Tag: M.W=50-100

Asakawa, Tomohiro published the artcilePractical Synthesis of Polymethylated Flavones: Nobiletin and Its Desmethyl Derivatives, Name: N-Methylformamide, the main research area is nobiletin synthesis; flavone polymethoxylated preparation.

We present a practical synthesis of the polymethoxylated citrus flavone nobiletin that is suitable for use on a hundred gram scale. Ready availability of this compound and its derivatives will aid detailed chem.-biol. investigations of their biol. activities, including activation of signaling via the cAMP-dependent protein kinase A/extracellular signal-related protein kinase/cAMP response element-binding protein pathway.

Organic Process Research & Development published new progress about Methoxyflavones Role: SPN (Synthetic Preparation), PREP (Preparation). 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

Ligterink, Niels F. W. published the artcileThe family of amide molecules toward NGC 6334I, Synthetic Route of 123-39-7, the main research area is amide mol chem network star interstellar dust.

Amide mols. produced in space could play a key role in the formation of biomols. on a young planetary object. However, the formation and chem. network of amide mols. in space is not well understood. In this work, Atacama Large Millimeter/submillimeter Array observations are used to study a number of amide(-like) mols. toward the high-mass star-forming region NGC 6334I. The first detections of cyanamide (NH2CN), acetamide (CH3C(O)NH2), and N-methylformamide (CH3NHCHO) are presented for this source. These are combined with analyses of isocyanic acid (HNCO) and formamide (NH2CHO), and a tentative detection of urea (carbamide; NH2C(O)NH2). Abundance correlations show that most amides are likely formed in related reactions occurring in ices on interstellar dust grains in NGC 6334I. However, in an expanded sample of sources, large abundance variations are seen for NH2CN that seem to depend on the source type, which suggests that the phys. conditions within the source heavily influence the production of this species. The rich amide inventory of NGC 6334I strengthens the case that interstellar mols. can contribute to the emergence of biomols. on planets.

Astrophysical Journal published new progress about Amides Role: TEM (Technical or Engineered Material Use), USES (Uses). 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

Wang, Wenran published the artcileProton Initiated Ligand Exchange Reactions for Colloidal Nanocrystals Functionalized by Inorganic Ligands with Extremely Weak Coordination Ability, Category: amides-buliding-blocks, the main research area is inorganic ligand nanocrystal.

Replacing initial long chain organic ligands by small, stable, and conductive inorganic ligands (ILs) via inorganic ligand exchange reaction (ILER) opens up new opportunities for the functionalization and application of colloidal nanocrystals (NCs). Although IL functionalized NCs have been successfully obtained via ILER for most ILs, some common anions, including F-, NO3-, SO42-, and ClO4- with extremely weak coordination ability, are hardly explored. Herein, we demonstrate for the first time the access of these IL capped NCs via ILER by using H+ as the electrophile reagent, which efficiently and irreversibly strips off the original organic ligands first. A long-term colloidal stability can be realized for these anion capped NCs via the replacement of H+ by other suitable monovalent counterions. It is believed that the successful capping with these hard ILs for soft NCs such as CdSe will not only promote the development of IL exchange theory and mechanism but also significantly enrich the toolbox of colloidal NCs and provide great opportunities in the design and construction of new NC-based devices.

Chemistry of Materials published new progress about IR spectra. 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Category: amides-buliding-blocks.

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

Woelders, H. published the artcileFreezing chicken semen: Influence of base medium osmolality, cryoprotectants, cryoprotectant concentration, and cooling rate on post-thaw sperm survival, Computed Properties of 123-39-7, the main research area is freezing chicken sperm survival osmolality cryoprotectant cooling post thawing; CPA; CPA concentration; Chicken semen; Cooling rate; Cryopreservation; Dimethylacetamide; Extender; Freezing medium.

