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Dissertations / Theses on the topic 'Ethers'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Huang, Zilin. "Synthesis and Complexation Studies of Novel Functionalized Crown Ethers and Azacrown Ethers." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5593/.

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Novel cage-functionalized azacrown ethers, i.e. 51, 52, 53, 55, 57, 61 and 62, which have various crown cavity and different number of nitrogen atoms incorporated, have been prepared. X-ray structures of 53, 55 and 57 have been obtained for the study of the crown topological structure. The complexation properties of crown 51, 52, 57, 61 and 62 have been evaluated via alkali metal picrate extraction, silver picrate extraction and ESI-MS study. The novel cage-fuctionalized azacrown ethers generally exhibit high avidity and selectivity towards Ag+ versus alkali metal ions and some transition meta
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2

Welsh, Gwendolyn L. "Polybrominated diphenyl ethers." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1216928488.

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Thesis (M.S.)--University of Cincinnati, 2008.<br>Advisors: Jodi Shann PhD (Committee Chair), Brian Kinkle PhD (Committee Member), Anne Vonderheide PhD (Committee Member), Stacy Pfaller PhD (Committee Member) Title from electronic thesis title page (viewed Oct. 5, 2008). Includes abstract. Keywords: Brominated Flame Retardants; PBDE; GC-MS; Soil Sorption; Bioavailability; GC-ECD; Microbial Degradation Includes bibliographical references.
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3

Lousenberg, Robert Daniel. "Synthesis of trifluorovinyl ethers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29227.pdf.

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4

Rico, Joseph G. "Directed lithiations of enol ethers : stereoselective synthesis and reactions of substituted enol ethers." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/27166.

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5

Yassin-Hussan, Saad. "Photolyse des ethers aromatiques halogenes : bromo phenetole, paradibromo phenetole, parabromo phenetole, parabromodiphenyl ether." Toulon, 1990. http://www.theses.fr/1990TOUL0004.

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Nous avons etudie la photolyse, par rayonnement ultra-violet, de quatre ethers halogenes aromatiques (bromophenetole, parabromophenetole et parabromobiphenylether) dans l'acenotrile, l'eau et dans les melanges eau-acetonitrile, eau-methanol, en presence ou en absence de peroxyde d'hydrogene, compose jouant le role de photooxydant. L'irradiation ultra-violette de ces composes genere de nombreux photoproduits qui ont ete identifies, apres extraction liquide-liquide, par analyse en chromatographie liquide et gazeuse et c. P. V. Couplee a la spectrometrie de masse. Les cinetiques de photodecomposi
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6

Starkey, Darren Paul. "The tropospheric oxidation of ethers." Thesis, University of Hull, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322331.

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7

Jones, D. "The synthesis of aryl ethers." Thesis, Swansea University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637726.

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The synthesis of biaryl ethers is a process of importance in many fields within the chemical industry. Generally, the Ullmann ether synthesis is employed, though improvements in the general method have not been commonplace since the inception of the process at the turn of the century. By reinvestigating the parameters present, it was found that the use of cuprous iodide in a solventless reaction led to high yields of diaryl ethers. Further improvements were developed by the implementation of ultrasound in conjunction with lower reaction temperatures, with similarly high yields being afforded.
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8

Vile, Sadie. "Alpha-sulphonyl ethers in synthesis." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46595.

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9

Wild, Carl. "Trifluoroethyl enol ethers, dienol ethers, and acetals: an investigation of their preparations, reactivities, and synthetic applications." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54459.

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The major portion of this work details our investigation of trifluoroethoxy (TFE) substituted compounds with particular emphasis given to their preparation and possible applications. The three types of compounds studied were trifluoroethoxy substituted ketals, enol ethers, and dienol ethers. The ketal and enol ether work involved developing methodology for the large scale preparation of these structures as well as studies detailing their behavior. For the TFE ketals, preparation involved an acid-catalyzed alcohol exchange reaction. Applications included their use as non-complexing/acid-stable
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10

Landry, Denis Joseph Carleton University Dissertation Chemistry. "Approaches to the synthesis and sterochemical analysis of aza crown ethers." Ottawa, 1989.

