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Academic literature on the topic 'Dimethoxyethane]'

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Published: 9 March 2023
Last updated: 10 March 2023

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Journal articles on the topic "Dimethoxyethane]"

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Neumüller, Bernhard, Gudrun Stieglitz, and Kurt Dehnicke. "Notizen: Die Kristallstruktur von MgCl2(1,2-Dimethoxyethan)2 / Crystal Structure of MgCl2(1,2-Dimethoxyethane)2." Zeitschrift für Naturforschung B 48, no. 8 (August 1, 1993): 1151–54. http://dx.doi.org/10.1515/znb-1993-0821.

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MgCl2(DME)2 has been prepared by reaction of MgCl2 with excess dimethoxyethane (DME) in n-pentane solution as white crystals, which are soluble in organic solvents. The crystal structure was determined by X-ray methods. Space group P21/c, Z=4,2512 observed unique reflections, R=0.050. Lattice dimensions at –70°C: a = 1338.9(1), b = 845.1(1), c = 1315.3(2) pm, β = 112.69(1)°. The magnesium atom is in a distorted octahedral coordination by the two chlorine atoms in cis-positions and by the four oxygen atoms of two chelating 1,2-dimethoxyethane molecules.
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Näther, C., T. Hauck, and H. Bock. "Sodium Tetraphenylcyclopentadienide Bis(dimethoxyethane)." Acta Crystallographica Section C Crystal Structure Communications 52, no. 3 (March 15, 1996): 570–72. http://dx.doi.org/10.1107/s0108270195010687.

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Yoshio, M., H. Nakamura, M. Hyakutake, S. Nishikawa, and K. Yoshizuka. "Conductivities of 1,2-dimethoxyethane or 1,2-dimethoxyethane-related solutions of lithium salts." Journal of Power Sources 41, no. 1-2 (January 1993): 77–86. http://dx.doi.org/10.1016/0378-7753(93)85006-a.

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Ritter, Andrea, Hermann Poschenrieder, and Franz Bracher. "Triethyloxonium Tetrafluoroborate/1,2-Dimethoxyethane – a Versatile Substitute for Trimethyloxonium Tetrafluoroborate in O-Methylation Reactions." Zeitschrift für Naturforschung B 64, no. 4 (April 1, 2009): 427–33. http://dx.doi.org/10.1515/znb-2009-0412.

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The triethyloxonium tetrafluoroborate/1,2-dimethoxyethane (TEO/DME) mixture is a versatile and cheap substitute for trimethyloxonium tetrafluoroborate in O-methylations of pyrrolin-2-ones, quinolones, acridones, and 1-oxo-β -carbolines. Undesired O-ethylation can be avoided by preincubation of triethyloxonium tetrafluoroborate and 1,2-dimethoxyethane for 1 h, prior to addition of the substrate. In the course of these investigations it was found that the structures assigned to the alkaloids taraxacine A and B are erroneous.
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Aparicio, Santiago, Rafael Alcalde, José Luis Trenzado, María N. Caro, and Mert Atilhan. "Study of Dimethoxyethane/Ethanol Solutions." Journal of Physical Chemistry B 115, no. 28 (July 21, 2011): 8864–74. http://dx.doi.org/10.1021/jp2029328.

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Kucharska, MAŁGORZATA, and Wiktor Wesołowski. "1,2-Dimethoxyethane Determination in working air with gas chromatography-mass spectrometer." Podstawy i Metody Oceny Środowiska Pracy 33, no. 2(92) (June 29, 2017): 133–47. http://dx.doi.org/10.5604/01.3001.0010.0062.

