered and explains the stability of secondary and tertiary amides.

Chemical Communications (Cambridge, United Kingdom) published new progress about Atomic charge. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Application of N-Methylformamide.

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

Wang, Yi-Gui published the artcileThe Reactivity of Ambident Nucleophiles: Marcus Theory or Hard and Soft Acids and Bases Principle?, Product Details of C2H5NO, the main research area is alkyl halide ambident nucleophile reactivity electron delocalization charge hardness; Marcus theory; ambident reactivity; atom and molecule hardness; conceptual DFT; delocalization index; electron affinity; hard and soft acids and bases (HSAB) principle; ionization potential; localization index; maximum hardness principle (MHP).

The model reactions CH3X + (NH-CH=O)M → CH3-NH-NH=O or NH=CH-O-CH3 + MX (M = none, Li, Na, K, Ag, Cu; X = F, Cl, Br) are investigated to demonstrate the feasibility of Marcus theory and the hard and soft acids and bases (HSAB) principle in predicting the reactivity of ambident nucleophiles. The delocalization indexes (DI) are defined in the framework of the quantum theory of atoms in mols. (QT-AIM), and are used as the scale of softness in the HSAB principle. To react with the ambident nucleophile NH=CH-O-, the carbocation H3C+ from CH3X (F, Cl, Br) is actually a borderline acid according to the DI values of the forming C···N and C···O bonds in the transition states (between 0.25 and 0.49), while the counter ions are divided into three groups according to the DI values of weak interactions involving M (M···X, M···N, and M···O): group I (M = none, and Me4N) basically show zero DI values; group II species (M = Li, Na, and K) have noticeable DI values but the magnitudes are usually less than 0.15; and group III species (M = Ag and Cu(I)) have significant DI values (0.30-0.61). On a relative basis, H3C+ is a soft acid with respect to group I and group II counter ions, and a hard acid with respect to group III counter ions. Therefore, N-regioselectivity is found in the presence of group I and group II counter ions (M = Me4N, Li, Na, K), while O-regioselectivity is observed in the presence of the group III counter ions (M = Ag, and Cu(I)). The hardness of atoms, groups, and mols. is also calculated with new functions that depend on ionization potential (I) and electron affinity (A) and use the at. charges obtained from localization indexes (LI), so that the regioselectivity is explained by the at. hardness of reactive nitrogen atoms in the transition states according to the maximum hardness principle (MHP). The exact Marcus equation is derived from the simple harmonic potential energy parabola, so that the concepts of activation free energy, intrinsic activation barrier, and reaction energy are completely connected. The required intrinsic activation barriers can be either estimated from ab initio calculations on reactant, transition state, and product of the model reactions, or calculated from identity reactions. The counter ions stabilize the reactant through bridging N- and O-site of reactant of identity reactions, so that the intrinsic barriers for the salts are higher than those for free ambident anions, which is explained by the increased reorganization parameter Δr. The proper application of Marcus theory should quant. consider all three terms of Marcus equation, and reliably represent the results with potential energy parabolas for reactants and all products. For the model reactions, both Marcus theory and HSAB principle/MHP principle predict the N-regioselectivity when M = none, Me4N, Li, Na, K, and the O-regioselectivity when M = Ag and Cu(I).

Journal of Computational Chemistry published new progress about Atomic charge. 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

Carmona-Espindola, Javier published the artcileConstrained dipole moment density functional theory for charge distributions in force fields for the study of molecular fluids, Computed Properties of 123-39-7, the main research area is constrained dipole moment DFT charge distribution force field fluid; MD MM simulation constrained dipole moment DFT mol fluid.

A new procedure, based on electronic structure calculations that only requires a dipole moment value for a given mol. as input and, from which the charges for all the atoms in it are uniquely determined, is developed and applied to the study of mol. fluids with classical dynamics. The dipole moment value considered for the isolated mol. is the one that reproduces the dielec. constant of its corresponding fluid. Following previous work, the Lennard-Jones parameters are determined to reproduce the liquid d. and the surface tension at the liquid-vapor interface. The force field thus obtained leads to a reasonable description of several properties such as heats of vaporization, self-diffusion coefficients, shear viscosities, isothermal compressibilities, and volumetric expansion coefficients of pure substances. (c) 2020 American Institute of Physics.

Journal of Chemical Physics published new progress about Atomic charge. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Computed Properties of 123-39-7.

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

Kunwar, Deepak published the artcileEffects of solvents on synthesis of piezoelectric polyvinylidene fluoride trifluoroethylene thin films, Application of N-Methylformamide, the main research area is solvent effect piezoelec PVDF TrFE thin film dissolution.

