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Hideo Ogawa - One of the best experts on this subject based on the ideXlab platform.
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excess thermodynamic properties of 2 ethoxyethanol 1 4 dioxane or 1 2 Dimethoxyethane at temperatures between 283 15 and 313 15 k
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.
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Excess thermodynamic properties of (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane) at temperatures between (283.15 and 313.15) K
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.
Peter Langer - One of the best experts on this subject based on the ideXlab platform.
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e-EROS Encyclopedia of Reagents for Organic Synthesis - 2‐Azido‐1,1‐Dimethoxyethane
Encyclopedia of Reagents for Organic Synthesis, 2008Co-Authors: Peter LangerAbstract:[114790-46-4] C4H9N3O2 (MW 131.12) InChI = 1S/C4H9N3O2/c1-8-4(9-2)3-6-7-5/h4H,3H2,1-2H3 InChIKey = XEOZJWABAGSZMK-UHFFFAOYSA-N Physical Data: colourless liquid, bp not reported. Solubility: soluble in most organic solvents. Preparative Methods: 2-azido-1,1-Dimethoxyethane can be prepared by the reaction of 1-chloro-2,2-Dimethoxyethane with sodium azide in the presence of potassium iodide in DMSO (4 days, 90 °C, 95% yield).1 Alternatively, 1-bromo-2,2-Dimethoxyethane can be used (5 days, 90 °C, 85% yield).2 Handling, Storage, and Precautions: the handling of low-molecular weight azides is dangerous, due to their potentially explosive character. 2-Azido-1,2-Dimethoxyethane should be handled with great care and extreme caution. Neat azides must not be heated or distilled and all reactions should be carried out on a small scale. The use of a fume hood and safety shield is highly recommended. The compound should be stored at low temperature (−18°C) under an inert atmosphere.
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regioselective synthesis of 1 2 2 dimethoxyethyl 1 2 3 triazoles by copper i catalyzed 3 2 cyclization of 2 azido 1 1 Dimethoxyethane with alkynes
Tetrahedron Letters, 2007Co-Authors: Muhammad Sher, Helmut Reinke, Peter LangerAbstract:1-(2,2-Dimethoxyethyl)-1,2,3-triazoles are regioselectively prepared by copper(I)-catalyzed [3+2] cyclizations of 2-azido-1,1-Dimethoxyethane with alkynes.
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regioselective synthesis of functionalized furans by cyclization of 1 3 bis silyl enol ethers with 1 chloro 2 2 Dimethoxyethane
European Journal of Organic Chemistry, 2005Co-Authors: Esen Bellur, Helmar Gorls, Peter LangerAbstract:Cyclization of 1,3-bis-silyl enol ethers with 1-chloro-2,2-Dimethoxyethane allowed an efficient, regio- and diastereoselective synthesis of a variety of 2-alkylidene-4-methoxytetrahydrofurans. The TFA-mediated elimination of methanol resulted in the formation of functionalized furans. Similarly, 2,3,3a,4,5,6-hexahydro-2,3-benzofurans were prepared and transformed into 4,5,6,7-tetrahydro-2,3-benzofurans by treatment with TFA. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Miao Wang - One of the best experts on this subject based on the ideXlab platform.
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insight into the effect of lithium dendrite suppression by lithium bis fluorosulfony imide 1 2 Dimethoxyethane electrolytes
Electrochimica Acta, 2018Co-Authors: Peng Zhang, Tong Wang, Miao WangAbstract:Abstract The highly concentrated lithium bis(fluorosulfonyl)imide/1,2–Dimethoxyethane electrolyte is in the good graces of researchers due to its excellent electrochemical performance in lithium-metal batteries. However, our study reveals that the more concentrated electrolyte incurred more drastic lithium-dendrite growth. Minimum onset time (tsc) of lithium-dendrite formation of only 7.4 and 18.6 h are observed in 4 M lithium bis(fluorosulfonyl)imide/1,2-Dimethoxyethane electrolyte galvanostatically polarized at current densities of 1.0 and 0.5 mA cm−2, respectively. In contrast, tsc are as long as around 56 and > 190 h in 1 M electrolyte at 1.0 and 0.5 mA cm−2, respectively. We found that 1 M electrolyte has comprehensive advantages in many respects, including Li+ transference number (0.61), salt diffusion coefficient (1.47 × 10−5 cm2 s−1), ionic conductivity (1.52 × 10−2 S cm−1), low polarization potential and solid electrolyte interphase protection, which collectively make contributions to outstanding lithium-dendrite suppression.
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Insight into the effect of lithium-dendrite suppression by lithium bis(fluorosulfony)imide/1,2-Dimethoxyethane electrolytes
Electrochimica Acta, 2018Co-Authors: Peng Zhang, Tong Wang, Miao WangAbstract:Abstract The highly concentrated lithium bis(fluorosulfonyl)imide/1,2–Dimethoxyethane electrolyte is in the good graces of researchers due to its excellent electrochemical performance in lithium-metal batteries. However, our study reveals that the more concentrated electrolyte incurred more drastic lithium-dendrite growth. Minimum onset time (tsc) of lithium-dendrite formation of only 7.4 and 18.6 h are observed in 4 M lithium bis(fluorosulfonyl)imide/1,2-Dimethoxyethane electrolyte galvanostatically polarized at current densities of 1.0 and 0.5 mA cm−2, respectively. In contrast, tsc are as long as around 56 and > 190 h in 1 M electrolyte at 1.0 and 0.5 mA cm−2, respectively. We found that 1 M electrolyte has comprehensive advantages in many respects, including Li+ transference number (0.61), salt diffusion coefficient (1.47 × 10−5 cm2 s−1), ionic conductivity (1.52 × 10−2 S cm−1), low polarization potential and solid electrolyte interphase protection, which collectively make contributions to outstanding lithium-dendrite suppression.