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Under normal conditions, 1,2-dimethoxyethane (DME) is a colorless and transparent liquid with a faint odor of ether, very soluble in water, charac-terized by a high vapor pressure. It belongs to the group of alkyl ethers solvents, derivatives of eth-ylene glycol. 1,2-Dimethoxyethane is used as an ex-cipient in preparing and processing industrial chemicals, in the production of fluoric polymers and as a solvent and cleaning agent in the microe-lectronics and printing industries. In the literature there are no data on the acute and chronic toxicity of 1,2-dimethoxyethane. However, long-term epidemiological studies on compounds of similar chemical structure suggest that human exposure to ethylene glycol alkyl ethers can ad-versely affect fertility and fetal development, and hematological parameters. The aim of this study was to develop and validate a sensitive method for determining concentrations of 1,2-dimethoxyethane in workplace air in the range from 1/20 to 2 MAC values, in accordance with the requirements of Standard No. PN-EN 482+A1: 2016-1. The study was performed using a gas chromato-graph (GC). A 7890B Agilent Technologies gas chromatograph with a 5977A mass spectrometry detector (MSD), HP PONA (50 m; 0,2 mm; 0,5 μm) capillary analytical column, auto sampler and Mass Hunter software was used for chromato-graphic separations. The method is based on the adsorption of 1,2-di-methoxyethane on charcoal, desorption with di-chloromethane and GC/MSD analysis of the re-sulting solution. Extraction efficiency of 1,2-di-methoxyethane from charcoal was 96.4%. Samples of 1,2-dimethoxyethane can be stored in refrigera-tor for up to 28 days. The use of a HP-PONA capil-lary column enabled selective determination of 1,2-dimethoxyethane in a mixture of dichloromethane, toluene, carbon disulfide, ethylene and propylene glycol and other compounds. The method is linear (r = 0.9999) within the inves-tigated working range from 5 to 200 μg/ml, which is equivalent to air concentrations from 0.5 to 20 mg/m3 for a 10-L air sample. The limit of quan-tification (LOQ) is 1,306 μg/ml. The analytical method described in this paper ena-bles selective determination of 1,2-dimethoxye-thane in workplace atmosphere in presence of other compounds at concentrations from 0.5 to 20 mg/m3 (1/20 ÷ 2 MAC value). The method is precise, accurate and it meets the criteria for proce-dures for measuring chemical agents listed in Standard No. PN-EN 482+A1: 2016-1. The method can be used for assessing occupational exposure to 1,2-dimethoxyethane and associated risk to work-ers’ health. The developed method of determining 1,2-di-methoxyethane has been recorded as an analytical procedure (see Appendix).
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Yang, Yuexi, Yugang Shi, Lifang Feng, and Shiyi Tian. "Coupling of Bioreaction and Separation via Novel Thermosensitive Ionic Liquids Applied in the Baker’s Yeast-Catalyzed Reduction of Ethyl 2-oxo-4-phenylbutyrate." Molecules 25, no. 9 (April 28, 2020): 2056. http://dx.doi.org/10.3390/molecules25092056.

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The use of baker’s yeast to reduce ethyl 2-oxo-4-phenylbutyrate (EOPB) in conventional biphasic systems is hindered by low productivities due to mass transfer resistance between the biocatalyst and the substrate partitioned into two different phases. To overcome the limitation, a new reaction-separation coupling process (RSCP) was configured in this study, based on the novel thermosensitive ionic liquids (ILs) with polyoxyethylene-tail. The solubility of ILs in common solvents was investigated to configure the unique thermosensitive ionic liquids–solvent biphasic system (TIBS) in which the reduction was performed. [(CH3)2N(C2H5)(CH2CH2O)2H][PF6] (c2) in 1,2-dimethoxyethane possesses the thermosensitive function of homogeneous at lower temperatures and phase separating at higher temperatures. The phase transformation temperature (PTT) of the mixed system of c2/1,2-dimethoxyethane (v/v, 5:18) was about 33 °C. The bioreaction takes place in a “homogeneous” liquid phase at 30 °C. At the end of each reduction run, the system temperature is increased upon to the PTT, while c2 is separated from 1,2-dimethoxyethane with turning the system into two phases. The enantiomeric excesses (e.e.) of ethyl (R)-2-hydroxy-4-phenylbutyrate ((R)-EHPB) increased about 25~30% and the yield of ethyl-2-hydroxy-4-phenylbutyrate (EHPB) increased 35% in TIBS, compared with the reduction in 1,2-dimethoxyethane. It is expected that the TIBS established in this study could provide many future opportunities in the biocatalysis.
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Sima, Sergiu, and Catinca Secuianu. "The Effect of Functional Groups on the Phase Behavior of Carbon Dioxide Binaries and Their Role in CCS." Molecules 26, no. 12 (June 18, 2021): 3733. http://dx.doi.org/10.3390/molecules26123733.

