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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 21 to 30 of 374 (0.188 seconds)Spelling suggestions: "subject:"freeradicals"" "subject:"freeradical""
| 21 |
Determination of the philicity of the aryl radicalKirsop, Peter James January 2007 (has links)
Radicals, like other functional groups, may be classed as nucleophiles or electrophiles depending upon their character. Much has been done in the past to determine the· nucleophilicity or electrophilicity of a wide ra~ge of radicals, but it .. does not appear that the philicity ofthe aryl radical has yet been determined. A competitive cyclisation of an aryl radical to one of two alkyl chains containing olefins ofdiffering electron density was undertaken to determine aryl radical philicity. Prior to cyclisation, synthesis of the precursors was required, starting from simple commercially available aromatic compounds. A wide range of allyloxy aromatic compounds with different substituents on the two olefins was synthesised. In the course of the required multi-step synthesis many previously unreported compounds were isolated and fully characterised, including crystal X-ray diffraction studies where crystals were obtained. To investigate the effects of different electron density in the aryl ring a further range of competitive cyclisation precursors were synthesised with an ester group para to the site where the aryl radical is formed. Studies into the synthesis of a competitive cyclisation precursor with olefin bearing side chains with no heteroatom were also undertaken. The procedure for the cyclisation reactions and subsequent work-up was optimised under both conventional and microwave methodology. Analysis of the products was performed using both quantitative and qualitative analytical techniques. Quantitative analysis was performed using gas chromatography, IH NMR spectroscopy with an internal standard and isolation of products. Qualitative analysis was performed using both ID and 2D NMR spectroscopy. Analysis of the results of the competitive cyclisation reactions show beyond reasonable doubt that the aryl radical is nucleophilic in character.
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| 22 |
Free radicals in biological processesThornalley, Paul J. January 1982 (has links)
No description available.
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| 23 |
Total syntheses of (+,-) pleurotin and (+,-) dihydropleurotin acid /Huang, Horng-Chih January 1988 (has links)
No description available.
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| 24 |
Clinically relevant detection methods for oxidant processes in biological systemsBacon, Pamela Joy January 1995 (has links)
No description available.
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| 25 |
Mechanisms of cell damage and recovery in cryopreserved freshwater protistsFleck, Roland Alexander January 1998 (has links)
No description available.
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| 26 |
The synthesis and antimicrobial activities of 2H-pyran-2-onesMarrison, Lester January 1998 (has links)
No description available.
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| 27 |
The role of energy restriction and environmental agent exposure in the aetiology of malnutrition related diabetes mellitus (MRDM)McDonagh, Margaret P. January 1997 (has links)
No description available.
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| 28 |
Oxidative stress and biomolecule damage in human IDDMHannon-Fletcher, Mary Philomena Anne January 1999 (has links)
No description available.
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| 29 |
The photodecomposition of carboxylate complexes of ionic iron (III) porphyrins in solutionOsborne, Victoria A. January 1999 (has links)
No description available.
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| 30 |
Reactive oxygen species in atherosclerosisSmith, Cheryl January 1993 (has links)
No description available.
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