Katsutoshi Tamura - One of the best experts on this subject based on the ideXlab platform.
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Excess enthalpies and excess volumes of (2-methoxyethanol + 1,4-dioxane) and (1,2-Dimethoxyethane + benzene) at temperatures between 283.15 K and 313.15 K
The Journal of Chemical Thermodynamics, 2003Co-Authors: Hiroyuki Ohji, Katsutoshi TamuraAbstract:Abstract The measurement of excess enthalpies, H E , at T =298.15 K and densities at temperatures between 283.15 K and 313.15 K are reported for the (2-methoxyethanol + 1,4-dioxane) and (1,2-Dimethoxyethane + benzene) systems. The values of H E and the excess volumes, V E , are positive, and the temperature dependence of V E is quite small for (2-methoxyethanol + 1,4-dioxane). The (1,2-Dimethoxyethane + benzene) system shows a negative H E and sigmoid curves in V E , which change sign from positive to negative with an increase in 1,2-Dimethoxyethane. The temperature dependence of V E for this system is negative.
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Excess enthalpies and excess heat capacities of binary mixtures of (cyclohexanone, or 2-butanone, or 1,4-dioxane + 1,2-Dimethoxyethane) and (1,4-dioxane + 1,2-Dimethoxyethane) atT = 298.15 K
The Journal of Chemical Thermodynamics, 2001Co-Authors: Shipra Baluja, Takasuke Matsuo, Katsutoshi TamuraAbstract:Abstract Excess enthalpies and excess heat capacities of { x 2-butanone + (1 − x )1,4-dioxane}, and { x cyclohexanone, or 2-butanone, or 1,4-dioxane + (1 − x )1,2-Dimethoxyethane} were measured at T = 298.15 K. Excess enthalpies were negative for { x 2-butanone + (1 − x )1,2-Dimethoxyethane}, and negative with a small positive part in the region of x > 0.8 for { x cyclohexanone + (1 − x )1,2-Dimethoxyethane}, whereas excess enthalpies of { x 2-butanone + (1 − x )1,4-dioxane} were positive as for { x cyclohexanone + (1 − x )1,4-dioxane} previously reported. Excess enthalpies of { x 1,4-dioxane + (1 − x )1,2-Dimethoxyethane} were positive. The results were compared with the systems reported earlier. Excess heat capacities are positive for { x 2-butanone + (1 − x )1,2-Dimethoxyethane} and { x cyclohexanone + (1 − x )1,2-Dimethoxyethane}, and negative for { x 2-butanone + (1 − x )1,4-dioxane} and { x 1,4-dioxane + (1 − x )1,2-Dimethoxyethane}. The last mixture shows a W-shaped curve of excess heat capacity.
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excess thermodynamic properties of 2 ethoxyethanol 1 4 dioxane or 1 2 Dimethoxyethane at temperatures between 283 15 and 313 15 k
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.
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Excess thermodynamic properties of (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane) at temperatures between (283.15 and 313.15) K
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.
Hiroyuki Ohji - One of the best experts on this subject based on the ideXlab platform.
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Excess enthalpies and excess volumes of (2-methoxyethanol + 1,4-dioxane) and (1,2-Dimethoxyethane + benzene) at temperatures between 283.15 K and 313.15 K
The Journal of Chemical Thermodynamics, 2003Co-Authors: Hiroyuki Ohji, Katsutoshi TamuraAbstract:Abstract The measurement of excess enthalpies, H E , at T =298.15 K and densities at temperatures between 283.15 K and 313.15 K are reported for the (2-methoxyethanol + 1,4-dioxane) and (1,2-Dimethoxyethane + benzene) systems. The values of H E and the excess volumes, V E , are positive, and the temperature dependence of V E is quite small for (2-methoxyethanol + 1,4-dioxane). The (1,2-Dimethoxyethane + benzene) system shows a negative H E and sigmoid curves in V E , which change sign from positive to negative with an increase in 1,2-Dimethoxyethane. The temperature dependence of V E for this system is negative.
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excess thermodynamic properties of 2 ethoxyethanol 1 4 dioxane or 1 2 Dimethoxyethane at temperatures between 283 15 and 313 15 k
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.
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Excess thermodynamic properties of (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane) at temperatures between (283.15 and 313.15) K
The Journal of Chemical Thermodynamics, 2000Co-Authors: Hiroyuki Ohji, Katsutoshi Tamura, Hideo OgawaAbstract:Measurements of the excess enthalpies HEatT = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyethanol + 1,4-dioxane or 1,2-Dimethoxyethane). Excess volumes VE, excess thermal expansivities αE, and the pressure derivatives of the excess enthalpies were estimated from the measured densities. The values of HEfor both systems are positive. However, the values of VEfor the 1,2-Dimethoxyethane system are negative, although they are positive for the 1,4-dioxane system as expected from the sign of HE. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecules.