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Dissertations / Theses on the topic 'Free radical reaction'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Zhao, Zhijun. "Laser flash photolysis studies of some gas phase reactions of atmospheric interest." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31790.

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Thesis (Ph.D)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2010.<br>Committee Chair: Wine, Paul; Committee Member: Huey, Greg; Committee Member: Mulholland, James; Committee Member: Nenes, Athanasios; Committee Member: Weber, Rodney. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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2

Hart-Smith, Gene On Chemistry Faculty of Science UNSW. "Mass spectrometric investigations into free radical polymerisation reaction mechanisms." Awarded by:University of New South Wales. Chemistry, 2009. http://handle.unsw.edu.au/1959.4/44621.

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Contemporary mass spectrometry (MS) instrumentation featuring electrospray ionisation (ESI) or matrix-assisted laser desorption/ionisation (MALDI) ion sources were used to characterise the polymer distributions generated in various free radical polymerisations, allowing insights to be gained into the reaction mechanisms operating in these systems. In studying atom transfer radical polymerisation (ATRP) mediated star polymerisations of methyl acrylate (MA), ESI was found to be more effective in obtaining a comprehensive list of the distinct products present in the samples under investigation wh

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3

Friedline, Robert Alan. "The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11157.

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t-Butoxyl radical has been used as a chemical model for hydrogen abstractions in many enzymatic and biological systems. However, the question has arisen as to how well this reactive intermediate mimics these systems. In addressing this concern, absolute rate constants and Arrhenius parameters for hydrogen abstraction by t-butoxyl radical were measured for a broad class of substrates including amines, hydrocarbons, and alcohols using laser flash photolysis. Initially, no obvious reactivity relationship between rate constant and substrate structure was observed for these homolytic reactions.

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4

Sadeghipour, Mitra Jr. "Hydrocarbon Functionalization via a New Free Radical-Based Condensation Reaction." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30627.

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A new free radical chain process for the allylation of hydrocarbons and some other substrates utilizing substituted allyl bromides (R-H + C=C-C-Br -> R-C-C=C + HBr) has been developed. Good to excellent yields were observed in all cases. Kinetic chain measurements and competition experiments were performed in order to elucidate the mechanism of the reaction. Overall, the results are consistent with a free radical chain process with bromine atom as the chain carrier. Substitution effects on the reactivity of the allyl bromides (CH2=C(Z)CH2Br) and their i

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5

Tirumala, Vijaya Raghavan. "Reaction control in quiescent systems of free-radical retrograde-precipitation polymerization /." Available online. Click here, 2003. http://sunshine.lib.mtu.edu/ETD/DISS/tirumalav/Dissertation.pdf.

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6

Jatoi, Ashique Hussain. "Some recent developments in free-radical additions to olefins and heteroarenes." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0055/document.

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Dans le cadre de cette thèse, nous avons étudié plusieurs processus radicalaires et en particulier l'addition de radicaux libres sur des systèmes insaturés tels que les alcènes et les hétérocycles aromatiques. Nous avons ainsi montré la réactivité unique des radicaux carbamoyles, issus de la décarboxylation des acides oxamiques. La carbamoylation "sans métal" photocatalysée des hétérocycles a donc été réalisée en présence d'un réactif iodé hypervalent, conduisant à des bases hétéroaromatiques fonctionnalisées, généralement avec de bons rendements. Le processus a été étendu aux acides oxamiques

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7

Minakata, Daisuke. "Development of aqueous phase hydroxyl radical reaction rate constants predictors for advanced oxidation processes." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37127.

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Emerging contaminants are defined as synthetic or naturally occurring chemicals or microorganisms that are not currently regulated but have the potential to enter the environment and cause adverse ecological and/or human health effects. With recent development in analytical techniques, emerging contaminants have been detected in wastewater, source water, and finished drinking water. These environmental occurrence data have raised public concern about the fate and ecological impacts of such compounds. Concerns regarding emerging contaminants and the many chemicals that are in use or producti

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8

Zhang, Tao. "State-selected study of ion-molecule reaction dynamics, photodissociation dynamics and free radical studies using synchrotron radiation /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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9

Zhu, Lei. "Aqueous phase reaction kinetics of organic sulfur compounds of atmospheric interest." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11172004-142820/unrestricted/zhu%5Flei%5F200412%5Fphd.pdf.

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Thesis (Ph. D.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2005.<br>Davis, Douglas, Committee Member ; Huey, Greg, Committee Member ; Nenes, Athanasios, Committee Member ; Weber, Rodney, Committee Member ; Whetten, Robert, Committee Member ; Wine, Paul H., Committee Chair. Includes bibliographical references.

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10

Imaram, Witcha. "Reaction of peroxynitrite and uric acid studied by ESR spin trapping and mass spectrometry free radical formation and product identification /." [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0022880.

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11

England, Richard Mark. "Free Radical Polymerisation of Linear and Highly Branched Polymers Using Reversible Addition Fragmentation chain-Transfer and an Alkylation Reaction with a Silyl Enol Ether." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522023.

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12

Barbe, Pascal. "Étude expérimentale de la réaction de couplage oxydant du méthane à l'aide d'un réacteur continu agité à surface catalytique variable." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL104N.

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Le couplage oxydant du méthane en présence d'oxydes métalliques apparait comme l'une des voies les plus prometteuses de transformation chimique directe du gaz naturel en éthylène. Cependant, expérimentalement, un rendement supérieur à 25% n'a jamais pu être atteint. Il a été suggéré que cette limite pourrait être due aux réactions radicalaires en phase gazeuse entrant en compétition avec les réactions catalytiques hétérogènes, réputées à priori plus sélectives. Le but de la thèse, effectuée dans le cadre du consortium ACTANE, consiste précisément à obtenir des données expérimentales susceptibl

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13

Ishaq, Ahtsham. "The development and use of novel green radical methodology." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=158370.

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Over the last forty years the steady use of radical reactions as the key steps in syntheses has increased. The most commonly used radical reagent is tributyl tinhydride. However such tin based radical reagents are toxic and often contaminate the product as they are difficult to remove. As an alternative to these tin reagents, a novel NaBH4/U.V. system was developed. This system was successfully used to effect the radical reduction of various aromatic halides. In light of these results it was thought that other useful transformations such as C-C bond formation could be achieved. Radical cyclisa

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14

Wood, Geoffrey Paul Farra. "Theoretical Investigations of Radical-Mediated Protein Oxidation." University of Sydney, 2006. http://hdl.handle.net/2123/1413.

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Doctor of Philosophy (PhD)<br>This thesis primarily details the application of high-level ab initio quantum chemistry techniques in order to understand aspects of free-radical mediated protein oxidation. Traditionally, product analysis and electron paramagnetic resonance (EPR) spectroscopy are the primary means for elucidating the chemistry of protein oxidation. However, in experiments involving relatively small proteins reacting with a controlled radical-flux, a vast array of compounds can be produced, which are often difficult to analyse. Quantum chemical techniques on the other hand, can ca

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15

Barreto, Joao Pedro Cabaco Moniz. "Dioxygen free radical reactions." Thesis, Oxford Brookes University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389105.

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16

Euapermkiati, Anucha. "Free radical telomerisation reactions." Thesis, University of Bradford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278895.

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17

Hancock-Chen, Tanya. "Biologically relevant free radical reactions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0019/NQ58282.pdf.

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18

Singh, Rajinder. "Free radical ring expansion reactions." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293427.

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19

Rouveirolles, Pierre. "Etude de la cinetique en phase gazeuse de reactions du radical nh2 a haute temperature." Orléans, 1987. http://www.theses.fr/1987ORLE2019.

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Reactions du radical nh::(2) avec des alcanes, h::(2) et h::(2)o. Les reactions etudiees jouent un role important dans la modelisation des processus de combustion ou de post-combustion des hydrocarbure et dans la connaissance du mecanisme reactionnel gouvernant le traitement par injection d'ammoniac des oxydes d'azote contenus dans les gaz d'echappement des machines thermiques

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20

Denis, Isabelle. "Photodégradation des composés organiques volatils biogéniques dans l'atmosphère : étude de la réactivité du (beta)-pinène vis à vis des radicaux hydroxyles ; cas de la réactivité en milieu hétérogène." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10129.

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L'objectif de ce travail etait d'etudier la photodegradation du beta-pinene, composeorganique volatil biogenique, en presence de radicaux hydroxyles et de determiner l'impact de particules solides sur cette photodegradation. Des artefacts analytiques ont ete rencontres lors de la mise au point du protocole de prelevement et d'analyse, et provenaient de la degradation de l'espece organique sur le support de prelevement pendant la thermodesorption. L'application d'un calcul correctif a permis de minimiser les erreurs d'artefact. Les etudes cinetiques effectuees sur les experiences en milieu homo

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21

Hannachi, Hassen. "Etudes cinetiques sous conditions atmospheriques simulees des reactions de composes carbonyles avec oh', o::(3), no'::(3) : consequences sur la chimie de basse troposphere." Paris 7, 1986. http://www.theses.fr/1986PA077213.

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22

Bebbington, Magnus W. P. "Nitrogen-directed free radical rearrangements." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:316d2379-4019-4361-937d-ff1e064f8bb9.

