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Dissertations / Theses on the topic 'Ring formation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Olmsted, Susan C. "Star Formation in Ring Galaxies." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/honors/322.

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Ring galaxies are specific types of interacting galaxies in which a smaller galaxy has passed through the center of the disk of another larger galaxy. The intrusion of the smaller galaxy causes the structure of the larger galaxy to compress as the smaller galaxy falls through, and to recoil back after the smaller galaxy passes through, hence the ring-like shape. In our research, we studied the star-forming regions of a sample of ring galaxies and compared to those of other interacting galaxies and normal galaxies. Using UV, optical, and IR archived images in twelve wavelengths from three tele

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2

Sutton, Phil J. "Saturn's turbulent F ring." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18475.

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As our abilities to utilise high performance computing to theoretically probe many astrophysical systems increases, a genuine need to relate to real systems becomes ever more important. Here, Saturn s rings can be used as a nearby laboratory to investigate in real time many astrophysical processes. One such system is the narrow F ring and its interaction with its inner shepherd moon Prometheus. Through numerical modelling and direct observations of the in-situ spacecraft Cassini we find new and exciting dynamics. These might help explain some of the asymmetries witnessed in the distribution of

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3

Iodice, Enrichetta. "Formation Scenarios for Polar Ring Galaxies." Doctoral thesis, SISSA, 2001. http://hdl.handle.net/20.500.11767/4321.

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4

Hylands, Kevin Alexander. "Nitrate ester formation from small ring heterocycles." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337731.

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5

Harter, Braxton Nicholas. "Lagrangian Coherent Structures in Vortex Ring Formation." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565828293505214.

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6

Robertson, Jeremy. "Ring expansion reaction via homolytic pathways." Thesis, University of Oxford, 1990. http://ora.ox.ac.uk/objects/uuid:194ca194-4848-470b-a21f-c16869257b96.

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The preparation of carbocyclic medium rings by two electron processes is reviewed with particular reference to the synthesis of natural products. The formation of medium rings by oxidative and homolytic methods is also reviewed. The synthesis and behaviour of both cis- and tran- ring expansion precursors is described. The 1,4-addition of tributylstannyl lithium to a range of cyclic α,β-unsaturated ketones was performed and procedures found whereby the so-formed enolates could be alkylated with a variety of electrophiles. Using these procedures a range of trans- ring expansion precursors were o

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7

Tigges, Sophia E. "The relationship between Centaur activity and ring formation." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115778.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 22-25).<br>Introduction: Centaurs are small bodies whose orbits lie between those of Jupiter and Neptune (Gehrels, 1999). They are thought to be transition objects that originate in the Kuiper belt and occupy the cis-Neptunian region before potentially becoming Jupiter-family or other short-period comets (Dones, Levison, & Duncan, 1996). Their short dynamical lifetimes are on the order of 106

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8

Prasad, Chaturvedula V. "Annulation and cycloaromatization reactions of 3-aryl (alkyl) thio-1-trimethylsiloxy-1-methoxy-1,3-butadienes." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75442.

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The title compounds were synthesized from methyl 3-aryl(alkyl)thio crotonic acids by deprotonation followed by silylation. The reactions of dienes with a number of carbonyl electrophiles under Lewis-acid catalysed conditions were investigated. The dienes exclusively give $ gamma$-alkylated products. The thio substituent enhances the $ gamma$-selectivity.<br>The reactions of dienes with a number of 1,3-dicarbonyl equivalents have been studied and a cycloaromatization reaction has been developed for the regiocontrolled synthesis of aryl sulfides in a 3C + 3C combination. The role of dienes in Di

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9

Lam, Yan-yu Sarah, and 林恩如. "Studies and applications of intermolecular (4+3) cycloaddition reactions of epoxy and aziridinyl enolsilanes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/206359.

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10

Schaefer, Anthony G. "Part 1, stereoselection in (4+2) cycloadditions ; Part 2, synthesis of 14-epiupial /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487585645577956.

