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Dissertations / Theses on the topic 'Sigmatropic rearrangements'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Middleton, Mark L. "[2,3]-sigmatropic rearrangements of allylic amines." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245952.

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2

Buston, Jonathan Edward Hugh. "Asymmetric Meisenheimer rearrangements." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361334.

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3

Hughes, Deri. "[2,3]-sigmatropic N-O rearrangements in cyclic systems." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432282.

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4

Ferguson, John Alasdair Kerr Jamie. "Some sigmatropic rearrangements of polyfluoroaromatic and heteroaromatic compounds." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6870/.

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This Thesis describes some [3,3] and [2,3] -sigmatropic rearrangements that can occur in a variety of polyfluoroaromatic and -heteroaromatic compounds. The presence of fluorine on the aromatic moiety precludes the normal rearomatization process. The work is conveniently divided into two parts. Part A concerns the preparation and thermal (Claisen) rearrangement of derivatives of allyl 5-fluoropyrimidin-4-yl ether. These rearrange upon thermolysis to give isomers in which the terminus for the migration of the allyl group is N-3, provided that there is no preceding reaction which localises a doub

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5

McLachlan, Steven Paul. "Enantioselective [2,3]-Wittig-[3,3]-anionic oxy-cope tandem rearrangements." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250470.

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6

Wilton, Donna Anthea Alexandra. "Catalytic asymmetric [3,3]-sigmatropic rearrangements for complex molecule synthesis." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611832.

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7

Grout, Sarah Louise. "Investigations in Acyclic Stereocontrol: from Tandem Sigmatropic Rearrangements to Nucleophilic Additions." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490609.

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8

Workman, James A. "Sigmatropic rearrangements : studies towards the asymmetric synthesis of neuroexcitatory amino-acids." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408204.

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9

Rigby, Suzie S. "Sigmatropic and haptotropic shifts in complexes of cyclopenta(l)phenanthrene." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0020/NQ30185.pdf.

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10

Doyon, Julien Georges Pierre-Oliver. "Application of the sigmatropic and electrocyclic rearrangements to the rapid construction of polycyclic carbogens /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487861796819656.

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11

He, Wei. "Application of (3,3)-sigmatropic rearrangements to the rapid elaboration of complex molecules including natural products /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1341508945.

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12

Coulson, Bethan. "Sigmatropic rearrangement-metathesis based approaches to cyclopentadienes." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59037.

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This thesis is divided into four chapters. Chapter one is a review of cyclopentadienes (Cps), and is split by sub-classification of applications in organometallics, applications in organic methodology, synthesis of complex Cps from post carbocycle modification and de novo synthesis of Cp. Chapter two introduces the decarboxylative Claisen rearrangement (dCr) and details investigations of the application of this reaction towards Cp synthesis using three different activating groups. Chapter three focuses on the decarboxylative Claisen rearrangement (dCr) from a computational aspect. It begins wi

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13

Hsieh, Yihhuang. "Reexamination of a putative (1s,4s) sigmatropic rearrangement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq24160.pdf.

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14

Blid, Jan. "Asymmetric [2,3]-Sigmatropic Rearrangement of Allylic Ammonium Ylides." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-430.

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15

Flaherty, Alice. "The aza-[2,3]-Wittig sigmatropic rearrangement : versatility and applications." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342469.

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16

Siddons, D. Craig. "Investigations into the stereoselective aza-[2,3]-Wittig sigmatropic rearrangement." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286515.

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17

Tavassoli, Ali. "Factors affecting the [2,3]-sigmatropic rearrangement of didehydropiperidinium ylides." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297638.

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18

Chambers, David. "Synthesis of Î±- and Î²-C-glycosides via sigmatropic rearrangement :." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409730.

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19

Hartley, Richard Charles. "Stereospecificity and stereoselectivity in the [2,3] sigmatropic sulphonium ylide rearrangement." Thesis, University of Cambridge, 1991. https://www.repository.cam.ac.uk/handle/1810/272601.