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This thesis describes efforts to develop new methods for the synthesis of bridged azacycles using nitrogen-directed free radical rearrangements. Free radical addition to 7-azanorbornadienes were carried out to give 7-substituted 2- azanorbornenes (Scheme a.l, X-Y = RS-H or PhSe-H). [illustration in text ...] Scheme a. 1 Nitrogen-directed homoallylic radical rearrangement via intermolecular radical addition. A conceptually novel and theoretically interesting nitrogen-directed neophyl rearrangement (Scheme a.2) was developed into a synthesis of 2- azabenzonorbornanes 2. [illustration in text ...

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23

Smith, Dean A. "The demonstration of electron-transfer reactions and their effect on model lignin condensation reactions under alkaline pulping conditions." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/5700.

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24

Sacripante, Guerino. "Radical reactions in organic synthesis." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75340.

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The 4-substituted glutarimide required for the synthesis of sesbanimide (53) was obtained by free radical addition of iodoacetamide onto the $ alpha, beta$-unsaturated ester (81) mediated by tributyltin; the lactol ring C was prepared by the analogous free radical cyclization of the $ alpha$-bromo-dipropargyl ketal 73.<br>The syntheses of tricyclic carbapenems involved appropriately substituted monocyclic azetidinone precursors. Free radical 5- exo cyclizations led to the relatively unstable benzo carbapenems 116, 119 and 120. The 6- exo mode, however, afforded stable benzo carbacephems 125, 1

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25

Hon, Nyok-Sai. "Formation, characterization, and chemical reactions of free radicals in lignin." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54437.

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Free radicals are produced in lignin during mechanical treatment and irradiation with light of various wavelengths. During mechanical treatment, the lignin macromolecule is degraded severely as revealed by ESR and viscosity measurements. Several types of mechano-radicals are produced in lignin during the mechanical process. Among these the phenoxy radicals are rather stable, where carbon-radicals are labile at ambient conditions. Transient mechano-radicals reacted readily with oxygen molecules to produce peroxy radicals even at 77°K, but they decayed rapidly at ambient temperature. Photodegr

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26

Swann, Elizabeth. "An investigation of new free radical reactions." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232882.

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27

Huther, Nathalie. "Novel manganese carbonyl-mediated free radical reactions." Thesis, University of York, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403967.

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28

Annis, Michael Colin. "Free radical cascade reactions involving furan rings." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394991.

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29

Bradshaw, N. "Atom and free radical reactive scattering." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375081.

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30

Seely, Franklin Lee. "Bis(trimethylstannyl)benzopinacolate Promoted Radical Carbon-Carbon Bond Forming Reactions and Related Studies." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290711413.

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31

顧深 and Shen Gu. "Studies on Lewis acid-promoted radical cyclization reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243083.

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32

Gu, Shen. "Studies on Lewis acid-promoted radical cyclization reactions /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B24729735.

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33

Wang, Aileen Ruiling Zhu Shiping. "Diffusion-controlled atom transfer radical polymerization." *McMaster only, 2005.

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34

Olivarès, Christel M. "Polyfluorinated systems resulting from free radical addition reactions." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3861/.

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The first part of this work was to synthesise partially fluorinated reactive compounds and then to study their reactivity towards nucleophiles and electrophiles. These reactive compounds were obtained in a two step process from both cyclopentane and adamantane and in a three step process for cyclopentanol. The first step was the free radical addition of the cycloalkanes, cycloalcohol to hexafluoropropene via thermal and/or radiochemical alkylations. For the cyclic alkane derivatives, the second step was a stereospecific dehydrofluorination of the fluorocarbon chain, whereas for the cyclic alco

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35

Maia, Dayanne Lara Holanda. "Malenization reaction of castor oil in the presence of free radicals initiators." Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16561.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>The maleate castor oil is used in drying oils, water-soluble paints, personal care products, synthetic lubricants, etc. Initially, maleate castor oil production was studied from of maleinization reaction between castor oil and maleic anhydride. Then, maleinization reactions of castor oil were carried out using benzoyl peroxide (BPO) and di-tert-butyl peroxide (DTBP) as reaction initiator to maleate castor oil production. Reactions were carried out in a batch-type reactor. The performance of the free-radical reaction was evaluated b

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36

MacPherson, A. P. "Gas phase heterocyclisation reactions of free radicals." Thesis, University of Edinburgh, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.657154.

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A new strategy of the synthesis of benzofurans was extended to cases with substituents on the 2,3,5-and/or 6 positions. This involves pyrolysis of 2-allyloxycinnamate esters to generate oxygen centred radicals which cyclise with loss of carbon dioxide and an alkyl radical. Small amounts of substituted coumarin by-products were identified in some cases and their formation rationalised mechanistically. This work was extended in four ways. Firstly the use of 2-t-butylthiocinnamate ester, which generates a sulphur centred radical on pyrolysis, leads to benzothiophene in adequate yield. Secondly wh

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37

Ding, Shijie. "Atom transfer radical polymerization." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1225138911&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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38

Julião, Murilo Sérgio da Silva. "Comportamento eletroquímico de nitrofuranos em eletrodos de diamante dopado com boro-modelo para o mecanismo de ação de nitrocompostos com atividades antichagásica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-09052007-103623/.

