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Dissertations / Theses on the topic 'Cyclopropane Ring'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Watson, Hayley. "Synthesis and reactivity of cyclopropanes and cyclopropenes." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9032.

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Activated cyclopropanes have been extensively used in synthetic chemistry as precursors for cycloaddition reactions. The rationale behind this is their ability to undergo ring-opening when activated by a Lewis acid, this can be enhanced further by the presence of a carbocation stabilising group like electron-rich aromatics. The stabilised dipole formed after ring opening can be trapped with suitable electrophiles such as imines and aldehydes via a [3+2] cycloaddition reaction. This results in the synthesis of pyrrolidines and tetrahydrofurans in excellent yields but moderate diastereoselectivi

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2

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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3

Willis, Terrance James 1959. "THERMAL RING OPENING OF CYCLOPROPANES AS INITIATORS FOR POLYMERIZATION." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276540.

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Donor-Acceptor tetramethylenes have been studied by polymerizations. 1,4-Zwitterionic intermediates are indicated when reactive tetramethylenes initiate homopolymerization. Alternately, 1,4-diradical intermediates initiate copolymerization. This basis for studying intermediates has led to an empirical table for predicting the zwitterionic and diradical nature of addition and polymerization reactions of tetramethylenes. Here we attempted to extend this work to trimethalylenes by studying the thermal ring opening of ethyl chrysanthemate, ethyl 1-cyano-2-(4-methoxyphenyl)-cyclopropane-corboxylate

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4

Gillman, Kevin W. "Hydroboration of strained cyclopropane ring systems promoted by Wilkinson's catalyst /." Online version of thesis, 1991. http://hdl.handle.net/1850/10947.

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5

Johnson, William T. G. "Synthesis of precursors of a highly pyramidalized alkene and ab initio calculations on methylenecyclopropane, cyclopropene, and 1,3-diradicals /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/11586.

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6

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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7

Cavitt, Marchello Alfonzo. "Stress relief: Exercising Lewis acid catalysis for donor-acceptor cyclopropane ring-opening annulations, a basis for new reaction methodologies." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54448.

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Nature’s biodiversity is complex and filled with beauty and wonder which are all observable on the macroscopic scale. This exquisiteness of nature’s intricacies are mirrored on the molecular level such that substances, large or small, are assembled to serve as signaling molecules, protective agents, and fundamental composites of higher-order frameworks for the operation and survival of life. Over the years, chemists have isolated and synthesized these molecules, known as natural products, to understand and evaluate their functions in biology and potential for medicinal applications. Although

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8

Grimm, Michelle L. "Development of New N-Cyclopropyl Based Electron Transfer Probes for Cytochrome P-450 and Monoamine Oxidase Catalyzed Reactions." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37919.

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The recent upsurge of degenerative diseases believed to be the result of oxidative stress has sparked an increased interest in utilizing the fundamental principles of physical organic chemistry to understand biological problems. Enzyme pathways can pose several experimental complications due to their complexity, therefore the small molecule probe approach can be utilized in an attempt understand the more complex enzyme mechanisms. The work described in this dissertation focuses on the use of N-cyclopropyl amines that have been used as probes to study the mechanism of monoamine oxidase (MAO) a

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9

Illy, Nicolas. "Activation non-métallique de la polymérisation anionique par ouverture de cycle des cyclopropane-1,1-dicarboxylates : application à la synthèse de transporteurs transmembranaires." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00481301.

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La base phosphazène ButP4 associée au thiophénol ou au bis (2-mercaptoéthyl) éther a été utilisée avec succès pour amorcer quantitativement la polymérisation anionique par ouverture de cycle des monomères cyclopropane-1,1-dicarboxylates de dialkyle. Pour des températures comprises entre 30 et 60°C dans le THF ou entre 30 et 100°C dans le toluène, le mécanisme observé est celui d'une polymérisation anionique vivante qui conduit à des polymères présentant des indices de polymolécularité faibles et dont les Mn expérimentaux (mesurés par SEC et RMN 1H) sont en accord avec les valeurs théoriques. D

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10

Aponte-Guzman, Joel. "Ring-Opening Benzannulations of Cyclopropenes, Alkylidene Cyclopropanes, and 2,3-Dihydrofuran Acetals: A complementary Approach to Benzo-fused (Hetero)aromatics." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54916.

