Bibliografías temáticas / Chlorosulfonique

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Literatura académica sobre el tema "Chlorosulfonique"

Autor: Grafiati

Publicado: 20 de abril de 2024

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Artículos de revistas sobre el tema "Chlorosulfonique"

Potvin, Michael, Belquis Mothana, Laura Albrecht, Katherine Valenta Darvesh y Richard F. Langler. "The Role of Ylides in the Chlorination of Unsymmetrical Sulfides: An Ab Initio Molecular Orbital Study". Australian Journal of Chemistry 58, n.º 2 (2005): 143. http://dx.doi.org/10.1071/ch03219.

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Ab initio molecular orbital theory has been used to investigate a series of possible chlorosulfonium ylides to assess the potential for ylide intermediacy in the chlorination of organic sulfides. The majority of optimized structures are best viewed as thionium salts. Only ylide structures in which the putative carbanionic centre bears a powerful anion stabilizer (e.g. cyano or carbomethoxy) survive optimization.

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Minkwitz, Rolf, Andreas Kornath y Hans Preut. "Notizen: Über die Kristallstruktur von β-SCl3+SbCl6- und interionischen Wechselwirkungen in SCl3+-Salzen/The Crystal Structure of β-SCl3+SbCl6- and Interionic Interactions in SCl3+ Salts". Zeitschrift für Naturforschung B 47, n.º 4 (1 de abril de 1992): 594–96. http://dx.doi.org/10.1515/znb-1992-0423.

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Chlorosulfonium hexachloroantimonate crystallizes in the monoclinic space group C 2/m with a = 1405.5(3) pm, b = 1055.1(2) pm , c = 882.2(2) pm, β = 110.05(3)° at 169 K with 4 formula units per unit cell. A distorted octahedral coordination around sulphur is formed by three S - C l bonds and three interionic sulphur chlorine contacts. The interionic interactions in SCl3+ salts of known crystal structures are discussed.

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Acosta‐Guzmán, Paola, Camilo Mahecha‐Mahecha y Diego Gamba‐Sánchez. "Electrophilic Chlorine from Chlorosulfonium Salts: A Highly Chemoselective Reduction of Sulfoxides". Chemistry – A European Journal 26, n.º 45 (10 de julio de 2020): 10348–54. http://dx.doi.org/10.1002/chem.202001815.

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Ginsburg, Jack Leon, Katherine Valenta Darvesh, Patricia Axworthy y Richard Francis Langler. "An Ab Initio Molecular Orbital Study of Sulfur-Substituted Carbanions: Toward an Understanding of Regiochemistry in the Chlorination of Unsymmetrical Sulfides". Australian Journal of Chemistry 50, n.º 6 (1997): 517. http://dx.doi.org/10.1071/c96187.

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Moller-Plesset molecular orbital calculations at the 6-31+G(d) level have been completed on substituted dimethyl sulfide-derived carbanions. The results are applied to the prediction of regiochemistry for chlorination of unsymmetrical sulfides. Notwithstanding the need for future improvements, regiochemical predictions based on stabilities of sulfur-substituted carbanions match experimental results better than earlier predictions based on stabilities of sulfur-substituted carbonium ions or sulfur-substituted free radicals. The present results suggest that the mechanism for the elimination step in the Pummerer rearrangement of a chlorosulfonium cation is an E 1cb-like process.

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Adarve-Cardona, Laura y Diego Gamba-Sánchez. "Reduction of Sulfoxides in Multigram Scale, an Alternative to the Use of Chlorinated Solvents". Processes 10, n.º 6 (2 de junio de 2022): 1115. http://dx.doi.org/10.3390/pr10061115.

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In this manuscript, we describe the use of ethyl vinyl ether/oxalyl chloride as the reducing mixture for sulfoxides. The reaction is based on the high electrophilic character of chlorosulfonium salts, formed in situ by the reaction of oxalyl chloride and the sulfoxide. Thereafter, the nucleophilic vinyl ether acts as a chlorine scavenger, affording the corresponding sulfide. The method is applicable on a big scale and may be applied to highly functionalized sulfoxides. Chromatographic purification is only needed in exceptional cases of unstable substrates, and the final sulfide or the corresponding salt is usually obtained after simple evaporation of volatiles. The sole contaminants of this method are carbon dioxide, carbon monoxide and small (five-carbon maximum) aldol products, which are formed during the reaction process.

