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https://riquim.fq.edu.uy/files/original/1fbac941e79368d9efea80a26ea8ba6f.pdf
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Title
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Bibliografía Nacional Química
Description
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Contiene la producción científica nacional de los profesionales químicos e investigadores, durante el período 1929 hasta la fecha.
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Departamento de Documentación y Biblioteca
RIQUIM
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Title
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<strong>Computational Evidence Suggests That 1-Chloroethanol May Be an Intermediate in the Thermal Decomposition of 2-Chloroethanol into Acetaldehyde and HCl</strong>
Subject
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TERMODINAMICA
ACETALDEHIDO
CLOROETANOL
COMPUTACION-TEORIA
BIBLIOGRAFIA NACIONAL QUIMICA
2019
Abstract
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The dehalogenation of 2-chloroethanol (2ClEtOH) in the gas phase with and without the participation of catalytic water molecules has been investigated using methods rooted into the density functional theory. The well-known HCl elimination leading to vinyl alcohol (VA) was compared to the alternative elimination route toward oxirane and shown to be kinetically and thermodynamically more favorable. However, the isomerization of VA to acetaldehyde in the gas phase, in the absence of water, was shown to be kinetically and thermodynamically less favorable than the recombination of VA and HCl to form the isomeric 1-chloroethanol (1ClEtOH) species. At the ωB97X-D/cc-pVTZ level of calculation, this species is more stable than 2ClEtOH by about 6 kcal mol–1 at 298 K, and the reaction barrier for VA to 1ClEtOH is 23 kcal mol–1 versus 55 kcal mol–1 for the direct transformation of VA to acetaldehyde. In a successive step, 1ClEtOH can decompose directly to acetaldehyde and HCl with a lower barrier (29 kcal mol–1) than that of VA to the same products (55 kcal mol–1). The calculations were repeated using a single ancillary water molecule (W) in the complexes 2ClEtOH_W and 1ClEtOH_W. The latter adduct is now more stable than 2ClEtOH_W by about 8 kcal mol–1 at 298 K, implying that the water molecule increased the already higher stability of 1ClEtOH in the gas phase. However, this catalytic water molecule lowers dramatically the barrier for the interconversion of VA to acetaldehyde (from 55 to 7 kcal mol–1). This barrier is now smaller than the one for the conversion to 1ClEtOH (which also decreases, but not so much, from 23 to 13 kcal mol–1). Thus, it is concluded that while 1ClEtOH may be a plausible intermediate in the gas phase dehalogenation of 2ClEtOH, it is unlikely that it plays a major role in water complexes (or, by inference, aqueous solution). It is also shown that neither in the gas phase nor in the cluster with one water molecule, the oxirane path is more favorable than the VA alcohol path. Additionally, a direct conversion of 2ClEtOH to 1ClEtOH through a transition state which resembles a VA molecule in a complex with a chlorine atom and a hydrogen atom on both sides of this planar species was found. This reaction path has also lower activation energy than the conversion to oxirane but not as low as the conversion to VA.
Creator
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<strong>Salta, Zoi</strong>
<strong>Kosmas, Agnie Mylona</strong>
<a title="Curriculum Vitae" href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwjO5a_q6r_mAhX1IbkGHWsNAxYQFjAAegQIBBAH&url=https%3A%2F%2Fexportcvuy.anii.org.uy%2FCvEstatico%2F%3FurlId%3Da7868d1a46654e7a04ba7167141502086fa0cfad8b13463f75d90af715685994bc8f3eafaad6f6d2f6647277c9782143df93695c8a7d8e14295323ca2e2847d3%26formato%3Dpdf%26convocatoria%3D21&usg=AOvVaw3DgPJlf--GOsjsu4KZ-hpA" target="_self"><strong>Ventura, Oscar N.</strong></a>
<strong>Barone, Vicenzo</strong>
Source
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Journal of Physical Chemistry A v. 123, no. 10, 2019. -- p. 1983-1998
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American Chemical Society
Date
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2019
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<p><strong>Información sobre Derechos de Autor</strong></p>
<p>(Por favor lea este aviso antes de abrir los documentos u objetos)</p>
<p><strong>La legislación uruguaya protege el derecho</strong> de autor sobre toda creación literaria, científica o artística, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeción a lo establecido por el derecho común y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006)</p>
<p><strong>ADVERTENCIA -</strong> La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.</p>
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Artículo
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DOI: 10.1021/acs.jpca.8b11966
Acetaldehido
Cloroetanol
Computacion-Teoria
Termodinámica
-
https://riquim.fq.edu.uy/files/original/6d55bf4f70c954677d548b80558f3e9f.pdf
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https://riquim.fq.edu.uy/files/original/4f3771b8db70b64237eaf1810c4d7c86.jpg
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Title
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Bibliografía Nacional Química
Description
An account of the resource
Contiene la producción científica nacional de los profesionales químicos e investigadores, durante el período 1929 hasta la fecha.