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20

Yanagi, Tomoyuki. "Studies on Biaryl Synthesis via Sigmatropic Rearrangement of Arylsulfonium Species." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263499.

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21

Ponce, Mélanie. "Asymmetric studies of [1,2]- and [2,3]- sigmatropic rearrangement of ammonium ylids." Thesis, University of Reading, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541988.

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22

Apel, Caroline [Verfasser]. "Development and Application of an Organocatalytic [3,3]-Sigmatropic Rearrangement / Caroline Apel." Berlin : Freie Universität Berlin, 2020. http://d-nb.info/1215572387/34.

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23

Fretwell, Mark. "Asymmetric synthesis of cyclic ethers via a tandem carbenoid insertion and ylide rearrangement strategy." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324477.

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24

Tran, Fanny. "Catalytic asymmetric synthesis of pyrrolidine carboxylic acids via tandem heck reaction [2,3]-sigmatropic rearrangement." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499363.

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Kainoid amino acids are natural biological active pyrrolidine dicarboxylic acids with potent neuroexcitatory activity as well as insecticidal and anthelmintic properties. They possess 3 stereogenic centres, which represent considerable challenges for synthetic chemists. We speculated that a tandem asymmetric Heck arylation reaction and [2,3] sigmatropic rearrangement would provide a quick and efficient way to access these pharmacological active molecules.

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25

Deacon, Neil. "Asymmetric synthesis of α-amino phosphonates via organocatalytic sulfenylation and [2,3]-sigmatropic sulfimide rearrangement". Thesis, Imperial College London, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544294.

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26

Walls, Steven B. "The synthesis of medium-ring carbocycles by tandem oxonium ylide generation and [2,3]-sigmatropic rearrangement." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416880.

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27

Hansen, K. Emelie. "Synthesis of O-Heterocycles : the [2,3]-sigmatropic rearrangement of transition metal carbenoid-generated allylic oxonium ylides." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3654/.

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In many natural products, heterocycles, such as cyclic ethers, are important features. While there are many different approaches to the formation of these ethers, there are only a few methods available for the synthesis of substituted cyclic ethers with good diastereoselectivity and even less so with good enantioselectivity. The rearrangement of oxonium ylides has proved to be a versatile method for the stereoselective synthesis of cyclic ethers. However, to date, there is no general efficient enantioselective method for the rearrangement of oxonium ylides. This project aimed to develop an ena

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28

Whiting, Matthew Peter. "The silicon assisted Aza-[2,3] Wittig sigmatropic rearrangement : total synthesis of (+/-)-kainic acid and chirality transfer." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405386.

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29

Swarbrick, Martin Edward. "The aza-[2,3]-Wittig sigmatropic rearrangement and its application to the synthesis of cyclic amino acids." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267122.

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30

Pollex, Annett. "Viridiofungins and xeniolide F: target oriented synthesis using different rearrangement reactions of a common substrate class." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1160474365794-44380.

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The present dissertation covers the total synthesis of viridiofungin triesters and studies toward the total synthesis of xeniolide F. In both cases, sigmatropic rearrangements of α-allyloxy substituted α,β-unsaturated esters are employed: for the viridiofungin ester synthesis a [2,3]-Wittig rearrangement and for the xeniolide F synthesis a catalytic asymmetric Claisen rearrangement CAC. For both rearrangement reactions the historical development, main characteristic and important variations are discussed. The viridiofungin triester synthesis represents a convergent and highly flexible route to

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31

Abdulla, Othman. "[1,2]-Sigmatropic rearrangement of benzylic ammoniumy lids ; Catalytic sp3-sp3 functionalisation of sulfonamides ; Annulation of arynes in the synthesis of sultams." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34758/.

