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 43 for “"radical reactions"”.
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Free radical reactions of allylic and propargylic derivatives
<p>Addition of tert-butyl radical, generated from t-BuHgCl, to allyl or propargyl derivatives forms adduct radicals which can undergo [beta]-elimination with substituents such as halogen, PhS, PhSO[subscript]2 to form the alkyl-substituted propene or allene and an eliminated radical which …
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Kinetics and Mechanisms of Metal Carbonyl Radical Reactions
… results in formation of the (.)M(CO)(,m)L(,n) radicals with high quantum efficiencies.
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Picosecond studies of free radical reactions in solution
The 2,7-dihalofluorenylidenes were examined. Electron paramagnetic resonance (EPR) spectroscopy shows that these carbenes are ground-state triplets. These carbenes react with methanol to form 9-methoxy ethers. The absence of a heavy atom effect in this reaction suggests that intersystem crossing is …
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Molecular beam study of polyatomic free radical reactions.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1972. Ph.D.
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Investigations of Thermochemistry and the Kinetics of H Atom Radical Reactions
… species, and the kinetics of various H atom radical reactions relevant to atmospheric and combustion chemistry were investigated using ab initio theoretical techniques and the flash photolysis / resonance fluorescence technique. Using ab initio quantum mechanical calculations up to the G3 …
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Radical reactions for chemoselective modification of peptides / by Caroline Mary Ward.
Investigates generation of carbon-centred radicals in amino acid derivatives, amino acids and peptides, with a view to developing procedures for chemoselective modification of peptides and proteins. Trapping and detection of these radicals has also been studied.
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Probing the dynamics of radical reactions with polyatomic hydrocarbons by crossed-beam dc slice imaging
… beam imaging studies on the reaction of radicals (Cl and CN) with polyatomic hydrocarbons of different functionalities such as pentane isomers, deuterated alkanes, alkenes, and alcohols. The reactively scattered alkyl radicals are probed as a function of collision energy using single …
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Determination of disulfide bond connecting patterns via tandem mass spectrometry (MSn) and biomolecular ion/radical reactions
… pattern. The second methodology used ion/radical reactions and takes advantage of the disulfide bond's susceptibility to radical attack. The methoxy radical was generated via UV photolysis and allowed to react with disulfide linked regio-isomeric peptides. MS<sup>2</sup> CID was conducted …
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The study of bimolecular radical reactions using a novel time-resolved photoionization time-of-flight mass spectrometry and laser absorption spectrometry apparatus
… uses laser absorption spectrometry to probe a radical of interest and thus measure its transient concentration quasi-continuously to precisely determine the kinetics of the reaction. At the same time, the apparatus samples the reactive mixture at various reaction times after the start of …
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Predicting Chemical Reactions at the MechanisticLevel through Deep Reinforcement Learning
… pre-trained on an open database of elementary radical reactions (RMechDB). Then, we use proximal policy optimization (PPO) to fine-tune the model and predict reasonable reaction mechanisms for two case studies: a radical oxidation of the terpene limonene, and a radical cyclization cascade in …
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How do metalloenzymes propagate and control chemical reactions?
… and propagate a dizzying array of chemical reactions, including radical reactions and reactions cleaving carbon-carbon bonds. Metalloenzymes, which contain a metal cofactor, are particularly adept at propagating these reactions. This thesis focuses on several metalloenzymes; each an example …
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Exploratory studies in the use of microwave radiation to assist the extraction of pollutants from various matrices.
… field were noted, probably resulting from free radical reactions. This poses possibly serious problems for the use of microwave radiation as a means for recovering compounds adsorbed on activated carbon. (Abstract sortened by UMI.)
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Assessment of Reactivity Descriptors for the Study of Chemical Reactions
… to study molecular systems and chemical reactions. In this light, ab initio many body techniques enable us, without any experimental input, to compute molecular energetics and a whole range of chemical properties. A twofold classification can be made, separating wave function based …
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Towards Water-Soluble Peroxyl Radial Clocks
… conditions, forming an alkoxyl and acyloxyl radical, the latter of which rapidly decarboxylates to form a carbon centered radical. While peroxyesters are generally decomposed under anaerobic conditions to serve as sources of carbon-centered radicals to initiate radical reactions, it has been …
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Utilising Non-Covalent Interactions in Developing Enantioselective Radical Transformations
… of catalytic, enantioselective strategies for radical reactions, utilising non-covalent interactions to control the asymmetry of these processes. The first research chapter describes the use of chiral phosphoric acids to control the enantioselectivity in the reactions of α-amino radicals. …
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The effects of ionising radiation on polypropylene
… on polypropylene is reviewed. Oxidative and free radical reactions are discussed with particular reference to post-irradiationeffects.Isotactic and atactic polypropylene were δ and electron irradiated to doses of up to 20 megarad. Irradiations weremainly made in air. A series of other polymers …
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The Exploration of a Strategy for Regioselective Arene Amination Utilising Non-Covalent Interactions
… preparation of anilines is one of the most used reactions in industry and academia. Numerous methods which utilise reactive N-centred radicals for the synthesis of anilines from arenes have recently been developed. However, regiochemical control is a major challenge associated with these methods, …
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Radical methods for the synthesis of aliphatic amines
… This thesis details the development of three new radical reactions for the synthesis of aliphatic amines. Following an introduction to radical chemistry and a summary of previous advances in amine synthesis, chapter 2 will describe a general carbonyl alkylative amination reaction, a successful …
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Instrumentation and development of a mass spectrometry system for the study of gas-phase biomolecular ion reactions
<p>Gas-phase reactions of biomolecular ions are highly relevant to the understanding of structures and functions of the biomolecules. Mass spectrometry is a powerful tool in investigating gas-phase ion chemistry. Various mass spectrometers have been developed to explore ion/molecule reactions, …
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