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Dissertations / Theses on the topic 'Nucleophilie'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Lucius, Roland. "Kinetische Untersuchungen zur Nucleophilie stabilisierter Carbanionen." Diss., [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963933760.

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2

Venier, Olivier. "Etude de la nucleophilie intramoleculaire du groupe boc : nouvelles cyclisations en synthese asymetrique." Paris 6, 1997. http://www.theses.fr/1997PA066573.

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Le traitement des n-boc aminoalcools par le chlorure de tosyle conduit au moyen d'une reaction de cyclisation aux oxazolidin-2-ones correspondantes. Une heterocyclisation similaire est observee avec des analogues soufres des carbamates : les dithiocarbamates. Un effet thorpe-ingold peu courant est observe et est etudie au moyen de calculs am1. Par ailleurs, des epoxyoxazolidines enantiopures sont obtenues en deux etapes a partir d'alcenyloxazolidines. L'etape-cle de ces syntheses est une reaction de cyclocarbamation. L'ouverture de ces epoxydes au moyen de differents nucleophiles (azoture, cup

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3

GRELLIER, MARY. "Nucleophilie des amines tertiaires vis-a-vis des complexes eta#3-allylpalladium : application a la synthese d'heterocyles." Université Louis Pasteur (Strasbourg) (1971-2008), 1996. http://www.theses.fr/1996STR13116.

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La reaction des amino-olefines en presence d'une quantite stoechiometrique de pd(ii) et d'une base conduit a la formation de composes eta#3-allylpalladium. Un traitement de ces complexes avec un exces de pph#3 provoque une demetallation induisant la formation selectivement d'un heterocycle et de pd(o). L'utilisation de quantite catalytique de pd(ii), implique l'emploi de 1,4-benzoquinone permettant l'oxydation du pd(o), produit au cours de l'etape de demetallation des complexes eta#3-allylpalladium, en pd(ii). La catalyse, utilisant le pd(o), implique la modification des reactifs. Il faut intr

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4

Koller, Stephan G. [Verfasser], Carsten [Akademischer Betreuer] Strohmann, and Klaus [Gutachter] Jurkschat. "Wechselspiel zwischen Basizität und Nucleophilie von Alkyllithiumverbindungen: ungewöhnliche Reaktionen an Organosilanen / Stephan G. Koller. Betreuer: Carsten Strohmann. Gutachter: Klaus Jurkschat." Dortmund : Universitätsbibliothek Dortmund, 2015. http://d-nb.info/111166871X/34.

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5

Antonsson, Rositha. "Nucleophilic aromatic substitutions using ethyl 3-mercaptopropionate as nucleophile : Scope and limitations." Thesis, Södertörn University College, School of Life Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-1517.

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<p>The scope and limitations of nucleophilic substitutions of aryl halides have been studied using ethyl 3-mercaptopropionate as nucleophile and microwave heating. A diversity of aromatic compounds have been investigated according to different types of leaving groups, regio isomers and substituents. Experimental design has been used as a tool to optimize the reaction. An electron-withdrawing group in ortho or para position of the leaving group proved to be necessary for a positive outcome of the reaction. Fluorine was, without competition, the best leaving group. Some examples of how the synth

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6

Annandale, Michael Thomas. "NMR spectroscopic studies of nucleophilic attack on dinitroaniline herbicides, reactions of selected nucleophiles with trifluralin and benefin." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22268.pdf.

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7

Omakor, Emegbero John. "The reaction mechanism and Ã-effect in nucleophilic displacement at the phosphorus center of the pesticide, fenitrothion, by oxygen nucleophiles in aqueous medium." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22373.pdf.

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8

Harris, David T. "New Nucleophilic Organocatalysts." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144597.

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Acyl-transfer reactions have become commonplace in organic synthesis and organocatalysis of these reactions is becoming increasingly popular. 4-Dimethylaminopyridine has proven to be very useful in acylations; over the recent years chiral and more reactive analogs have received much attention. Interestingly, catalysis of acyl-transfers by diamines has also been shown to be effective. We present the synthesis of several DMAP analogs containing heteroatoms near the nucleophilic nitrogen. These analogs of DMAP vary from basic amidines, oxazolines, and amines, to alcohols, and fluoro-derivatives a

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9

Thompson, Claire. "Aromatic nucleophilic nitration." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390199.

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10

Lees, Inez Nancy Lloyd. "Nucleophilic polymers for scavenging." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613095.