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O comportamento eletroquímico do Nitrofural (NFZ) foi estudado em eletrodos de pasta de carbono, carbono vítreo e diamante altamente dopado com boro (EDADB) em tampão Britton-Robinson (BR) usando a voltametria cíclica. Os melhores resultados foram obtidos em EDADB, no qual foi possível estabilizar o radical aniônico (R-NO2•&#8254) em meio predominantemente aquoso, como também estudar a interação entre o R-NO2•‾ a glutationa (GSH), a L-cisteína (Cis) e o O2. Somente na superfície do EDADB, o NFZ foi diretamente reduzido à amina derivada (R-NH2) no intervalo de 2,02 ≤ pH

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39

Smith, M. J. C. "Flash photolysis studies of gas phase free radical reactions." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355811.

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40

Myint, Pe. "Free radical reactions of hyaluronic acid in aqueous solution." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292943.

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41

Hutchison, Helen Susan. "Gas phase cyclisation and rearrangement reactions of aromatic free radicals." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/15081.

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42

Black, Michael. "Gas phase cyclisation reactions of aromatic free radicals." Thesis, University of Edinburgh, 1990. http://hdl.handle.net/1842/10822.

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43

Guiver, S. C. "Thermochemistry of cyclic and acyclic radicals and kinetics of their recombination reactions." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376044.

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44

Cai, Yudong. "Synthetic and mechanistic aspects of free-radical reactions in solution." Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322240.

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45

Sharpe, D. J. "Applications of novel metal-free radical reactions in organic systems." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425469.

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46

Farren, Christopher. "Polyfluorinated compounds via free-radical reactions of alcohols and diols." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4791/.

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Site-selective incorporation of fluorocarbon substituents into organic molecules is a field of continuing interest, and a variety of approaches have been reported. The research described within this thesis is concerned with the functionalisation of C-H bonds adjacent to primary or secondary hydroxyl units via free-radical additions to fluoroalkenes. A range of cyclic and acyclic alcohols and diols have been functionalised in this manner, and both substituent and electronic effects on the radical process have been investigated. Further functionalisation of the polyfluoroalkylated products has b

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47

Corser, David Alan. "Novel enzyme- and free radical-mediated reactions of oxirane derivatives." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/27040.

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The thesis describes the use of various hydrolases in the preparation of enantiomerically enriched epoxyesters. Optically enriched n-butyl 4,5- epoxypentanoate was prepared with a 64% enantiomeric excess via the porcine pancreatic lipase-catalysed hydrolysis of the racemic ester. The hydrolase-catalysed hydrolysis of two prochiral epoxydiesters; meso 2,3-epoxybutan-1 A-diyl dibutanoate and 2,3-epoxy-2-butanoyloxymethylpropan-1-yl butanoate, were performed with several lipases, with the enantiomerically enriched epoxymonoesters being obtained in up to 80% and 65% enantiomeric excesses, respecti

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48

Johnson, Kathryn Michelle. "A mechanistic investigation into the reaction of haem proteins with peroxides and related compounds." Thesis, University of York, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359272.

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Laine, Patrick L. "Laser flash photolysis studies of halogen atom reactions of atmospheric interest." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42817.

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The Earth's atmosphere is a large photochemical reactor consisting primarily of N2 (~78%) and O2 (~21%) with Ar and water vapor being the next most abundant constituents. All of the remaining gases in the atmosphere are referred to as 'trace gases', and they play a critical role in understanding climate change, urban air quality, ozone production and depletion, and in determining the overall 'health' of the atmosphere. These trace components are present in our atmosphere with mixing ratios, i.e., mole fractions, ranging from sub parts per trillion to several hundred parts per million. One c

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50

Lush, Rachel K. "Hydrogen atom abstraction pathways to functionalised free radicals." Thesis, University of Oxford, 2001. http://ora.ox.ac.uk/objects/uuid:84e82ee6-f8b4-4f11-a3d2-30af12f4e0b3.

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Radical translocation chemistry has classically been employed for the generation of carboncentred radicals as a means of remotely functionalising nominally unreactive sites. Previous work within the group had investigated vinyl radicals to effect translocation and had identified a need for a more reactive abstracting radical. In this regard, the high energy of alkoxyl radicals would facilitate rapid 1,5-hydrogen abstraction as opposed to simple reduction. This thesis describes the use of alkoxyl radicals, generated from N-alkoxyphthalimides, to abstract a hydrogen atom selectively from the α-p

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