Dissertations / Theses on the topic 'Novel Catalytic System'
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Basak, Puja. "Organic transformations using novel catalytic system." Thesis, University of North Bengal, 2022. http://ir.nbu.ac.in/handle/123456789/4790.
Full textQuanson, Jonathan Luke. "The characterisation of the catalytic activity of human steroid 5α-reductase towards novel C19 substrates." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97057.
Full textENGLISH ABSTRACT: This study describes: • The UPLC-MS/MS analyses and quantification of novel 5α-reduced steroids using response factors. • The kinetic characterisation of human steroid 5α-reductase type 1 (SRD5A1), expressed in HEK-293 cells, towards 11OHA4 and 11OHT and their keto derivatives by progress curve analysis. • The subcloning, transformation and functional expression of SRD5A1 in the yeast expression system, P. pastoris. • The conversion of 11OHA4 and 11OHT and their keto derivatives by SRD5A1 expressed in P. pastoris. • The endogenous enzymatic activity in P. pastoris towards the 5α-reduced metabolites in the 11OHA4- and alternate 5α-dione pathways. • The potential application of P. pastoris as a biocatalyst in the production of 5α- reduced C19 steroids.
AFRIKAANSE OPSOMMING: Hierdie ondersoek beskryf: • Die UPLC-MS/MS analise en kwantifisering van nuut-ondekte 5α-gereduseerde steroïede met behulp van responsfaktore. • Die kinetiese karakterisering van menslike steroïed 5α-reduktase tipe 1 (SRD5A1), uitgedruk in HEK-293 selle, vir 11OHA4 en 11OHT en hul ketoderivate deur middel van progressiekurwe-analise. • Die subklonering, transformasie en funksionele uitdrukking van SRD5A1 in die gis P. pastoris. • Die omsetting van 11OHA4 en 11OHT en hul ketoderivate deur SRD5A1 uitgedruk in P. pastoris. • Die omsetting van 5α-gereduseerde steroïede in die 11OHA4 en alternatiewe 5α-dioon paaie deur endogene ensieme in P. pastoris • ‘n Ondersoek na die toepassing van die gisuitdrukkingstelsel as ‘n moontlike OR potensiële biokatalis vir die produksie van 5α-gereduseerde C19 steroïede.
Paterson, Rachel. "A novel two-ligand system for investigation of signal integration by non-catalytic tyrosine-phosphorylated receptors." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:910f605d-3d7e-4a2c-a33a-d380d9702029.
Full textLu, Xun. "Exploration of novel carbon(II) and carbon(0) catalyst systems for organic synthesis." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22939.
Full textMartinelli, Ada <1993>. "Novel catalytic systems and methidologies for organocatalysis and photocatalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9777/1/Martinelli_Ada_tesi.pdf.
Full textCubbon, Rachel Jane. "Novel nitrogen-phosphorus ligands for asymmetric catalysis." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310817.
Full textPerperi, Evangelia. "A novel continuous homogeneous catalytic process for flourous biphasic systems." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412909.
Full textSchettini, Rosaria. "Novel macrocyclic systems in asymmetric phase-transfer catalysis." Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2422.
Full textIn the great realm of organic synthesis, phase-transfer catalysis (PTC) is a well recognized methodology which plays a key role both in industry and academia research. This process involves reactions that take place between reagents which are located in different phases, for example an inorganic water-soluble reagent and a substrate soluble in the organic phase. Considering the well-defined advantages of asymmetric phase-transfer catalysis as a powerful method for organic synthesis, the aim of this research project is to introduce novel macrocycle systems as new and efficient catalysts in this field. First of all, considering the advantages of the easy synthetic process for the preparation of cyclopeptoids, their well-explored complexation properties and the preliminary study on the application as phase-transfer catalysts, the idea is to deeply investigate their use in PTC. The advantages of the solid phase synthesis, such as the easy purification of the intermediates and the modular nature of the products, make cyclopeptoids ideal candidates for the discovery of new catalytic systems, as it is possible to incorporate a wide variety of functionalities inside the backbone of the macrocycle in an expeditious way. As a consequence, a library of peptoid-based chiral macrocycles of different size, decorated with alternating residues of L-Proline and different aromatic side chains, will be prepared and used for enantioselective alkylation reactions. The scope of this project extends also to the investigation of novel chiral calixarenes. However, in this case, the idea is to exploit the ability of calixarenes to form host-guest complexes with alkali cations. The study is also devoted to further explore the potential of crown ethers in new catalytic processes. The second chapter focus first on the synthesis of novel chiral cyclopeptoids and then on their application in asymmetric phase-transfer alkylations, in particular for the enantioselective synthesis of α-amino acids. Afterwards the application of new designed calixarenes for the same alkylation reaction is described. Finally the application of cyclopeptoidic systems in the enantioselective alkylation of 2-aryl-oxazoline-4 carboxylic acid esters is discussed. The third chapter describes the application of crown ethers in phase-transfer processes. For this purpose a diasteroselective methodology for the synthesis of γ-substituted butenolides by a direct vinylogous Mukayama-Michael reaction has been developed. [edited by author]