A classical chicken semen diluent (Lake′s 7.1 diluent) was modified to have lowered osmolalities (ranging from 290 to 410 mOsm/kg). The modified medium with physiol. osmolality of 325 mOsm/kg allowed cold storage of fresh semen for several days with very little loss of membrane integrity and motility, while high osmolalities inhibited motility. This modified medium was then used as base for freezing medium to test effects of the type and concentration of cryoprotective agent (CPA), and the cooling rate (CR). A number of CPAs (methylformamide, methylacetamide, DMF (DMF), dimethylacetamide (DMA), diethylformamide, and propylene glycol) were first compared by freezing semen with 0.6 mol/l of the resp. CPA at a cooling rate of 250 °C/min. Post-thaw motility and membrane integrity were highest with DMA and DMF. Finally, in more detailed factorial experiments, semen from individual cocks or pooled semen was frozen using CRs of 4, 50, 250, and 440 °C/min and DMA concentrations ([DMA]) of 0.4, 0.6, 1.0, and 1.5 mol/l. Straws from each semen sample x treatment combination were divided for semen assessment at three different research groups for sperm motility, membrane integrity, kinked tails, and DNA fragmentation, using microscopy, computer assisted motility anal., and flow cytometry. There were clear effects of both CR and [DMA] and their interaction. CRs 50 and 250 °C/min gave best post-thaw sperm performance. Higher DMA concentrations gave better post-thaw membrane integrity, but concentrations above 1.0 mol/l can decrease sperm velocity or even inhibit sperm motility. Therefore [DMA] may best be 0.6-1.0 mol/l at a CR of 50-250 °C/min.

Cryobiology published new progress about Cell survival. 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

Cernicharo, J. published the artcileBroad-band high-resolution rotational spectroscopy for laboratory astrophysics, Application In Synthesis of 123-39-7, the main research area is laboratory astrophysics broad band high resolution rotational spectra; Methods: laboratory: molecular; Molecular processes; Plasmas; line: identification; molecular data.

We present a new exptl. set-up devoted to the study of gas phase mols. and processes using broad-band high spectral resolution rotational spectroscopy. A reactor chamber is equipped with radio receivers similar to those used by radio astronomers to search for mol. emission in space. The whole range of the Q (31.5-50 GHz) and W bands (72-116.5 GHz) is available for rotational spectroscopy observations. The receivers are equipped with 16 × 2.5 GHz fast Fourier transform spectrometers with a spectral resolution of 38.14 kHz allowing the simultaneous observation of the complete Q band and one-third of the W band. The whole W band can be observed in three settings in which the Q band is always observed Species such as CH3CN, OCS, and SO2 are detected, together with many of their isotopologues and vibrationally excited states, in very short observing times. The system permits automatic overnight observations, and integration times as long as 2.4 × 105 s have been reached. The chamber is equipped with a radiofrequency source to produce cold plasmas, and with four UV lamps to study photochem. processes. Plasmas of CH4, N2, CH3CN, NH3, O2, and H2, among other species, have been generated and the mol. products easily identified by the rotational spectrum, and via mass spectrometry and optical spectroscopy. Finally, the rotational spectrum of the lowest energy conformer of CH3CH2NHCHO (N-ethylformamide), a mol. previously characterized in microwave rotational spectroscopy, has been measured up to 116.5 GHz, allowing the accurate determination of its rotational and distortion constants and its search in space.

Astronomy & Astrophysics published new progress about Density Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), PROC (Process). 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

Kumar, Rashmi published the artcileMeasurement of the Proton Affinities of a Series of Mono- and Biradicals of Pyridine, Formula: C2H5NO, the main research area is pyridine monoradical diradical proton affinity.

The proton affinity (PA) of a neutral mol. is defined as the neg. of the enthalpy change for the gas-phase reaction between a proton and the neutral mol. to produce the (charged) conjugate acid of the mol. PA is a fundamental property that is related to the structure of a mol. and affects its reactivity. Very few PA values are available for basic organic monoradicals and none for biradicals. Here, the PA values for several σ-type carbon-centered pyridine-based monoradicals and biradicals have been exptl. determined by monitoring proton transfer from the protonated mono- and biradicals to reference bases with known proton affinities as a function of time in Fourier-transform ion cyclotron resonance (FT-ICR) and linear quadrupole ion trap (LQIT) mass spectrometers. A procedure was developed for both instruments that permits differentiation between exo- and endothermic proton transfer reactions. The PA values of all the (bi)radicals studied were found to be lower than that of pyridine. This is rationalized based on the electron-withdrawing nature of the radical site(s). Thus, the PA values decrease in the order: pyridine > monoradicals > biradicals. The PA values of the monoradicals were also found to increase (making the protonated radicals less acidic) as the distance between the basic nitrogen atom and the radical site increases. Similar behavior was found for the biradicals, with one exception: 3,5-didehydropyridine has a larger PA (215.3 ± 3.3 kcal mol-1) than 3,4-didehydropyridine (PA = 213.4 ± 3.3 kcal mol-1) even though the latter biradical has one radical site farther away from the basic nitrogen atom. Quantum chem. calculations of the PAs of the (bi)radicals are in reasonably good agreement with the exptl. determined values. At the DFT (B3LYP), CCSD(T), and CASPT2 levels of theory, the mean unsigned errors are 2.3, 1.7, and 2.1 kcal mol-1.