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11

Wilson, Jonathan E. Ph D. Massachusetts Institute of Technology. "Enantioselective nucleophile-catalyzed cycloadditions." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40973.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2007.<br>Vita.<br>Includes bibliographical references.<br>Chapter 1 describes the development of an asymmetric nucleophile-catalyzed [2+2] cycloaddition of ketenes with aldehydes. This is the first report of a catalytic enantioselective synthesis of trisubstituted [beta]-lactones. Two enantioselective phosphine-catalyzed [3+2] cycloadditions of allenoates are detailed in Chapter 2. A method for the asymmetric synthesis of cyclopentenes via a [3+2] cycloaddition of allenoates with enones is first discussed. This is foll

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12

Curti, Christophe. "Recherche de nouveaux agents pharmacologiques par synthèse et réactivité Srn1[substitution radicalaire nucleophile unimoléculaire] d' alpha-halocétones et par réaction VNS [vicarious nucleophilic substitution of hydrogen] de 5-nitroimidazoles." Aix-Marseille 2, 2006. http://www.theses.fr/2006AIX22960.

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Ce travail est consacré à la recherche de nouveaux agents pharmacologiques par synthèse et réactivité SRN1 d’a-halocétones et par réaction VNS de 5-nitroimidazoles. La première partie décrit la réactivité SRN1 et ses différentes applications. La seconde partie met en évidence les intérêts de l’irradiation micro-ondes en synthèse organique. Nous abordons ensuite dans les troisième, quatrième et cinquième parties les études de synthèse et de réactivité d’a-halocétones en séries benzénique, thiophénique et pyrrolique. Chaque série a fait l’objet d’une étude mécanistique SRN1 avec l’anion du 2-nit

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13

Wei, Yin. "Theoretical Studies in Nucleophilic Organocatalysis." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-95248.

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14

Maryasin, Boris. "Theoretical investigations in nucleophilic organocatalysis." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-138820.

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15

Cresswell, Alex. "New methods for nucleophilic fluorination." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:612ea592-2f52-407b-b761-36b02b746e9d.

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This thesis describes investigations into the utility of boron fluorides and tetrafluoroborates as sources of nucleophilic fluorine. Chapter 1 discusses the history and importance of the field of organofluorine chemistry and outlines some of the principle motivations for the site-selective fluorination of organic molecules. Some of the most commonly useed methods of nucleophilic fluorination are briefly surveyed, with an emphasis on the formation of fluorinated stereogenic centres. Literature precedent for the use of tetrafluoroborates and boron trifluoride as nucleophilic fluorinating agents

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16

Murray, Christopher B. "New methodology for nucleophilic fluorination." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/3687/.

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This work describes the development of three methods for the fluorination of electrophilic substrates:1.) The reaction of caesium fluoride with perfluoro(2-methylpent-2-ene) leads to the formation of perfluoro(2-methylpentan-2-yl)caesium. This perfluoroalkyl carbanion has been shown to undergo significant fluoride ion exchange at temperatures above 60 C. Thus, reaction of a solution of the carbanion with a suitable electrophile resulted in the selective formation of a carbon-fluorine bond or perfluoroalkylation of the electrophile.2.) Caesium fluoride has been developed as a moderately effecti

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17

Kennedy, R. J. "Copper-promoted nucleophilic aromatic substitution." Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355148.

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18

Haleem, Asad Bilal. "Crosslinking nucleophilic dyes on cotton." Thesis, University of Leeds, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250890.

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19

Salim, A. M. "Nucleophilic cleavage of organic disulphides." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381243.

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20

De, Pascale Maria Egizia. "Asymmetric nucleophilic addition to vinylphosphonates." Thesis, King's College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407452.

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21

PERROTEY, ANNE. "Substitution nucleophile et lithiation d'arenetricarbonylchrome." Paris 6, 1996. http://www.theses.fr/1996PA066325.

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Dans la premiere partie de ce travail, nous avons etudie la regioselectivite de l'addition d'anions stabilises de nitriles ou d'esters sur le complexe de la benzophenone et de ses derives dans le but de synthetiser un precurseur du ketoprofene. Nous avons ensuite envisage une autre voie de synthese du ketoprofene: une substitution nucleophile ipso d'un atome d'halogene. Dans un premier temps, nous avons etudie la regioselectivite de la lithiation du complexe de la benzophenone protegee par un acetal (premiere etape avant l'halogenation). Dans la deuxieme partie, nous avons tente de lithier dia

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22

Chan, Mary S. W. "Factors influencing the regiochemistry of nucleophilic addition to the radical cation of alkenes and dienes studied in the context of the photochemical nucleophile-olefin combination, aromatic substitution (photo-NOCAS) reaction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ36574.pdf.