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11

Huang, Zilin. "Synthesis and Properties of Novel Cage-Annulated Crown Ethers." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc5523/.

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Three cage-functionalized polyoxacrown ethers (9, 10 and 12) and four novel cage-functionalized polyoxamonoazacrown ethers (18, 20, 25 and 29) that contain 3,5-disubstituted-4-oxahexacyclo[5.4.0.02,6.03,10.05,9.08,11]dodecane ("oxahexacyclic") moiety have been synthesized and their respective alkali metal picrate extraction profiles along with that of three analogues 13, 14 and 21 have been obtained. The observed avidities and selectivities of the host molecules toward complexation and transport of alkali metal picrates can be related to the size and shape of their respective macrocyclic
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12

Kleissler, Charles Richard. "Comparison of poly(vinyl alcohol) backbone-grafted ethers and chain-growth crown ether polymers in selective cation adsorption." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/10115.

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13

Lightfoot, Andrew Philip. "Chiral oxime ethers : applications in synthesis." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/28182.

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Chapter One reviews the literature, discussing the role of nucleophilic additions to oximes and their derivatives. This introduction is primarily concerned with the formation of new carbon–carbon bonds, this is achieved by the addition of organometallic reagents to the carbon–nitrogen double bond functionality of oximes and their derivatives.
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14

Fowler, Tom. "Claisen rearrangments of bicyclic enol ethers." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414088.

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15

Telford, Peter T. "New routes to highly fluorinated ethers." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6835/.

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The aim of this research project was to devise a viable synthetic route to perfluoropolyethers. Current commercial processes are elaborate but inefficient and hence are limited in application by cost. The approach undertaken in this project consisted of essentially two steps; (1) the free radical addition of a polyether to a fluorinated olefin and (2) the direct fluorination of the polyadducts derived from the addition process (scheme i) (Rf = polyfluoroalkyl, Rf(^1) = perfluoroalkyl) The research work was carried out in two phases. The initial investigation examined the free radical addition
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16

Owens, K. A. "Polycyclic crown ethers incorporating cyclophane units." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370864.

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17

Laurent, Pierre. "Asymmetric synthesis using chiral oxime ethers." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248161.

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18

Hunt, James Charles Atlee. "Chiral oxime ethers in asymmetric synthesis." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302639.

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19

Wilson, Mark James. "Activity relationships for aromatic crown ethers." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249872.

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20

Dawkins, David Anthony. "Asymmetric synthesis using chiral vinyl ethers." Thesis, University of Leicester, 1992. http://hdl.handle.net/2381/33644.

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Using chiral alcohol precursors, a number of chiral vinyl ethers were prepared by mercuric acetate-catalysed transetherification with butyl vinyl ether. a-Lithiation of (1R)-menthyl vinyl ether was unsuccessful under a variety of conditions. (1S)-(Menthylthio)ethene was prepared from (1S)-menthanethiol but deprotonation was not possible as the thioether was found to decompose rapidly at room temperature. The deprotonation of (R)-phenethyl vinyl ether, (S)-l-(2-naphthyl)-l-ethyl vinyl ether and (S)-l-phenyl-1-butyl vinyl ether and attempted reaction with benzaldehyde yielded none of the a-alkyl
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21

Awad, Amneh. "Palladium Catalyzed Reactions of Enol Ethers." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398070523.

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22

Snelling, Jeff Barnett Mark O. "Higher ethers as replacement oxygenates for methyl tertiary butyl ether in gasoline synthetic and environmental aspects /." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2006%20Fall/Dissertations/SNELLING_JEFF_42.pdf.

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23

Bodvik, Rasmus. "Bulk and interfacial properties of cellulose ethers." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95379.

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This work summarizes several studies that all concern cellulose ethers of the types methylcellulose (MC) hydroxypropylmethylcellulose (HPMC) and ethyl(hydroxyethyl)cellulose (EHEC). They share the feature of negative temperature response, as they are soluble in water at room temperature but phase separate and sometimes form gels at high temperatures. The different types of viscosity transitions occurring in these three cellulose ethers are well-known. However, earlier studies have not solved the problem of why both HPMC and EHEC, as the temperature increases, exhibit a viscosity decrease just
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24

Gorgy, Tamer George Alexan. "Polybrominated diphenyl ethers in biosolids-amended soils." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/35020.

