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Dissertations / Theses on the topic 'Mechanism of Cyclization'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Huguet, i. Subiela Núria. "Exploring new gold-catalyzed cyclization reactions of 1,5-enynes and development of an intermolecular phenol synthesis." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/108959.

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Las sales de oro se han convertido en uno de los catalizadores por excelencia en una gran variedad de transformaciones orgánicas mediante la activación selectiva de alquinos, alenos y alquenos. Parte del trabajo de esta tesis doctoral se ha centrado en el estudio de la naturaleza carbénica o carbocatiónica de los intermedios de reacción presentes en las cicloisomerizaciones de 1,5-eninos catalizadas por complejos de oro. De esta forma se han desarrollado distintas metodologías de ciclación dando lugar a diferentes productos tricíclicos a partir de oxo-1,5-eninos o 1,5-bencileninos. Ademá

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2

Navale, G. R. "Improved production of epi-cedrol and santalene by fusion protein expression: Stability study and cyclization mechanism of epi-cedrol biosynthesis." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2021. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/5904.

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A wide range of secondary metabolites are produced by living organisms such as plants, bacteria and fungi as a part of their defense system against herbivores, pests and pathogens etc. Isoprenoids often called as terpenoids, are the most abundant and highly diverse family of natural organic compounds. In Plants, they plays a diverse part in photosynthetic pigments, hormones, electron carrier, structural components of membrane, as well as an important role in communication and defense. Many isoprenoids have useful applications in the pharmaceutical, nutraceutical, and chemical industries

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3

Warner, Benjamin Peter. "Mechanisms of metal-mediated cyclizations." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36008.

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4

Hancock, Amber N. "A Radical Approach to Syntheses and Mechanisms." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77139.

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The critically important nature of radical and radical ion mechanisms in biology and chemistry continues to be recognized as our understanding of these unique transient species grows. The work presented herein demonstrates the versatility of kinetic studies for understanding the elementary chemical reactions of radicals and radical ions. Chapter 2 discusses the use of direct ultrafast kinetics techniques for investigation of crucially important enzymatic systems; while Chapter 3 demonstrates the value of indirect competition kinetics techniques for development of synthetic methodologies for co

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5

Belotti, Damien. "Cyclisation photoreductrice de cetones insaturees, applications : syntheses totales de l'hirsutene et de l'actinidine." Reims, 1988. http://www.theses.fr/1988REIMS006.

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L'irradiation de cetones delta ,epsilon -insaturees en presence de donneurs d'electrons tels que l'hmpt et la triethylamine donne une cyclisation photoreductrice menant a des cyclopentanols. Generalisation de cette reaction a des cetoamides : obtention d'aza-3 bicyclo(4. 3. 0) nonanes

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6

Cadieu, Marie-Claude. "Reactions de contact des octanes sur des catalyseurs a base de platine et de palladium." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13023.

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Etude des differences de comportements catalytiques entre des catalyseurs supportes pt et pd a partir d'un nouveau type d'hydrocarbure test: les octanes. Mecanisme de cyclisation et d'isomerisation des aliphatiques et d'hydrogenolyse des cyclopentanes

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7

Béteille, Jean-Pierre. "Thermolyse eclair d'allyl-1 silacyclopentenes-3 : etude mecanistique et application a la synthese d'hydrogenosiloles et de leurs derives fonctionnels." Toulouse 3, 1988. http://www.theses.fr/1988TOU30156.

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La pyrolyse eclair d'allyl-1 silolenes-3 est effectuee. Elle permet d'obtenir des hydrogenosiloles ainsi que des siloles fonctionnels a liaison silicium-azote, -oxygene ou -fluor et des siloles a groupement aryle ou allyle lie au silicium. De la meme facon on etudie la pyrolyse d'allylgermolenes. Les mecanismes de reaction sont etudies

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8

Estel, Lionel. "Fonctionnalisation d'aminopyridines par métallation : application à la synthèse d'hétérocycles." Rouen, 1988. http://www.theses.fr/1988ROUES035.

