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Showing 1 to 10 of 10 for “"Palladiumkomplexe"”.
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Evaluierung perfluormarkierter Katalysatoren auf fluorigem Umkehrphasen-Kieselgel
… wurden die katalytischen Eigenschaften von Palladiumkomplexen auf fluorigem Reversed-Phase-Kieselgel untersucht sowie effektive Syntheserouten zu perfluormarkierten Schlüsselbausteinen etabliert. Vorrangiges Ziel der Arbeit war, die Abtrennung perfluormarkierter Verbindungen ohne Einsatz …
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Koordinationschemie von zweikernigen Palladium(II)komplexen mit mehrzähnigen Amin-Phosphin-Thiolatliganden
… Abspaltung der S-tert-Butyl-Schutzgruppe zu Palladiumkomplexen umgesetzt, die zwei benachbarte Koordinationsstellen aufweisen. Diese sind von zwei Chloro-, einem verbrückenden Acetato- bzw. einem verbrückenden Chloro-Liganden besetzt. Die Entfernung der Chloroliganden ergab einen …
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Palladium-katalysierte enantioselektive Umlagerung allylischer O-Thiocarbamate
Enantioselective Rearrangement of Allylic Thiocarbamates The aim of the project was the examination of Palladium(0) catalyzed rearrangements of allylic thiocarbamates. Influences of the allylic moity ant the substituents at the nitrogen were investigated in respect to reactiontimes, enantio-meric …
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Vanadium-katalysierte, asymmetrische Epoxidierung von Allylalkoholen
A protocol for the vanadium-catalysed asymmetric epoxidation of allylic alcohols using enantiopure hydroxamic acids as ligands is described. The newly synthesised hydroxamic acids were derived from bicyclo[2.2.1]heptanes containing chiral centres, as well as from planar chiral [2.2]paracyclophanes …
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Palladium-katalysierte enantioselektive Synthese allylischer Thiocarboxylate und Palladium-katalysierte Deracemisierung allylischer Carbonate
The topic of this thesis is the palladium-catalyzed allylic alkylation of potassium thioacetate (KSAc) und potassium thiobenzoate (KSBz) with racemic cyclic and acyclic allylic esters having a symmetrically substituted carbon skeleton by using the Trost ligand. By this method the corresponding …
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Synthese neuer C 1-symmetrischer Monosulfoximine und deren Anwendung als Liganden in der asymmetrischen Katalyse
This PhD thesis describes the development of a new class of C1-symmetric monosulfoximines and their application as ligands in asymmetric catalysis. The main question, with which the research was concerned, is whether a ligand which does not possess C2-symmetry and has only one chiral sulfoximine …
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Palladium-katalysierte kinetische Racematspaltung allylischer Carbonate mit S-Nukleophilen und enantioselektive Umlagerung allylischer O-Sulfinate : asymmetrische Synthese von allylischern Sulfiden und Sulfonen
The palladium(0) catalyzed reactions of symmetrically disubstituted racemic allylic carbonates, being either cyclic or acyclic, with 2-pyrimidinethiol in the presence of N,N'-(1R,2R)-1,2-cyclohexanediyl-bis[2-(diphenylphosphino)-benzamide] BPA as ligand proceed with excellent levels of …
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Über die Entwicklung neuer Methoden zur N-Arylierung von Sulfoximinen und die Synthese von Diarylphosphinylsulfoximinen als Liganden in der asymmetrischen Metallkatalyse
In this work, new methods for the N-arylation of sulfoximines with various aryl sources have been developed. For the first time, aryl boronic acids can be used as aryl sources with ready available copper salts as catalysts. These cross coupling reactions can be performed under mild conditions at …
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Asymmetrische Synthese von allylischen Alkoholen mittels Palladium-katalysierter asymmetrischer Transformation von allylischen Carbonaten und Synthese neuer Sulfoximin-Phosphane
This thesis deals with two areas of study. The first part focuses on the asymmetric synthesis of synthetically interesting allylic alcohols by Palladium-catalyzed allylic substitution. For this substitution reaction the hydrogen carbonate ions are used as nucleophil and racemic allylic carbonates …