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11

Olcay, Ali Bahadir. "Measurement of ambient fluid entrainment and calculation of vortex ring impulse during vortex ring formation." Ann Arbor, Mich. : ProQuest, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3258314.

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Thesis (Ph.D. in Mechanical Engineering)--S.M.U., 2007.<br>Title from PDF title page (viewed Mar. 18, 2008). Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1890. Adviser: Paul Krueger. Includes bibliographical references.

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12

Pungente, Michael D. "Antibody-catalyzed formation of a 14-membered ring lactone." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25138.pdf.

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13

Giang, Yun-Seng F. (Yun-Seng Frank). "Intramolecular 2+2 Cycloadditions of Ketenes." Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc331159/.

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The objective of this study was to explore intramolecular ketene cycloadditions with the anticipated results of developing new synthetic methodology for the synthesis of polycyclic compounds difficult to obtain by other procedures. (o-Alkenylphenoxy)ketenes were initially selected for this study because these ketenes provided a favorable proximity for the intramolecular [2+2] cycloaddition reactions. The difunctional precursors, (o-alkenylphenoxy)- acetic acids, were readily prepared from o-alkenylphenols and ∝-halocarboxylic acids and were converted to the corresponding acid chlorides by reac

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14

Podder, Ranjan Kumar. "Formation and cleavage of cyclopropane ring systems and related studies." Thesis, University of North Bengal, 1986. http://hdl.handle.net/123456789/848.

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15

Leftwich, Timothy Ray. "Modification of silicon-based substrates with cyclocondensation and cycloaddition reactions." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 111 p, 2010. http://proquest.umi.com/pqdweb?did=1992491831&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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16

Sengpracha, Waya. "Synthesis of biologically active indole-fused heterocyclic derivatives." Department of Chemistry - Faculty of Science, 2005. http://ro.uow.edu.au/theses/279.

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New synthetic routes to 1,2- and 2,3-fused indoles with seven- or eight-membered rings have been developed in this project, with the longer term aim of assessing their biological activity. Approaches to such fused indole derivatives were accessed via free radical cyclisation from 1- or 2-substituted indole derivatives with haloacetamide precursors. Using 1-substituted indole derivatives with haloacetamide functionalites, free radical cyclisation reactions gave fair yields of the indole- and dihydroindole-fused eight membered ring derivatives. Using 2-substituted indole derivatives with haloace

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17

Barbieri-Arhancet, Graciela I. "New oxy-dihydrofuran annulation methodology." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-09162005-115038/.

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18

Trova, Michael Peter. "Bond shifting and ring inversion within 1,4- and 1,5-annulated cyclooctatetraenes /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487335992904171.

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19

Pulipaka, Aravinda B. "Intramolecular ring opening reactions of aziridines by [pi]-nucleophiles /." View abstract, 2008. 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:3306530.

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20

Moustras, Marios Zacharias. "Imine formation relating to cross-linking in cellular macromolecules." Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260620.

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21

Foster, P. A. "The computer simulation of the gas dynamics in ring galaxy formation." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375065.

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22

Azim, Amir Affan Abdul. "Growth ring formation of selected tropical rainforest trees in Peninsular Malaysia." Master's thesis, Kyoto University, 2014. http://hdl.handle.net/2433/188776.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第18338号<br>農博第2063号<br>新制||農||1023(附属図書館)<br>学位論文||H26||N4845(農学部図書室)<br>31196<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授大澤晃, 教授髙部圭司, 教授北山兼弘<br>学位規則第4条第1項該当

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23

Dad, Mohammad M. (Mohammad Mehdj). "Aminoketene. Cycloaddition of Ketenes and Imines to Yield β- or δ- Lactams". Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc332534/.

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The purpose of this investigation was to provide a systematic study of the cycloaddition pf (N-alkyl-N-phenylamino)- methoxy-and dichloroketenes to various imines and to investigate the stereochemistry of these cycloadditions.