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The first chapter in this thesis describes research on the asymmetric [1,2]-sigmatropic rearrangement of benzylic ammonium ylids. Our group previousely developed method showing that DMSO as solvent, and BTPP as base, in the presence of 5Å molecular sieves, dramatically improves the yield of the reaction. Hence, we applied the developed the method using8-(–)-phenylmenthol and (2S)-camphorsultam as chiral auxiliaries. In the second chapter, a new application of Pd-catalysed allylation is reported. This enabled the synthesis of (30)of branched sp3-functionalised sulfonamides, a compound class fo

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32

Pham, Thi-Nhan Nguyen. "Thio-rearrangement de claisen : facilite, reversibilite, synthese de composes thiocarbonyles." Caen, 1987. http://www.theses.fr/1987CAEN2045.

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33

Ernouf, Guillaume. "Réarrangements sigmatropiques - Synthèse de cyclopropanes fonctionnalisés." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066719/document.

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Les cyclopropanes sont rencontrés dans de nombreux produits naturels ou synthétiques bioactifs. Les travaux exposés dans ce manuscrit portent sur le développement de réarrangements sigmatropiques [3,3] impliquant des dérivés de cyclopropénylcarbinols pour accéder à des alkylidènecyclopropanes fonctionnalisés, précurseurs de cyclopropanes diversement substitués. Le réarrangement des cyanates de cyclopropénylcarbinyle a permis d'obtenir des dérivés N-acylés d'alkylidène(aminocyclopropanes). Une méthode efficace et stéréosélective, impliquant le réarrangement d'Ireland-Claisen des glycolates et g

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34

Eagan, Robert Lee. "Investigation of the steric and/or electronic effects associated with the (1,5)-sigmatropic rearrangement of 1-substituted-2,3,4,5-tetraphenyl- 2,4-cyclopentadien-1-ols." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/74730.

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A series of eight l-substituted-2,3,4,5-tetraphenyl-2,4-cyclopentadien-l-ols were efficiently synthesized by the addition of the appropriate organometallic reagent to tetracyclone. It was determined that the steric and electronic nature of the migrating groups played a predictable role in the [l,5]-sigmatropic rearrangement of these compounds. Electron donating groups increased the rate of migration whereas electron withdrawing substituents were responsible for slowing the migration. Likewise, smaller groups accelerated the rate while bulky groups deterred the migration. Consequently, the expe

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35

Jawabrah, Al-Hourani Baker Salim Yacoub. "Generation and Succeeding Reactions of Allenyl Isothiocyanates." Doctoral thesis, Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200501355.

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In this work, the [3,3] sigmatropic rearrangement of different substituted propargyl thiocyanates and double [3,3] sigmatropic rearrangement of enynyl isothiocyanates either by flash vacuum pyrolysis or by thermolysis in solution are studied. Additionally, the intramolecular reactions of the resulting allenyl isothiocyanates are studied, and the reaction mechanisms for the generation of the final products, such as [1,5] sigmatropic migrations or electrocyclic ring closures, are explained. These highly reactive allenyl isothiocyanates are used as appropriate electrophilic precursors for the pre

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36

Henrion, Sylvain. "Étude et applications du réarrangement sigmatropique [3,3] d'allyl cyanates pour la synthèse de molécules d'intêret biologique." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S163.

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De nos jours, parmi toutes les transformations chimiques dont disposent les chimistes organiciens, le réarrangement sigmatropique [3,3] constitue un outil puissant afin de créer une liaison C-C ou encore C-hétéroatome. Le réarrangement d’allyl cyanate en allyl isocyanate, jusqu’ici peu utilisé, est en train d’émerger, comme une nouvelle méthode efficace de préparation d’allylamines substituées. C’est dans ce contexte que s’inscrit mon travail de thèse qui a pour objectif d’étudier et d’utiliser le réarrangement sigmatropique [3,3] d’allyl cyanates diversement substitués pour la synthèse de mol

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37

Le, Cornec-Macé Aurélie. "Synthèse et étude de la réactivité de nouveaux allylboronates alpha-hétérosubstitués." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S176/document.

