Global ETD Search
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Showing 1 to 8 of 8 for “"Chiral Cation"”.
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The Development of Enantioselective Rhodium-Catalysed Aziridination Reactions Directed by a Chiral Cation
Aziridines are versatile precursors to prepare chiral nitrogen-containing compounds. Whilst great advances have been developed in asymmetric intermolecular aziridination, there remain significant gaps in the scope of alkenes that can be accommodated with present protocols. Chapter 2 discusses the …
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Utilising Non-Covalent Interactions in Developing Enantioselective Radical Transformations
… The first research chapter describes the use of chiral phosphoric acids to control the enantioselectivity in the reactions of α-amino radicals. Firstly, a Giese reaction with α,β-unsaturated carbonyls is reported. This was found to be successful for a range of substrates, with the catalyst being …
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Investigations of Catalysts Which Utilise Non-Covalent Interactions to Control Enantioselectivity in Rhodium-Catalysed Amination of C(sp3)–H Bonds
… prior by Dr. Alex Fanourakis, and their application towards substrate-directed amination of aryl alcohols via a key alcohol-sulfonate hydrogen bond was already underway; the first section of this thesis describes the author’s contributions to this work, collaborating closely with Dr. Alex …
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The Development of Asymmetric Palladium-Catalysed Transformations Using Chiral Sulfonated Phosphine Ligands
… phosphine ligands. Firstly, a library of achiral sulfonated phosphine ligands that are ion-paired with a chiral cation were synthesised. These ligands only had modest success in a selection of transition metal- catalysed processes evaluated, but encouraging results were obtained for the …
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Iridium Catalysed Borylation as a Platform for Exploring the Use of Non-Covalent Interactions to Control Regio- and Enantioselectivity
… bipyridine scaffold with the introduction of a chiral counter-cation. The approach allows for the formation of a chiral environment around the metal centre via a chiral counter-ion directed catalysis and was demonstrated on the example of desymmetrising iridium catalysed borylation of arenes. …
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Controlling the Regio- and Enantioselectivity of Iridium-Catalysed Arene Borylation Using Sulfonated Bipyridine Ligands
… moderate. Despite their often-privileged nature, chiral cations have generally found limited use in transition metal catalysis. The second part of this thesis explores a strategy in which a chiral cation, derived from the privileged class of cinchona alkaloids, is associated with an anionic …
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The Application and Evolution of Chiral Ion-Paired Rhodium(II,II) Tetracarboxylate Catalysts for Enantioselective Nitrene Transfer
… nitrene transfer chemistry employing chiral ion-paired dirhodium catalysts. The initial development of this catalyst family was reported previously by the Phipps group and their design is based on a strategy for the combination of transition metal complexes and cinchona …
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Control of chiral optical and spin properties in low-dimensional perovskites
… geometric tolerance factors to small monovalent cations and a limited set of simple organic molecules, 2D perovskites can accommodate large organic spacer cations between inorganic layers, enabling diverse organic cations incorporation. This expanded molecular design allows the introduction of …