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L'action d'aldéhydes aromatiques sur des pivalolaminopyridines ortho lithiées a donné des alcools secondaires qui ont été oxydés en cétones. Ceci permettant une synthèse en 4 étapes des amino-2 pyridyl-3, amino-3 pyridyl-4 et amino-4 pyridyl-3 arylméthanones. De la même façon, la fluoro-4 lithio-3 pyridine conduit à l'amino-4 pyridyl-3 phénylméthanone. Pour montrer l'intérêt de la méthode, des pyridopyrimidinones et des benzonaphtyridines ont été synthétisées. Par ailleurs, la fluoro-2 pyridine métallée, réagit avec l'iode pour donner des iodo-3 pyridines diversement substituées en 2. Une synt

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9

Pan, Shih-Yun, and 潘世允. "Effect of tacticity on the cyclization mechanism of polyacrylonitrile copolymers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4mhbb8.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>102<br>In this study, we synthesized polyacrylonitrile copolymers with controlled tacticity on the basis of the strategy of the bulk polymerization of acrylonitrile (AN) in the presence of magnesium chloride, and we selected methacrylate(MA) and dimethyl itaconate (DMI) as comonomer. All polyacrylonitrile copolymers were using 1H-NMR and 13C-NMR to identify its molecular structure, and the polymers’ molecular weights were characterized by gel permeation chromatography. Moreover, X-ray diffraction was utilized to determine the crystallinity; Fourier Transform Infra

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10

LeClair, Renee. "Elucidating the mechanism of triterpene cyclization using DNA synthesis and phylogenetic approaches." Thesis, 2005. http://hdl.handle.net/1911/18933.

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Nearly every aspect of sterol biosynthesis has been studied or exploited as means of regulating pathway flux, inhibiting specific enzymatic reactions, elucidating product cyclization or determining the evolutionary nature of the pathway itself. Despite enormous efforts in this area pathway regulation, product formation and the evolutionary origins of sterol biosynthesis remain unknown. Described herein is the use of molecular, synthetic and phylogenetic techniques to examine how oxidosqualene cyclases (OSC) (a specific enzyme within the sterol biosynthetic pathway) have evolved over time and h

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11

Lee, Chung-Chieh, and 李中傑. "The reaction mechanism study of 2,2''-di(phenylethynyl)-4,4''-disubstituted-biphenyls cyclization reaction." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/52538714499849983333.

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碩士<br>國立臺灣大學<br>化學研究所<br>93<br>2,2''-di(phenylethynyl)-biphenyls undergo thermal cyclization reaction at high temperature (260℃) to yield compound 6. To probe the reaction mechanism, a series of 2,2''-di (phenylethynyl)-4,4''-disubstitued-biphenyl were synthesized and then were subjected to the reeaction conditions . In order to differentiate the diradical or benzocyclobutadiene mechanism, we added tetraphenylcyclo- pentadienone to trap the intermediate. Cyclooctatetraene derivatives, which were derived from addition reaction of tetraphenylcyclopentadienone and benzocyclobutadiene intermediate

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12

Hossain, Mohammad Selim. "Scope and Mechanism of a Novel Base Induced Cyclization of Benzyl 1 Alkynyl Sulfones." Thesis, 2012. http://hdl.handle.net/10214/4580.

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Recent work has shown that sulfones are unique synthetic tools capable of undergoing numerous transformations and reactions. The sulfone group is a strong electron withdrawing group and has the ability to stabilize an α-sulfonyl carbanion. As such, unsaturated sulfones can undergo a variety of reactions, i.e. conjugate additions, alkylation etc. Beside this, α sulfonyl carbanion can be generated with strong base and α sulfonyl carbanion can also be used in various reactions. This report is an investigation of a novel base induced cyclization of various alkynyl sulfones. The results revealed th

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13

Hsu, Li-Jen, and 許力仁. "Gene Cloning of Monoterpene Synthases from Taiwania cryptomerioides and Illustration of the Secondary Cyclization Mechanism." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91020563572430491213.

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碩士<br>國立臺灣大學<br>森林環境暨資源學研究所<br>101<br>The ambiguous protein structure-function correlation of terpene synthases has been a challenge for protein engineers. Thus, we intended to decipher the determinants associated with the product specificity of terpene synthases. Using polymerase chain reaction (PCR) and rapid amplification of cDNA ends (RACE) methods, we successfully cloned two monoterpene synthase genes, Tc-αpin/teo and Tc-teo, from Taiwania cryptomerioides. The enzymes encoded by these genes shared 97% similarity of amino acid sequences, but had different terpene product profiles. We adopt

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14

Chuang, Chung-Lin, and 莊忠霖. "1,2,4-Triazines Chemistry: The Study on Reaction Mechanism of Rearrangement Cyclization, Oxidation, Bromination and Substitution Reactions." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52768817617861129359.

