Index Catalog // ScholarsArchive@OSU

Synthesis of novel ambifunctional atropisomeric 2,2',6,6'-tetrasubstituted biphenyls and investigation of their properties and organocatalytic activity

Creator:: Sephton, Mark Alan
Abstract:: Ambifunctional axially chiral 2,2',6,6'-tetrasubstituted biphenyls containing nucleophilic (or basic) functional groups juxtaposed with hydrogen-bond donors were synthesized and their properties studied. Applications for the prepared biaryls as potential organocatalysts for enantioselective carbon-carbon bond forming reactions were examined. Processes investigated included: aldol, Michael, nitroaldol (Henry), and Baylis-Hillman reactions. The novel amidoamine...
Resource Type:: Dissertation
Full Text:: Activity. Abstract approved: Paul R. Blakemore Ambifunctional axially chiral 2,2

Part I: Total Syntheses of Mandelalide A and Isomandelalide A. Part II: Role of π-Stacking on Sharpless Dihydroxylation of cis-Enynes: Synthetic Studies Toward All Carbon Macrocyclic Mandelalide B

Creator:: Ghosh, Ankan
Abstract:: Part I of this dissertation includes the chronological synthetic background of mandelalide A as well as the synthesis of the C1-C14 glycosylated southern subunit of mandelalide. A key aspect of the synthesis includes a novel silver-catalyzed cyclization (AgCC) of a propargylic benzoate to construct the substituted cis-pyran ring system present...
Resource Type:: Dissertation
Full Text:: extend my thankfulness to Prof. Paul R. Blakemore and Prof. Sandra Loesgen with whom I took most of the

Substitutional Effects on the Electromechanical Properties of Lead-free, Piezoelectric (Na₀.₅Bi₀.₅)TiO₃-BaTiO₃ (NBT-BT)

Creator:: McQuade, Ryan R.
Abstract:: This work investigates the effect of cation substitution on the properties of the lead-free, solid solution (Na₀.₅Bi₀.₅)TiO₃-BaTiO₃ (NBT-BT). Substitution into NBT-BT increases disorder and increases the relaxor ferroelectric properties. These relaxor ferroelectric materials show large piezoelectric strains that can be utilized in actuator applications. Ceramic samples were prepared using standard...
Resource Type:: Dissertation
Full Text:: : _____________________________________________________ Michelle R. Dolgos This work investigates the effect of cation substitution on the

Stereospecific Synthesis of Stereotriad Motifs and Alkenes Using Enantioenriched sp³-Hybridized Carbenoids

Creator:: Xun, Sun
Abstract:: Enantioenriched sp³-hybridized carbenoid reagents CR1R2MX (X = nucleofuge, M = electrofuge) of different types were investigated for the synthesis of polysubstituted alkyl chains by iterative stereospecific reagent-controlled homologation (StReCH) and for the stereospecific connective synthesis of alkenes by eliminative cross-coupling. In the first part, putative enantioenriched α-chloroalkyllithiums (CHRLiCl) were employed...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Paul R. Blakemore Enantioenriched sp3-hybridized carbenoid reagents CR1R2MX (X

Development of Methods for Stereoselective Carbon-Carbon Bond Formation

Creator:: Wu, Zhenhua
Abstract:: Three distinct methods to achieve the stereoselective synthesis of carbon-carbon bonds were investigated, encompassing: (i) the formation of axially chiral biaryl molecules by enantioselective Suzuki cross-coupling, (ii) the synthesis of α-phenylalkylboronic esters by enantioselective chain extension, and (iii) the stereospecific synthesis of alkenes by eliminative cross-coupling of enantioenriched sp³-hybridized carbenoids....
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Paul R. Blakemore Three distinct methods to achieve the stereoselective synthesis of

Preparation and characterization of polymer-SiO₂ hybrids

Creator:: Ferguson, Morgan L.
Abstract:: In a search for designed materials that mimic those found in biological systems, combining polymers with inorganic materials in sol-gel chemistry processes has gained momentum in the research world since the 1990's. This work methodically investigated the properties of several related polymer-SiO₂ hybrids prepared by a simple methodology that could...
Resource Type:: Dissertation
Full Text:: : __________________________________________________________ Philip R. Watson In a search for designed materials that mimic those found in

