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Dissertations / Theses on the topic 'Oxonium'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Donohoe, Timothy J. "Chiral oxonium ions." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314854.

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2

Schubert, Jeffrey W. "The structure of bromonium, chloronium, and oxonium ions." Click here for download, 2008. http://proquest.umi.com/pqdweb?did=1537007641&sid=1&Fmt=2&clientId=3260&RQT=309&VName=PQD.

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3

Waterman, James R. "Generation and rearrangement of carbenoid-derived ammonium and oxonium ylides." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439997.

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4

Bouillon, Nelly. "Homopolymérisation des époxy par les complexes BF3-amines." Lyon, INSA, 1988. http://www.theses.fr/1988ISAL0037.

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Le travail présenté concerne l’étude de l’homopolymérisation cationique des époxy amorcée par les complexes BF3- amine en présence d'un diol. La synthèse de différents complexes et leur dissolution dans un diol a permis de montrer l’influence de la basicité de l’amine complexée sur leur réactivité avec un prépolymère DGEBA n = 0,03. Dans un deuxième temps nous avons étudié le mécanisme de polymérisation d'un mono époxy amorcée par le complexe BF3 - 4-chloroaniline en présence d'un poly oxyde d'éthylène glycol de masse 300. La réaction a pu être décrite par la compétition entre deux mécanismes

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5

Bate, Andrea Louise. "Synthesis of carbocycles by rearrangement of oxonium ylides generated from metal carbenoids." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368272.

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6

Guillonneau, Loïc. "Etudes de voies de synthèses du SSR149415." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13346.

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Le SSR149415 est une nouvelle molécule visant à traiter les troubles de l'émotion comme le stress et l'anxiété en ciblant les récepteurs V1b de la vasopressine impliqués dans l'émotivité. Au cours de cette thèse, nous avons cherché à développer une nouvelle voie d'accès originale et efficasse au SSR149415, noyau oxoindole α-α' substitué de configuration (R). [Schéma de la molécule SSR149415 dans le résumé d'origine] Les étapes clés des différentes approches entreprises sont une réation de Petasis suivie, soit d'une α-arylation intramoléculaire d'une fonction ester, soit d'une α-arylation inter

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7

Guerot, Carine. "Construction of carbocycles via oxonium ylides generation and rearrangement : towards the synthesis of taxol." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/645/.

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The diterpenoid natural product Taxol, first discovered in the late 1960’s, is one of the most important current drugs for the treatment of several cancers including breast and ovarian cancers. Although tremendous efforts towards its synthesis have been made in the last two decades, resulting in six elegant total syntheses, Taxol still constitutes a remarkable challenge for organic chemists due to its unique structural framework. The high level of interest has spilled over to our laboratory, the purpose of this thesis was to develop an approach for the construction of medium-ring fused polycar

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8

Fessard, Thomas C. "Stereoselective synthesis of cyclic ethers via a tandem oxonium ylide formation and rearrangement strategy." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416430.

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9

Bray, David. "Cationic ring opening polymerisation (CROP) of oxetane and its derivatives using oxonium derived initiators." Thesis, Aston University, 2009. http://publications.aston.ac.uk/15287/.

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Several cationic initiator systems were developed and used to polymerise oxetane with two oxonium ion initiator systems being investigated in depth. The first initiator system was generated by the elimination of a chloride group from a chloro methyl ethyl ether. Adding a carbonyl co-catalyst to a carbocationic centre generated the second initiator system. It was found that the anion used to stabilise the initiator was critical to the initial rate of polymerisation of oxetane with hexafluoroantimonate resulting in the fastest polymerisations. Both initiator systems could be used at varying mono

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10

Dossetter, Alexander Graham. "An approach to the total synthesis of neoliacinic acid, a highly oxygenated sesquiterpene lactone." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243491.

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11

Walls, Steven B. "The synthesis of medium-ring carbocycles by tandem oxonium ylide generation and [2,3]-sigmatropic rearrangement." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416880.

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12

Hansen, K. Emelie. "Synthesis of O-Heterocycles : the [2,3]-sigmatropic rearrangement of transition metal carbenoid-generated allylic oxonium ylides." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3654/.

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In many natural products, heterocycles, such as cyclic ethers, are important features. While there are many different approaches to the formation of these ethers, there are only a few methods available for the synthesis of substituted cyclic ethers with good diastereoselectivity and even less so with good enantioselectivity. The rearrangement of oxonium ylides has proved to be a versatile method for the stereoselective synthesis of cyclic ethers. However, to date, there is no general efficient enantioselective method for the rearrangement of oxonium ylides. This project aimed to develop an ena

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13

Godoy, Junior Luiz Antonio Fonseca de. "Sintese da 5-monobromocavernicolina e do 3-bromoverongiaquinol : reações de adição de nucleofilos de carbono a ions oxonios ciclicos em sistemas sem solvente." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249253.