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24

Katkova, Olga. "Photochemical isomerization and stereoselective thermal cycloaddition reactions of conjugated nitrones." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1123003688.

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25

Moss, Neil. "Divinylcyclopropane rearrangements : preparation of tricyclic ring systems and a formal total synthesis of (±)-quadrone." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25942.

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The first section of this thesis describes three model studies involving the synthesis of the divinylcyclopropanes (135), (136), and (137) and the subsequent thermal rearrangement of these compounds to provide the interesting tricyclic compounds (139), (140), and (141). [Formula Omitted] The second section of this thesis describes a formal total synthesis of the antitumor sesquiterpenoid (±)-quadrone (34). The synthesis is based on the chemistry developed in the model studies and involves the thermal rearrangement of the divinylcyclopropane (304) as the key step. The resulting product, compoun

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26

Rayanil, Kanok-on. "Studies of the chemistry of Tröger's base, cyclopentadienones, and 2,1-benzothiazines." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/5861.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed Aug. 10, 2007). Vita. Includes bibliographical references.

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27

姚大源 and Tai-yuen Yue. "Cycloaddition reactions of 2-vinylchromones." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31210661.

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28

老永康 and Wing-hong Lo. "Novel rearrangements of dioxodibenz[b,f]azocine." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B3121437X.

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29

Lo, Tsz-kiu Brian, and 盧子翹. "Intermolecular [4+3] cycloaddition reactions using epoxy enol silanes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45877749.

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30

Ross, Robert John. "Synthesis of an ingenane A/B-ring analogue : a model study for the total synthesis of ingenol /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487266362337137.

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31

Lo, Wing-hong. "Novel rearrangements of dioxodibenz[b, f]azocine /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18597671.

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32

Lang, William Jonathan. "Molecular clouds in the #lambda#-orionis ring : a new CO survey." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389119.

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33

Zahid, Abdul. "Nitrogen heterocycles by tandem cationic cyclisation-aziridinium ion formation-nucleophilic ring opening." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426848.

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34

Cheng, Johnathan Zandrew. "Nature's approach toward ring formation and structural diversity in ergot alkaloid biosynthesis." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65472.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2011.<br>Vita. Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Ergot alkaloids are fungal-derived secondary metabolites well known for a diverse array of pharmacological effects both beneficial and detrimental to human health. Historically, the ergot alkaloids have been known to cause ergotism in populations that consume grain contaminated by ergot alkaloid producing fungus. However, naturally isolated and semi-synthetic derivatives of certain ergot alkaloids have also been used to trea

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35

Crouch, Nicholas. "The mechanism of the enzymatic ring expansion of penicillin N to deacetoxycephalosporin C." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:de3e54eb-b4b5-4673-a863-3c094cc1456d.

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The order of events in the Deacetoxycephalosporin C/Deacetylcephalosporrn C Synthetase (DAOC/DAC Synthetase) catalysed ring expansion of penicillin N to deacetoxycephalosporin C has been investigated by the use of labelled/unlabelled penicillin N mixed competitive kinetic isotope effect experiments, in which the labelled penicillin N substrates were either labelled in the pro <strong>R</strong>- and pro <strong>S</strong>-methyl groups or at C-3. In addition, to assisting in the determination of the position of the first irreversible event in this reaction, deuteration at C-3 gave rise to a bi

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36

Cwynar, Valerie A. "Studies toward the synthesis of the C₁₉ quassinoid polyandrane." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1168377607.

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37

McCloskey, Candice Joy. "Model studies toward the total synthesis of jatrophatrione: formation of nine-membered rings via Indian derivatives." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/30670.

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38

Leung, Sze-kar, and 梁詩嘉. "Novel reactions of oxabicyclic compounds and reductive aldol cyclizations of activated alkynes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B44570156.

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39

Liu, Lok-lok, and 廖樂樂. "Studies toward the total synthesis of (+)-cortistatin J via an intramolecular (4+3) cycloaddition." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4659162X.

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40

Weddell, Derek Alexander. "Synthesis, structure determination and mechanism in thiophene derivatives." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343542.

