Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.463070
Title: Kinetic and tritium NMR studies of homogeneous and heterogeneous metal catalysis
Author: Lenk, Robert Miroslav
ISNI:       0000 0001 3608 1090
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 1979
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Abstract:
Tritium has been used as an isotopic tracer to study the mechanisms of several reactions in which a variety of catalysts play a prominent role. The first chapter of this thesis deals with the mechanism of labelling by homogeneous metal catalysts with particular regard to the tetrachloroplatinate(II) ion and other Group VIII transition metal chloro complexes. A disagreement in the literature concerning the mechanism is clarified. The catalytic properties of some Lewis acid halides are studied in Chapter 2. These are particularly effective for hydrogen isotope exchange in aromatic compounds. The use of tritium gas in the production of tritiated compounds is reviewed in Chapter 3. Also described here is the design and operation of a manifold to handle multicurie quantities of tritium gas. Chapter 4 is concerned with non-specificity of labelling in tritiated folic acid and methotrexate. Use of tritium nmr spectroscopy has resolved some anomalous chemical degradation results. The final chapter contains a discussion of the mechanism whereby upon reduction of a terminal double bond with tritium gas and a heterogeneous metal catalyst a substantial proportion of label becomes attached to the resulting terminal methyl group. Analysis of multiple labelling patterns in [3H]dihydroalprenoiol by tritium nmr shows that alkene exchange precedes hydrogenation, resulting in unsymmetrical labelling.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.463070  DOI: Not available
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