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 35 for “"Hydroxyls"”.
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Molecular modeling studies on the reduction of inososes and deoxy-inososes: a synthetic and historical overview of the cyclitols
… containing six-membered rings that have five hydroxyls (four for the deoxyinososes) and a carbonyl. Due to the relative ease of their reduction to inositols, a study aimed at the potential preparation of these useful natural products was undertaken. The constitution of the hydroxyls shows that …
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The effects of heating and dehydration on the crystal structure of hemimorphite up to 600{u00B0}C
… positional shifts, especially those of the hydroxyls which are no longer hydrogen-bonded to a water molecule. The hydroxyls move towards the position occupied by the water molecule prior to dehydration. The effects of dehydration on the crystal structure of hemimorphite were to found to be …
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Determining the Crystal Structure of Cellulose III by Modeling
… structure. Combinations of the O2, O3, and O6 hydroxyls produced 54 starting structures. Clusters of 13 cellotetraose chains terminated by methyl groups for each of the 54 starting structures were optimized with MM3(96). Hydroxyl groups on 16 of these 54 structures reoriented to give very …
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Development and implementation of nanoscale materials in engineering applications
… is that the C60 are still functionalized with hydroxyls reducing the hydrophobicity of the surface and a possible defunctionalization procedure is identified which does not affect the amide bonds but reduces the hydroxyls. The second is the possibility of using larger particles to make …
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The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5
… of the alkoxy groups of TEOS with the terminal hydroxyls of the zeolite under the formation of ethanol.
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Mechanistic tracer studies of a synthetic mica-montmorillonite: n-butene isomerizations
… it is hypothesized that the circumferential hydroxyls are sites of high catalytic activity.
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Spectroscopic Studies of Small Molecule Adsorption and Oxidation on TiO2-Supported Coinage Metals and Zr6-based Metal-Organic Frameworks
… was employed to characterize the intrinsic µ3-hydroxyls and molecular-level defects associated with the metal-organic framework (MOF), UiO-66. The adsorption of CO onto heterogeneous surfaces effectively characterizes surfaces because the C-O bond vibrates differently depending on the nature of …
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Fluorous- Phase Synthesis of Heparan Sulfate Disaccharides & Low-Molecular Weight Additives for Enhancing the Performance of Lithium-Ion Batteries.
… system, to enable the controlled unmasking of hydroxyls or amines for subsequent sulfonation. A practical challenge of this approach is the need to carry highly polar intermediates through multiple synthetic steps. This was addressed by installing a perfluoroalkyl (fluorous) tag on the reducing …
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Direct detection of homocysteine and syntheses of lanthanide complexes as biosensors
… of Eu3+ with proximal oligosaccharide hydroxyls play important roles in the signal transduction.
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Interactions of hydrogen with alkali promoted Ru/SiO2 catalysts: a proton NMR study
… one-to-one basis. The exchange efficiency of the hydroxyls decreased with increasing atomic size of the alkali metal (Na > K > Cs). An additional downfield proton resonance was detected for all the alkali promoted catalysts which was assigned to the alkali hydroxide species present in the …
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Computer-aided design and synthesis of 5,7-dihydroxyflavone derivatives as glycogen phosphorylase inhibitors
… identified that using methyl protection of the hydroxyls at the 5 and 7 position in parallel with the Baker-Venkataraman re-arrangement managed to achieve high purity initial compounds with a relatively good yield. The procedure is now ready to be employed to synthesize all other predicted …
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Understanding the catalytic activity of oxides through their electronic structure and surface chemistry
… The strength of interaction with hydroxyls correlates inversely with activity, illustrating detrimental effects of strong water interactions at the catalyst surface. This fundamental insight brings molecular understanding to the wetting of oxide surfaces, as well as the role of …
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Catalytic Decomposition of a Perfluorinated Carbon Proxy Using Alumina-based Catalysts
… At elevated temperatures (>400 ℃), the surface hydroxyls are released which creates coordinatively unsaturated sites (CUS) on the surface. The surface of potential catalysts were then analysed to quantify the acid sites on the surface of the catalyst (as catalysis is believed to be underpinned …
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Synthesis and cytotoxity of oxysterols:studies on the A,B ring polyoxygenated sterols
… showed the interaction between the existing hydroxyls or acyls with the reaction centre often resulted in different products. The allyl oxidation, epoxidation and Epoxide ring opening reactions are investigated with these cholest-2-enes.
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Development of site-specific RNA labeling strategies to probe alternative RNA splicing
… by the installation of acetates on the 2'/3' hydroxyls and attempts to protect the exocyclic amine on guanosine as the phenoxyacetamide. The installation of a pyrazole moiety via Suzuki-Miyauraprotocol using the corresponding boronic acid pinacol ester described in Chapter 3 is presented. The …
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The effect of oxygenates on the oligomerisation of propene over zeolite ZSM-5
… complex for acetic acid and the surface hydroxyls has been proposed in which the bond angles and lengths of the molecule are similar to those observed in the formation of the acetic acid dimer, consistent with the proposed strong adsorption.
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Surface Interactions of Diborane
… irreversible reaction of diborane with surface hydroxyls is only possible in the presence of a second nucleophile (such as adventitious water). On the metal-organic framework (MOF) UiO-66 NH2, unique chemistry was observed in which diborane reacted with the –NH2 groups of the MOF linkers, …
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Selective Recovery of Rare Earth Elements using Green Foam Flotation
… showed that the binding of La3+ with anions (hydroxyls or surfactants) depends on the aqueous condition around the La3+ ion. Hence, our results point to great potential for using foam flotation for REE extraction as an alternative to the industrially standard solvent extraction method.
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Selective dehydration of polyols over solid acids and metal-acid bifunctional catalysts: Towards a catalytic toolbox for rational catalyst design
… either in the form of eliminating undesired hydroxyls in order to end at a linear molecule (such as 1,6-hexanediol), or in the form of selectively forming a ring structure by converting to hydroxyl groups on a polyol to a cyclic ether (such as the conversion of sorbitol to isosorbide). Both …
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