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Over the past decades, functional group manipulation of aromatic precursors has been a common strategy to access new aromatic compounds. However, these classical methods, such as Friedel-Crafts alkylations and electrophilic/nucleophilic aromatic substitutions, have shown lack of regioselectivity besides the use of activators in excess amounts. To this end, numerous benzannulations to form benzo-fused substrates via Diels-Alder (DA), ring-closing metathesis (RCM), cycloaddition, and transition-metal-promoted processes have been reported. Appending a benzene ring directly onto a pre-existing rin

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11

Pale, Patrick. "Synthese et reactivite d'epoxyalcools acetyleniques chiraux : application a la synthese de cyclopropanes et d'heterocycles fonctionnalises." Reims, 1988. http://www.theses.fr/1988REIMS012.

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12

Jacoby, Denis. "Synthese et reactivite des cyclopropanes actives." Paris 6, 1987. http://www.theses.fr/1987PA066439.

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Ce travail decrit des mises au point originales de preparations de pyrrolines et de dihydrofurannes a partir de cyclopropylcetoesters. Ces derniers sont prepares a partir de sels de triphenylphosphonium, precurseurs de derives cyclopropaniques. La reactivite de ces composes cyclopropaniques vis a vis de nucleophiles varies est etudiee. L'action des amines primaires permet d'obtenir des pyrrolines. Une etude biologique montre l'activite biocide des composes prepares

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13

Flatt, Brenton T. Grubbs Robert H. "Transition metal alkylidene complexes via the ring-opening of cyclopropenes /." Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-10262007-082758.

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14

Lund, Elizabeth Anne. "Studies of samarium(II) iodide-induced ring openings and donor-acceptor cyclopropanes." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6817.

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Studies based on radical-induced ring openings of halolactones, spirocyclobutanones, and Rh$\sb2$(OAc)$\sb4$-catalyzed reactions of $\alpha$-diazoketones are described. Novel ring openings and subsequent decarboxylations of iodolactone 66 and bromolactone 67 to give diene 78 were found to proceed under SmI$\sb2$/THF/HMPA (4 equiv) conditions. Upon treatment of iodothialactone 63, iodolactone 66 or bromolactone 67 with SmI$\sb2$/THF/HMPA with "reverse addition" it was found that the ring-opened unsaturated acid 79 was obtained in good yield in each case. The unprecedented ring opening reactions

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15

Dousset, Maxime. "Réaction d'expansion de cycle : études dirigées vers l'accès aux cycles de taille moyenne via des espèces polarisées." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0577.

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Pour la recherche de candidats d’intérêt thérapeutique, l’accès à des systèmes carbonés toujours plus complexes peut se heurter à divers problèmes synthétiques. Afin d’enrichir la diversité structurales, il est nécessaire de pallier aux difficultés synthétiques par le développement de nouveaux outils de synthèse. Dans ce contexte, ce travail s’est principalement orienté sur l’accès de cycles carbonés par des réactions d’expansion de cycle via l’utilisation de composés polarisés. Une première partie est réalisée avec l’utilisation de l’α-chlorodiazoacétate d’éthyle dans la réaction d’expansion

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16

Volpicelli, Raffaella. "Iron(III) and manganese(III) mediated ring-opening reactions of cyclopropanol derivatives." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404925.

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17

Wang, Yi. "Stereoselective synthesis of multisubstituted alkenes via ring opening reactions of cyclopropenes : enantioselective copper catalysed asymmetric reduction of alkenylheteroarenes." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4607.

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A catalytic organometallic addition-ring opening sequence of cyclopropenes that enables the efficient and highly stereoselective synthesis of multisubstituted alkenes has been developed. A possible mechanism of organoaluminium reaction is proposed. The metalloenolate resulting from ring opening can be trapped with various electrophiles, enabling a rapid increase in molecular complexity in a one-pot operation. Also, in the presence of stoichiometric magnesium halides, a range of bis-activated cyclopropenes undergo highly stereoselective ring-opening reactions to produce multisubstituted alkenyl

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18

Dousset, Maxime. "Réaction d'expansion de cycle : études dirigées vers l'accès aux cycles de taille moyenne via des espèces polarisées." Electronic Thesis or Diss., Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0577.

