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Showing 1 to 20 of 59 for “"Stille"”.
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Geräuschvolle Stille : Schallmaskierung in der Bibliothek als akustischer Kompromiss für gegensätzliche Nutzungsbedürfnisse
… monofunktionale Bild der Bibliothek als Ort der Stille löst sich zugunsten individuell an die Nutzer*innen angepasste Lern- und Arbeitsumgebungen auf. Es entsteht ein Kaleidoskop bunt gemischter Nutzungsmuster, jedes mit ganz eigener Geräuschkulisse und Anforderung an die Akustik. Die …
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Edle Einfalt, stille Größe. Winckelmann und seine Rezeption durch Schiller und Goethe
<p>Die Arbeit befasst sich mit der Ästhetischen Theoriebildung der Weimarer Klassik auf der Grundlage der Rezeption der Winckelmannschen Werke durch Goethe und Schiller.</p>
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The Modified Stereospecific Stille Reaction: Palladium-Catalyzed Cross-Coupling Reactions Involving Secondary and Tertiary Alkyl Carbastannatranes
… cross-coupling reactions (especially Stille and Suzuki cross coupling reactions) can tolerate a broad scope of reactants, and even proceed with high stereospecificity. The development of a general system that enables a broad scope of reactants to be employed in reactions with high …
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Advances in the Stille reaction and new methods for continuous flow Pd-catalyzed C-N bond forming reactions
… ligand, XPhos, for the palladium-catalyzed Stille reaction has been developed. This method allows for the coupling of aryl chlorides with a range of tributylarylstannanes to produce the corresponding biaryl compounds in good to excellent yields (61-98%) in short reaction times (4 h). …
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Pyrrolo[2,3-d]pyrimidine-based π-conjugated fluorophores with 1,2,3-triazole and ethynyl linkers: synthesis and photophysical properties /
… 650 nm. A comparative study of Sonogashira and Stille reactions as well as Suzuki and Stille reactions for the introduction of alkynyl and aryl moieties onto pyrrolo[2,3-d]pyrimidine has been carried out. The synthesis of pyrrolo[2,3-d]pyrimidine oligoarylenes bearing different alkynyl and aryl …
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Pirolo[2,3-d]pirimidino π-konjuguotų fluoroforų, turinčių 1,2,3-triazolo ir etinil jungtukus, sintezė ir fotofizikinės savybės /
… 650 nm. A comparative study of Sonogashira and Stille reactions as well as Suzuki and Stille reactions for the introduction of alkynyl and aryl moieties onto pyrrolo[2,3-d]pyrimidine has been carried out. The synthesis of pyrrolo[2,3-d]pyrimidine oligoarylenes bearing different alkynyl and aryl …
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C2- and C3-Symmetric Meta-substituted Thienyl Benzenes: A Comparative Synthetic and Structural Study
Suzuki, Stille and Kumada coupling approaches to the syntheses of various C1- and C3- symmetric thienylbenzene compounds (A and B, respectively) are systematically compared. Novel routes are reported for the syntheses of C3-symmetric compounds using Kumada (n = 0) and Stille (n = 1) coupling …
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Synthesis of Crowded Tolanes: Models for Molecular Recognition
… intramolecular noncovalent interactions. The Stille cross-coupling reaction allowed synthesis of both arylacetylenes and tolanes from aryl iodides. The Stille reaction is usually slow for electron rich aryl iodides (such as these aryl iodides that are substituted resorcinol derivatives). …
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Oscar Romero: eingebunden: zwischen Tod und Leben ; 15 Jahre Oscar-Romero-Stiftung in Oldenburg ; Texte und Dokumente zu Oscar Romero und zum Raum der Stille im Oscar-Romero-Haus in Oldenburg
… und künstlerischer Ausgestaltung des Raumes der Stille zusammenfließen und die Spiritualität Romeros aufgreifen. Thomas Sternberg und Iris Gniosdorsch beschreiben die geschlossene theologische Raumkonzeption mit Mitteln der Kunst durch Klaus Simon. In den Augen vor Heinrich Timmerevers will der …
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De benoeming van een beoogd curator