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In recent years we have focused our efforts on investigating various binary mixtures containing carbon dioxide to find the best candidate for CO2 capture and, therefore, for applications in the field of CCS and CCUS technologies. Continuing this project, the present study investigates the phase behavior of three binary systems containing carbon dioxide and different oxygenated compounds. Two thermodynamic models are examined for their ability to predict the phase behavior of these systems. The selected models are the well-known Peng–Robinson (PR) equation of state and the General Equation of State (GEOS), which is a generalization for all cubic equations of state with two, three, and four parameters, coupled with classical van der Waals mixing rules (two-parameter conventional mixing rule, 2PCMR). The carbon dioxide + ethyl acetate, carbon dioxide + 1,4-dioxane, and carbon dioxide + 1,2-dimethoxyethane binary systems were analyzed based on GEOS and PR equation of state models. The modeling approach is entirely predictive. Previously, it was proved that this approach was successful for members of the same homologous series. Unique sets of binary interaction parameters for each equation of state, determined for the carbon dioxide + 2-butanol binary model system, based on k12–l12 method, were used to examine the three systems. It was shown that the models predict that CO2 solubility in the three substances increases globally in the order 1,4-dioxane, 1,2-dimethoxyethane, and ethyl acetate. CO2 solubility in 1,2-dimethoxyethane, 1.4-dioxane, and ethyl acetate reduces with increasing temperature for the same pressure, and increases with lowering temperature for the same pressure, indicating a physical dissolving process of CO2 in all three substances. However, CO2 solubility for the carbon dioxide + ether systems (1,4-dioxane, 1,2-dimethoxyethane) is better at low temperatures and pressures, and decreases with increasing pressures, leading to higher critical points for the mixtures. By contrast, the solubility of ethyl acetate in carbon dioxide is less dependent on temperatures and pressures, and the mixture has lower pressures critical points. In other words, the ethers offer better solubilization at low pressures; however, the ester has better overall miscibility in terms of lower critical pressures. Among the binary systems investigated, the 1,2-dimethoxyethane is the best solvent for CO2 absorption.
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Yu, Weiqiang, Fang Lu, Qianqian Huang, Rui Lu, Shuai Chen, and Jie Xu. "Selective synthesis of dimethoxyethane via directly catalytic etherification of crude ethylene glycol." Green Chemistry 19, no. 14 (2017): 3327–33. http://dx.doi.org/10.1039/c7gc00659d.

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Abe, Akihiro, and Katsuhiro Inomata. "Gas phase NMR of 1,2-dimethoxyethane." Journal of Molecular Structure 245, no. 3-4 (May 1991): 399–402. http://dx.doi.org/10.1016/0022-2860(91)87114-w.

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Dissertations / Theses on the topic "Dimethoxyethane]"

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RAMADAN, DOAA REDA MOHAMED. "PALLADIUM CATALYZED REACTIONS: REDUCTIVE CYCLIZATION OF NITROARENES, AND OXIDATIVE CARBONYLATION OF ANILINE." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/819652.

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Palladium Catalyzed Reactions: Reductive Cyclization of Nitroarenes, and Oxidative Carbonylation of Aniline Abstract: The thesis is divided into two main chapters: reductive cyclization of nitroarenes, and oxidative carbonylation of aniline. The first chapter involves developing a catalytic system for carbazoles synthesis through reductive cyclization of 2-nitrobiphenyls employing phenyl formate as an in-situ source of CO. Thus, the synthetic chemist can avoid handling pressurized CO lines and perform the reaction in a pressure tube, a cheap and readily available tool for any laboratory. Moreover, the developed protocol can tolerate both air and moisture and can be performed using undried and undistilled commercial DMF. Several carbazoles bearing a wide range of substituents were synthesized in good to excellent yields including some with valuable pharmaceutical or thermo/electrical applications. The reaction could be performed on the grams scale affording carbazole in a very good yield (85%) without the need for chromatographic purification, making our synthetic strategy even more attractive and economically advantageous. The second chapter deals with the palladium/iodide couple which is the most investigated catalytic system for the oxidative carbonylation of amines to give ureas or carbamates. In reinvestigating it, we found that the most prominent role of iodide is to etch the stainless steel of the autoclave employed in most of previous works, releasing in solution small amounts of iron salts. The latter are much better promoters than iodide itself. Iron and iodide have a complex interplay and, depending on relative ratios, can even deactivate each other. The presence of a halide is beneficial, but chloride is better than iodide in this respect. The ideal Fe/Pd ratio is around 10, but even an equimolar amount of iron with respect to palladium (0.02 mol% with respect to aniline, corresponding to 12 ppm Fe with respect to the whole solution) is sufficient to boost the activity of the catalytic system. Such small amount may also come from Fe(CO)5 impurities present in the CO gas when stored in steel tanks. The role of the solvent has also been investigated. It was found that the reason for the better selectivity in some cases is at least in part due to a hydrolysis of the solvent itself, which removes the coproduced water.
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Despres, Aurélien. "Mise au point de nouvelles résines aminoplastes écologiques à base de diméthoxyéthanal et sans formaldéhyde pour application en tant que colles pour panneaux de particules." Nancy 1, 2006. http://www.theses.fr/2006NAN10101.

