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Auswahl der wissenschaftlichen Literatur zum Thema „Phosphiranium salts“
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Zeitschriftenartikel zum Thema "Phosphiranium salts"
Dalla, Vincent, Catherine Taillier, Julien Gasnot, Clément Botella, Sébastien Comesse, Sami Lakhdar, Carole Alayrac und Annie-Claude Gaumont. „Access to Stable Quaternary Phosphiranium Salts by P-Alkylation and P-Arylation of Phosphiranes“. Synlett 31, Nr. 09 (12.03.2020): 883–88. http://dx.doi.org/10.1055/s-0040-1708000.
Der volle Inhalt der QuelleHockless, David C. R., Mark A. McDonald, Michael Pabel und S. Bruce Wild. „Facile syntheses and interconversions between simple phosphiranium and phosphirenium salts“. Journal of Organometallic Chemistry 529, Nr. 1-2 (Februar 1997): 189–96. http://dx.doi.org/10.1016/s0022-328x(96)06641-7.
Der volle Inhalt der QuelleHOCKLESS, D. C. R., M. A. MCDONALD, M. PABEL und S. B. WILD. „ChemInform Abstract: Facile Syntheses and Interconversions Between Simple Phosphiranium and Phosphirenium Salts.“ ChemInform 28, Nr. 36 (03.08.2010): no. http://dx.doi.org/10.1002/chin.199736196.
Der volle Inhalt der QuelleGasnot, Julien, Clément Botella, Sébastien Comesse, Sami Lakhdar, Carole Alayrac, Annie‐Claude Gaumont, Vincent Dalla und Catherine Taillier. „Taming the Reactivity of Phosphiranium Salts: Site‐Selective C‐Centered Ring Opening for Direct Synthesis of Phosphinoethylamines“. Angewandte Chemie 132, Nr. 29 (18.05.2020): 11867–71. http://dx.doi.org/10.1002/ange.201916449.
Der volle Inhalt der QuelleGasnot, Julien, Clément Botella, Sébastien Comesse, Sami Lakhdar, Carole Alayrac, Annie‐Claude Gaumont, Vincent Dalla und Catherine Taillier. „Taming the Reactivity of Phosphiranium Salts: Site‐Selective C‐Centered Ring Opening for Direct Synthesis of Phosphinoethylamines“. Angewandte Chemie International Edition 59, Nr. 29 (18.05.2020): 11769–73. http://dx.doi.org/10.1002/anie.201916449.
Der volle Inhalt der QuelleDissertationen zum Thema "Phosphiranium salts"
Bellanger, Corentin. „Formation et rupture de liaisons chimiques par action de la lumière visible : synthèse et études mécanistiques“. Electronic Thesis or Diss., Toulouse 3, 2023. http://www.theses.fr/2023TOU30155.
Der volle Inhalt der QuelleThis manuscript, entitled "Making and breaking bonds with visible light: Synthesis and mechanisms", covers the development of new synthetic procedures and their mechanistic investigations. It is divided into five chapters. The first chapter is a general introduction on the definition of visible-light and the history of photochemistry. Chapter II discloses the progress made in the challenging quaternarization of phosphiranes and the C-centered ring opening of phosphiranium salts. Extensive knowledge of the phosphorus-containing three-membered rings reactivity, namely phosphirane and phosphiranium salts, is lacking. We show that the formation of free electrophilic carbenes by visible-light irradiation of the corresponding aryldiazoacetates and their reactivity with 1-mesitylphosphirane allows the formation of phosphiranium ylides. The reactivity of the previously unknown phosphiranium ylides is explored in the presence of pronucleophiles bearing an acidic hydrogen to provide the selective carbon centered ring opening products by efficient ring strain release. Thiophenols and carboxylic acids were successfully used as reaction partners and afforded a wide scope with good yields and moderate diastereoselectivities. The experimental methodology was optimized to allow isolation and characterization of the products by oxidizing the phosphine resulting from the ring opening to a phosphine oxide. This study is finally complemented by DFT calculations to support a reasonable reaction mechanism. A pathway in good agreement with experimental observations was calculated and showed the importance of the ring strain release as the driving force of the reaction. Chapter III focuses on donor-acceptor cyanoarenes, which are widely used photocatalysts in photoredox catalysis. Examples from the literature showing the super-reducing abilities of cyanoarenes radical anions to reduce aryl chlorides are discussed in the literature. However, the use of amines as sacrificial electron donors is not chemically innocent and further investigations were required. One way to complement this study is by electrochemically reducing the cyanoarenes. In chapter III, we show that the electrochemical generation of donor-acceptor cyanoarenes' radical anion is a clean and efficient method. The study of their photophysical properties in the presence and absence of chlorobenzene provided different results compared to a previous literature report and add more data to the current debate on the ability of radical anions to act as super-reducing agents. Part of this chapter is devoted to the study of the interaction between the strong Lewis acid B(C6F5)3 and donor-acceptor cyanoarenes. The coordination induces important structural and photophysical modifications. An electrochemical study shows that the coordination of the reduced cyanoarene to the same Lewis acid is favored but that the resulting adduct is unstable and leads to the decomposition of the Lewis acid. Chapter IV addresses the challenging cleavage of the fluorine-carbon bond in aryl fluorides. If these molecules are successfully provided an extra electron by electron transfer, the carbon-fluorine bond is known to be able to dissociate to provide the fluoride anion as well as the corresponding aryl radical. This step requires strong reducing agents, and only few of them are reported in the literature. The visible light-mediated germanylation of aryl fluorides is reported with a particular focus on the super-reducing properties of the triphenylgermanyl anion's excited state. By simply combining readily available fluoro-arenes with germanes in the presence of a base and under blue irradiation, tetraarylgermanes were synthesized in reasonable to good yield. Experimental and theoretical investigations have been undertaken and a reasonable reaction mechanism is discussed. Finally, chapter V gives a general conclusion to the manuscript by summarizing the different results obtained and the outlooks for each chapter