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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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.
61

Studies on the viability of cyclopropane-containing peptidomimetics and application of the vinylogous Mannich reaction to the syntheses of indolizidine natural products

Reichelt, Andreas 28 August 2008 (has links)
Not available / text
62

Metal complexes of porphyrins and porphycenes in catalytic cyclopropanation and aziridination of alkenes /

Lo, Wai-cheung. January 1998 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 220-234).
63

Preparation and reactions of alkyl- and arylpentacarbonyltungsten anions

Polichnowski, Stanley Whitmore. January 1977 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 270-278).
64

Studies on cardiac transmembrane potentials

Temte, John Vig, January 1967 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. Description based on print version record. Includes bibliographical references.
65

Factors affecting the activity of cyclopropane synthetase in Lactobacillus plantarum

Halper, Laura A. 05 1900 (has links)
This investigation concerned determining certain factors which affect the activity of cyclopropane synthetase in L. plantarum. In vitro experiments showed the enzme to be sensitive to ionic strength and subject to product inhibition by S-adenosylhomocysteine nucleusidase, which relieves this inhibition by degrading SAH to adenine and ribosylhomocysteine.
66

Thermolysis of unsymmetrically substituted vinylcyclopropane systems : site-selectivity in homo-[1,5]-sigmatropic hydrogen migrations

Maxwell, Anderson Richard January 1983 (has links)
This thesis describes the preparation and thermal rearrangement, via homo-[l,5]-hydrogen migration, of a series of unsymmetrically substituted bicyclic and tricyclic vinylcyclo-propanes (65a)-(67a), (68b), (69), (70), (71a), (72a), (74)-(76) and (77a). In each of these compounds two hydrogen atoms one (H[sub=C]) adjacent to the substituent and the other (H[sub=J]) more distant from it - are suitably disposed to undergo homo-[1,5]-hydrogen migration. It was found that an oxygen substituent retarded the rate of homo-[l,5]-migration of the hydrogen atom (H[sub=C]) adjacent to it relative to that of the other more remote hydrogen atom (H[sub=J]) The retarding effect appeared to be dependent on the structure of the oxy-substituted vinylcyclopropane as well as on the nature of the oxygen substituent. A methyl substituent exerted a negligible, retarding effect on the rate of migration of while phenyl and trimethylsilyl groups accelerated the rate of migration of H[sub=C] relative to that of H[sub=J]. The results are consistent with the proposal that in the transition state for the homo-[1,5]-hydrogen migration the carbon centre bearing the migrating hydrogen atom develops a partial negative charge. / Science, Faculty of / Chemistry, Department of / Graduate
67

Syntheses and reactions of copper and manganese complexes of tetradentate polyanionic chelating ligands and their applications incarbon-heteroatom bond formation reactions

朱煒章, Chu, Wai-cheung. January 1997 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
68

Resonance Raman intensity analysis studies of bond selective electronic excitation in 1,2-dihaloethanes and conformational effectson the A-band short-time photodissociation dynamics of 1-iodopropane,iodocyclohexane and iodocyclopentane

鄭旭明, Zheng, Xuming. January 2000 (has links)
published_or_final_version / abstract / toc / Chemistry / Doctoral / Doctor of Philosophy
69

Metal complexes of porphyrins and porphycenes in catalytic cyclopropanation and aziridination of alkenes

盧偉祥, Lo, Wai-cheung. January 1998 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
70

Resonance Raman intensity analysis studies of bond selective electronic excitation in 1,2-dihaloethanes and conformational effects on the A-band short-time photodissociation dynamics of 1-iodopropane, iodocyclohexane and iodocyclopentane /

Zheng, Xuming. January 2000 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 213-224).

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