Thematische Bibliographien / Amide-water mixed solvents

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Auswahl der wissenschaftlichen Literatur zum Thema „Amide-water mixed solvents“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Amide-water mixed solvents"

García, Begoña, Rafael Alcalde, José M. Leal und José S. Matos. „Solute−Solvent Interactions in Amide−Water Mixed Solvents“. Journal of Physical Chemistry B 101, Nr. 40 (Oktober 1997): 7991–97. http://dx.doi.org/10.1021/jp9626374.

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Jafarpour, Ali Mohammad, Farivar Fazelpour und Seyyed Abbas Mousavi. „Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system“. International Journal of Energy and Environmental Engineering 11, Nr. 1 (02.12.2019): 55–71. http://dx.doi.org/10.1007/s40095-019-00324-1.

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AbstractIn this study an experimental design was developed to optimize the performance and structure of a membrane-based parallel-plate liquid desiccant dehumidifier used in air conditioning regeneration system which operates under high humidity weather conditions. We conducted a series of polymeric porous membranes with different compositions fabricated that were prepared with various weight percentages of polysulfone (PSU), mixed with N-methyl-2-pyrrolidone (NMP) and dimethyl form amide (DMF) solvents. Furthermore, the designed experiments were performed under various operating conditions, indicating that the dehumidification efficiency declines with increasing flow rate, temperature, and humidity. Consequently, a membrane with optimized porosity and moisture permeability was selected which resulted in eliminating the carryover of solution droplets in the air, largely due to separating the flow condition of liquid desiccant (Li Cl) and air. This specific design is also greatly benefited by removing the water vapor from the air stream. The results of mathematical model simulations indicate that the DMF solvent had higher dehumidification capability compared with that of NMP under the optimized operating conditions. Additionally, it can clarify the porosity of the membrane which plays a significant role in the overall performance. Therefore, the fabricated membrane produces fresh cool air, and it can be applied as a guiding sample for designing the membrane-based dehumidifier with improved performance.

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Zeller, Matthias, Gabriel Lima Barros de Araujo, Trev Parker, Amrinder Singh Rai und Stephen R. Byrn. „A new solvate of afatinib, a specific inhibitor of the ErbB family of tyrosine kinases“. Acta Crystallographica Section E Crystallographic Communications 73, Nr. 3 (21.02.2017): 417–22. http://dx.doi.org/10.1107/s2056989017002626.

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Afatinib (systematic name:N-{4-(3-chloro-4-fluoroanilino)-7-[(tetrahydrofuran-3-yl)oxy]quinazolin-6-yl}-4-(dimethylamino)but-2-enamide), is a specific inhibitor of the ErbB family of tyrosine kinases. The free base form crystallizes from acetonitrile as a mixed water–acetonitrile solvent, C24H25ClFN5O3·0.25C2H3N·2H2O. It crystallizes with two independent molecules (AandB) in the asymmetric unit of the chiral space groupP4212, but exhibits close to perfect pseudo-inversion symmetry, emulatingP4/nccthat relates the two molecules to each other. Exact inversion symmetry is however broken by swapping of oxygen and CH2moieties of the outer tetrahydrofuranyl substituents of the two independent molecules. This can, in turn, be traced back to C—H...N and C—H...O interactions of the acetonitrile solvent molecules with the tetrahydrofuran oxygen and CH2units. In the crystal, neighboring molecules are connectedviaN—H...O hydrogen bonds between the secondary amine and the amide keto O atom. Additional hydrogen bonds are formed through the water solvent molecules, which are engaged in O—H...O and O—H...N hydrogen bonds connecting to the dimethylamino N atom, the amide keto O atom, and one of the quinazoline N atoms of a neighboring molecule, leading to an intricate three-dimensional hydrogen-bonded superstructure. There are two types of channels stretching along the direction of thecaxis; one along the fourfold rotational axis, occupied by acetonitrile solvent molecules situated on that axis, and parallel channels which are not occupied by any solvent.

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Brooks, K. E., und N. B. Smith. „Versatile, efficient system for extracting drugs from urine for gas chromatographic/mass spectrometric analysis.“ Clinical Chemistry 35, Nr. 10 (01.10.1989): 2100–2103. http://dx.doi.org/10.1093/clinchem/35.10.2100.

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Abstract This is a method for efficiently extracting a wide variety of drugs from urine for toxicological analysis by gas chromatography/mass spectrometry. Before extraction, the urine sample is acetylated, diluted with an equal volume of water, and saturated with NaCl. This solution is then mixed with an equal volume of dichloromethane/acetone (2:1 by vol). The organic (top) phase is aspirated and evaporated, and the residue is redissolved in a suitable solvent for injection or further derivatization. This procedure is suitable for all drugs except carboxylate-containing drugs, which may be isolated by replacing the acetylation step with acidification of the urine to pH 2. Studies with 16 drugs containing amino, amide, alcoholic hydroxyl, phenolic hydroxyl, carboxylate groups, or combinations thereof, showed that all drugs except theophylline and benzoylecgonine were extracted with analytical recoveries ranging from 70% to 100%.

