Дисертації з теми "Hydrogen-Bonding Catalysis"
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Taylor, Russell Alan. "Hydrogen bonding effects in homogeneous catalysis." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500138.
Повний текст джерелаTossell, Katie Jayne. "Catalysis of phosphate ester hydrolysis through hydrogen bonding." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578696.
Повний текст джерелаJones, Christopher Raymond. "Hydrogen bonding : from conformational control to asymmetric catalysis." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611778.
Повний текст джерелаSnowden, Timothy Scott. "Hydrogen bond involvement in carbon acid pKa[subscript] shifts and intramolecular general catalysis /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008444.
Повний текст джерелаBrown, Christopher John. "Efficient intramolecular general acid catalysis." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/272266.
Повний текст джерелаWhite, M. S. "Reactions and laser activation of carbon acids in hydrogen bonding environments." Thesis, University of York, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372762.
Повний текст джерелаPan, Yongping. "Characterization of Low Barrier Hydrogen Bonds in Enzyme Catalysis: an Ab Initio and DFT Investigation." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc278586/.
Повний текст джерелаBrown, Adam Ross. "I. Engaging Cationic Intermediates in Asymmetric Catalysis: Enantioselective Reactions of Carbenium Ions and N,N-Dialkyliminium Ions II. Enantioselective Catalysis of the Cope-Type Hydroamination by H-Bond Donors." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11009.
Повний текст джерелаChemistry and Chemical Biology
McGrath, Jacqueline. "Advances in Supramolecular Catalysis: Studies of Bifurcated Hamilton Receptors." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/19691.
Повний текст джерелаGoudreault, Alexandre. "Roles for Nucleophiles and Hydrogen-Bonding Agents in the Decomposition of Phosphine-Free Ruthenium Metathesis Catalysts." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40042.
Повний текст джерелаEngle, Keary Mark. "Ligand-accelerated catalysis in palladium(II)-mediated C-H functionalisation ; Hydrogen bonding effects on the reactivity of fluoride anion." Thesis, University of Oxford, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711664.
Повний текст джерелаKwong, Lam Elwood. "Investigating the Role of the Proximal Cysteine Hydrogen Bonding Network and Distal Pocket in Chloroperoxidase." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3898.
Повний текст джерелаPfeifer, Lukas. "New methods and reagents for carbon-fluorine bond formation." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:fe082120-eae7-4299-a349-0d42401ff501.
Повний текст джерелаLi, Yan. "Switchable and chirally-amplified helices formed by hydrogen-bonded supramolecular polymers for asymmetric catalysis." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS223.pdf.
Повний текст джерелаBenzene 1,3,5-tricarboxamide (BTA) supramolecular helical polymers were utilized as a dynamic and chirally-amplified scaffold for copper catalysts implemented in the asymmetric hydrosilylation of 1-(4-nitrophenyl)ethanone. The catalytic helices are composed of a phosphine-functionalized BTA ligand and of enantiopure BTA comonomers. We have developed the switchable ability and improved the chirality amplification properties of this new class of BTA helical catalysts. Firstly, we successfully switched the handedness of the helices in real time by changing the nature of the major enantiopure comonomer in the co-assemblies. Then it allows controlling the configuration of the stereogenic centres formed during the consecutive transformation of a single substrate or a mixture of subtrates. Secondly, the helical co-assemblies are disrupted and restored by adding suitable salts, which switch the catalytic outcome between non-selective and selective states in a reversible manner. Thirdly, the extent of amplification of chirality in the helical co-assemblies as probed by the sergeants-and-soldiers effect and majority-rule effect are hugely exalted upon incorporation of an achiral BTA additive. Moreover the improvement of the chirality amplification properties by addition of this achiral additive also holds for catalytic BTA mixtures Finally, we investigate the self-assembly properties of N-substituted benzene-1-urea-3,5-biscarboxamide (BUBA) monomers, in which one amide function has been replaced by an urea function. The chirality amplification properties and extent of cooperativity are slightly higher for BUBA monomers, respectively to BTA monomers
Medina, Ramos Jonnathan. "ACID-BASE CATALYSIS IN PROTON-COUPLED ELECTRON TRANSFER REACTIONS (PCET): THE EFFECTS OF BRÖNSTED BASES ON THE OXIDATION OF GLUTATHIONE AND HYDROQUINONE." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2918.
Повний текст джерелаZamboulis, Alexandra. "Silices hybrides pour l'organocatalyse asymétrique." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2010. http://www.theses.fr/2010ENCM0004.