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23

Maji, Biplab. "Reactivity parameters for understanding nucleophilic organocatalysis." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-148415.

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24

Husein, Maen. "Nucleophilic sulfonation in microemulsions and emulsions." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36814.

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The nucleophilic sulfonation of decyl halides and benzyl halides was carried out at 298.2 K in batches in o/w microemulsions and emulsions formed with the two-tailed cationic surfactants dioctyldimethylammomum chloride, R2(Me)2N +Cl-, or bromide, R2(Me) 2N+Br-. The effects of mixing, surfactant concentration and counterion, and reactant concentrations on the conversion of the halide were investigated. At the concentrations employed, phase separation occurred in most of the samples. Mixing did not affect the sulfonation of decyl halides, while it governed the sulfonation rate of benzyl halides.

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25

Fraser, Georgina. "Ionic liquid effects on nucleophilic substitutions." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/17827.

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In this thesis we demonstrate a fundamental difference between nucleophilic substitution reaction mechanisms in ionic liquids versus conventional solvents. Reported herein are the effects of ionic liquid solvents on substitution reactions between a cationic electrophile and the chloride anion of various organic and inorganic salts. We have combined novel quantitative studies of the nucleophilic source [Cat]Cl with our studies of [C4C1im]Cl and compared their reactivities, k2. For the first time, Eyring activation parameters have been calculated for substitution reactions between charged specie

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26

KHOURZOM, RAMI. "Les complexes arenetricarbonylchrome : substitution nucleophile aromatique." Paris 6, 1990. http://www.theses.fr/1990PA066564.

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Les travaux realises au cours de cette these permettent d'illustrer les proprietes originales des complexes arenetricarbonylchrome. Les anions en alpha d'un groupement sulfonyle agissent sur des halogeno-benchrotrenes selon des substitutions nucleophiles aromatiques ipso, cine, tele-meta et tele-para. L'addition de l'anion secondaire sur les isomeres du fluoro- et chlorotoluenetricarbonylchrome est a la fois regio- et diastereoselective. La fluoration des chloro-benchrotrenes fournit les complexes resultant d'une coupure de la liaison carbone-chlore. Nous avons egalement mis au point l'additio

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27

Sohal, Gian Singh. "Reversible nucleophilic addition : a new approach to asymmetric catalysis." Thesis, University of Bath, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341684.

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28

Tandon, Raman. "Tailor-Made highly nucleophilic pyridines for organocatalysis." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-157028.

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29

Nguyen, Huy Van. "Metallocene-Pyrrolidinopyridine Nucleophilic Catalysts for 1.V." Thesis, Queen Mary, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498184.

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30

Martin, Peter Arnold. "Nucleophilic substitution reactions of some polyhalogenated compounds." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6876/.

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Rate measurements for the reactions of a series of polyfluoro - and polychloro - pyridines with aniline and ammonia in 60/40 dioxan/water at 25ºC has shown that chlorine, when ortho and para to the position of attack, is activating with respect to fluorine, but at the position meta to the point of attack, chlorine and fluorine are virtually equivalent in their effect on reaction rate. The trifluoromethyl and nitrile groups were found to be activating relative to fluorine when ortho and para to the position of substitution and the nitrile group was thus found to be ortho/para directing. The ort

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31

Hinch, Melissa Marie. "Catalytic asymmetric nucleophilic epoxidation of aliphatic enones." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425622.

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32

Lau, J. C. Y. "The mechanism of nucleophilic substitution at silicon." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374491.

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33

Aspinall, Garreth Martyn. "An investigation of nucleophilic cleavage of siloxanes." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396724.

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34

Drees, Paul Frederick. "Secondary Isotope Effects of Nucleophilic Vinylic Substitution." W&M ScholarWorks, 1986. https://scholarworks.wm.edu/etd/1539625350.

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35

Lester, Roy P. "Catalytic activation of nitriles towards nucleophilic addition." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28449/.

