Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 663 for “"C/C"”.
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Palladium-catalyzed C-C, C-N and C-O bond formation
New methods for Pd-catalyzed cross-coupling reactions of aryl halides or arenesulfonates are described. Key to the success of these transformations is the proper choice of ligand and reaction conditions. Palladium catalysts supported by bulky, monodentate phosphine ligands with a biaryl backbone or …
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Metallodendrimers as catalysts for C-C coupling reactions
In this work, we describe the synthesis of ferrocenylimine and G1 dendrimeric N,N′ ligands, and their palladium(II) complexes. The ligands L1 – L4 were synthesized following Schiff base condensation reactions. The ferrocenylimine ligands L1 and L2 were prepared from ferrocenecarboxaldehyde and …
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Asymmetrische C-C-Knüpfungsreaktionen mit lithiierten Alkyl- und Allylsulfoximinen
Asymmetric C–C–bonding reactions with lithiated alkyl and allyl sulfoximines This thesis deals with the use of (S)-N,S-dimethylphenylsulfoximine in asymmetric synthesis. The lithiated (S)-N,S-dimethylphenylsulfoximine can react with alpha-, beta-unsaturated carbon acid esters. This Michael-type …
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Ruthenium-Thioaldehyd-Komplexe: Synthese, Struktur und C-C-Verknüpfungsreaktionen
No abstract available
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Hybrid Static/Dynamic Type Safety for C/C++ Programs
C/C++ are the languages of choice for development of many widely used system softwares. However, these languages do not provide the strong safety guarantees that safe languages such as Java do. Programming mistakes can introduce type errors that are not caught at compile time. These errors may …
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Photoredox C–C Cross-Coupling Reactions using Boronic Acid Derivatives
In recent years, photoredox catalysis emerged as a privileged tool for small molecules activation via single-electron transfer mechanisms. Despite their ubiquity as reagents in organic synthesis, the use of boronic acid derivatives to generate carbon-centred radicals remains elusive. This …
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Transition metal-facilitated C-C and C-F bond forming
Chapter 1. Copper-Catalyzed Asymmetric Addition of Olefin-Derived Nucleophiles to Ketones A copper (I) catalyzed coupling olefins and ketones has been developed for the diastereo- and enantioselective generation of homopropargyl alcohols bearing vicinal stereocenters. This method allows for the …
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Beiträge zur Addition von Stickstoff- und Kohlenstoffnucleophilen an C-C-Doppelbindungen
The thesis at hand deals with the topic of palladium catalysts for the addition of nucelophiles to conjugated double bonds. The objective was the development of new ligands for the hydroamination of dienes and the creation of catalysts for homologous compounds. According to a model of the …
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Quinone-Catalyzed Amine α-C–H and α-C–C Functionalization
Amines are extremely useful compounds with diverse applications in multiple disciplines. For this reason, a myriad of synthetic methods has been developed for the preparation of amine compounds. Despite this, the majority of well-established methodology for amine synthesis relies on the …
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Pharmacological insights into C-‐C motif chemokine receptor 5 mediated chemotaxis
Aim: Despite being well validated as a therapeutic target, no chemokine receptor antagonists to be used as therapeutic agents in inflammatory or metastatic disease have made it to market. This is in part due to receptor redundancy, but also a lack of understanding with regard to cytoplasmic signal …
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Studies in Selective C-C Bond Formation via Borylation and Dehydrogenation
Three stories of C-C bond formation are presented. First, we attempt to harness the Lewis acidity of boron to induce chemo- and regioselectivity in two fundamental organic reactions (Chapter 1). We explore 1,2-difunctionalization of alkenes via formation of a three-membered cyclic intermediate with …
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Metallierung, oxidative C-C-Kupplung und C-N-Aktivierung mit Zinkorganyl-Verbindungen
Ein Ziel dieser Arbeit war es, die Zugänglichkeit von geminalen Bis(alkylzink)imiden zu untersuchen. Verbindungen des Typs (RZn)2NR´ wurden bereits in der Literatur[33][34] als Polymerisationskatalysator erwähnt, jedoch nicht strukturell erfasst. In Kapitel 2.1 ist die Zinkierung primärer Amine mit …
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mVizion: taking a closer look at memory utilization in C/C++ programs
Computer system performance depends on the efficiency and precision of all of its components. When it comes to software, the primary goal is to ensure the most effective use of the hardware resources while maintaining the accuracy of the computations being handled. While many software developers …
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Photochemical Methods for the Construction of C-C and C-X Bonds
This thesis encompasses photochemical methods for the construction of C-C and C-X bonds. Following an introduction on the challenges with photochemistry, early work in photoredox catalysis and the application of continuous processing for photochemical reactions are three research chapters. Chapter …
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Late transition metal catalyzed C-N and C-C bond forming reactions
New methods for the palladium-catalyzed amination of aryl halides are described. Key to these is the development of new catalysts and reaction conditions for these transformations. Initially, P(o-tol)3 ligated palladium catalysts were investigated but gave way to systems that used chelating …
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