PhD defenses.

Hydrogen-Atom-Transfer Initiated Radical Bicyclizations: Concise Syntheses of Highly Oxidized Abietane Diterpenoids

Abstract: This dissertation describes the development and applications of a radical bicyclization reaction that is initiated via hydrogen-atom-transfer (HAT) to 1,1-disubstituted alkenes. In the first chapter, biomimetic radical polyene cyclizations and HAT-mediated C-C bond forming reactions are reviewed. Mechanistic and strategic aspects pertaining to radical-polar crossover are emphasized throughout, highlighting unique possibilities offered by oxidative or reductive termination.

Investigations into the Reactivity of Transition Metal Complexes with Redox-Active Ligands for Proton Coupled Electron Transfer and Nitrene Transfer

Abstract: The work presented in this dissertation centers around understanding the propensity of transition metal complexes with redox and proton non-innocent ligands to serve as proton and electron transfer agents either in proton-coupled electron transfer or group transfer reactivity.

Understanding NO3 oxidation of monoterpenes at different scales: Insights from molecular modeling, chamber experiments, and field observations

Abstract: It has been shown though numerous field studies, laboratory measurements, and the occasional modeling study that NO3 radical oxidation of monoterpenes is a significant, though often overlooked, source of secondary organic aerosol (SOA). However, this generalization is complicated by the fact that while most abundantly emitted monoterpenes (e.g. β-pinene, ∆-carene, and limonene) have moderate-to-high SOA yields with NO3 radical, the most abundantly emitted monoterpene (α-pinene) has a negligible SOA yield with NO3.

Aqueous sequestration and solid-phase separation of actinyl ions with PAMAM dendrimers

Abstract: Nuclear energy is a sustainable baseload power source with low life cycle carbon emissions, and no emissions during power plant operations. Research into new separatory schemes and technology to reprocess used nuclear fuel (UNF) can further improve carbon emissions and the efficiency of the nuclear fuel cycle. Improved aqueous separatory and extraction agents have the additional benefit of making the use of radionuclides safer with their ability to carefully segregate selected materials from environments such as natural bodies of water or waste streams.

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