Results 201 to 210 of about 7,821 (247)
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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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Solvatochromism of fluorescein in aqueous aprotic solvents
Journal of Molecular Liquids, 2016Abstract Fluorescein solvatochromism was studied in pure aprotic solvents dimethylsulfoxide, N,N-dimethylformamide, acetonitrile and acetone, and their aqueous mixtures. The type and extent of solvent effects were identified and interpreted based on the electronic structure of fluorescein and the nature of the solvent.
Fereshteh Naderi, Ali Farajtabar
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Anodic oxidation of furans in aprotic solvents
Electrochimica Acta, 1984Abstract The anodic oxidation of furans in the presence of substituted 1,4-napthoquinones leads to coupling of the two. In the absence of the quinones, furan oligomers are formed. Further oxidation of these oligomers leads to the formation of conductive polymer films at the electrode surface.
S. Pons, A.Scott Hinman
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Spontaneous trisulfide metathesis in polar aprotic solvents
Nature ChemistrySulfur-sulfur bonds are ubiquitous across broad classes of natural products, peptides and proteins, drug molecules, and synthetic polymers and materials. The ability to make and break these bonds in a controlled manner is critical for their many scientific and technological applications.
Harshal D. Patel +16 more
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The Solubility of Polyimides in Polar Aprotic Solvents
High Performance Polymers, 2002Activity coefficients and Gibbs free energies of mixing were calculated for aromatic polyimides in various polar aprotic solvents. Group additivity approaches were used to derive approximate solubility parameters for the polymers. Free energies of mixing were found to be negative, and limiting activity coefficients were indicative of very strong ...
David Suleiman-Rosado +1 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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Mannich reactiohs of aryltrialkylstannunes in aprotic solvents
Tetrahedron, 1989Abstract Aryltributyl- and aryltrimethyl-stannanes react with a range of N , N -dialkylmethylene-imonium salts to afford N , N -dialkylaminomethyl derivatives in good yields. The method can be used to obtain regloisomers that are not available using classical procedures.
Mark S. Cooper +4 more
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Polarography of organic compounds in aprotic solvents
Talanta, 1965Abstract A review of the polarography of organic compounds in aprotic solvents is presented.
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Replacing polar aprotic solvents with water in organic synthesis
Current Opinion in Green and Sustainable Chemistry, 2023Yanlong Gu
exaly