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Browse Dissertations and Theses - Chemistry by Title
Now showing items 1792-1811 of 2941
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Palladium (II) / sulfoxide - promoted strategies for efficient and selective allylic C-H oxidations (2017-10-05)The scientific community has born witness to incredible advancements in organic chemistry. Exemplified by total syntheses of molecules of astonishing complexity, it is becoming more clear that the conquest of a molecular ...
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(2011-05-25)Palladium-catalyzed cross-coupling of γ-substituted allylic silanolates with aryl bromides was investigated. It was discovered that γ-selectivity is heavily influenced by the substituents at silicon. It is proposed that ...
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(2013-02-03)The selective formation of new carbon-carbon bonds is a central challenge for organic synthesis; organic molecules are based on carbon scaffolds which must be assembled from simple building blocks. Since Kolbe performed ...
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(2004)The transmetalation mechanism was examined through the natural abundance 13C NMR kinetic isotope effect (KIE) studies. This provided evidence for either palladium-olefin complexation or a Heck-type carbometalation as the ...
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(2005)The mechanism of the cross-coupling reactions was studied through kinetic analysis employing initial rate analysis. These studies revealed that transmetalation from a arylpalladium(II) silanolate is the turn over limiting ...
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(2009)Finally, an E,Z-1,4-bissilylbutadiene reagent was prepared for the synthesis of unsymmetrical, highly conjugated systems. Two distinct silyl substituents were differentiated in the cross-coupling reaction through the initial ...
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(2008)A procedure for the preparation of multi-substituted indoles using the Larock indole synthesis was developed. The heteroannulation reaction can be used to prepare 2,3-disubstituted indoles in good yields. The identification ...
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(2007)Mechanistic investigations of the palladium-catalyzed cross-coupling of aryldimethylsilanolates demonstrated that transmetalation proceeds directly from an arylpalladium(II) silanolate intermediate without external activation. ...
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(2012-06-27)The reductive eliminations of primary arylamines from a series of bisphosphine-ligated arylpalladium(II) parent amido complexes countered several established trends. In contrast to arylamido and alkylamido complexes of the ...
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(2008)Pd/PVP catalyzed H-D exchange in substituted pyridines and other nitrogen containing heterocyclic compounds was followed using 1H-NMR spectroscopy. Substitution at the position alpha to the endocyclic nitrogen was favored ...
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(1986)Biologically active extracts of the Caribbean sponges Agelas coniferin and Agelas cf. mauritiana have been found to contain seven new bromopyrroles (1a, 3a-8a), as well as the known debromooroidin-dimer sceptrin (2a). These ...
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(2006)Chiral phosphoramide-catalyzed, enantioselective aldol additions of isobutyraldehyde-derived trichlorosilyl enol ether to aldehydes have been investigated. These aldol additions are general and provide beta-hydroxy aldehydes ...
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(1997)Part B. Progress towards a new family of hyperbranched polymers based on the condensation of an AB$\sb2$ 9-phenylcarbazole monomer 169 has been described. Initial condensation reactions have provided material of greater ...
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(2005)Finally, the syntheses of site-specifically deuterated arachidonic acids containing a remote tritium label are reported. These radiolabeled substrates would allow the characterization of the initial radical intermediate ...
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(2008)To this end, naphthoyl substituted cytosines were synthesized and incorporated into PNA monomers followed by preparation of PNA oligomers containing multiple substitutions of the modified cytosine. Thermal denaturation ...
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(1981)Two aromatic fluorination methods, the decomposition of aryl azides and the decomposition of aryl triazenes, were investigated as methods potentially suitable for fluorine-18 labeling of estrogens. The aryl triazene method ...
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Now showing items 1792-1811 of 2941