Polyvinylidene Fluoride (PVDF) and its co-polymer formulations, such as tri-fluoroethylene (TrFE) have been extensively researched as a thin flexible piezoelec. material for a wide range of applications, and new methods of synthesizing the material are continuously being investigated. Researchers have used various solvents to synthesize the PVDF film, yet the effects of these solvents on the piezoelec. properties have not been systematically investigated. The selection of an optimized solvent for polymer dissolution can affect film properties, which could lead to enhanced device performance for piezoelec.-based microsystems. Herein, several solvents were screened for the dissolution of PVDF-TrFE polymer to investigate the effect of solvents and to determine key properties of the solvents that influence the piezoelec. response, so further enhancements can be made in the future. This study investigated 14 different solvents with varying physicochem. properties. The thin films were characterized via X-ray diffraction and quasi-static piezometer measurements. This paper reports that the piezoelec. coefficient of the thin film was highly dependent on the solvent′s dipole moment. Our observation revealed that the solvent with the highest dipole moment that was able to completely dissolve the PVDF-TrFE powder produced the film with the highest piezoelec. coefficient The spin coated film decreased thickness with increasing spin speed, and the piezoelec. coefficient was not affected by the thickness of the film in the range of 1-5 μm.

Thin Solid Films published new progress about Boiling point. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Application of N-Methylformamide.

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

Jersovs, Glebs published the artcileSynthetic Approach toward Enantiopure Cyclic Sulfinamides, Recommanded Product: (S)-2-Methylpropane-2-sulfinamide, the main research area is sulfinamide haloalkenyl diastereoselective cyclization tert butyl cleavage; cyclic sulfinamide asym synthesis oxidation alkylation.

A synthetic approach toward densely substituted enantiopure cyclic sulfinamides possessing up to four consecutive stereogenic centers has been developed based on a completely diastereoselective SN2′ cyclization/tert-Bu cleavage sequence. Diastereospecific transformation of the obtained scaffold into chiral SVI derivatives such as sulfoximines and sulfonimidamides is demonstrated.

Organic Letters published new progress about Bond cleavage. 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

Wu, Ling-Nan published the artcileExperimental and kinetic study on the low-temperature oxidation of pyridine as a representative of fuel-N compounds, Formula: C2H5NO, the main research area is pyridine oxidation temperature kinetics.

The low-temperature oxidation (LTO) of pyridine was studied in a jet-stirred reactor over the temperature range of 700-1000 K at atm. pressure and equivalence ratio of 2.0. Mole fraction profiles of the reaction products were obtained based on mol. beam mass spectrometry and tunable vacuum UV synchrotron photoionization techniques. Hydrogen peroxide, methanamine, acetylenamine, ethenamine, acetaldimine, ethylamine, allyamine, and methylformamide were newly identified compared with previous studies of pyridine flame and pyrolysis. HCN was found to be the dominant N-containing species of pyridine LTO. Pyrrole, acrylonitrile, acetonitrile, and ammonia were also found at the same level of N2O and NO. Based on the new measurements and updated rate constants of several reactions including the H-abstractions of pyridine as well as the oxidation of ortho-pyridyl using d. functional theory calculations, a new pyridine LTO kinetic model consisting of 588 species and 3516 reactions was developed with a reasonable agreement with the exptl. results. In general, the predictions of the predominant species have been improved compared with the existing model. Rate-of-production anal. indicates that pyridine mainly consumes via C5H5N→C5H4N→C5H4NO2→HCN+CO+CH2CHC→O, and C5H5N→C5H5NO→C2H2+HCN+CH2CO. Sensitivity anal. shows that C5H4N+O2 = >C5H4NO2, and C5H5N+OH=C5H4N+H2O have significant promoting effect on pyridine consumption, while the reverse of C5H4N+HO2=C5H4NO+OH has strong inhibiting effect. The results will enrich the understanding of pyridine low-temperature oxidation mechanism, which can be applied to the fields of coal pre-treatment, staged combustion and mild combustion.

Combustion and Flame published new progress about Carbonization. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Formula: C2H5NO.

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

Jacobs, Jeffrey W. published the artcileDiscovery of Tenapanor: A First-in-Class Minimally Systemic Inhibitor of Intestinal Na+/H+ Exchanger Isoform 3, SDS of cas: 35203-88-4, the main research area is tenapanor inhibitor intestine sodium hydrogen exchanger isoform 3 NHE3.

We present herein the design, synthesis, and optimization of gut-restricted inhibitors of Na+/H+ exchanger isoform 3 (NHE3). NHE3 is predominantly expressed in the kidney and gastrointestinal tract where it acts as the major absorptive sodium transporter. We desired minimally systemic agents that would block sodium absorption in the gastrointestinal tract but avoid exposure in the kidney. Starting with a relatively low-potency highly bioavailable hit compound (1), potent and minimally absorbed NHE3 inhibitors were designed, culminating with the discovery of tenapanor (28). Tenapanor has been approved by the U.S. Food and Drug Administration (FDA) for the treatment of irritable bowel syndrome with constipation in adults.