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Pour la recherche de candidats d’intérêt thérapeutique, l’accès à des systèmes carbonés toujours plus complexes peut se heurter à divers problèmes synthétiques. Afin d’enrichir la diversité structurales, il est nécessaire de pallier aux difficultés synthétiques par le développement de nouveaux outils de synthèse. Dans ce contexte, ce travail s’est principalement orienté sur l’accès de cycles carbonés par des réactions d’expansion de cycle via l’utilisation de composés polarisés. Une première partie est réalisée avec l’utilisation de l’α-chlorodiazoacétate d’éthyle dans la réaction d’expansion

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19

Hackett, Siobhán. "Exploring the reactions of small rings." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8965.

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Small rings are frequently found in natural products as well as incorporated into drugs and agrochemicals in which they impart valuable properties on the biological activity of these compounds. Cyclopropanes are also extremely useful as reagents in organic synthesis, in particular as “umpolung” reagents, allowing access to products which would otherwise be more difficult to synthesise. This thesis will describe forays into the synthesis and further substitution of small rings as well as the iminium-catalysed ring-opening of cyclopropanes. The introduction will outline the uses and properties o

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20

Denis, Alexis. "Fonctionnalisations selectives a l'aide des complexes du palladium : synthese de composes d'interet biologiques, cyclopropanes vinyliques, aryl-3 oxazolidinones-2 (inhibiteurs potentiels de la monoamine oxydase)." Paris 6, 1987. http://www.theses.fr/1987PA066335.

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Ce travail porte sur l'utilisation du palladium (o) pour la synthese de molecules d'interet biologique. En premier lieu, on decrit la synthese stereoselective de cyclopropanes vinyliques et de pyrethrinoides. Dans un second temps, on etudie l'echange acetate phenol et l'amination de derives allyliques fibonctionnels. Enfin, on presente la synthese d'aryl-3 dihydroxy-5,5 oxazolidones-2 erythro et threo et etudie leur utilisation en tant qu'inhibiteur d'enzyme monoamine oxidase

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21

Patil, Dadasaheb V. "Intramolecular cyclization strategies for synthesizing medium-ring polycycles and the total synthesis of natural products." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50118.

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Carbo- and heterocyclic compounds are of great interest to chemists. Intramolecular cyclization strategies of donor-acceptor (D-A) cyclopropanes and alkylidene malonate monoamides have excellent potential for synthesis as they offer easy access to structurally-diverse compounds. The work described in this thesis accesses the scope of the In(OTf)3-catalyzed cyclization reaction of cyclopropanes and alkylidene malonate monoamides. In(OTf)3-catalyzed reactions of alkenyl and heteroaryl cyclopropyl ketones were examined in the synthesis of functionalized cyclohexenone-based derivatives (Chapter 2)

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22

Masson, Kevin. "Synthèse thermique de composés carbocycliques à huit chaînons supportée par calculs DFT." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0461.

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Les cycles totalement carbonés à huit chaînons constituent, encore de nos jours, un motif complexe à synthétiser en raison de leur forte tension de cycle inhérente. En parallèle, les petits cycles carbonés à trois chaînons sont des molécules hautement valorisables car il s’agit d’éléments permettant d’atteindre une grande complexité moléculaire dans une démarche à économie d’atome et souvent par le biais de réactions originales. Cette réactivité, issue du relâchement de la tension de cycle, permet d’accéder à des synthèses de molécule-cibles de façon rapide, contrôlée et compatible avec une mo

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23

Jenkins, Natalie Faye. "Cobalt(II) Catalysts - Their Use in the Enantioselective Ring-opening of 1,2-Dioxines." 2003. http://hdl.handle.net/2440/37913.

