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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 75 for “"photoredox"”.
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Towards Photoredox-Cleavable Prodrugs
… With the increasing popularity of visible-light photoredox chemistry in organic synthesis, there is an increasing number of photosensitiser-mediated reactions being reported, which can also be applied to photouncaging. For this project it was envisaged that a photooxidative approach would be …
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Greener Photoredox-Catalyzed Phosphonations of Aryl Halides
… and low functional group compatibility. Photoredox catalysis has been significantly advanced in the past decade in the pursuit of greener, more sustainable avenues to facilitate desirable reaction transformations under mild conditions. These methods most commonly use a dual catalytic …
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Metal-Free Photoredox-Mediated Ring Opening Metathesis Polymerization
Metal-free, photoredox-mediated ring-opening metathesis polymerization (MF-ROMP) is a novel approach to the synthesis of ROMP polymers. Whereas traditional, metal-mediated ROMP uses well-defined transition metal-alkylidene initiators in stoichiometric amounts, MF-ROMP uses a photo-oxidant to …
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Photoredox Generated Radicals In Csp2-Csp3 Bond Construction
… time. In summary, the synergistic use of an Ir photoredox catalyst and a Ni cross-coupling catalyst to mediate the cross-coupling of (hetero)aryl bromides with diverse alkyl radical precursors will be discussed. Methods for coupling various trifluoroborate classes (α-alkoxy, α-trifluoromethyl, …
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Development and optimization of photoredox-mediated methine epimerization
Reactions that edit the stereochemistry of individual atoms are enabling tools in synthetic chemistry. The Wendlandt lab has developed a sequential H-atom abstraction and donation strategy to synthesize rare sugars from biomass platform molecules such as D-glucose. Efforts to apply this strategy to …
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Excited-state organic chemistry: Tuning photoprotective and photoredox properties
… of photochemistry: photoprotection and photoredox catalysis. In the context of photoprotection, the synthesis, characterization and study of the properties of new photoprotective molecules against solar radiation are presented. Additionally, mechanistic investigations of photoredox …
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The application of colloidal photocatalysis in actinide photoredox chemistry
Colloidal semiconductor particles may act as efficient photocatalysts for a range of environmentally usellil reactions such as pollution abatement and nitrogen fixation. The primary step in these reactions is the absorption of ultra-band gap energy photons by the particles, which generates …
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Accessing Challenging Fluorinated Motifs Using Photoredox Catalysis And Enabling Technologies
… functionalization of complex molecules. Photoredox catalysis invites a paradigm shift in the understanding of our capabilities to access diverse gem-difluoroalkene-containing small molecules because of its characteristically mild reaction conditions. Net-neutral radical/polar crossover, a …
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Applications of Cobaloxime/Photoredox Co-operative Catalysis Toward Olefin Functionalization
… the development and applications of cobaloxime/photoredox co-operative catalysis for olefin functionalization reactions is described. The primary focus has been to devise strategies that allow for the chemoselective cross-coupling of olefins with a variety of versatile functional groups toward …
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Development of New Organic Photoredox Catalysis Driven by Visible Light
… less susceptible to air and moisture. Organophotoredox catalysis has merged as a front runner in organocatalysis. My Ph.D. study focuses on the development of novel visible-light mediated organic photoredox catalysis strategies for the construction of structurally diverse molecular …
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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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Iridium (III) photosensitisers for photoredox catalysed carboxylation reactions of ketimines
… energy to initiate chemical reactions. Photoredox catalysis has piqued great interest in this regard, creating a means for a milder energy source (visible light) to drive chemical reactions and thus revolutionising the field of synthetic radical chemistry and photochemistry. Recently, …
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Photoredox activation of carbon dioxide and unactivated aliphatic carbonyl compounds
Chapter 1: Photoredox Activation of Carbon Dioxide for Amino Acid Synthesis in Continuous Flow. Although carbon dioxide (CO₂ ) is highly abundant, its low reactivity has limited its use in chemical synthesis. In particular, methods for carbon-carbon bond formation generally rely on two-electron …
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The application of iron oxide based photocatalysts in chromium photoredox chemistry
Chromium(VI) is a reactive and highly toxic pollutant species which is present in certain industrial effluent streams as well as sea water and polluted ground water. Chromium(III), however, is relatively inert and less toxic. Conventional methods used to eliminate Cr(VI) from aqueous phase include …
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Chloro-arylation of Alkenes via Cooperative Photoredox and Atom-transfer Catalysis
Alkyl chlorides represent one of the most widely applicable synthetic intermediates in organic chemistry due to their multi-dimensional reactivities. This thesis primarily focused on the development of a photocatalytic, aryl radical mediated chloro-arylation reaction of alkenes. The goal was to …
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Iron-catalyzed C—H alkylation and photoredox frontal ring opening metathesis polymerization
Metal alkylidenes are versatile synthetic intermediates which have revolutionized multiple chemical fields. They have been used in the synthesis of countless natural products, drugs, and polymers and have contributed to a different understanding of the chemistry of carbon. This thesis deals with …
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Harnessing the Reactivity of Sulfamate Esters and Sulfamides in Photoredox-Mediated Bond-Forming Reactions
… at one C–H bond in preference to others. Photoredox-catalyzed platforms have enabled the controlled access to reactive radical intermediates capable of acting as directing groups for the transformation of unreactive C–H bonds under mild conditions.</p><p>In addition to allowing access to …
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Synthesis and characterisation of small molecule and macromolecular photoredox catalysts for radical thiol-ene reactions
… aim to improve the reactivity and stability of photoredox catalysts, multinuclear photoredox catalysts were developed. Consequently, bipyridyl monomeric and trimeric ligands functionalised with imine and amine functionalities were synthesised via Schiff base condensation and reductive amination …
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Mechanistic Studies and Rational Catalyst Design of Nickel/Photoredox Dual-Catalyzed C–C Cross-Coupling Reactions
The merging of photoredox and nickel catalysis has revolutionized the field of C–C cross-coupling. However, in comparison to the development of synthetic methods, detailed mechanistic investigations of these catalytic systems are lagging. In this vein, computational tools have been applied to …
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