Повний текст джерелаAsymmetric organocatalysis is a blossoming area of research. Immobilisation of this kind of catalysts could present numerous advantages. This thesis deals with the sol-gel synthesis of organic/inorganic hybrid silicas and their applications in asymmetric organocatalysis. The first part of this work is dedicated to a bibliographic presentation of this area of research. In the second part, the use of L-proline as a model is described. Hybrid materials containing a L-proline component were prepared and their catalytic performances were evaluated in an asymmetric aldolisation reaction. The processes accounting for the moderate performances of these materials are discussed. The third part relates the synthetic strategies used to prepare silylated derivatives of the Takemoto catalyst, a bifunctional catalyst containig a H-bond donnor and a tertiary amine. Finally the nanostructuring of bridged silsesquioxanes through H-bonding interactions between thiourea cross-linkers is presented
Jensen, Sean. "The assembly of molecular networks at surfaces : towards novel enantioselective heterogeneous catalysts." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/2153.
Повний текст джерелаBoulens, Pierre. "Sulphonamido-phosphorus nickel complexes for the selective oligomerisation of olefins - Exploring dissymmetric ligands and supramolecular strategies." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0973/document.
Повний текст джерелаThe demand for short linear alpha olefins is constantly increasing and motivates the development of robust and selective catalysts. In this thesis, several libraries of phosphorus ligands with the capacity to form dissymmetric or supramolecular assemblies were synthesized. The variability observed within the aminophosphine libraries, clearly reflected by the various tautomeric equilibrium of the ligand, was also observed in the nickel complexes as a single ligand could generate several complexes with different structures. Sulphonyliminobisphosphine were then introduced as a new class of ligands. These precursors rearrange in the presence of nickel to generate diphosphinamine nickel complexes. Activated by MAO, these complexes are active in the reaction of ethylene oligomerisation and produce short chain olefins. A new approach that forms stable supramolecular nickel complexes was developed by combining two phosphorus ligands with Ni(0). These complexes stabilised by hydrogen bonding are directly active in the reaction of ethylene oligomerisation with some catalysts leading to high selectivity to 1-butene (up to 84%). To understand the origin of that selectivity, the scope of complexes was extended to ligands with different steric and electronic properties. Their evaluation in the reaction of ethylene oligomerisation evidenced a relation between the catalyst structure and the selectivity of the reaction. Mechanistic studies, under an ethylene atmosphere, reveals that cationic complexes rearrange to neutral complexes, which are likely, the active species
D’Agostino, Carmine, Lynn F. Gladden, and Mick D. Mantle. "Hydrogen bonding network disruption in nanoporous catalyst supports probed by PFG-NMR diffusometry and NMR relaxometry." Diffusion fundamentals 16 (2011) 43, S. 1-2, 2011. https://ul.qucosa.de/id/qucosa%3A13778.
Повний текст джерелаD’Agostino, Carmine, Lynn F. Gladden, and Mick D. Mantle. "Hydrogen bonding network disruption in nanoporous catalyst supports probed by PFG-NMR diffusometry and NMR relaxometry." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185020.
Повний текст джерелаZhao, Long Verfasser], Dieter [Akademischer Betreuer] [Enders, and Markus [Akademischer Betreuer] Albrecht. "Organocatalytic asymmetric domino reactions via N-heterocyclic carbene and bifunctional hydrogen-bonding donor catalysts / Long Zhao ; Dieter Enders, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181108926/34.
Повний текст джерелаZhao, Long [Verfasser], Dieter [Akademischer Betreuer] Enders, and Markus [Akademischer Betreuer] Albrecht. "Organocatalytic asymmetric domino reactions via N-heterocyclic carbene and bifunctional hydrogen-bonding donor catalysts / Long Zhao ; Dieter Enders, Markus Albrecht." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1181108926/34.
Повний текст джерелаHobart, David B. Jr. "Synthesis, Structural, and Catalytic Studies of Palladium Amino Acid Complexes." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79719.
Повний текст джерелаPh. D.
Zhugralin, Adil R. "Combined Theoretical and Experimental Investigation of N-Heterocyclic Carbenes as Lewis Base Catalysts and as Ancillary Ligands in Ru-Catalyzed Olefin Metathesis. Mechanistic Investigation of Fluxional Behavior of Ru-Based Olefin Metathesis Catalysts." Thesis, Boston College, 2011. http://hdl.handle.net/2345/2973.