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Fujihara, Hisashi, Ryouichi Akaishi y Naomichi Furukawa. "Formation of Chlorosulfonium Salt of 1,5-Dithiacyclooctane and Transannular Sulfur–Sulfur Interaction in Hydrolysis of Its Salt". Bulletin of the Chemical Society of Japan 60, n.º 12 (diciembre de 1987): 4451–52. http://dx.doi.org/10.1246/bcsj.60.4451.

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Garay-Talero, Alexander, Paola Acosta-Guzmán y Diego Gamba-Sánchez. "Regioselective Organocatalyzed Monochlorination of Arenes with Electrophilic Chlorosulfoniums". Advanced Synthesis & Catalysis, 20 de noviembre de 2023. http://dx.doi.org/10.1002/adsc.202300971.

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This manuscript presents a regioselective chlorination of arenes, yielding almost exclusively the monochlorinated product. It tolerates free hydroxy groups, 1º, 2º and 3º amines, and carboxylic acids, among other polar and nonpolar functional groups, as well as mono‐ and polysubstituted aromatic rings. Additionally, the utilization of chlorosulfonium salts as the chlorinating agent is demonstrated. The method emerges as an alternative to other processes where organic byproducts must be separated from the reaction mixture. In addition, the main byproducts are gaseous materials such as CO and CO2. This publication introduces the application of sulfoxides, oxalyl chloride, and aqueous hydrogen peroxide as the chlorination mixture.

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Ruff, Ferenc, Dénes Szabó, József Rábai, István Jalsovszky y Ödön Farkas. "Mechanism for the reactions of sulfides with hypochlorous acid and N ‐chlorosulfon‐amides: Formation of solvated chlorosulfonium cation and λ 4 ‐sulfane intermediates". Journal of Physical Organic Chemistry 32, n.º 11 (11 de agosto de 2019). http://dx.doi.org/10.1002/poc.4005.

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Tesis sobre el tema "Chlorosulfonique"

Martin, Amélie. "Sulfonation du polyfluorure de vinylidène (PVDF) : Analyse structurale par RMN multinoyaux {1H, 13C, 19F}". Electronic Thesis or Diss., Normandie, 2022. http://www.theses.fr/2022NORMR117.

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Ce travail de thèse a pour objectifs de comprendre le processus de sulfonation du PVDF par l’acide chlorosulfonique et ceci afin de pouvoir préparer des membranes polymères avec un degré de sulfonation optimal pour une utilisation en PEMFC.Dans une première partie, l’influence de la température, la durée de la réaction et la concentration en acide sur la sulfonation a été évaluée. Les données obtenues par IRTF, AE, ATG, ACD et RMN ont permis de comprendre le mécanisme de sulfonation et de montrer que la déhydrofluoration est un préalable nécessaire et indispensable à la sulfonation de la chaine du PVDF.Dans une deuxième partie, nous avons initié la déhydrofluoration du PVDF (d_PVDF) par une base forte, la DBU, et réalisé la sulfonation des produits déhydrofluorés (S_d_PVDF). Les produits obtenus ont été analysés par IRTF, AE, ATG, ACD et RMN en phase solide et nous avons mis en lien les changements de mobilité des chaînes dus à la sulfonation et les propriétés physico-chimiques des polymères
The aim of the present work was to understand the sulfonation process of PVDF by chlorosulfonic acid in order to obtain polymer membranes with an optimal sulfonation degree for their further use in PEMFC.At the beginning, the influence of temperature, reaction time and acid concentration on sulfonation was evaluated. The data obtained by FTIR, EA, TGA, DSC and NMR analysis made it possible to reveal the sulfonation mechanism and to show that dehydrofluorination is a necessary and essential condition for the PVDF sulfonation.Taking this to account, the dehydrofluorination of PVDF (d_PVDF) by a strong base, DBU, was initiated and the sulfonation was carried out for the dehydrofluorinated products (S_d_PVDF). The products obtained were analyzed by FTIR, EA, TGA, DSC and NMR in solid-state and the changes in chain mobility due to the sulfonation were correlated with the polymer physico-chemical properties

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