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Ji, Huimin, Chunlin Xie, Tingqing Wu, Hao Wang, Zhiwen Cai, Qi Zhang, Wenbin Li, liang Fu, Huanhuan Li und Hai-Yan Wang. „High-entropy solvent design enabling universal electrolyte with a low freezing point for low-temperature aqueous batteries“. Chemical Communications, 2023. http://dx.doi.org/10.1039/d3cc02214e.

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The amide additives acting as hydrogen-bonding ligands effectively break the cross-linking structures between water molecules and increase the entropy of mixed solvents, thus enabling the mixed solvent with an ultralow...

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Zhang, Hao, Feng Xiao und Yanhui Wu. „Fluorinated Metal–Organic Framework–Polymer Mixed Matrix Membrane with Tunable Hydrophobic Channel for Efficient Pervaporation of Butanol/Water“. Small Structures, 20.12.2023. http://dx.doi.org/10.1002/sstr.202300333.

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The permeability–selectivity trade‐off of membrane is a major challenge limiting the development of pervaporation (PV) technology. Rational design of high‐performance mixed matrix membranes (MMMs) has the potential to break off the trade‐off. Herein, a solvent‐assisted linker exchange‐based strategy is reported to introduce fluoroalkyl into metal–organic framework‐808 (MOF‐808). The pore size of fluorinated MOF‐808 can be adjusted with fluoroalkyl of different chain length (like trifluoromethyl and pentafluoropropyl). Then, the fluorinated MOF‐808/polyether block amide (PEBA) MMMs are prepared for the PV of n‐butanol/water. Compared with pristine PEBA membrane, 20 wt% 3F‐MOF‐808(P)/PEBA MMMs (3F = ‐CF3 group; P = postmodification method) exhibit 69% increase in permeation flux and 33% increase in separation factor in the PV of 2.5 wt% n‐butanol aqueous solutions at 70 °C. Based on Grand Canonical Monte Carlo and molecular dynamics simulations, fluorinated MOF‐808 shows better butanol affinity (pull effect) and stronger water repulsion ability (push effect). And the “push–pull effect” between fluorinated MOF‐808 with butanol/water is helpful to enhance the PV performance of MMMs. The application of “push–pull effect” provides a new strategy for the rational design of high‐performance MMMs, which is of great significance for the in‐depth research and application of PV technology.

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Guo, Zhongqi, Keyume Ablajan und Wenxu Fan. „N-acetylation of aromatic amines by one-pot route“. Letters in Organic Chemistry 21 (26.10.2023). http://dx.doi.org/10.2174/0115701786266810231005103940.

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aims: To achieve acylation of aryl amine via one-pot route. background: Amides are one of the most common and important structural motifs. Several different strategies have been employed to produce acetamide. However, some of these methods require bases, prolonged reaction times, metal catalysis, or toxic reagents. To overcome these limitations, a new method for the synthesis of N-acetanilide is needed. objective: We have to develope an economical, efficient, and metal-free strategy for synthesizing N-acetanilide by reacting aniline with CH3CN and DMSO. method: The amidation was performed in presence of H2O and K2S2O8 in a mixed solvent (CH3CN:DMSO). result: A series of amide compounds using K2S2O8 as the oxidant and amines as substrates in acetonitrile and water without any transition metals is reported. conclusion: The method uses simple, easily available materials in a straightforward protocol that allows the ease of isolating the products other: No other contents.

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Dissertationen zum Thema "Amide-water mixed solvents"

Das, Debasis. „Ion association and solvation of Alkali metal and tetraalkylammonium ions in N N Dimethylacetamide and amide-water mixed solvents“. Thesis, University of North Bengal, 2003. http://hdl.handle.net/123456789/703.

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Buchteile zum Thema "Amide-water mixed solvents"

Zhang, Xiaoming, Wenwen Deng und Jing Wang. „Preparation and Characteristic of Waterborne Acrylate Adhesive“. In Proceedings of the 2022 International Conference on Smart Manufacturing and Material Processing (SMMP2022). IOS Press, 2022. http://dx.doi.org/10.3233/atde220836.

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Aqueous emulsion acrylic adhesive was prepared by batch emulsion polymerization With 2-ethylhexyl acrylate (2-EHA) and butyl acrylate (BA) as soft monomers, methyl methacrylate (MMA) as hard monomer, acrylic acid (AA), acrylic amide (AM) and hydroxyethyl acrylate (HEA) as hydrophilic functional monomers, dodecanethiol (NDM) as molecular weight regulator, Sodium dodecyl benzene sulfonate (SDBS) and octyl phenol polyoxyethylene ether (op-10) as mixed emulsifiers, ammonium persulfate (APS) as initiator, and distilled water (H2O) as solvent. The effects of monomer, emulsifier, initiator, reaction temperature and time on the properties of the synthetic adhesive were also discussed. The emulsifier accounted for 4% of the monomer, and the initiator accounted for 1%. This method greatly reduces the preparation time, improves the preparation efficiency, and facilitates the operation and production. The prepared aqueous acrylate emulsion was white and blue light, stable and small odor, good water resistance, solid content of 42.13%, viscosity of 857.1 mPa·s, peel strength of 2.647 N·(25mm)–1 through calcium stability. waterborne acrylate adhesive by water as a dispersion medium and have the advantages of high solid content, safety, non-toxicity and low cost, which can meet the needs of packaging and printing fields.

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