Global ETD Search
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Showing 1 to 20 of 27 for “"catalysed reactions"”.
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Oxo-metal catalysed reactions of unsaturated alcohols
… for a number of synthetically important reactions is described. The ability of alkyl hydroperoxides to epoxidise alkenes in the presence of transition metal catalysts is well known and is reviewed here along with the more conventional methods of preparing epoxides in the laboratory, with …
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Microwave effects on some zeolite catalysed reactions
… had beneficial effects on heterogeneous catalysed reactions. Microwave irradiation should be able to activate specifically the actual catalytic sites and hence could be used to affect reactions where the bulk of the catalyst, the reactants and products are transparent to microwaves. …
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Gold-catalysed reactions of Nitrogen containing molecules
The development of several new gold-catalysed reactions are described. Two new strategies have been employed to access pyrroles by the cycloisomerisation of alkynyl aziridines, and the formation of α,β-unsaturated imides by the oxidation of ynamides has been developed. A rare gold-mediated …
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The chemistry of British bituminous coals : an assessment of phase transfer catalysed reactions in the determination of coal structure
… to bring about selective high conversion reactions, under mild conditions, (often in the past, severe reaction conditions have had to be used to degrade the coals, this in turn resulted in the loss of much of the structural information). We have applied a variety of physical and chemical …
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The Application of sSPhos as a Chiral Ligand in Palladium-Catalysed Reactions: Arylative Dearomatisations, and Heteroarylative Cyclisations with Alkenes
Pd(0)-catalysed arylative dearomatisation of phenols generates complex stereocentre-containing products from simple planar phenols. The first half of this thesis will summarise our efforts to develop general enantioselective variants of these methods. The second half of this thesis focuses on the …
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Novel synthetic methodology employing transition metal catalysed reactions of α-diazo-β-keto sulfonamides and α-cyano-α-diazoacetates; the impact of substituents on the reaction pathway
… designed to investigate rhodium- and copper-catalysed intramolecular C–H insertion, the α-cyano-α-diazoacetates and α-arylsulfonyl-α-diazoacetates probed intramolecular aromatic addition. The precise impact of the substituents of an α-diazocarbonyl compound, on the ensuing rhodium- and …
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Development and Mechanistic Investigation of Indium(III)-Catalysed Hydrosilane Reduction of Imines
… how enantioselectivity is induced in specific reactions is a powerful time-saving tool for organic chemists. By investigating the reaction pathway, specifically the enantiodetermining transition state, factors that result in an increased energy difference between the two enantiomeric transition …
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The Development of Asymmetric Palladium-Catalysed Transformations Using Chiral Sulfonated Phosphine Ligands
… to induce enantioselectivity in palladium-catalysed reactions using sulfonated phosphine ligands. Firstly, a library of achiral sulfonated phosphine ligands that are ion-paired with a chiral cation were synthesised. These ligands only had modest success in a selection of transition metal- …
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AMIDYL RADICALS IN LIGHT PROMOTED REACTIONS
… selected literature example to compare light catalysed reactions with and non-light catalysed reactions. The nitrogen radicals are introduced and classified in Chapter 1.2 with an historical overview of the previous literature work, while Chapter 1.3 reports the main advantages to perform a …
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Shining light on food microbiology; applications of luciferase-tagged microorganisms in the food industry
… organisms as a result of a number of enzyme catalysed reactions caused by enzymes termed luciferases. The lux genes responsible for the emission of light can be cloned from one bioluminescent microorganism into one that is not bioluminescent. The light emitted can be monitored and quantified …
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Characterization of acidic and basic properties of heterogeneous catalysts by test reactions
… their active sites can be done by catalytic test reactions. In contrast to acid catalysed test reactions which are actually well understood there is a need to study base catalysed reactions in detail. Therefore reactions in gas phase like conversion of methyl butynol (MBOH) and isopropanol and in …
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Tertiary alkylamines as effective directing groups for palladium-catalysed C(sp3)–H activation strategies
… to direct C–H cleavage on a series of palladium-catalysed reactions. The work reported in this dissertation describes the development of a new palladium-catalysed strategy towards the functionalisation of aliphatic tertiary amines. Methyl, methylene, and methine C–H cleavage have been disclosed …
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The Laccase from Micromonospora sp.044 30-1 as a biocatalyst for synthesis of antioxidant compounds
… and industrial sectors, are the laccase-catalysed reactions providing means for the synthesis of dimeric phenolics showing biological activity, including antioxidant activity. The objective of this research was to investigate the production of value-added compounds, with biological …
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Novel materials for membrane separation processes
… studies to assess the viability of enzyme catalysed reactions. Chemical synthesis involved the epoxidation of a number of unsaturated carboxylic acids and the subsequent reaction of these epoxy acids with cis-DHCD in DCC/DMAP catalysed esterifications. The silylation of cis-DHCD using TBDCS …
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Neue Heterazoliumsalze aus Prolin und Pyroglutaminsäure und Anwendungen in Carben-katalysierten asymmetrischen nucleophilen Acylierungen
… that the catalytically active species of these reactions is a nucleophilic carbene. Consequently, enzyme mimetic asymmetric catalytic processes that are mediated by nucleophilic carbenes in vitro as, for instance, the benzoin condensation, the Stetter and other related nucleophilic acylation …
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A kinetic template effect in arylphosphonium salt formation.
… involvement of aryl-metal intermediates in such reactions is also discussed. Chapter Two is concerned with the design and synthesis of potential template molecules. A model is proposed for the features necessary in the template substituent in terms of the nature and position of the donor atom or …
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Catalyst and substrate effects in enantioselective C–H insertion reactions of α-diazosulfones
… and synthetic aspects of intramolecular reactions of a series of α-diazo-β-oxo sulfone derivatives using copper and, to a lesser extent, rhodium catalysts. The key reaction pathways explored were C–H insertion and cyclopropanation, with hydride transfer competing in certain instances. …
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Exploiting activated esters in novel chemoselective amide formation reactions
… studies performed on the preparation of lipase catalysed activated esters and their subsequent use in the synthesis of pharmaceutically relevant amides. It also includes the application of activated esters in chemoselective amide formation reactions. The introduction summarizes the significance …
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The Design and Application of Ion-paired Ligands to Address Selectivity Challenges in Transition Metal Catalysed Oxygen and Nitrogen Transfer Reactions
Asymmetric transition metal catalysed reactions are commonly used to access enantioenriched compounds. Classical approaches in this field involve the use of chiral ligands on the metal to induce asymmetry and whilst a well-proven approach to enantiocontrol, it is not universally applicable. Our …
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Charakterisierung der Proteinkinase DYRK1A : Substrat- und Autophosphorylierung
… mitosis and cell differentiation. Studying the catalysed reactions of phosphorylation is one way to get more information about the molecular function of protein kinases. DYRK1A phosphorylates substrates on serine/threonine residues, whereas autophosphorylation of serine/threonine residues as …
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