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Dissertations / Theses on the topic 'Cyclopropanol ring opening'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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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

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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11

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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12

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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13

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

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14

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.

Full text

Abstract:

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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15

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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16

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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17

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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18

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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