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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.
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Showing 221 to 230 of 1106 (0.082 seconds)Spelling suggestions: "subject:"transitionmetal"" "subject:"transition.metal""
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Laser spectroscopy of the A4II-X4[summation]- transition of molybdenumnitride (MoN)施少群, Sze, Siu-kwan. January 1995 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
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| 222 |
Molecular structures and physicochemical properties of some chiral andhelical transition metal complexes with polypyridines and tetradentateanionic ligands何國強, Ho, Kwok-keung, Paul. January 1996 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
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| 223 |
MAGNETIC PROPERTIES AND MOESSBAUER SPECTRA OF TRANSITION-METAL COMPLEXESWesolowski, Wayne E. January 1971 (has links)
No description available.
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| 224 |
Electronic structures of transition metal oxidesGuo, Yuzheng January 2014 (has links)
No description available.
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| 225 |
Transition metal complexes of ethanolamineHoward, Walter Jack 12 1900 (has links)
No description available.
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| 226 |
The synthesis and characterization of some gallophosphates using transition metal complexes as templatesStalder, Sloane Marie 05 1900 (has links)
No description available.
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| 227 |
The synthesis and properties of several aluminophophates templated by chiral transition metal complexesGray, Mary Jo 08 1900 (has links)
No description available.
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| 228 |
Preparation and characterization of thioaurite cluster compoundsSchaaff, T. Gregory 08 1900 (has links)
No description available.
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| 229 |
Synthesis and thermal decomposition of [CM(CO)CH₂S(Ph)CH₂CH=CH₂] BF₄, M=Fe, RuBruno, Deborah Suzanne 12 1900 (has links)
No description available.
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| 230 |
Transition metal catalyzed hydroborations with pinacolborane: new applications and mechanistic investigationsHleba, Yonek Bryan 12 September 2007 (has links)
A methodology for the catalytic asymmetric hydroboration of vinylarenes with pinacolborane has been developed. Use of pinacolborane in hydroboration, especially catalytic asymmetric hydroboration grants direct access to chiral boronate esters, without the cryogenic temperatures required for catalytic hydroboration with catecholborane and the subsequent transesterification with excess pinacol. These chiral boronate esters were then subjected to a homologation/oxidation sequence previously refined in our labs to prepare Naproxen™ in 66% yield and 88% enantiopurity from its corresponding vinyl arene precursor.
A survey of metal catalysts, solvents and ligands revealed remarkable changes in regioselectivity with changes in metal. Rhodium catalysts in combination with pinacolborane were able to provide regioselectivity for the secondary branched isomer equivalent to those obtained with catecholborane. Iridium catalysts showed a near perfect regioselectivity for the primary linear isomer. With respect to the choice of chiral ligand, complete reversal in the enantiomer obtained was observed with the choice of hydroborating reagent from catecholborane to pinacolborane.
In order to understand the regioselectivity observed under iridium catalysis, deuterium labeling studies were undertaken. A synthesis of the deuterated hydroboration reagent pinacolborane was first completed. From the results of these studies, in combination with published thermodynamic data, a mechanism for the iridium catalyzed hydroboration of alkenes was proposed. / Thesis (Ph.D, Chemistry) -- Queen's University, 2007-08-29 09:30:38.571
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