Structure-Property Relationships of Disordered Electronic Materials : From Crystalline to Amorphous

Creator:: Surta, Todd Wesley, Jr.
Abstract:: Two perovskite materials (Bi0.5(A)0.5)(Sc0.5Nb0.5)O3, where A = K+ and Na+ were synthesized phase pure for the first time. Their structures were determined by indexing synchrotron X-ray diffraction data and subsequent combined Rietveld refinement on neutron and synchrotron X-ray diffraction data revealing significant disorder on the A-sites of these materials. A...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Michelle R. Dolgos Two perovskite materials (Bi0.5(A)0.5)(Sc0.5Nb0.5)O3, where A = K

Synthesis and Characterization of Alkylammonium Salts of Butyltin-Polyoxotungstates for Thin Film Functionalization

Creator:: Olsen, Morgan R.
Abstract:: Metal-oxo clusters are discrete, soluble pieces of bulk metal oxide. Cluster size, monodispersity, and chemical properties allow for potential use as solution-based precursors for functional metal oxide films. Classical monoalkyltin-oxo clusters are either charge neutral or stabilized by anions. The structure of Cs₄.₅H₂.₅[(BuSn)₃(α-SiW₉O₃₇)]*2H₂O enables its use in established ion exchange...
Resource Type:: Dissertation
Full Text:: Keggin {K4[RSnOH)(α,β-XW11O38H] (R=Bu; X=Sb, Bi)},[26] tris(organotin)-substituted Keggin {Y[(R3)(α,β

Revealing Ultrafast Dynamics and Functional Basis of Potential Biomedical Tools from Calcium Sensing to Optogenetics

Creator:: Tachibana, Sean R.
Abstract:: Photoactivated biomedical tools like fluorescent biosensors and optogenetic proteins have increased in popularity due to the precision targeting and activation used for in vivo applications. In nature, the initially discovered parent proteins exhibit properties such as fluorescence quantum yield (FQY), fluorescence color, and photoswitching dynamics that are unfavorable in mammalian...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Sean R

Galvanostatic control of ion selective electrodes with the solvent polymeric membrane

Creator:: Perera, Hasini R.
Abstract:: Detection technique that proposed utilizing electrochemically controlled, reversible ion extraction into polymeric membrane in an alternating galvanostatic/ potentiostatic mode was introduced. This method is studied in detail to comprehend the advantages of the novel sensor (pulstrode) compared to the potentiometric ion selective electrode (ISE), studies included possible applications and limitations....
Resource Type:: Dissertation
Full Text:: 1 AN ABSTRACT OF THE DISSERTATION OF Hasini R. Perera for

ScholarsArchive@OSU

Synthesis of novel ambifunctional atropisomeric 2,2',6,6'-tetrasubstituted biphenyls and investigation of their properties and organocatalytic activity

Part I: Total Syntheses of Mandelalide A and Isomandelalide A. Part II: Role of π-Stacking on Sharpless Dihydroxylation of cis-Enynes: Synthetic Studies Toward All Carbon Macrocyclic Mandelalide B

Substitutional Effects on the Electromechanical Properties of Lead-free, Piezoelectric (Na₀.₅Bi₀.₅)TiO₃-BaTiO₃ (NBT-BT)

Stereospecific Synthesis of Stereotriad Motifs and Alkenes Using Enantioenriched sp³-Hybridized Carbenoids

Development of Methods for Stereoselective Carbon-Carbon Bond Formation

Preparation and characterization of polymer-SiO₂ hybrids

Structure-Property Relationships of Disordered Electronic Materials : From Crystalline to Amorphous

Synthesis and Characterization of Alkylammonium Salts of Butyltin-Polyoxotungstates for Thin Film Functionalization

Revealing Ultrafast Dynamics and Functional Basis of Potential Biomedical Tools from Calcium Sensing to Optogenetics

Galvanostatic control of ion selective electrodes with the solvent polymeric membrane

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