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A series of new cobalt(II) beta-keto iminato complexes and cobalt(II) salens have been made and the effect of chirality in the northern, southern and peripheral quadrants of these catalysts, with respect to induced enantiomeric excess, during the ring-opening of 1,2-dioxines has been determined. Synthesis of a series of cobalt beta-keto iminato complexes was achieved after modification of literature procedures used for the synthesis of manganese beta-keto iminato complexes and this procedure was applied to generate ligands with ethyl, t-butyl, (-)-bornyl, (+)-menthyl and (-)-menthyl esters and

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24

Haveli, Shrutisagar D. "Studies Of NIS Mediated Cyclopropane Ring Opening Reactions In Carbohydrate Chemistry." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/931.

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The thesis entitled ‘Studies of NIS Mediated Cyclopropane Ring Opening Reactions in Carbohydrate Chemistry’ is divided into four chapters. Chapter 1: Section 1: Efficient Synthesis of Fused Perhydrofuro[2,3-b]pyrans (and furans) by Ring Opening of 1,2-Cyclopropanated Sugar Derivatives. In this section a general and efficient methodology for the synthesis of carbohydrate derived perhydrofuro[2,3-b]pyrans (and furans) from the corresponding 1,2-cyclopropane carboxylates has been discussed. A wide range of linear-fused perhydrofuro[2,3-b]pyran or furan ring systems are encountered in a n

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25

Haveli, Shrutisagar D. "Studies Of NIS Mediated Cyclopropane Ring Opening Reactions In Carbohydrate Chemistry." Thesis, 2009. http://hdl.handle.net/2005/931.

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The thesis entitled ‘Studies of NIS Mediated Cyclopropane Ring Opening Reactions in Carbohydrate Chemistry’ is divided into four chapters. Chapter 1: Section 1: Efficient Synthesis of Fused Perhydrofuro[2,3-b]pyrans (and furans) by Ring Opening of 1,2-Cyclopropanated Sugar Derivatives. In this section a general and efficient methodology for the synthesis of carbohydrate derived perhydrofuro[2,3-b]pyrans (and furans) from the corresponding 1,2-cyclopropane carboxylates has been discussed. A wide range of linear-fused perhydrofuro[2,3-b]pyran or furan ring systems are encountered in a num

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26

Korotkov, Vadim. "Catalytic Insertion Reactions into the Cyclopropane Ring Syntheses of Various Belactosin C Congeners and Analogues." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-ACB0-6.

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27

Lehmann, Anna Louise. "gem-Dihalocyclopropanes as precursors to alkaloidal ring systems." Phd thesis, 2010. http://hdl.handle.net/1885/150781.

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gem-Dihalocyclopropanes (1) are an important class of compound that play significant roles in contemporary organic synthesis. This is largely due to their ease of preparation, (which is normally accomplished via addition of the relevant dihalocarbene to an alkene), and the wide range of reactions they can undergo. These reactions can be divided into two broad subgroups, those that proceed with retention of the three membered ring, and those where one of the C-C bonds is broken, thus leading to ring cleavage. The vast majority of gem-dihalocyclopropanes described in the literature are the dibro

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28

Lifchits, Olga. "Nucleophilic ring-opening of Methyl 1- Nitrocyclopropanecarboxylates." Thèse, 2008. http://hdl.handle.net/1866/7809.

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29

Korotkov, Vadim [Verfasser]. "Catalytic insertion reactions into the cyclopropane ring syntheses of various belactosin C congeners and analogues / vorgelegt von Vadim Korotkov." 2008. http://d-nb.info/992277442/34.

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30

Sydnes, Magne Olav. "Applications of gem-Dihalocyclopropanes in synthesis." Phd thesis, 2004. http://hdl.handle.net/1885/150075.

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31

Taylor, Rebecca M. "Exploiting ring-fused gem-dibromocyclopropanes in novel C-C bond forming reactions : applications to the synthesis of natural product frameworks." Phd thesis, 2005. http://hdl.handle.net/1885/146671.

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32

Phillis, Andrew Toroa. "Applications of gem-dichlorocyclopropanes in chemical synthesis." Phd thesis, 2008. http://hdl.handle.net/1885/150970.