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41

Rane, Digamber Sadanand. "Acyl Imidazole : A Promising Template for Asymmetric Lewis and Brønsted Acid Mediated 1,3-Dipolar Cycloadditions." Diss., North Dakota State University, 2011. https://hdl.handle.net/10365/29336.

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Construction of chiral complex molecules continues to be a challenge for organic chemists all over the world and to address this challenge numerous methodologies have been developed. 1,3-Dipolar cycloaddition reactions is one such simple and elegant method, which can be employed towards the construction of chiral heterocycles. The ability to construct multiple stereocenters in one operation is one of the salient features of dipolar cycloaddition reaction. Asymmetric dipolar cycloaddition via chiral Lewis or Bronsted acid catalyzed processes is aided by the development of various templates, whi

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42

Rane, Digamber Sadanand. "Acyl Imidazole : A Promising Template for Asymmetric Lewis and Br?nsted Acid Mediated 1,3-Dipolar Cycloadditions." Diss., North Dakota State University, 2011. https://hdl.handle.net/10365/29336.

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Construction of chiral complex molecules continues to be a challenge for organic chemists all over the world and to address this challenge numerous methodologies have been developed. 1,3-Dipolar cycloaddition reactions is one such simple and elegant method, which can be employed towards the construction of chiral heterocycles. The ability to construct multiple stereocenters in one operation is one of the salient features of dipolar cycloaddition reaction. Asymmetric dipolar cycloaddition via chiral Lewis or Bronsted acid catalyzed processes is aided by the development of various templates, whi

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43

Zhang, Hongkui. "1,3-dipolar cycloadditions of α, β-unsaturated sultone and sultams". HKBU Institutional Repository, 2004. https://repository.hkbu.edu.hk/etd_ra/532.

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44

Wan, Honghe. "Allenes and (2+2+1) cycloaddition reactions." Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=195.

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Thesis (M.S.)--West Virginia University, 1998.<br>Title from document title page. Document formatted into pages; contains xii, 99 p. : ill. Includes abstract. Includes bibliographical references (p. 93-99).

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45

Kahraman, Mehmet. "Studies of intramolecular [4+3]-cycloadditions and chiral molecular clefts /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9904851.

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46

Diamond, Brian J. "Temperature and PH dependence of the cyclization of creatine." Huntington, WV : [Marshall University Libraries], 2005. http://www.marshall.edu/etd/descript.asp?ref=550.

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47

Sautermeister, Falko Alexander. "Piston ring lubrication-influence of sulphuric acid formation from high sulphur content fuel." Thesis, University of Leeds, 2012. http://etheses.whiterose.ac.uk/3132/.

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Large 2-stroke marine diesel engines burn high sulphur content residual fuel. The sulphur converts to aqueous sulphuric acid, H2SO4, and condenses on the cylinder liner surface, where it causes corrosive attack when not neutralised by the high alkaline reserve in the lubricant. Cylinder liner wear and deposit formation are observed to reflect poor lubricant distribution, surface temperature and sulphur fuel content, which all influence acid concentration. Currently neglected by the industry, is the catalysing action of H2SO4 on lubricant degradation and the rheology of entrained droplets in th

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48

McKibben, Bryan P. "Reactivity studies of arene-cis-diols in cycloadditions and potassium permanganate oxidations : synthesis of the corresponding arene-trans-diols and an approach to the synthesis of (+)-pancratistatin /." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164317/.

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49

Jones, Alan Morenc. "The synthesis of medium-sized ring containing libraries using oxidative fragmentation and rearrangement strategies /." St Andrews, 2009. http://hdl.handle.net/10023/663.

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50

Hewitt, Russell James. "Investigations of ring-opening reactions of cyclopropanated carbohydrates : towards the synthesis of the natural product (--)-TAN-2483B : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Doctor of Philosophy in Chemistry /." ResearchArchive@Victoria e-Thesis, 2010. http://hdl.handle.net/10063/1249.

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