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Polybrominated diphenyl ethers (PBDEs) are added to many consumer products as flame retardants. Their hydrophobic characteristics and high n-octanol-water coefficients make them partition in organic media such us sludge and biosolids, by-products of wastewater treatment which are commonly applied to agricultural soils to promote crop growth or discarded in landfills. Biosolids-amended soils have been found to contain up to 7x10⁶ pg PBDEs/g dry weight, whereas leachates from biosolids and flame-retarded products in landfills, contained up to 4,000 pg PBDEs/litre. PBDEs in the environment could
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25

Fruteau, de Laclos Anne-Marie F. (Anne-Marie François). "Cleavage of benzyl aryl ethers by chlorine." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70291.

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In order to extend application of the gel-degradation mechanism of delignification, model compounds of the general structure (3,4-dimethoxyphenyl)-CH(OR)R$ sp prime$ were treated at room temperature with increasing charges of molecular Cl$ sb2$ in glacial HOAc.<br>Catalytic amounts of Cl$ sb2$ cleaved benzyl aryl ether bonds (OR=2-methoxy-4-methylphenoxy) before any ring chlorination occurred. Yields of cleavage decreased in the order: R$ sp prime$=H; R$ sp prime$=$-$CH$ sb2$-2-methoxyphenoxy; R$ sp prime$=$-$CH(CH$ sb2$OH)-2-methoxyphenoxy. These results support the concept that the delignifi
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26

Scullion, Lisa. "Single molecular conductance of ethers and peptides." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539474.

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27

Wadman, S. N. "Stereoselective alkene syntheses from cyclic enol ethers." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233924.

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28

Engel, García Paloma. "Novel coupling reactions for complex polycyclic ethers." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4339/.

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Development of cascade RCM reactions, where two different approaches are proposed. The first route involves a ruthenium-catalysed enyne RCM reaction, followed by a metallotropic [1,3]-shift and a final alkene RCM. The second route incorporates an enyne RCM reaction followed by direct alkene metathesis. These methodologies provide access to common bicyclic and tricyclic polyether skeletons such as those present in tamulamide, prymnesin, gambierol and maitotoxin, respectively. The second project is concerned with the synthesis of the C-G ring fragment of gambieric acid and the development of nov
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29

Taylor, Piers. "Aza-enolate alkylation reactions of lactim ethers." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425801.

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30

Denike, John Kane Carleton University Dissertation Chemistry. "The synthesis and complexation of bis-crown ethers and polymers bearing pendant crown ethers and the study of molecular motion of crown ethers in solids using solid state 2H NMR." Ottawa, 1992.

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31

Höglund, Anders. "Controllable degradation product migration from biomedical polyester-ethers." Licentiate thesis, KTH, Fibre and Polymer Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4366.

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<p>The use of degradable biomedical materials has during the past decades indeed modernized medical science, finding applications in e.g. tissue engineering and drug delivery. The key question is to adapt the material with respect to mechanical properties, surface characteristics and degradation profile to suit the specific application. Degradation products are generally considered non-toxic and they are excreted from the human body. However, large amounts of hydroxy acids may induce a pH decrease and a subsequent inflammatory response at the implantation site.</p><p>In this study, macromolecu
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32

Merilis, Giorvanni. "Distribution of Polybrominated Diphenyl Ethers Among Demographic Categories." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6903.

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Polybrominated Diphenyl Ethers (PBDEs) are flame retardants widely used within the United States in various products such as plastics, electronics, textiles and furniture. With an increase in production and usage, PBDEs have recently emerged as a contaminant of concern. Due to their chemical structure, PBDEs have the propensity to bioaccumulate in mammals. In fact, elevated PBDE concentrations have been recorded in human breast milk. Due to the potential widespread exposure to PBDEs, this study investigates human blood concentrations of PBDEs generated through the 2003-2004 National Health and
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33

Rolland, de Denus Christine Marie. "Controlled molecular design and polymerization of polyaromatic ethers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23656.pdf.

