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 9 of 9 for “"anionic ligand"”.
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Utilising Non-Covalent Interactions in Developing Enantioselective Radical Transformations
… The subsequent approach relied on using an anionic ligand, ion-paired to a chiral cation derived from cinchona alkaloids, to create a chiral environment around the metal centre. The challenges encountered for both approaches are discussed. The third research chapter describes the incipient …
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Control of selectivity in palladium-catalysed cross-coupling reactions using a sulfonated phosphine ligand
… members of the privileged dialkylbiarylphosphine ligand class, specifically sSPhos, which is the commercially available sulfonated variant of SPhos. The first part investigates the use of this ligand to impart site-selectivity in the cross-coupling of 3,4-dichloroarenes containing an acidic …
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Controlling Site-Selectivity in Palladium-Catalysed Cross-Coupling Reactions using Non-Covalent Interactions Between Ligand and Substrate
… by using a non-covalent interaction between a ligand and substrate. A library of phosphine ligands were synthesised that incorporate an anionic or hydrogen bond acceptor group. They were first evaluated in the Mizoroki-Heck reaction with alkenes that bear a complementary hydrogen bond donor …
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Structures of Werner clathrates
… is predominantly devoted to the 4-phenylpyridine ligand and the role that it plays in the formation of a series of inorganic coordination complexes termed Werner Clathrates. The synthesis and characterization by single crystal X-ray diffraction techniques are reported for 18 structures, the …
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Development of Ion Pairing Strategies that Utilise Cations to Control Selectivity in Transition Metal-Catalysed Functionalisation of C–H Bonds
… interaction between a cationic substrate and an anionic ligand to favour meta-selective borylation. Building upon this work, Chapter 2.2 explores whether selective borylation may still be achieved when inverting the polarity of the substrate–ligand interaction. Disappointingly, the cationic …
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ANION EFFECTS IN HOMOGENOUS PALLADIUM CATALYSIS AND LUMINESCENT PROPERTIES OF COPPER(I) COMPLEXES BEARING A WEAKLY-COORDINATING ANIONIC N-HETEROCYCLIC CARBENE LIGAND
… dissertation concerns how the locality of an anionic moiety, be it a weakly coordinating anion or an anionic ligand, affect the spectroscopic and structural properties of organotransition metal complexes. Probing the columbic interactions between traditional and novel weakly coordinating …
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Catalytic C-H oxidation reactions for the synthesis and diversification of hydroxyamino acid motifs
… π-allylPd intermediate, including serving as an anionic ligand to palladium capable of performing allylic C-H cleavage. Natural products of nonribosomal peptide synthetase (NRPS) origin posses complex topologies and diverse functional group arrays that lead to varied and impressive therapeutic …
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Design of New, More Stable, Precursors to Organopalladium(II) Complexes and Methods for the Palladium-Mediated Late-Stage Diversification of Pharmaceuticals
… of the natural product k252a. Chapter 2. A Ligand Exchange Process for the Diversification of Palladium Oxidative Addition Complexes Palladium oxidative addition complexes (OACs) have recently emerged as powerful tools to enable challenging bond formations for the functionalization and …
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Investigations into cyclopropanation and ethylene polymerization via salicylaldiminato copper (II) complexes
… little relates the two chapters apart from the ligands. The first chapter addresses diastereoselective homogeneous copper catalyzed cyclopropanation reactions. Cyclopropanation of styrene and ethyl diazoacetate (EDA) is a standard test reaction for homogeneous catalysts. Sterically bulky …