Results 231 to 240 of about 9,719 (268)
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Proton solvation in protic and aprotic solvents
Journal of Computational Chemistry, 2016Protonation pattern strongly affects the properties of molecular systems. To determine protonation equilibria, proton solvation free energy, which is a central quantity in solution chemistry, needs to be known. In this study, proton affinities (PAs), electrostatic energies of solvation, and pKA values were computed in protic and aprotic solvents.
Emanuele, Rossini, Ernst-Walter, Knapp
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Russian Journal of General Chemistry, 2003
The standard enthalpies of solution of benzene at 25°C in alcohols (methanol, 1-propanol, 1-pentanol, 1-decanol), aprotic solvents (1,4-dioxane, acetone, acetonitrile, dimethyl sulfoxide, dimethylformamide, propylene carbonate), and mixtures of methanol with these aprotic solvents were determined.
N. G. Manin +2 more
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The standard enthalpies of solution of benzene at 25°C in alcohols (methanol, 1-propanol, 1-pentanol, 1-decanol), aprotic solvents (1,4-dioxane, acetone, acetonitrile, dimethyl sulfoxide, dimethylformamide, propylene carbonate), and mixtures of methanol with these aprotic solvents were determined.
N. G. Manin +2 more
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Cellulose solutions in dipolar aprotic solvents
Polymer Science Series A, 2010Preparation conditions and properties of cellulose solutions in DMAA containing 7–8% lithium chloride are considered. Investigation of the optical anisotropy and structure of cellulose solutions in this solvent confirms that the LS state is attained with an increase in the concentration of cellulose.
A. K. Dibrova, O. A. Khanchich
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Ozonolysis of verbenone in aprotic solvents
Mendeleev Communications, 2009The ozonolysis of verbenone in methylene chloride and acetonitrile at –60 and 0 °C proceeds with cleavage of the double bond and neighbouring σ-bond to give (1 R ,3 S )-acetyl-2,2-dimethylcyclobutane carboxylic acid. The mechanism of the reaction has been proposed.
Olga S. Kukovinets +7 more
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Electrolyte solvation in aprotic solvents
Journal of Power Sources, 1989Abstract The nature of specific ionsolvent, ionion and solventsolvent interactions is reviewed in the context of their relation to the development of lithium batteries. For aprotic solvents of permittivities > ≈ 15, the “medium effect” has been found to offer insights into basic problems ( e.g.
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Electrode Kinetics in Nonaqueous Aprotic Solvents
Journal of The Electrochemical Society, 1985Etudes, a l'aide de la methode d'impedance faradique, de la cinetique de reduction de Na + en presence d'une electrode a goutte de mercure, dans 4 solvants aprotiques (carbonate de propylene, DMF, DMSO et acetonitrile)
Jacob Jorné, Purnachandra G. Pai
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Electrochemical reduction of benzenesulphenyl chloride in aprotic solvents
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1978The cathodic behaviour of benzenesulphenyl chloride has been studied at a platinum electrode in acetonitrile by using cyclic voltammetry and controlled potential electrolysis. It has been evidentiated that PhSCl gives rise, in an one-electron reduction process, to PhSSPh and Cl− according to 2PhSCl+2e−→PhSSPh+2Cl− The chloride ions so generated ...
G. Bontempelli +3 more
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Bulletin des Sociétés Chimiques Belges, 1982
For base-catalysed aromatic nucleophilic substitution reactions in benzene, catalysis by added base is observed irrespective of whether the catalyst is a stronger or a weaker base than the nucleophile. In acetonitrile, catalysis is only observed if the catalyst has either approximately the same strength or is a stronger base than the nucleophile. These
Titus O. Bamkole +2 more
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For base-catalysed aromatic nucleophilic substitution reactions in benzene, catalysis by added base is observed irrespective of whether the catalyst is a stronger or a weaker base than the nucleophile. In acetonitrile, catalysis is only observed if the catalyst has either approximately the same strength or is a stronger base than the nucleophile. These
Titus O. Bamkole +2 more
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Nucleophilic Substitution in Dipolar Aprotic Solvents: Hexamethylphosphoric triamide
Helvetica Chimica Acta, 1972AbstractThe rate of the reaction between ethyl tosylate and chloride as well as bromide ion has been measured in hexamethylphosphoric triamide in the presence of several counterions. Rate constants for the free ions at 25.0° are 14.4 mole−1 for chloride and 2.0 mole−1min−1 for bromide, both independent of the cation used.
Muller, Paul, Siegfried, Bernard
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Journal of Thermal Analysis, 1983
The process of solid-phase cyclodehydration of films cast from solutions of poly(acid amides) (PAA) in dimethylformamide, dimethylacetamide and N-methyl-2-pyrrolidone has been investigated by mass-spectrometric thermal analysis (MTA). It is shown that MTA is a structure-sensitive method making it possible to follow the appearance and changes in the ...
Yu. N. Sazanov +5 more
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The process of solid-phase cyclodehydration of films cast from solutions of poly(acid amides) (PAA) in dimethylformamide, dimethylacetamide and N-methyl-2-pyrrolidone has been investigated by mass-spectrometric thermal analysis (MTA). It is shown that MTA is a structure-sensitive method making it possible to follow the appearance and changes in the ...
Yu. N. Sazanov +5 more
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