… vooraf gaat aan een dreigend faillissment (“de stille voorbereidingsfase”). In deze scriptie komen eerst de taken, bevoegdheden, en aansprakelijkheid van de beoogd curator in de huidige praktijk aan de orde. Vervolgens bespreek ik het wetsvoorstel Wet continuïteit ondernemingen I. Tenslotte kom …
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Synthesis of Biologically Active Tropolones and Stereochemically Rich Compounds via Cross-Coupling Reactions
… cross-coupling reactions such as Suzuki and Stille reactions. The Stille reaction is a chemical reaction that involves the use of organotin compounds with a variety of electrophiles. Stereospecific transfer of chirality using configurationally stable enantioenriched carbastannatranes, as the …
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Palladium -catalyzed synthesis of carbazole derivatives and formal total syntheses of several naturally occurring carbazole alkaloids
… palladium-catalyzed reactions, an intermolecular Stille coupling followed by an intramolecular reductive N-heteroannulation. For example, 1,2-dihydro-4(3H)-carbazolone was prepared in good isolated yield (74%) by the reductive cyclization of 2-(2-nitrophenyl)-2-cyclohexen-1-one using Pd(dba)2 (6 …
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Thiophen und Benzodithiophen basierte organische Halbleiter für aus Lösung prozessierbare Feldeffekttransistoren
… und Distannylmonomere. Zunächst werden über die Stille-Reaktion alternierende Copolymere mit alkylierten Fluoren- und Chinoxalin-Einheiten realisiert. Alle Copolymere zeichnen sich durch eine gute Löslichkeit in gängigen organischen Lösungsmitteln, hohe thermische Stabilität und durch gute …
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A base modulated synthesis of indoles and quinolines, an expedient synthesis of salviadione, and chemoselective couplings en route to indoles and pyrroloindoles
… of chemoselectivity in Kosugi-Migita-Stille coupling reactions provided the basis for the synthesis of isomeric pyrroloindoles through palladium-catalyzed reductive double N-heteroannulation of dinitro-dialkenyl benzenes.
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Access to modified geiparvarins using Pd(0)-mediated C-C bond forming reactions
… involving both Suzuki–Miyura and Stille reactions, using the appropriate intermediate iodides and bromides, is described. The application of Stille and Heck conditions to give 3″-ethenylgeiparvarin analogues and Sonogashira conditions to produce 3″-ethynylgeiparvarin analogues, …
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Synthesis of unnatural analogues of narciclasine: Chemoenzymatic synthesis of 2-epi-1-hydroxymethylnarciclasine
… on chemoenzymatic dihydroxylation of an arene, Stille coupling, and an intramolecular Heck reaction to affect key transformations. The synthesis of the targeted C-1 analogues addresses a gap in literature where few narciclasine analogues have been prepared, with no C-1 homologues existing to …
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Synthesis and reactivity of alpha-thio-beta-chloroacrylamides and alpha-thio-beta-chloroenones
… included nucleophilic additions and Stille cross-coupling at the β-carbon. Chapter 1 reviews the literature relevant to the research conducted, and focuses in particular on the synthesis of β-chloroenones and related unsaturated carbonyl compounds. The synthesis of chalcone compounds …
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Novel synthetic methodology employing organosulfur chemistry in the synthesis of chalcone derivatives
… dienophiles, and dipolarophiles, and can undergo Stille coupling making them highly versatile synthetic intermediates. They can also undergo sulfur oxidation enabling further functionalisation. The first chapter is a literature review of Stille coupling involving b-haloenone systems, including …
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Studies Towards the Total Synthesis of the Chivosazoles
… Mukaiyama aldol reaction. Site-selective Stille cross-coupling reactions of the three fragments, via a one-pot process, rapidly installed the requisite stereodefined polyene motifs within chivosazole F. Optimised Still-Gennari-type HWE olefination conditions were applied to install the …
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