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33

Narayanaswamy, Vijaya Ganesh. "Synthesis Of Septanosides Through An Oxyglycal Route And Studies Of Their Conformational And Mesophase Behavior." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/1021.

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Cyclopropanes are strained molecules and undergo reactions, for example, through ring opening and rearrangements. Preparative methods and reactivities of cyclopropanes are known widely in organic synthesis. The high reactivities inherent in cyclopropanes allow them to be valuable building blocks in organic synthesis. The combination of cyclopropanes and carbohydrates has been explored in recent years. Carbohydrates, the naturally-occurring members of chiral pool, are attractive platforms for asymmetric synthesis. Cyclopropanation of, for example, unsaturated sugars affords [4.1.0] bicycli

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34

Narayanaswamy, Vijaya Ganesh. "Synthesis Of Septanosides Through An Oxyglycal Route And Studies Of Their Conformational And Mesophase Behavior." Thesis, 2009. http://hdl.handle.net/2005/1021.

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Cyclopropanes are strained molecules and undergo reactions, for example, through ring opening and rearrangements. Preparative methods and reactivities of cyclopropanes are known widely in organic synthesis. The high reactivities inherent in cyclopropanes allow them to be valuable building blocks in organic synthesis. The combination of cyclopropanes and carbohydrates has been explored in recent years. Carbohydrates, the naturally-occurring members of chiral pool, are attractive platforms for asymmetric synthesis. Cyclopropanation of, for example, unsaturated sugars affords [4.1.0] bicycli

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35

Flatt, Brenton T. "Transition metal alkylidene complexes via the ring-opening of cyclopropenes." Thesis, 1995. https://thesis.library.caltech.edu/4264/1/Flatt_bt_1995.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The first chapter details the preparation and structural characterization of a rhenium (VII) oxo-vinylalkylidene complex and discusses its activity in olefin metathesis reactions. A substitution reaction affords the rhenium (V) oxo-trisalkoxide precursor, a species that surprisingly adopts a facial arrangement of three very bulky alkoxide ligands in its crystal structure. This complex reacts with 3,3-diphenylcyclopropene in a non-coordinating solvent to yield a mixture of two rh

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36

Johnson, Lynda K. "Methods for the synthesis of tungsten alkylidenes : ring-opening of cyclopropenes and alkylidene transfer from phosphoranes." Thesis, 1992. https://thesis.library.caltech.edu/6666/1/Johnson_lk_1992.pdf.

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<p>In the research reported in this thesis, two methods for synthesizing alkylidene complexes were investigated: (1) ring-opening of cyclopropenes to give vinyl alkylidene complexes and (2) alkylidene transfer from phosphorus ylides to metal centers. Tungsten(IV) imido precursors of the form WX_2(NAr)L_n (X = Cl or OR; Ar = Ph, 2,6-C_6H_3-Me_2, 2,6-C_6H_3-(i-PR)_2, L_n = PR3, P(OR)_3 or ether donor ligands) were used throughout the investigation.</p> <p>A brief overview of the syntheses and uses of high-valent alkylidene complexes is given in Chapter 1. The reactions of WCl_2(NAr)(PX_3)_3 (

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37

Jenkins, Natalie Faye. "Cobalt(II) Catalysts - Their Use in the Enantioselective Ring-opening of 1,2-Dioxines." Thesis, 2003. http://hdl.handle.net/2440/37913.

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A series of new cobalt(II) beta-keto iminato complexes and cobalt(II) salens have been made and the effect of chirality in the northern, southern and peripheral quadrants of these catalysts, with respect to induced enantiomeric excess, during the ring-opening of 1,2-dioxines has been determined. Synthesis of a series of cobalt beta-keto iminato complexes was achieved after modification of literature procedures used for the synthesis of manganese beta-keto iminato complexes and this procedure was applied to generate ligands with ethyl, t-butyl, (-)-bornyl, (+)-menthyl and (-)-menthyl esters a

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38

Ladd, Carolyn L. "Palladium-Catalyzed intramolecular sp3 C–H functionalization : studies in cyclopropyl and heterocyclic motifs." Thèse, 2017. http://hdl.handle.net/1866/20442.

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