Повний текст джерелаChapter 1. Through the use of quantum theory of atoms in molecules (QTAIM) the similarities and differences between transition metal complexes ligated by phosphines and N-heterocyclic carbenes (NHC) were elucidated. Among the key findings, the phosphines were identified as stronger charge donors than NHCs; however, the latter class of ligands exhibits a weaker p-accepting character than the former. Furthermore, Tolman electronic parameter (TEP) was determined to be an inadequate gauge for the total electron donating ability of phosphines and NHCs; rather TEP can serve as a measurement of population of dp set of orbitals of a metal center in question. Computational and experimental studies of the mechanism of NHC-catalyzed boron and silicon addition to a,ß-unsaturated carbonyls reactions were carried out. Through the use of radical traps the mechanisms involving homolytic cleavage of B-B or B-Si bonds were ruled out. Computational (DFT) studies of the mechanism identified two pathways: (1) direct activation of diboron or borosilyl reagents through coordination of NHC to the B atom, (2) net oxidative addition of the diboron or borosilyl reagents to the carbon (II) of the NHC. The insights gained from the aforementioned studies were employed to rationalize the observed lack of reactivity of NHC-activated diboron complexes in the presence of aldehydes. Chapter 2. New C(1)-symmetric chiral monodentate N-heterocyclic carbenes were prepared, and corresponding chiral Ru-carbene complexes were synthesized. These complexes were employed to gain empirical understanding of factors that govern stereoselectivity in Ru-catalyzed enantioselective olefin ring-closing metathesis. The data thus obtained was employed to infer that syn-to-NHC reaction pathways are competitive and non-selective. One plausible mechanism, through which syn-to-NHC pathways can be accessed, involves Berry pseudorotations. Through the use of stereogenic-at-Ru complexes diastereomeric Ru-carbenes were isolated (silica gel chromatography) and spectroscopically characterized in solution phase. The diastereomeric Ru-carbenes were found to undergo non-metathesis stereomutations at Ru center, thereby providing additional support for the above hypothesis regarding accessibility of syn-to-NHC olefin metathesis pathways. Non-metathesis stereomutation at Ru was found to be accelerated in the presence of protic additives, suggesting the plausibility of hydrogen bonding between the acidic proton and the X-type ligands on Ru. Occurrence of hydrogen bonding was corroborated through the use of chiral allylic alcohols in Ru-catalyzed diastereoselective ring-opening/cross metathesis, which was developed into a versatile method for highly diastereoselective functionalization of terminal olefins
Thesis (PhD) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Dey, Abhishek. "Nature of iron-sulfur bonds in electron transfer and catalytic actives sites : contribution to reactivity and the role of hydrogen bonding /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаErlekam, Undine. "Sterically flexible molecules in the gas phase." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15833.
Повний текст джерелаThe macroscopically observable properties and functionalities of biological matter are often determined by weak intra- and intermolecular interactions on the microscopic level. Such weak interactions are for example hydrogen bonding and van der Waals interactions and can be investigated best on isolated model systems in the gas phase. The benzene dimer, for example, is a prototype system to investgate dispersive interactions. The spectroscopic experiments, covering the energy ranges of rotations, vibrations and electronic transitions, presented in this thesis, contribute to a deeper understanding of the benzene dimer. However, from the experiments investigating the internal dynamics it becomes clear that an appropriate theoretical description of the benzene dimer is still a challenge. Vibrational transitions of highly symmetric molecules, as for example of the benzene, are often optically inactive. Here, a method is presented, which exploits symmetry reduction upon complexation and thus allows one to access such modes. Furthermore, a model is proposed describing collision induced conformational interconversion in a molecular beam. This model can be helpful for molecular beam experiments of flexible molecules to understand the observed relative conformational population and to adapt the experimental conditions allowing for the manipulation of the relative conformer abundances. In this thesis, results are presented that allow one on the one hand to deduce molecular specific information and that on the other hand also give a broader insight into phenomena of general importance.
Ståhle, Jonas. "Computational chemical investigation of factors affecting the reactivity of the hetero Diels-Alder reaction." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94476.
Повний текст джерелаBeeson, John Christopher. "Part 1. Synthesis of novel duplex cyclodextrins and investigations of their catalytic and fluorescence properties. : Part 2. Pi-complexation induced by multiple hydrogen bonding in an organic hexammide /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844485898676.
Повний текст джерелаMerkert, Christine [Verfasser], and Gereon [Akademischer Betreuer] Niedner-Schatteburg. "Metal cluster aggregates of the composition Fen+/, Con+/-, Nin+/- and [ConMm]+/- (M: Au, Rh and Pt) as model systems for catalytic C-H activation and structural determination of ionic dicarboxylic acids as model system for intramolecular hydrogen bonding / Christine Merkert. Betreuer: Gereon Niedner-Schatteburg." Kaiserslautern : Technische Universität Kaiserslautern, 2014. http://d-nb.info/1051310377/34.
Повний текст джерелаKoshti, V. S. "Catalytic synthesis of P-chiral supramolecular phosphines, their self-assembled metal complexes and implication in asymmetric catalysis." Thesis(Ph.D.), 2018. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4492.
Повний текст джерелаCSIR-National Chemical Laboratory, Pune
AcSIR
Huang, Yong. "Exploration of the new horizon of Diels-Adler reactions : asymmetric catalysis /." 2002. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3060222.
Повний текст джерелаTripathi, Chandra Bhushan. "Lewis Base and Hydrogen-Bonding Catalysis by Thioureas : From Chemoselective Alcohol Oxidation to Asymmetric Iodofunctionalizations of Alkenes and Dienes." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/4078.
Повний текст джерела