• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 150
  • 23
  • 20
  • 5
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 225
  • 225
  • 163
  • 56
  • 48
  • 45
  • 33
  • 31
  • 22
  • 21
  • 21
  • 18
  • 17
  • 17
  • 16
  • 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.
131

Arene transition metal complexes in synthesis

Mobbs, B. E. January 1985 (has links)
This thesis deals with the applications of organopalladium and organochromium chemistry to the functionalisation of the benzopyran ring system, at a variety of oxidation levels. Section I demonstrates the functionalisation of 3-, 6-, and 8-bromochromones via palladium (0) insertion into the C-Br bond. The resultant arylpalladium species are shown to undergo addition to the least substituted end of a variety of olefins including methyl acrylate, acrylonitrile and styrene. Subsequent palladium-hydride elimination leads to overall palladium catalysed vinylation of the chromone and the synthesis of a number of novel compounds. Vinylation occurs regiospecifically at the site of chromone bromination and is shown to allow clean substituent introduction into each of the three sites. The palladium catalysed reaction of 3,6-dibromo-chromone with methyl acrylate leads to vinylation at both the C3 and C6 positions. Carbonylation of the 6-bromochromone in ethanol or butanol leads to the 6-ethyl or 6-butyl esters respectively. The palladium catalysed vinylation of the 6-bromochromone with ethyl vinyl ether leads to a mixture of products from addition of the chromone to either end of the olefin. With p-bromophenol or p-bromo-N,N-dimethylaniline the reaction gives exclusively the acetylated product arising from addition to the more substituted end of the olefin. This change in orientation is rationalised by considering the polarisation of the olefin and the arylpalladium species. Section II demonstrates the functionalisation of chroman and 4-chromanol via coordination to the Cr(CO)<sub>3</sub> moiety. (η<sup>6</sup>-Chroman)Cr(CO)<sub>3</sub> is synthesised and is shown to undergo regiospecific ring deprotonation at C8 under kinetic conditions or regiospecific benzylic deprotonation at C4 under thermodynamic conditions. The resultant anions are quenched with alkyl halides, aldehydes, Eschenmoser's salt and methyl disulphide resulting in selective functionalisation of either site. No mixed products are observed. The uncomplexed arene is shown to be totally unreactive under identical conditions. (η<sup>6</sup>-4-Chromanol)Cr(CO)<sub>3</sub> is synthesised and is shown to undergo regiospecific C8 ring deprotonation by comparison with authentic samples of the C5 and C8 methylated alcohols. Protection of the hydroxyl group as its methyl, t-butyldimethylsilyl or methoxymethyl ethers is found not to alter the regiochemistry of deprotonation. The 4-chromanol t-butyldimethylsilyl and tri-i-propylsilyl ethers are synthesised and coordinated to the metal unit. Cleavage of the silyl ethers is shown to proceed with loss of stereochemistry, indicating C-0 bond cleavage.
132

Electron transfer processes in the photolysis of transition metal N-hetrocyclic complexes / by Ghulam Mohammad Malik

Malik, Ghulam Mohammad January 1979 (has links)
Typescript (photocopy) / viii, 283 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1980
133

Transition metal chelates with Schiff bases derived from salicylaldehyde and diamo ethane / Transition metal complexes

Summerton, Alvin Paul January 1979 (has links)
Title on spine: Transition metal complexes / 173 leaves : ill., tables, graphs ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1979) from the Dept. of Physical and Inorganic Chemistry, University of Adelaide
134

Metal carbonyl fluoride complexes / by Ernst Horn

Horn, Ernst January 1983 (has links)
Typescript (photocopy) / 2 microfiche in end pocket / 190 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1984
135

Sigmatropic and haptotropic shifts in complexes of cyclopenta[l]phenanthrene /

Rigby, Suzie S. January 1997 (has links)
Thesis (Ph.D.) -- McMaster University, 1997. / Includes bibliographical references. Also available via World Wide Web.
136

Electron transfer processes in the photolysis of transition metal N-hetrocyclic complexes /

Malik, Ghulam Mohammad. January 1979 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1980. / Typescript (photocopy).
137

Metal carbonyl fluoride complexes /

Horn, Ernst. January 1983 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1984. / Typescript (photocopy). 2 microfiche in end pocket.
138

Charge density waves and structural modulations in polytelluride compounds

Malliakas, Christos D. January 2007 (has links)
Thesis (Ph. D.)--Michigan State University. Dept. of Chemistry, 2007. / Title from PDF t.p. (viewed on Apr. 16, 2009) Includes bibliographical references. Also issued in print.
139

Preconcentration And Atomic Spectrometric Determination of Rare Earth Elements (Rees) In Environmental Samples/

Pasinli, Türker. Eroğlu, Ahmet E. January 2004 (has links)
Thesis (Master)--İzmir Institute of Technology, İzmir, 2004. / Includes bibliographical references (leaves. 50-54).
140

Spectrophotometry of rare earth chloride and fluoride complexes in molten salt solutions using a remote high temperature sensor

Cooper, Jeffery W., January 2004 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2004. / Typescript. Vita. Includes bibliographical references (leaves 118-122). Also available on the Internet.

Page generated in 0.0481 seconds