L’attività di ricerca svolta dalla Dr.ssa Schettini Rosaria ha riguardato la sintesi e l’applicazione di nuovi sistemi macrociclici nella catalisi asimmetrica a trasferimento di fase. In particolare, il progetto di dottorato è stato incentrato sulla sintesi di nuovi sistemi chirali di natura ciclopeptoidica impiegati come catalizzatori nel campo asimmetrico. Nel corso del dottorato nuovi sistemi calixarenici chirali sono stati impiegati nel medesimo campo. L’ultima parte del progetto ha riguardato l’impiego di catalizzatori facilmente reperibili in commercio, gli eteri corna. Essi sono stati impiegati con successo in una reazione altamente diastereoselettiva. Durante il corso di dottorato, la dott.ssa Schettini Rosara ha seguito costantemente le attività didattiche previste nel progetto. [a cura dell'autore]
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Hardacre, Christopher. "Surface chemistry and catalysis of novel Pt/CeOâ†2 systems." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282862.
Full textAl-Harrasi, Wail Saif Salim. "Novel plasma catalytic systems for Fischer-Tropsch reactions : intensified gas-to-liquid fuel production." Thesis, University of Newcastle Upon Tyne, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578549.
Full textCooper, Colin S. "An investigation of novel materials for the catalytic ozonation of organic compounds in aqueous systems." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309561.
Full textDane, Sarah Barbara Joanne. "Applications and activation of novel ligand systems in oxidation catalysis and Ylide-based organometallics." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708166.
Full textBlack, Elzie Dewayne. "An investigation of a novel phase transfer system - the Omega Phase : the synthesis and [4&2] cycloaddition reactions of chiral 2-phenylpropanthial." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/27308.
Full textAgada, Otokpa C.-M. "Catalytic efficiency of zerovalent iron compounds as paint driers compared with conventional substances: The use of ferrocene and other iron compounds as driers in autoxidative paint systems at ambient and elevated temperatures." Thesis, University of Bradford, 1985. http://hdl.handle.net/10454/3543.
Full textAgada, Otokpa Christopher-Marius. "Catalytic efficiency of zerovalent iron compounds as paint driers compared with conventional substances : the use of ferrocene and other iron compounds as driers in autoxidative paint systems at ambient and elevated temperatures." Thesis, University of Bradford, 1985. http://hdl.handle.net/10454/3543.
Full textYen-LingYeh and 葉妍伶. "The Development of a Novel Meso-Scale Lean Catalytic Thermophotovoltaic System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97048818283561461384.
Full text國立成功大學
航空太空工程學系碩博士班
100
The research is focused on a novel combustor to be used on meso-scale thermophotovoltaic (TPV) devices. In order to overcome problems often encountered in miniature power systems, such as short residence time, heat loss and wall quenching, we propose a novel setup of using platinum as the catalyst as well as the emitter for TPV. It has been pointed out in other research that platinum can emit shorter wavelength at higher temperature than usual, which can be used as the material of an emitter. Moreover, using platinum catalyst can increase combustion temperature by 200°C and theoretically significantly enhance the emission efficiency. The current combustor design consists of a percolated Pt catalyst tube in the TPV combustor to stabilize the flame, enhance combustion and emit high temperature radiation. We used an R type thermocouple and a thermal vedio system (TVS) to measure the tube exit and wall temperature, so that we can identify the flame anchor position and distinguish the brightness. Compared with the backward facing step desigh of a traditional TPV combustor, the proposed percolated hole desigh is proved to have a wider operating range. The proposed combustor is also integrated with the GaSb PV cell, then measure the spectrum and I-V curve. The advantage of the outstanding features of the proposed catalyst TPV combustor is partially verified in the current research and further research in the future is urged.
Yu, Ya-Han, and 游雅涵. "Part I The Application of Novel Bis-N-heterocyclic Carbene–Pd Catalytic System for Transfer Hydrogenation Reaction of Aldehydes and Ketones Part II The Application of Novel Bis-N-heterocyclic Carbene–Pd Catalytic System for Oxidation Reaction of Aldehydes." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/763z63.
