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 20 of 399 for “"Functional group."”.
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Synthesis and small molecule chemistry of the niobaziridine-hydride functional group
… Reactivity of the Niobaziridine-Hydride Functional Group The synthesis, characterization and reactivity of the niobaziridine-hydride complex Nb(H)([eta]²-t- ]Bu(H)C=NAr)(N[Np]Ar)₂ (la-H; Np = neopentyl, Ar = 3,5-Me₂C₆H₃) is discussed. The niobaziridine-hydride functional group in complex …
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Effects of functional group-specific complexation and adsorption of phytic acid on its degradation by phytase
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Vegetation structure and inferred patterns of functional group attrition in a shrub encroached old field and tallgrass prairie mosaic
… the differences in diversity and species and functional group composition along a gradient of woody encroachment to help gauge restoration potential and gain insights into patterns of disassembly in grassland communities. The study site is a 65 ha (160 acre) tallgrass prairie and old field …
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Plants in urban brownfields: modeling the driving factors of site conditions and of plant functional group occurrence in a dynamic environment
… the species according to their traits into plant functional groups (PFGs) and subsequent modeling, in the first part of the thesis, I identified relevant strategies for species survival. The results revealed that dispersal in space and in time as well as vegetative persistence on sites are most …
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Mass Spectrometric Studies on Lignin Sequencing and Fast Pyrolysis, Functional-Group Selective Ion-Molecule Reactions and Reactivity of Bi- and Triradicals
… kinetics and mechanism and even in probing the functional groups in unknown molecules. The functional group selective ion-molecule reaction has great potential for unknown drug metabolite identification
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MASS SPECTROMETRIC STUDIES ON PETROLEUM ASPHALTENES AND ORGANOSULFUR COMPOUNDS, ON FUNCTIONAL-GROUP SELECTIVE ION-MOLECULE REACTIONS AND ON GAS-PHASE REACTIVITY OF META-BENZYNES TOWARD AMINO ACIDS
Mass spectrometry has found a wide variety of applications in many fields of study, such as fundamental chemistry, biological science, food and fuels, advanced materials, etc. Due to its high sensitivity, selectivity and speed, mass spectrometry provides an invaluable tool for direct mixture …
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Brønsted acid-catalyzed alkylation of tetrazoles with alcohols
… acid, narrow scope, long reaction time and poor functional group tolerance. Recently, we developed a methodology for the alkylation of 5-substituted tetrazoles with benzhydryl and benzylic alcohols in the presence of 5 mol% of a mild Brønsted acid catalyst HBF4 (aq). The developed protocol …
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Direct Brønsted acid-catalyzed functionalization of benzhydryl alcohols and 2-ethoxytetrahydrofuran using potassium trifluoroborate salts
… boron dihalide species thereby resulting in low functional group tolerance. A Brønsted acid-catalyzed carbon-carbon bond forming methodology involving alkenyl- and alkynyltrifluoroborates and in situ generated carbocations has been developed. In the presence of HBF4, we have shown that …
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The crystal landscape and cocrystallization of primary aromatic sulfonamides
… into the crystal landscape of the sulfonamide functional group. In this chapter we critically assess several simple primary aromatic sulfonamides identifying the different motifs present in their crystalline structures. Chapter Three focuses on the design and cocrystallization of sulfonamides …
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Influence of system architecture changes on organizational work flow and application to Geared turbofan engines
… of the architecture result in additional or functional group interactions. The determination of the architecture driven changes in the number of functional group interactions is made first, and then isolation of "novel" functional group interactions is made with the original architecture …
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Investigating the binding mode of azide labelled derivatives of Hoechst 33258 by NMR, UV-Vis and IR spectroscopy
… 33258, with the azide acting as a reporter functional group. Chapter 1 describes both the state of the art, and also what is unknown regarding the processes of association and dissociation of small molecules from dsDNA, and how this project aims to gain a fuller understanding of the dynamics …
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Greener Photoredox-Catalyzed Phosphonations of Aryl Halides
… cost, low reaction selectivity, and low functional group compatibility. Photoredox catalysis has been significantly advanced in the past decade in the pursuit of greener, more sustainable avenues to facilitate desirable reaction transformations under mild conditions. These methods most …
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Cocrystallisation involving the thioamide, amide and imide functional groups
… that incorporated the thioamide, amide and imide functional groups. A particular emphasis was placed on the characterisation of these cocrystals by single crystal X-ray diffraction methods. In Chapter One a summary of the intermolecular interactions utilised in this work and a short review of the …
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Benthic-pelagic coupling : rocky intertidal communities and nearshore oceanographic conditions across multiple scales
… Africa and examine the spatial structure of functional group biomass in relation to wave action and upwelling intensity. Despite between-habitat differences in biomass, most functional groups showed similar regional trends in exposed and sheltered habitats, but weaker non-significant …
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Investigation of transition structure geometries for the transfer of oxygen from heteroatoms to phosphorus
The deoxygenation of a functional group containing an oxygen-heteroatom bond by a trivalent phosphorus compound to give the corresponding deoxygenated substrate and oxidized phosphorus compound is a reaction of synthetic and mechanistic importance. The endocyclic restriction test was utilized in …
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MASS SPECTROMETRIC INVESTIGATIONS OF STRUCTURALLY DIAGNOSTIC ION-MOLECULE REACTIONS AND OF MOLECULAR STRUCTURES OF ASPHALTENES
… ions. Additionally, MS/MS strategies utilizing functional-group or isomer specific ion-molecule reactions have been recognized as a fast and efficient way to identify specific analytes among mixture components. However, the mechanisms of many gas-phase reactions, including dissociation and …
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Catalytic C-H oxidation reactions for the synthesis and diversification of hydroxyamino acid motifs
… sugars is demonstrated. Furthermore, the high functional group tolerance of the reaction enabled late-stage cyclization on a leucine-β-allylglycine dipeptide substrate to install a vinyl oxazolidinone moiety. Mechanistic investigations into the role of the dibutylphosphate co-catalyst revealed …
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