ACS Medicinal Chemistry Letters published new progress about Digestive tract. 35203-88-4 belongs to class amides-buliding-blocks, name is 3-Acetylbenzenesulfonamide, and the molecular formula is C8H9NO3S, SDS of cas: 35203-88-4.

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

Hayat, Waseem published the artcileInsight into the degradation of methomyl in water by peroxymonosulfate, Application In Synthesis of 123-39-7, the main research area is methomyl peroxymonosulfate oxidative wastewater treatment.

Methomyl (MET) is a carbamate pesticide frequently used in agriculture, globally. Its high solubility makes it a potential water pollutant. MET can be removed by peroxymonosulfate (PMS)-based advanced oxidation processes. This study explains MET degradation by PMS-Only, pyrite (PyR)-PMS and zero-valent iron (ZVI)-PMS systems. The degradation by PMS-Only, PyR-PMS and ZVI-PMS systems was 85.4%, 94.9% and 87.0%, resp. The generation of reactive oxygen species (ROS) and their role in degradation was elucidated by ESR (EPR) and free-radical quenching analyses, resp. EPR anal. indicated the presence of sulfate (SO•-4) and hydroxyl (•OH) radicals. The degradation in PMS-Only and ZVI-PMS systems was not significantly inhibited by tert-Bu alc. (TBA) and methanol (MeOH), which suggests that the degradation in both systems was not majorly carried out by SO•-4 and •OH. However, furfuryl acid (FFA) resulted in reduced degradation by applied systems, which showed that singlet oxygen (1O2) was mainly responsible for degradation in all systems. These results showed that MET was majorly degraded by non-radical PMS oxidation PMS-Only system resulted in an almost equal degradation, compared with PyR-PMS and ZVI-PMS systems. So, detailed anal. was carried out for PMS-Only system. Hence, experiments were conducted to investigate the effect of PMS concentration, MET concentration, pH and temperature on the degradation by PMS-Only system, which showed that PMS-Only system was efficient from pH 5.0 to pH 9.0, and from 10.0 °C to 40.0 °C. Further, PMS-Only system has a potential for effective degradation in real waters because it resulted in 66.5%, 63.7% and 60.4% degradation in tap water, lake water and sewage water, resp.

Journal of Environmental Chemical Engineering published new progress about Drinking waters. 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

Lu, Nan published the artcileNon-aqueous electrophoresis integrated with electrospray ionization mass spectrometry on a thiol-ene polymer-based microchip device, Synthetic Route of 123-39-7, the main research area is electrophoresis integrated electrospray ionization mass spectrometry thiol ene polymer; microchip device; Electrospray interface; Microfluidics; Non-aqueous electrophoresis; Thiol-ene polymers.

Abstract: Non-aqueous capillary electrophoresis (NACE) on microfluidic chips is still a comparatively little explored area, despite the inherent advantages of this technique and its application potential for, in particular, lipophilic compounds A main reason is probably the fact that implementation of NACE on microchips largely precluded the use of polymeric substrate materials. Here, we report non-aqueous electrophoresis on a thiol-ene-based microfluidic chip coupled to mass spectrometry via an on-chip ESI interface. Microchips with an integrated ESI emitter were fabricated using a double-molding approach. The durability of thiol-ene, when exposed to different organic solvents, was investigated with respect to swelling and decomposition of the polymer. Thiol-ene exhibited good stability against organic solvents such as methanol, ethanol, N-methylformamide, and formamide, which allows for a wide range of background electrolyte compositions The integrated ESI emitter provided a stable spray with RSD% of the ESI signal ≤8%. Separation efficiency of the developed microchip electrophoresis system in different non-aqueous buffer solutions was tested with a mixture of several drugs of abuse. Ethanol- and methanol-based buffers provided comparable high theor. plate numbers (≈ 6.6 x 104-1.6 x 105 m-1) with ethanol exhibiting the best separation efficiency. Direct coupling of non-aqueous electrophoresis to mass spectrometry allowed for fast anal. of hydrophobic compounds in the range of 0.1-5μg mL-1 and 0.2-10μg mL-1 and very good sensitivities (LOD ≈ 0.06-0.28μg mL-1; LOQ ≈ 0.20-0.90μg mL-1). The novel combination of non-aqueous CE on a microfluidic thiol-ene device and ESI-MS provides a mass-producible and highly versatile system for the anal. of, in particular, lipophilic compounds in a wide range of organic solvents. This offers promising potential for future applications in forensic, clin., and environmental anal.

Analytical and Bioanalytical Chemistry published new progress about Electrophoresis. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Synthetic Route of 123-39-7.

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