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 26 for “"oxidative coupling"”.
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Studies of Novel Transition-Metal-Catalyzed Oxidative Coupling Reactions
Transition-metal-catalyzed oxidative coupling reactions are important tools for the construction of carbon-carbon (C-C) and carbon-heteroatom (C-X) bonds from simple starting materials. A series of novel and synthetically useful reactions have been developed and are herein described.
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Structure-Function Relationships in Poly(3-hexylthiophene)s Formed via Manipulation of Oxidative Coupling Routes
… materials by MALDI-Tof-MS analysis. Chemical oxidative polymerization remains the most popular and wide-spread method for the preparation of P3ATs, due to the method’s affordability, ease, and ability to form large yields of high mass polymer. Therefore, the ability to utilize this synthetic …
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Evaluation of alkali and alkaline earth doped samarium oxide catalysts for the oxidative coupling of methane
The catalytic oxidative coupling of methane involves the reaction of methane and oxygen at high temperatures (650°C to 900°C) in the presence of a solid metal oxide catalyst to produce the desirable products, ethane and ethylene, as well as the undesirable products, carbon monoxide and carbon …
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Application of density functional theory and machine learning in the prediction of efficient catalysts for the oxidative coupling of methane with reduced CO2 production at low temperature
The oxidative coupling of methane (OCM) remains a promising means for the production of ethylene. Though high temperatures of 900 oC and above lead to increased conversion of methane, at higher temperatures, the OCM reaction tends to favour a competing reaction that leads to the production of COx …
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Reversible and irreversible adsorption of naphthalene and α-naphthol to soil
… biologically-mediated and chemically-induced oxidative coupling, and rate-limited diffusive processes contributed to the apparent irreversible adsorption of these compounds. The purposes of this research were to: (1) investigate the processes which cause the irreversible adsorption of organic …
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Spectroscopic and catalytic investigations of transition metal complexes intercalated in layered silicates
… been used in the study of layered silicates. The oxidative coupling of phenols catalyzed by copper complexes intercalated into smectite clay minerals show that this type of reaction can be made very selective, due to the environment of the interlamellar layer of the clay mineral. The oxidation of …
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The study of the asymmetric synthesis of lignans
… alkylation reactions, and intramolecular oxidative coupling reactions. In addition to developing asymmetric synthetic methodologies for chiral lignans, an investigation of chirality in arylnaphthalene lignans which lack stereogenic centers has also been carried out. In the first project, a …
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Development of sorption technology for the cleanup of pesticide contaminated wastewater
… was incorporated through peroxidase catalyzed oxidative coupling reactions. Solid state fermentation of contaminants that can undergo oxidative coupling, may prove an effective detoxification method.
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METHODOLOGY DEVELOPMENT OF N-SULFINYL METALLOENAMINES AND ASYMMETRIC TOTAL SYNTHESIS OF (+)-EPIIBOGAMINE
… and other Iboga alkaloids in future studies. Oxidative enolate coupling, via radical intermediates, was used to construct 1,4-dicarbonyl scaffold from the reaction between two enolate nucleophiles. An oxidative coupling of N-sulfinyl metalloenamines was discovered having the ability to …
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Synthesis, Structural, and Catalytic Studies of Palladium Amino Acid Complexes
… is catalytically active with respect to the oxidative coupling of olefins and phenylboronic acids. Some enantioselectivity is observed and the formation of products not reported in other Pd(II) oxidative couplings is seen. Both activated and non-activated alkenes were oxidatively coupled to …
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Understanding and Controlling the Surface Chemistry of Oxides to Enhance Catalytic Activity at Elevated Temperatures
… (SOEC), ethane cracking, CO oxidation, and the oxidative coupling of methane. In hightemperature catalysis, the gaseous reactants undergo chemical or electrochemical reactions at the surfaces of the oxide catalysts. Therefore, understanding and controlling the surface chemistry of oxides is …
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Development of and gas permeation study of homo and copolymers from the family of polyphenylene oxides
… of different composition were synthesized by oxidative coupling of 2,6-diphenylphenol and 2,6-dimethylphenol; (2) the physical and gas transport properties of the polymers were determined. (Abstract shortened by UMI.)
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Observation of the first titanium alkyl/alkyl complexes: The key intermediate in the Ziegler-Natta mechanism for the polymerization of alkenes
… of the evidence favors a mechanism involving the oxidative coupling of two coordinated ethylenes followed by $\beta$-hydrogen abstraction and reductive elimination. Interestingly, there is no insertion of ethylene into the Ti-CH$\sb3$ bonds. This behavior is probably a general feature of d$\sp2$ …
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Development of novel heterocyclic compounds as vascular targeting agents
… includes a brief overview of palladium catalysed coupling chemistry and a screen for suitable catalytic systems. In chapter three the development of an intramolecular ring closing process for dibenzo[b,d]oxepine is described. This includes investigation into non-phenolic oxidative coupling and a …
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NATURAL POLYPHENOLS AS LEAD COMPOUNDS IN THE SYNTHESIS OF ANTITUMOR AGENTS AND OTHER USEFUL PRODUCTS
… synthesis of new dimers, obtained by biomimetic oxidative coupling of natural polyphenols belonging to the stilbenoid and phenylpropanoid families, namely resveratrol or caffeic acid analogues. To this purpose we employed both chemical and enzymatic methods; in particular, metal-mediated …
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NATURAL PRODUCT INSPIRED METHODOLOGIES: ADVANCES IN DIASTEREOSELECTIVE N-SULFINYL IMINE AND TRIFLUOROPYRUVIC ACID REACTIONS
… worked briefly on developing diastereoselective oxidative coupling with N-sulfinyl imine for the synthesis of (+)-chimonanthine. At the beginning of my fourth year I Joined the Kim lab, where I developed photoredox catalyzed process to synthesize y-lactones. These motifs are found in various …
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Factors affecting binding of chlorophenols to soil
Synthetic substituted phenols can become incorporated into soil organic matter by processes similar to natural humification. Biological, (enzyme-catalyzed), and abiotic, (mineral surface catalyzed), reactions have been implicated in these processes which result in the nonextractable binding of …
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Novel Sulfated 4-Hydroxycinnamic Acid Oligomers as Potent Anticoagulants
… were prepared through peroxidase-catalyzed oxidative coupling of 4-hydroxycinnamic acids. The products resulting from this reaction are called CDs, FDs and SDs. Structurally, these sulfated DHPs are unique and do not resemble any of the anticoagulants known in the literature.DHP oligomers …
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