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碩士<br>高雄醫學大學<br>醫藥暨應用化學研究所碩士班<br>95<br>This study including synthesis and reaction mechanisms were divided into six parts. I. The base of mono and heterobicycles containing 1,2,4-triazine ring has synthesized. II. An intramolecular rearrangement- romatized ring cyclization mechanism for the compound 3-amino-2- benzyl-6-hydrazino-1,2,4-triazin-5(2H)-one(12) reacted with carbon disulfide in a water/pyridine mixture to afford bicyclic adduct 6-amino- 3-benzylmercaptor-1,2,4-triazolo[3,4-f][1,2,4]triazin-8(7H)-one(18) is explored. III. 3-amino-1,2,4-triazin-5(2H)-one(2) and its 6-bromo derivative

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15

Kim, Nam Ho 1975. "Mechanistic investigations of SpnF- and SpnL-catalyzed cyclizations in the biosynthesis of spinosyn A." Thesis, 2013. http://hdl.handle.net/2152/28735.

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Spinosyn A is a particularly interesting natural product due to its structural complexity and potent insecticidal activity. The biosynthetic pathway of spinosyn A is interesting as it has two unusual features, the SpnF-catalyzed (4+2) cycloaddition and the SpnL-catalyzed cyclization to produce the perhydro-as-indacene core. The work described in this dissertation focuses on elucidating the mechanisms of the SpnF- and SpnL-catalyzed reactions. SpnF has attracted significant interest as a possible Diels-Alderase. To explain how SpnF catalyzes the formation of cyclohexene ring, three plausible me

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16

XU, RUI-YOU, and 徐睿佑. "Mechanism of PdCl2-Catalyzed Cyclization of 3-alkyne-1,2-diols and isocyanate insertion to furanyl-3-carboxamides: A DFT Study." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/k9gkyv.

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碩士<br>國立中正大學<br>化學暨生物化學研究所<br>105<br>Abstract The Rajesh-Puri-Kant-Reddy mechanism of palladium coupling reaction has been investigated using DFT methods. The solution phase calculations were carried out using acetonitrile as a solvent in PCM model. It is found that the four step RPKR reaction mechanism actually consists of seven steps which are complexation, nucleophilic addition, dehydrochlorination, isocyanate insertion, dehydration, hydrogen chloride addition and catalyst regeneration. The dehydrochlorination is the rate-determining step for RPKR mechanism with relative Gibbs free energy

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17

Miles, Roy B. "Scope, selectivity, and mechanism of the Prins cyclization of delta, epsilon- and epsilon, zeta-unsaturated ketones with Lewis acids to 1,3-halohydrins /." 2006. 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:3242940.

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Thesis (Ph. D.)--University of Illinois at Urbana-Champaign, 2006.<br>Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6410. Adviser: Robert M. Coates. Includes bibliographical references. Available on microfilm from Pro Quest Information and Learning.

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18

Debnath, Pallavi. "Statistical Mechanical Models Of Structure And Dynamics In Macromolecules." Thesis, 2005. https://etd.iisc.ac.in/handle/2005/1510.

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19

Debnath, Pallavi. "Statistical Mechanical Models Of Structure And Dynamics In Macromolecules." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1510.

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20

Hsin-Tsung, Chen, and 陳欣聰. "Theoretical Studies of Reaction Mechanisms of 1. Nitrogen-containing Radicals 2. Cyclizations and Cycloadditions of Some Organic Reactions." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98535363432245253777.

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博士<br>國立臺灣師範大學<br>化學系<br>93<br>There are two major themes in this thesis. I. The study of nitrogen-containing radicals in the gas phase. It is of great interest because of the role these species play in the formation and removal of NOx pollutants in combustion processes. We report the possible reaction pathways of nitrogen-containing radicals by a theoretical method. There are two major paths in the subject and are given as follow. Part 1: Quantum-chemical calculations on the mechanisms of reaction of NCN with NO and NS. Possible mechanisms were classified according to four pathways yielding

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21

Zeidan, Tarek A. Alabugin Igor V. "Thermal and photochemical reactions of acetylenes I-ortho-effect in the Bergman cyclization of benzannelated enediynes ; II-photocycloaddition of diaryl acetylenes to cyclic dienes mechanisms and applications /." Diss., 2005. http://etd.lib.fsu.edu/theses/available/etd-09302005-153610.

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Thesis (Ph. D.)--Florida State University, 2005.<br>Advisor: Igor V. Alabugin, Florida State University, College of Arts and Sciences, Dept. of Chemistry and Biochemistry. Title and description from dissertation home page (viewed Jan. 25, 2006). Document formatted into pages; contains xvi, 346 pages. Includes bibliographical references.

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