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L'@objectif de ce travail est la mise au point de nouveaux adhésifs destinés à la fabrication de panneaux de particules sans formaldéhyde. Cette molécule étant cancérogène, un autre aldéhyde, le diméthoxyéthanal (DME), non toxique, est utilisé pour formuler ces nouveaux adhésifs écologiques. Afin de mener à bien cette étude, deux voies de recherche principales sont établies. Dans un premier temps, la synthèse de résines est étudiée dans le but d'obtenir un produit stable et le plus réactif possible. La deuxième partie du travail consiste à utiliser des additifs en post addition, tels que des isocyanates et des latex, afin d'augmenter considérablement les performances des résines. Tout au long de l'étude, des panneaux de particules sont fabriqués et testés en accord avec les normes et dans le but de se rapprocher des impératifs industriels. Les formulations mises au point et les paramètres de mise en œuvre sont ainsi optimisés
This@ work aimes at formulating new adhesives intended for the manufacture of particleboard without formaldehyde. This molecule being carcinogenic, another aldehyde: the non-toxic dimethoxyethanal (DME), is being used to formulate these new environnement-friendly adhesives. To achieve a goal of this study, two main research approaches were taken. First, resin synthesis was studied with the aim of obtaining the most reactive, stable long-life products. The second part of the worl consists in using post-addition additives, such as isocyanates and latexes, to increase significantly the performance of the resins. Throughout the study, particleboards are made and tested, according to the relevant standards and with the goal of getting to industrial manufacturing conditions. Thus, the finalised formulations and the application parameters have been optimised
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Book chapters on the topic "Dimethoxyethane]"

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Wohlfarth, Christian. "Viscosity of 1,2-dimethoxyethane." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 140. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_120.

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Wohlfarth, Ch. "Viscosity of 1,2-dimethoxyethane." In Supplement to IV/18, 276–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_127.

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Wohlfarth, Ch. "Refractive index of 1,2-dimethoxyethane." In Refractive Indices of Pure Liquids and Binary Liquid Mixtures (Supplement to III/38), 224–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75291-2_113.

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Ontiveros, C. D., J. A. Morrison, R. Hani, and R. A. Geanangel. "Bis(Trifluoromethyl)Cadmium.1,2-Dimethoxyethane." In Inorganic Syntheses, 55–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132555.ch17.

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Wohlfarth, Ch. "Dielectric constant of 1,2-dimethoxyethane." In Supplement to IV/6, 263–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75506-7_126.

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Wohlfarth, Ch. "Surface tension of 1,2-dimethoxyethane." In Supplement to IV/16, 135. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75508-1_87.

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Wohlfarth, Christian. "Refractive index of 1,2-dimethoxyethane." In Optical Constants, 166. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49236-9_153.

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Wohlfarth, Christian. "Surface tension of 1,2-dimethoxyethane." In Surface Tension of Pure Liquids and Binary Liquid Mixtures, 78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-48336-7_75.

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Wohlfarth, Christian. "Static dielectric constant of 1,2-dimethoxyethane." In Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures, 76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48168-4_75.

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Wohlfarth, Ch. "Viscosity of the mixture (1) methanol; (2) 1,2-dimethoxyethane." In Supplement to IV/18, 1081. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_609.

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Conference papers on the topic "Dimethoxyethane]"

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Li, Weixing, Sonia Melandri, Assimo Maris, Laura Favero, Luca Evangelisti, Camilla Calabrese, and Annalisa Vigorito. "THE MICROWAVE SPECTROSCOPY STUDY OF 1,2-DIMETHOXYETHANE." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.td01.

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