Universidade da Coruña. UDCDspace
(405 recursos)
UDCDspace é o repositorio dixital da Universidade da Coruña, un sistema que proporciona de xeito estable e seguro a preservación de documentos dixitais produto da actividade científica e institucional da UDC, e facilita a súa accesibilidade en Internet.
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Tautomerization of 2-acetylcyclohexanone in assemblies of cationic surfactants. Nitrosation of the enol. - Iglesias, Emilia
The kinetic study of the keto-enol interconversion of 2-acetylcyclohexanone (ACHE) has been performed in organic solvents such as dimethylsulfoxide (DMSO), 1-propanol (1-PrOH), 2-propanol (2-PrOH), methanol (MeOH), dioxane, tetrahydrofuran (THF), and acetonitrile (MeCN) and in aqueous micellar solutions of the cationic surfactants tetradecyltrimethylammonium chloride (TTACl) and tetradecyltrimethylammonium bromide (TTABr) at 25 ºC. Either the solvent-assisted or H+-catalysed reaction rates of tautomerization are strongly reduced in both organic solvents and in micellar medium. In 70% v/v solvent-water or at fixed concentration of any cationic surfactant, the observed rate constant moderately increases with [H+]. The nitrosation of the enol has also been studied...
(650226 bytes; application/pdf) - 28-feb-2006
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Solvent Effects versus Concentration Effects in determining Rates of Base-catalysed Keto-enol Tautomerization - Iglesias, Emilia
Solvent effects of homogeneous media (such as solvent-water mixtures) in chemical reactivity may be interpreted as due to solvent polarity and/or molecular structure of solvent molecules. In microheterogeneous media (such as aqueous micellar solutions), solvent effects in reaction rates must include concentration effects, in addition to changes in the solvent polarity of the micelle interface where the reaction is assumed to occur.
In this work, we measured rates of keto-enol tautomerization in 2-acetyl-cyclohexanone (ACHE) and 2-acetyl-1-tetralone (ATLO) systems performed in dimethylsulfoxide (DMSO)-water mixtures and in aqueous micellar solutions of both anionic and cationic surfactants carried out in the presence of buffers....
(705818 bytes; application/pdf) - 28-feb-2006
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