Full text國立中興大學
化學系所
106
The novel bis-N-heterocyclic carbene salt 27 used in this study was easy to prepare. The bis-NHC–Pd catalytic system derived from the salt 27 with Pd(OAc)2 in situ can catalyze the reaction in the air and the aqueous phase. In this study, the transfer hydrogenation of aldehydes and ketones was performed in the presence of 5.0 mol% of salt 27 and Pd(OAc)2 when potassium formate (4.0 equiv.) was used as the hydrogen source and EtOH or DMF as a solvent at 80 °C. The corresponding primary or secondary alcohols were obtained in good yields. In addition, the aldehydes reacted with alcohols to obtain the corresponding esters when potassium formate (1.2 equiv.) was used in moderate yield. However, the oxidation of aldehydes raised to form the corresponding carboxylic acid in the presence of 1.0 mol% bis-NHC–Pd catalytic system in good yields. It is worth noting that the oxidation of 4-(trifluoromethyl)-benzaldehyde still gave in good yield when the loading of the catalytic system was reduced to 0.001 mol% from 1.0 mol%. The turnover number (TON) is up to 34000 and the turnover frequency (TOF) is 1417 h-1. In this study, the reduction and oxidation of aldehydes can be successfully catalyzed by the bis-NHC–Pd catalytic system at 80 °C. When a polar organic solvent such as dimethylformamide or ethanol is used, the aldehydes can be reduced to alcohols. The aldehydes can be oxided to carboxylic acid when water is used as the solvent. In addition, these catalytic reactions are completely operated in air. The aldehydes or ketones containing various functional groups, such as olefins, halogen, methoxy, cyano, ketones, are tolerated in the presence of bis-NHC–Pd catalytic system. The oxidations of aldehydes occur at mild temperature and can be carried out with 0.01 mol% loading of the bis-NHC–Pd catalytic system, even on a gram scale. The generality of these methodologies gives it operational simplicity and the potential for use on an industrial scale.
Lai, Yong-Long, and 賴永隆. "Investigation of Novel Low Temperature Atmospheric Pressure Plasma System for Deposition Photo-catalytic TiO2 Thin Film and Light-emitting ZnO Thin Film/Nanorods." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95980137714097913302.
Full text義守大學
材料科學與工程學系碩士班
95
In the conventional low-pressure plasma process, operating gas pressure usually ranges from 1 mTorr to several Torr. If the processing plasma can be generated under atmospheric pressure and included the complicated shape application, it could be used for reducing the material processing cost and wider industries. Therefore, low temperature atmospheric plasma system which contains priorities of low cost, high throughput, more environmental protection, easy installation, widely used in various geometrical substrates, in-line process capabilities, acceptable to treat substrates of large areas and various geometrical shapes, and maintaining the reasonable material characteristics have become to be the promising candidate system of next generation for replacing low-pressure plasma or wet chemical process in the future. The purpose of this work is to develop a novel low temperature atmospheric pressure (AP) plasma system and use the system to deposit photo-catalytic TiO2 thin film and ZnO nanorods. In this study, we used titanium isopropoxide (TIP) and 2M Zn(NO3)2 aqueous solutions as precursors for TiO2 thin film and ZnO nanorods, respectively. The precursor was vaporized by ultrasonic oscillator, and moisture of precursor was introduced into plasma reaction quartz tube by argon carrier gas. The main plasma working gas is argon mixed with O2. At the same time, the optimum results indicated the parameters of the AP plasma system are the TIP precursors flow rate/oxygen flow rate of 20 sccm/200 sccm for TiO2 thin film at 500℃ and the Zn(NO3)2 precursors flow rate/oxygen flow rate of 70 sccm/37 sccm for ZnO nanorods at 300℃, respectively. The relationship between material and optical characteristics of titanium oxide (TiO2) photo-catalytic films and zinc oxide (ZnO) films mixed with nano-rods structures were analyzed in this study. It is found that titanium oxide films possessed more columnar structure and larger specific surface area would result in better photo-catalytic characteristics. However, it is revealed that zinc oxide films had higher nano-rods density would lead to more visible light emission.
Machado, Bruno Alexandre Fernandes Ribeiro. "Novel catalytic systems for the selective hydrogenation of a,B-unsaturated aldehydes." Doctoral thesis, 2008. http://hdl.handle.net/10216/13471.
Full textMachado, Bruno Alexandre Fernandes Ribeiro. "Novel catalytic systems for the selective hydrogenation of a,B-unsaturated aldehydes." Tese, 2008. http://hdl.handle.net/10216/13471.
Full textBahutski, Viktar. "Development of Viable Synthetic Approaches to Highly Functionalized Small Ring Systems - Synthesis of Novel Cyclopropylacrylates as Monomers for Low-Shrinkage Polymer-Composites." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B0A8-E.
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