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.
Results
Showing 1 to 20 of 150 for “"Nitrogen Containing"”.
-
Novel nitrogen containing polymers via Reissert chemistry
… or synthesis of diamines and dicarboxylic acids containing the trans cyclohexyl moiety. Novel aromatic diamine based bis(α-aminonitrile)s were synthesized from commercially available diamines and are currently being used in the syntheses of post-reaction modifiable co-polyamides. A novel and …
-
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 …
-
Catalytic supercritical water oxidation of nitrogen-containing organic compounds
… water of two non-biodegradable and highly toxic nitrogen-containing organic compounds (DBU and quinoline) are presented. The reactions were studied in a tubular xed-bed reactor over three catalysts: Pt/Al\(_2\)O\(_3\), CuO/Al \(_2\)O\(_3\) and MnO\(_2\)/CuO. The effect of operating conditions, …
-
Transition Metal-Catalyzed Preparation and Functionalization of Nitrogen-Containing Heterocycles
The formation of carbon-carbon bonds is the single most fundamentally important operation in synthetic organic chemistry. Arguably, the aldol and Diels-Alder reactions stand as the most significant advances in forging linkages between carbons of an sp3-hybridized nature. Beginning in the early …
-
Radical decarboxylation strategies for the synthesis of nitrogen-containing heterocycles
Nitrogen-containing heteroaromatics are ubiquitous in nature. In addition, 75% of FDA-approved drugs currently on the market are based on these compounds, establishing them and their analogues as a primary source of therapeutic agents in the pharmaceutical industry. The structural complexity …
-
Supercritical fluid chromatography of nitrogen-containing compounds on packed columns
The separation of basic nitrogen-containing compounds has been investigated via supercritical CO₂ and 1% methanol modified CO₂. Packed columns with the following stationary phases were employed: silica, octadecyl (C₁₈), propylamino (NH₂), and polystyrene-divinyl benzene (PRP). Without modifier the …
-
New Methods For The Synthesis Of Oxygen And Nitrogen Containing Heterocycles
… ring expansion of vinylaziridines produces nitrogen containing heterocycles commonly found in pharmaceuticals and natural products. This reaction is described from its initial discovery, through optimization, to application. Many substitution patterns and functional groups were tested and …
-
Methodology investigations for the synthesis of biologically important nitrogen-containing heterocycles
… for the efficient synthesis of two nitrogen-containing heterocyclic molecules are described; these molecules represent a significant portion of the natural and pharmaceutical world with functions implied in almost all biological processes, hence the necessity for their effective …
-
Spectroscopic characterization and photochemistry of nitrogen-containing molecules relevant to Titan's atmosphere
… transformation of the isonitrile group to other nitrogen-based functionalities.<em>p</em>DIB was found to have a excitation spectrum dominated by Herzberg-Teller vibronic coupling to a nearby second electronic excited state, and the S<sub>0</sub>-S<sub>1</sub>origin was found to be weak, due to …
-
THE STUDY OF THE DISSOLVED NITROGEN CONTAINING MACROMOLECULES IN THE MARINE ENVIRONMENT
… was not suitable for estuarine or other waters containing high nitrate levels, due to the occurrence of oxidative losses. The seasonal relationship between the dissolved combined and the dissolved free amino acid levels and compositions , both at surface and at depth in the coastal waters of …
-
A Study of Novel Nitrogen-Containing Quinoidal Electrolytes for Redox Flow Batteries
… electrolytes have involved a variety of metal-containing and organic systems. Organic systems can offer fast kinetics, high tunability and low cost. In this thesis, novel quinone derivatives were synthesised and investigated as potential electrolytes for organic aqueous RFBs. The first research …
-
Selective production of nitrogen-containing compounds via a modified Fischer-Tropsch process
… ammonia during the FTS leads to the formation of nitrogen-containing compounds (NCCs). Recent studies on the addition of ammonia to the FTS process, now known as the Nitrogen Fischer-Tropsch (NFTS) process, reported that the production of NCCs during the NFTS process is enhanced by the presence of …
-
Nitrogen-containing compounds from ammonia co-feed to the Fischer-Tropsch synthesis
… this work investigates the synthesis of nitrogen containing compounds via ammonia addition to a low temperature, low pressure, slurry reactor using an unsupported, potassium-promoted, precipitated iron catalyst. The process is subjected to various ammonia contents in the feed.
-
Evaluating Nitrogen Containing Controlled Release Fertilizers At Stand Establishment In Loblolly Pine
The response of loblolly pine (Pinus taeda L.) to fertilization and weed control at stand establishment, using various formulations of conventional and controlled release N fertilizers was evaluated in a greenhouse study and at two field trials in the Virginia Piedmont, in 2002 and 2003. The …
-
Late-stage C(sp3)–H hydroxylation, amination, and methylation in nitrogen-containing molecules
Direct installation of oxygen, nitrogen, and methyl functionalities into C(sp3)–H bonds is a topic of significant synthetic and medicinal interest. These modifications have the potential to drastically change a molecule’s physical and biological properties, which could lead to the discovery of new …
-
Synthesis and Applications of Boron-Carbon-Nitrogen Containing H-rich Compounds as Hydrogen Carriers
Hydrogen-rich compounds containing boron (B), nitrogen (N), and carbon (C) have attracted wide research attention for hydrogen storage. Borane-amine complexes are among the most promising candidates, but so far all the reported systems have various drawbacks. This PhD project invented a novel …
-
Asymmetric Synthesis of Nitrogen Containing Bioactive Compounds via the Utilization of Enantiopure p-Toluenesulfinimines
… building blocks for the asymmetric synthesis of nitrogen-containing biologically active molecules, such as pyrrolidines, piperidines and other alkaloids. To further illustrate the utility of sulfinimine -derived enantiopure N-sulfinyl anti- α-lkyl β-amino ketones, they was applied to the …
-
Electrical and electrochemical properties of nitrogen-containing tetrahedral amorphous carbon (ta-C) thin films
… and Electrochemical Properties of Nitrogen-Containing Tetrahedral Amorphous Carbon(ta-C) Thin-Films ByXingyi YangTetrahedral amorphous carbon (ta-C) is a diamond-like carbon (DLC) material comprised of a mixture of sp2 (~40%) and sp3-bonded (~60%) carbon domains. The physicochemical …
-
<em>Ab Initio</em> Studies of High Temperature Pyrolysis Mechanisms in Heterocyclic Nitrogen-Containing Compounds.
… circles (especially those coal constituents containing nitrogen). Most methods of burning coal that are efficient involve doing so at high temperatures. This invariably results in a large portion of non-combusting coal being heated to high temperatures also causing pyrolysis of the original …
Page 1 of 8