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Au cours de ces trente dernières années, les allylboranes, une classe particulière de composés organoborés, ont pris une place particulièrement importante en synthèse organique, principalement dans la synthèse stéréocontrôlée d'alcools homoallyliques par addition sur un aldéhyde. C'est dans ce contexte que s'inscrit mon travail de thèse qui a pour objectif la mise au point de voies d'accès originales à deux familles d'allylboronates alpha-hétérosubstitués et à l'étude de leur réactivité. Pour cela, nous nous sommes intéressés dans un premier temps au comportement de gamma-borylallylsilanes vis

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38

Jean-Bart, Nicolas. "Catalyse au rhodium et biomolécules : synthèse, structures et applications." Electronic Thesis or Diss., Toulouse 3, 2023. http://www.theses.fr/2023TOU30359.

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Les travaux de thèse effectués se sont intéressés à la synthèse de catalyseurs au dirhodium (II) comportant un environnement peptidique et l'emploi de la catalyse au dirhodium (II) pour l'accès à des cyclopropanes impliquant des approches non conventionnelles. D'une part, nous avons à travers les travaux effectués, cherché à accéder à un catalyseur au dirhodium (II) inséré dans des peptides pouvant former des structures amyloïdes. L'accès à une telle espèce a été exploré sur la base d'un dipeptide formant des structures de type amyloïdes mais présentant néanmoins une structure cristalline. Deu

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39

Richter, Frank. "Development of the Solution-Spray Flash-Vacuum-Pyrolysis Technique in the Synthesis of Allenyl Isothiocyanates and Synthesis of Complex 2-Amino-1,3-thiazole Derivatives." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-175339.

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Gas-phase thermolysis is a long-known and well established method for the preparation of reactive species. It is, however, limited to relatively volatile substances, which are easily vaporised. In the present work, the solution-spray technique for preparative scale was developed. With this technique, it is possible to subject low-volatile substances, which hardly vaporise even under high-vacuum conditions, to gas-phase thermolysis. By utilising oil nozzles used in heating and burner systems, it was possible to integrate a stable solution-spray into the existing flash-vacuum-pyrolysis system. T

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40

Grimster, Neil Patrick. "New strategies for chemical synthesis : 1) Development of a palladium-catalyzed direct C-H alkenylation of indoles by solvent-controlled regioselective C-H bond functionalisation; 2) Studies towards the development of a catalytic diastereoselective [3,3] sigmatropic rearrangement at ambient temperature." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612869.

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41

Tomakinian, Terry. "Nouvelles méthodes de synthèse de benzofuroindolines. Vers la synthèse de la phalarine." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS031.

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Les benzofuroindolines forment une famille de composés qui se retrouvent sous deux formes : les benzofuro[2,3-b]indolines ou les benzofuro[3,2-b]indolines. Ce motif se retrouve dans de nombreuses molécules naturelles comme la bipleiophylline, la voacalgine A, le diazonamide A et la phalarine ce qui a mené à de nombreuses recherches pour leur synthèse. La biogénèse postulée est le couplage oxydant d'un indole et d'un phénol. Nous avons développé plusieurs voies d'accès à ces motifs en utilisant le noyau indolique. La première étude a consisté en un couplage oxydant direct entre un N-acétylindol

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42

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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43

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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44

ARYA-MORTEZAEI, FARIBA. "Reactivite thermique de n-alcenyliminocetenes." Reims, 1987. http://www.theses.fr/1987REIMS010.

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Les composes du titre conduisent a differentes cetones heterocycliques : desazepinones-4, des aza-3bicyclo (3. 2. 0)heptenes-2ones-7, des formyl-3 pyridinones-4. Les azobicyclohepotenones conduisent a des pyrrolidines et a des oxaziridines polycylcliques

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45

Ramadhar, Timothy Ramesar. "Synthetic and Theoretical Investigations of [3,3]-Sigmatropic Rearrangements and Development of Allylboration Reactions." Thesis, 2012. http://hdl.handle.net/1807/34859.