Contributor
An entity responsible for making contributions to the resource
Departamento de Documentación y Biblioteca
RIQUIM
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Title
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<strong>Theoretical study of the microhydration of 1-chloro and 2-chloro ethanol as a clue for their relative propensity toward dehalogenation</strong>
Subject
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TERMODINAMICA
COMPUESTOS ORGANOCLORADOS
CLOROETANOL
BIBLIOGRAFIA NACIONAL QUIMICA 6530 |a 2019
2019
Abstract
A summary of the resource.
This work reports a computational analysis of hydrogen‐bonded clusters of mono‐, di‐, tri‐, and tetrahydrates of the chlorohydrins CH3CHClOH (1ClEtOH) and CH2ClCH2OH (2ClEtOH). The goal of the study is to assess the role of the water solvent into the facilitation of the initial step for dehalogenation of these compounds, a process of interest in several contexts. Molecular orbital methods (MP2), density functional methods (B3LYP, M06, and ωB97X‐D), and composite model chemistries (CBS‐QB3, G4) were employed to investigate the structure, electronic distribution, and hydrogen‐bonded structure of seven monohydrates, six dihydrates, five trihydrates, and five tetrahydrates of both species. Standard reaction enthalpy and standard Gibbs free reaction energy (urn:x-wiley:00207608:media:qua25931:qua25931-math-0001) were computed for all aggregates with respect to n independent water molecules and with respect to the dimer, trimer, and tetramer of water, respectively, in order to evaluate stability and hydrogen bonding network. The influence of the water chains on the length and vibrational frequencies, especially of the CCl and OH bonds, was evaluated. Hydrogen bonding in the complexes is discussed at length.
Creator
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<strong>Petsis, George</strong>
<strong>Salta, Zoi</strong>
<strong>Kosmas, Agnie Mylona</strong>
<a title="Curriculum Vitae" href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwjO5a_q6r_mAhX1IbkGHWsNAxYQFjAAegQIBBAH&url=https%3A%2F%2Fexportcvuy.anii.org.uy%2FCvEstatico%2F%3FurlId%3Da7868d1a46654e7a04ba7167141502086fa0cfad8b13463f75d90af715685994bc8f3eafaad6f6d2f6647277c9782143df93695c8a7d8e14295323ca2e2847d3%26formato%3Dpdf%26convocatoria%3D21&usg=AOvVaw3DgPJlf--GOsjsu4KZ-hpA" target="_self"><strong>Ventura, Oscar N.</strong></a>
Source
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International Journal of Quantum Chemistry v. 119, no. 17, 2019. -- 15p.--e25931
Publisher
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Wiley
Date
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2019
Rights
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<p><strong>Información sobre Derechos de Autor</strong></p>
<p>(Por favor lea este aviso antes de abrir los documentos u objetos)</p>
<p><strong>La legislación uruguaya protege el derecho</strong> de autor sobre toda creación literaria, científica o artística, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeción a lo establecido por el derecho común y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006)</p>
<p><strong>ADVERTENCIA -</strong> La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.</p>
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DOI: 10.1002/qua.25931
Cloroetanol
Compuestos Organoclorados
Termodinámica