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Orientador: Ronaldo Aloise Pilli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-10T06:40:57Z (GMT). No. of bitstreams: 1 GodoyJunior_LuizAntonioFonsecade_M.pdf: 2690329 bytes, checksum: e0dd006f51f8ae2ed9fc689def1c7773 (MD5) Previous issue date: 2006<br>Resumo: A dissertação foi dividida em duas partes, a primeira trata da síntese de produtos naturais isolados de esponjas marinhas e a segunda parte trata de reações de adição de nucleófilos à íons oxônios cíclicos na ausência de solvente. A 5-monobromocavernicolina, i

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14

Khadraoui, Habib. "Contribution à l'étude de dérivés dihydroxy-tétraphosphoniques : structure cristalline de l'acide dihydroxy -1,6 hexylidène tétraphosphonique - 1,1',6,6' et de ses sels de potassium, sodium et cuivre." Châtenay-Malabry, Ecole centrale de Paris, 1993. http://www.theses.fr/1993ECAP0304.

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Notre travail a porté sur la synthèse et l'étude structurale par diffraction des rayons X de l'acide dihydroxy-1,6 hexylidène tétraphosphonique-1,1,6,6 (DHHTP: C6 H18 O14 P4. 4,5H2O) et de ses trois sels, sodium, potassium et cuivre. L'étude diffractométrique a établi la stoechiométrie de ses composés. Nous avons montré l'isomorphisme entre le sel de potassium et l'acide libre qui est en fait un sel d'oxonium; ce cation occupe les sites cristallographiques du cation potassium. La coordination est octaédrique pour Cu2+ et Na+, la coordinence de K+ et 8. Pour Na+ et K+, deux polyèdres de coordin

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15

Douguet, Nicolas. "Symmetry in the dissociative recombination of polyatomic ions and in ultra-cold few body collisions." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4654.

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We discuss the role of symmetries in the dissociative recombinations (DR) of three polyatomic ions, namely the linear HCO+ (formyl) ion and the two highly symmetric H+3 and H3O+ (hydronium) molecular ions. Regarding the HCO+ ion, we apply a quantum mechanical treatment using the Multi-channel Quantum Defect Theory (MQDT) formalism to describe the ion-electron scattering process. Our study takes into account the Renner-Teller effect in order to model the non Born-Oppenheimer vibronic coupling in linear polyatomic ions. The coupling has shown to represent the main mechanism responsible for elect

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16

Kopp, Clemens Reiner. "Die "Fallaciae ad modum Oxoniae" : ein Fehlschlusstraktat aus dem 13. Jahrhundert /." Köln : [Universität zu Köln], 1985. http://catalogue.bnf.fr/ark:/12148/cb400268654.

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17

Gonçalves, Ana Isabel Dias. "Caracterização de biofilmes de estirpes persistentes de Listeria monocytogenes." Master's thesis, ISA/UL, 2017. http://hdl.handle.net/10400.5/13853.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia - UL<br>Algumas estirpes de L. monocytogenes têm a capacidade de formar biofilmes e persistir em ambientes industriais, por longos períodos de tempo, mesmo após os processos de higienização. O principal objectivo deste trabalho foi caracterizar estirpes persistentes, em indústrias de carne de suíno e de aves, relativamente à sua capacidade de formação de biofilme e à susceptibilidade a um desinfectante comercial (P3 OXONIA) baseado em peróxido de hidrogénio, ácido acético e ácido peracético. A capacidade de formação de biofilm

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18

Lemaire, Gaétan. "Approches synthétiques de la Dasyscyphine D et du Laingolide A." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066501/document.

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Ce manuscrit présente une approche synthétique de deux produits naturels, la Dasyscyphine D et le Laingolide A. En ce qui concerne la Dasysyphine D, nous avons étudié une étape-clé de cycloaddition de Diels-Alder entre un diène et un diénophile, préparés par des réactions de couplage pallado-catalysées et/ou de métathèse cyclisante. Pour le Laingolide A, plusieurs isomères ont été synthétisés dans le but de déterminer la configuration relative des trois centres stéréogènes. Cette synthèse fait intervenir une réaction tandem dimérisation croisée/oxonia-Cope et une macrocyclisation finale forman

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19

Stewart, Craig. "Oxonium Ylide Rearrangements: A Novel Approach Towards the Synthesis of the Phorbol Skeleton." Phd thesis, 2010. http://hdl.handle.net/10048/961.

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Thesis (Ph. D.)--University of Alberta, 2010.<br>Title from pdf file main screen (viewed on June 22, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Chemistry, University of Alberta. Includes bibliographical references.

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20

Barroso, Inês Lírio. "Listeria monocytogenes biofilms produced under nutrient scarcity and cold stress: disinfectant susceptibility of persistent strains collected from the meat industry in Spain." Master's thesis, 2017. http://hdl.handle.net/10451/31052.

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Tese de mestrado em Microbiologia Aplicada, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2017<br>Listeria monocytogenes é uma bactéria gram-positiva que pertence ao reino Bacteria, filo Firmicutes, classe Bacilli, ordem Bacillales, família Listeriaceae e género Listeria. Caracteriza-se por ser anaeróbia facultativa e por possuir baixo conteúdo em G+C (38%) no seu genoma, sendo caracterizada por bastonetes curtos não esporulados com 0,4 μm de diâmetro e com comprimento entre 1 a 1,5 μm. Esta bactéria é capaz de crescer na presença de concentrações elevadas de sal (10%

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