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A summary of research conducted since September 2007 at the University of Toronto in the laboratory of Professor Robert A. Batey is presented in this thesis, which is divided into four chapters. The first chapter contains a two-part introduction, where aryl- and aliphatic-Claisen rearrangements are discussed in part 1, and the nucleophilic addition of organoboron reagents to unsaturated C–N functionalities is described in part 2. Chapter 2 contains research involving synthetic and theoretical studies of aryl-Claisen rearrangements and other sigmatropic reactions. The work towards developing th

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46

Lee, Ernest Edward. "Palladium(II) catalyzed formal [3,3]-sigmatropic rearrangement of (Allyloxy) iminodiazaphospholidines /." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=442424&T=F.

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47

Yahiaoui, Ossama. "Synthesis and Network Analysis of Substituted Bullvalenes and the Total Synthesis of Endiandric Acid J and Beilcyclone A." Thesis, 2020. http://hdl.handle.net/2440/127281.

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This thesis is divided into two topics, 1) the synthesis and analysis of bullvalene and substituted bullvalene, 2) and the synthesis of endiandric acid J and beilcyclone A. Bullvalene is the epitome of fluxional molecules. This C10H10 hydrocarbon undergoes an infinite succession of fast sigmatropic Cope rearrangements and exists as an ensemble of 1, 209, 600 degenerate isomers. Substituents on this core structure will explore all possible non– degenerate isomers. Mono substituted bullvalene for instance exists between 4 isomers and disubstituted bullvalene with unidentical substituents interco

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48

Dorich, Stéphane. "Synthèse totale de la pactamycine et d’une sélection d’analogues, progrès vers la synthèse totale de la daphniglaucine C et brève étude d’une transposition allylique réductrice." Thèse, 2013. http://hdl.handle.net/1866/10129.

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Il y a plus de cinquante ans, la pactamycine a été isolée en tant qu’agent antitumoral potentiel. Il a été réalisé plus tard qu’il s’agissait en fait d’un agent antibactérien capable d’inhiber la synthèse de protéines lors du procédé de traduction. Récemment, il a même été démontré que certains de ses analogues possèdent des propriétés antiprotozoaires prometteuses. La présente thèse détaille la première synthèse totale de la pactamycine, entreprise au sein du groupe Hanessian, ainsi que la préparation d’une sélection d’analogues testés pour leurs propriétés biologiques. En outre, la daphnig

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49

Tjeng, Andy. "Stereoselective Synthesis of Nitrogen Containing Compounds from Hydroxy Allylic Azides." Thesis, 2012. http://hdl.handle.net/1807/42602.

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This thesis describes research conducted since September 2006 in Prof. Robert Batey’s laboratory. The thesis is divided into four chapters. Chapter one presents a general introduction of domino reactions, sigmatropic rearrangements, and the allylic azide rearrangement. Several factors affecting the allylic azide rearrangement along with some respective examples are presented. Chapter two describes an efficient synthesis of azido unsaturated ester compounds using a microwave-assisted domino allylic azide / Johnson-Claisen rearrangement. The domino rearrangement reaction proceeds to give the a

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50

Ho, Guo Ming, та 何國銘. "1.Chiral [3,3]-sigmatropic Rearrangement Studies of γ-Allyloxy Substituted Vinylogous Urethane 2. [2,3]-Wittig Rearrangement Studies of γ- 2∘Allyloxy Substituted Vinylogous Urethane 3.Asymmetric [2,3]-Wittig Rearrangement Studies and Synthetic A". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/41734933025861545871.

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碩士<br>國立嘉義大學<br>應用化學系研究所<br>94<br>1. Chiral [3,3]-Sigmatropic Rearrangement Studies of γ-Allyloxy Substituted Vinylogous Urethane Pyrrolidine derivatives 1 and 2 were condensed with various of achiral γ-allyloxy substituted ketoesters to generate vinylogous urethanes. Thermo [3,3]-Sigmatropic rearrangement of these vinylogous urethanes were studied to investigate their reactivities and diastereoselectivities . 2. [2,3]-Wittig Rearrangement Studies of γ- 2∘Allyloxy Substituted Vinylogous Urethane Racemic and chiral γ- 2∘cyclic allyloxy substituted vinylogous urethane were used t

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