Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"chirality transfer"”.
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Chirality Transfer in Acyclic Allylic Systems and New Pd-Catalyzed Heck Reaction/C-H Activation Cascades
In the first part, the use of chirality transfer in acyclic allylic systems was assessed for an intra- and an intermolecular reaction. The thermal [2,3] sigmatropic rearrangement of acyclic allylic phosphinites proved to be highly enantioselective, even at 110 °C and led to enantiomerically pure …
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DESIGN AND SYNTHESIS OF FERROIC HYBRID ORGANIC-INORGANIC PEROVSKITES
… of symmetry through lattice distortion or chirality transfer, thereby enabling the coexistence of diverse ferroic behaviors. However, the design principles for engineering one or multiple ferroic orders and their cross-coupling mechanism remain less understood. This thesis presents a …
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Amine Nucleophilic Addition to Nitro-alkene as a New Reaction Mode for the Synthesis of N-heterocycles
… Synthesis of Piperidines by Exocyclic Chirality Transfer: Piperidines are very important structural moieties contained in a wide range of biologically active and medicinally significant compounds. An efficient route to chiral piperidines was developed which involved diastereoselective …
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Chiral Polymer Photodetector
… limonene induced polymer films. As a result of chirality transfer, Cotton effects are also observed in these photodetectors’ CD spectra. A model is suggested to explain the chirality generation of the polythiophene with chiral alkyl side chains and limonene induced achiral polymers.
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New Methods For The Synthesis Of Oxygen And Nitrogen Containing Heterocycles
… was achieved using chirality transfer characteristic of a [1,3]- sigmatropic rearrangement. This method was further tested by completing the total synthesis of natural products goniothalesdiol and varitriol.
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Probing Plasmon-Molecules Interactions with Surface-enhanced Raman Spectroscopy: Towards the Guided Design of Plasmonic Photocatalysts
… I will discuss my investigation of the energy transfer processes in the plasmonic-molecules systems on the ultrafast and steady state timescales with surface-enhanced Raman thermometry. Our results reveal that following the initial transient energy deposition, there is a quick energy …
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Asymmetric synthesis involving silicon
… aziridines have been isolated by a multi-stage chirality transfer from their precursor diol involving no racemization. The main routes for these chirality transfers were via silylated cyclic sulphite or sulphate intermediates and via silylated cyclic ortho esters and halohydrin derivatives. The …
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Synthesis of multicyclic ring systems including an alternate route to Meyers’ lactam derivatives
… atroposelection through a central C5 to axial chirality transfer. The aim of this project will be directed towards the design of alternative strategies in the synthesis of keto-ester Meyers’ lactam derivatives. Leading on to provide new atropos derivatives bearing different substituents to …
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Total synthesis of 19,20-epoxydocosapentaenoic acid-ethanolamide (19,20-EDP-EA) and strategies towards the total synthesis of malabaricane triterpenoids
… we were able to confirm our hypothesis that the chirality transfer feature of the Au(I)-catalyzed Rautenstrauch rearrangement as utilized in the syntheses of isomalabaricanes rhabdastrellic acid A and stelletin E was also dependable for the synthesis of the malabaricane core. On the other hand, …
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New methods for the asymmetric synthesis of α-alkylated ketones and 1,3-amino alcohols
… α-alkylated ketones using an intermolecular chirality transfer methodology. This approach employs the use of simple non-chiral dimethylhydrazones and their asymmetric alkylation using the chiral diamine ligands, (+)- and (-)-sparteine. The methodology described represents the first example of …
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Inducing Chirality in CdS Nanocrystals with Biomolecules
… exchange with cysteine has been shown to induce chirality in CdE NCs, no prior studies have demonstrated the use of intrinsically chiral biomolecules, like peptides and proteins, to generate chiroptical responses in these materials. Chapter 1 reviews the synthetic tunability of CdE NCs and …
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Electronic Structure Based Investigations of Hybrid Perovskites and Their Nanostructures
… by the author helped to attribute the chirality transfer between organic cations and inorganic substrate to the geometric distortions driven by hydrogen bonds. Third, the author investigated 2D hybrid perovskites containing oligoacene organic cations, validated the theoretical method …
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Diastereoselective aza-cope rearrangement-mannich cyclizations of conformationally mobile iminium cations
<p>We have developed a Lewis-acid catalyzed, diastereoselective aza-Cope rearrangement— Mannich cyclization (ACM) to form acyl pyrrolidines from conformationally mobile substrates. Earlier studies from our lab have shown that substituted acyl pyrrolidines can be synthesized with …