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34

Teclechiel, Daniel. "Synthesis and characterization of highly polybrominated diphenyl ethers." Doctoral thesis, Stockholm : Department of Environmental Chemistry, Stockholm university, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7410.

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35

Danon-Schaffer, Monica N. "Polybrominated diphenyl ethers in landfills from electronic waste." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/20740.

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Previous research on Brominated Flame Retardants (BFRs), including Polybrominated Diphenyl Ethers (PBDEs), has largely focused on their concentrations in the environment and their adverse effects on human health. This thesis explores how these compounds reach the environment, how they are transferred from waste streams to water and soil, and how they are transported to distant locations like Northern Canada. Landfills, which receive a large proportion of society’s discarded consumer waste products, including electronic wastes (e-waste), are the major focus of attention. Leachate was collecte
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36

Gallimore, A. R. "The biogenesis of terrestrial and marine polycyclic ethers." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599282.

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The widely accepted hypothetical model for polyether biosynthesis involves a polyene intermediate that undergoes an oxidative cyclisation via the corresponding polyepoxide. Recently, a triene shunt metabolite from monensin-producing <i>Streptomyces cinnamonensis</i> lent great support to this model. Sequencing of the gene cluster also supported this model. However, the role of two novel genes, <i>monBI and monBII, </i>was unclear. Deletion of these genes resulted in the production of a number of apparent monensin analogues, whilst abolishing monensin production itself. By isolating and charact
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37

Bird, P. M. "Stereocontrol in the synthesis of substituted spirocyclic ethers." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596658.

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This thesis describes the synthesis of spirocyclic ethers with substituents in both rings. The strategy employed is considered in stepwise manner starting with the two-step synthesis of the substituted cyclic α-phenylsulfanylcarbaldehydes A and B from the corresponding cyclic ketones, paying particular attention to the stereoselectivity in the first step and the stereospecificity of the second. Simple aldol reactions of these aldehydes with ester and ketone enolates are reported, along with the conversion of the aldol products C to (1,3)-diols D by reduction (including the[1,3]-stereoselective
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38

Trmcic, Jelena. "Electrophilic fluorination of ethers and deactivated benzene derivatives." Thesis, Durham University, 2005. http://etheses.dur.ac.uk/2769/.

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Chapter 1 - Chapter 1 provides a literature review of the relevant topics for this thesis in organofluorine chemistry: effect of fluorine as a substituent on the molecule, synthesis of C-F bond from C-H bond using electrophilic reagents with discussions of mechanisms. Chapter 2 ― Direct fluorination of electron-rich systems such as alkyl and cyclic saturated ethers using elemental fluorine results in the formation of unexpected products: fluorinated aldal acetáis. Selectfluor™ was also used to prepare these products in good yield, but also to gain information about mechanism. Chapter 3 - Same
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39

Merithew, Andrew William. "Differential Self-Assembly of Novel Redox Crown Ethers." Thesis, University of California, Santa Barbara, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3645672.

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<p> Retinal prosthesis relies on the stimulation of living nerve tissue behind the rods and cones of the eye. The current state of the art relies on electrodes controlled by cameras which directly stimulate the nerve tissue to elicit a response to an image. These types of retinal implants have allowed for short-term crude vision in patients but have had limited long term success due to external battery packs and electroplating of the implanted electrodes.</p><p> Ionic stimulation is one of the principle mechanisms that sensory neurons utilize in the generation of an action potential. In a co
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40

Fregapane, Giuseppe. "Chemo-enzymatic synthesis of sugar fatty acid ethers." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357150.

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41

Cooper, Tracey Sara. "Synthesis of amino acids from chiral oxime ethers." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432786.

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42

Heslin, J. C. "Synthesis of cyclic ethers and approaches to zoapatanol." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47108.

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43

Wikström, Linus. "Surface treatment of cellulose ethers Ytmodifiering av cellulosaetrar." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17977.