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The work presented in this thesis is focused on the development of a multifaceted approach to the catalytic activation of nitriles. To develop a versatile method for catalytic nitrile activation two probes were utilised; i) the development of a direct synthesis of allylic amides from the corresponding allylic alcohol and nitrile using a commercial platinum salt, together with a detailed mechanistic investigation into the process, ii) the direct synthesis of 2-bezoxazole from the corresponding 2-aminophenol and nitrile with the aid of a commercial platinum salt as well as the use of alcoholic s

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36

Bug, Thorsten. "Nucleophile Reaktivität von Diazoverbindungen und stabilisierten Carbanionen." Diss., lmu, 2003. http://nbn-resolving.de/urn:nbn:de:bvb:19-15655.

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37

Bug, Thorsten. "Nucleophile Reaktivität von Diazoverbindungen und stabilisierten Carbanionen." [S.l.] : [s.n.], 2003. http://edoc.ub.uni-muenchen.de/archive/00001565.

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38

Dema, Haythem Karim. "Chiral aldimines in diastereoselective carbon nucleophile additions." Doctoral thesis, Universidad de Alicante, 2012. http://hdl.handle.net/10045/27136.

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39

ZAHNEISEN, THOMAS. "Reactivite nucleophile et electrophile des anions chloroallyliques." Paris 6, 1992. http://www.theses.fr/1992PA066372.

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Des carbenoides allyliques peuvent etre crees par simple deprotonation de l'halogenure allylique correspondant avec une base forte telle que le litmp, lda ou sec buli. L'addition du litmp a temperature ambiante dans un melange de chlorure ou bromure de prenyle et d'olefine conduit aux cyclopropanes vinyliques avec des rendements de 30 a 60%. Le carbenoide (carbene) intermediaire est electrophile, reagissant plus facilement avec des olefines riches en electrons. Les halogenures allyliques moins substitues donnent des rendements inferieurs. La meme technique par creation in situ du carbenoide, p

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40

Hajr, Hadjar. "Investigating Nucleophile Scope in N-Acyliminium Ion." Thesis, Uppsala universitet, Institutionen för läkemedelskemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-450357.

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41

Nigst, Tobias Alexander. "Reactivity parameters for nitrogen nucleophiles." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-149989.

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42

Michel, Kristin. "Additionen von Nucleophilen an Oxiranylimine /." Münster, 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000276784.

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43

Bonten, Maurice. "Methoden zur asymmetrischen nucleophilen Glyoxylierung." Aachen Mainz, 2007. http://d-nb.info/1001737571/34.

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44

Colombe, James Robert. "New applications of heteroarylzinc nucleophiles." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101547.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>This thesis describes the development and application of chemical methodologies for the use of 2-pyridyl and other aryl and heteroaryl organometallic nucleophiles. Aiming for a practical and effective alternative to 2-pyridylboron reagents, a solid 2-pyridylzinc compound was prepared and is described in Chapter 1. Chapter 2 details a new approach to the synthesis of sulfonamides using aryl and heteroaryl organozine nucleophile

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45

SEMRA, ASSIA. "Substitutions nucleophiles en serie arenetricarbonylchrome." Paris 6, 1987. http://www.theses.fr/1987PA066622.

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46

Iagrossi, Anna. "Stereochemical studies of reactions of phosphate and thiophosphate esters." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/33748.

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Nucleophilic substitution reactions involving phosphate monoesters have been investigated. Two general syntheses of O-alkyl or O-aryl [16O,18O] thiophosphate monoesters are reported. An independent and general method for the determination of the enantiomeric excess of isotopically chiral thiophosphate monoesters has been developed and the absolute configurations of the diastereoisomers of (2R)-O-(O-ethyl thiophosphoryl)-3, 4S-dimethyl-5S-phenyl-l,3,2-oxazaphos- pholidin-2-one have been assigned. The solvolysis of p-nitrophenyl [R-16O,18O] thiophosphate in ethanol gives rise to ethyl [16O, 18O]

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47

Shen, Bin. "Studies on the nucleophilic aromatic 18 F-Fluorination from model compounds to aromatic amino acids /." [S.l. : s.n.], 2008.

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48

Whitmore, James Michael John. "Kinetic studies of nucleophilic displacement at heteroaromatic centres." Thesis, University of Kent, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386135.

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49

Jones, Craig Warren. "Nucleophilic aromatic substitution using supported copper(I) reagents." Thesis, University of York, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236184.

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50

Beaumont, Andrew J. "A study of some selective nucleophilic fluorination reactions." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306248.

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