Journal of the American Chemical Society published new progress about Collision-induced dissociation. 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

Wingborg, Niklas published the artcileHeat of Formation of ADN-Based Liquid Monopropellants, Safety of N-Methylformamide, the main research area is ammonium dinitramide liquid monopropellant heat formation.

Energetic ionic liquids have obtained substantial attention the last decades as less toxic, or green, monopropellants to replace the carcinogenic and toxic hydrazine. Among the most promising hydrazine substitutes are propellants based on ammonium dinitramide, ADN, dissolved in a fuel/water mixture These types of propellants are single phase mixtures, and thus their heats of formation are influenced by the heats of solution and heats of mixing of the resp. components used. These enthalpy contributions have been measured for three different ADN-based propellants (LMP-103S, FLP-106 and FLP-107) and their specific impulses have been calculated The results show that ADN heat of solution must be considered in order to accurately calculate the specific impulse.

Propellants, Explosives, Pyrotechnics published new progress about Enthalpy Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), PROC (Process). 123-39-7 belongs to class amides-buliding-blocks, name is N-Methylformamide, and the molecular formula is C2H5NO, Safety of N-Methylformamide.

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

Cobos, Ana published the artcileSolid-liquid equilibria and excess enthalpies in binary mixtures of acetophenone with some aliphatic amides, Synthetic Route of 123-39-7, the main research area is acetophenone aliphatic amide solid liquid equilibrium excess enthalpy.

Solid-liquid equilibrium for the binary systems of acetophenone and {N-methylformamide, or N,N-dimethylformamide, or N,N-dimethylacetamide, or N-methyl-2-pyrrolidone} were determined by the cloud-point and DSC techniques. For the same systems, excess enthalpies were measured at 293.15 K and 308.15 K by the titration calorimetry. Both types of data were correlated by the Redlich-Kister equation. The description of the solid-liquid equilibrium incorporated measured excess enthalpies. The results of the prediction performed by the modified UNIFAC model were compared with the exptl. data. The observed trends and differences between systems were discussed.

Journal of Molecular Liquids published new progress about Binary mixtures. 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

Cha, Xingchang published the artcileLiquid-Liquid Equilibrium for Ternary Systems of N-Methylformamide + Pyrrole/Indole + Alkanes at 298.15 K: Phase Equilibrium Measurement and Correlation, Recommanded Product: N-Methylformamide, the main research area is liquid liquid equilibrium ternary system methylformamide pyrrole indole alkane.

For the purpose of separating nitrogen compounds, pyrrole and indole, N-methylformamide (NMF) was selected as the extractive solvent. The liquid-liquid equilibrium (LLE) data for {NMF + pyrrole/indole + alkanes} systems were measured at 298.15 K under atm. pressure of 101.3 kPa. The triangular diagrams of the above eight systems, {NMF + pyrrole/indole + n-hexane/n-heptane/n-decane/n-dodecane}, were classified as Treybal’s type I. Meanwhile, the nonrandom two-liquid (NRTL) and universal quasi-chem. (UNIQUAC) activity coefficient models were applied to correlate the LLE data, and the UNIQUAC model shows better agreement than the NRTL model. In addition, the distribution constant and selectivity factor were calculated on the basis of the exptl. data and utilized to investigate the extraction capabilities of NMF for pyrrole and indole.

Journal of Chemical & Engineering Data published new progress about Extractants. 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

Ostroushko, A. A. published the artcileInteraction of Low-Molecular Compounds with Nanoclusters: Thermodynamics, Relationship with Dielectric Permittivity and Polarizability of Molecules, Magic Numbers, Research Prospects, Safety of N-Methylformamide, the main research area is low mol compound nanocluster thermodn dielec permittivity; polarizability mol magic number research prospect.

The enthalpies of interactions of various organic compounds with nanocluster molybdenum-containing polyoxometalates have been studied exptl. Substances with dielec. permittivity varying within a wide range were chosen. The dependence of enthalpy was found to be sign-variable, with a transition from endothermal to exothermal effects in the range of permittivity 15-17. Similar tendencies with an extremum or inflection at permittivity of 15-17 were found for a number of reference physicochem. parameters (boiling and m.ps., enthalpies of these processes, enthalpy of formation, viscosity, heat capacity) of a wide range of organic and some inorganic compounds The general nature of these tendencies may be a basis for further development of modern concepts about the mechanisms of intermol. interaction.

Russian Journal of Physical Chemistry A 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, Safety of N-Methylformamide.

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