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The aim of this diploma work was to execute surface treatment of non-ionic cellulose ethers EHEC that AkzoNobel provides under the tradename Bermocoll®. In order for the cellulose ether to dissolve without forming lumps, some surface treatment is commonly required. In this work glyoxal has been used for this surface modification using two different lab-scale methods that in different ways mimic the full scale production. It is an everlasting challenge for the chemical industry to reduce the consumption of chemicals and also reduce energy consumption in the production. Therefore one objective o
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44

WELSH, GWENDOLYN L. "Polybrominated Diphenyl Ethers: Soil Sorption and Microbial Degradation." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1216928488.

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45

Ji, Mingzhe. "Explorations with optically active, cage-annulated crown ethers." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4207/.

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A variety of optically active macrocyclic crown ethers that serve as "host" systems that are capable of differentiating between enantiomeric "guest" molecules during host-guest complexation have been prepared via incorporation of chiral elements into the crown ring skeleton. The ability of these crown ethers to recognize the enantiomers of guest salts, i.e., (+) a-methyl benzylamine and to transport them enantioselectively in W-tube transport experiments were studied. The ability of these crown ethers to perform as chiral catalysts in an enantioselective Michael addition was studied. The exten
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46

Gouardères, Frédéric P. "The cationic ring-opening polymerization of cyclic ethers." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9681/.

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The kinetics and mechanisms of ring opening polymerization and copolymerizntion of different cyclic ethers were studied using mainly a cationic system of iinitiation. BF30Et2/ethanediol. The cyclic ethers reacted differently showing that ring strain and basicity are the main driving forces in cationic ring opening polymerizaion. In most cases it was found that the degree of polymerization is controlled kinetically via terminations with the counterion and the monomers, and that the contribution of each type of reaction to the overall termination differs markedly. The Gel permeation chromatograp
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47

Page, Abigail. "Atropisomeric diaryl ethers and other non-biaryl atropisomers." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/atropisomeric-diaryl-ethers-and-other-nonbiaryl-atropisomers(84281e1e-416b-4d2e-834b-1d215d6767cf).html.

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Atropisomerism is a property exhibited by molecules where rotation about one or more bonds is restricted. Along with biaryls, which are widely utilised in asymmetric catalysis, several other classes of compounds display atropisomerism. These molecules have applications in enantioselective synthesis, asymmetric catalysis and have been used to relay stereochemical information. There are, however, a number of challenges associated with their asymmetric synthesis (Chapter 1). This thesis describes research carried out on the synthesis and asymmetric synthesis of atropisomeric diaryl ethers. Chapte
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48

LLORENS, GILBERT. "Contribution a l'etude des ethers d'alcool gras polyoxyethylene." Strasbourg 1, 1993. http://www.theses.fr/1993STR15021.

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49

D'Souza, Lawrence Joseph. "Bile Acid Based Molecular Tweezers And Crown Ethers." Thesis, Indian Institute of Science, 1995. https://etd.iisc.ac.in/handle/2005/114.

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Chapter 1. Introduction to Molecular Tweezers Whitlock and Zimmerman developed a class of molecular hosts, popularly known as molecular tweezers, which sandwich aromatic guests by ii=ii interaction. Chapter 1 summarizes molecular tweezers of various kinds which have recently been synthesized. Chapter 2. Design and synthesis of "Bile Acid-Based Molecular Tweezers" Bile acids have a rigid backbone, and the array of hydroxyl groups separated by 5-7 A provides opportunities for the attachment of binding surfaces such as two extended chromophoric units.
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50

D'Souza, Lawrence Joseph. "Bile Acid Based Molecular Tweezers And Crown Ethers." Thesis, Indian Institute of Science, 1995. http://hdl.handle.net/2005/114.

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Chapter 1. Introduction to Molecular Tweezers Whitlock and Zimmerman developed a class of molecular hosts, popularly known as molecular tweezers, which sandwich aromatic guests by ii=ii interaction. Chapter 1 summarizes molecular tweezers of various kinds which have recently been synthesized. Chapter 2. Design and synthesis of "Bile Acid-Based Molecular Tweezers" Bile acids have a rigid backbone, and the array of hydroxyl groups separated by 5-7 A provides opportunities for the attachment of binding surfaces such as two extended chromophoric units.
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