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Dissertations / Theses on the topic 'Fischer carbenes'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Bezuidenhout, Daniela Ina. "Multimetal complexes of Fischer carbenes." Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/28973.

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Fischer carbene complexes of the Group VI transition metals (Cr, Mo and W) containing at least two or three different transition metal substituents, all in electronic contact with the carbene carbon atom, were synthesized and studied both in solution and in the solid state. For the complexes of the type [M(CO)5{C(OR)R’}], the substituents chosen included (hetero)aromatic (benzene or thiophene) rings π-bonded to a chromium tricarbonyl fragment or ferrocene as the R’-substituent, while the OR-substituent was systematically varied between an ethoxy or a titanoxy group, to yield the complexes 1 (M

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2

Germaneau, Romain. "Amphiphilic sugar metal carbenes : from fischer type to N-Heterocyclic carbenes (NHCs) : investigations on potential gelation and catalytic activities." Paris 6, 2007. http://www.theses.fr/2007PA066209.

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Le travail présenté ici décrit, en quatre parties, la synthèse d’une nouvelle famille de complexes N-hétérocycliques carbèniques amphiphiles. Le remplacement du carbène de Fischer, présent dans la structure sur laquelle le travail est basé, par un groupe NHC est apparu difficile. Ce problème a pu être résolu par l’utilisation de différents espaceurs. Utilisant une méthode à base d’oxyde d’argent, une nouvelle famille de systèmes amphiphiles comportant un carbène de type NHC du chrome fut accessible. Une étude sur la combinaison possible de la chimie des carbènes de Fischer avec celle des carbè

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3

Le, Poul Pascal. "Sels de pyrylium et carbenes de fischer action des carbanions des carbenes de fischer sur des sels de pyrylium. Synthese de benzophenones hautement substituees et de carbenes de fischer insatures de type donneur - accepteur, directement ou non directement stabilises par un heteroatome." Rennes 1, 1999. http://www.theses.fr/1999REN10111.

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Les sels de pyrylium sont des heterocycles aromatiques oxygenes presentant un caractere de carbocation. Cette propriete est a l'origine de leur utilisation comme synthon pour la synthese de produits naturels et ils ont joue un role clef dans le developpement de la chimie heterocyclique. Par contre, la chimie organometallique des metaux de transition de ces sels a ete tres peu etudiee. Pour contribuer au developpement de cette chimie, nous avons teste la reactivite du noyau pyrylium avec des carbanions des carbenes de fischer. Dans ce memoire, nous presentons la reactivite des carbanions des ca

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4

Du, Toit Aletta. "Anioniese Fischer-tipe karbeenkomplekse as ligande." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53280.

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5

Stander, Elzet. "Nuwe reaksies van gedeprotoneerde Fischer-tipe karbeenkomplekse." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1222.

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6

Baba, Eduard. "N-Heterocyclic Carbenes of the Late Transition Metals: A Computational and Structural Database Study." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc4792/.

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A computational chemistry analysis combined with a crystallographic database study of the bonding in late transition metal N-heterocyclic carbene (NHC) complexes is reported. The results illustrate a metal-carbon bond for these complexes, approximately 4% shorter than that of a M-C single bond found in metal alkyl complexes. As a consequence of this result, two hypotheses are investigated. The first hypothesis explores the possibility of multiple-bond character in the metal-carbon linkage of the NHC complex, and the second, considers the change in the hybridization of the carbenoid carbon to

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7

Meyer, Annalene. "The synthesis of α-alkoxy and α-aminostannanes as precursors to Novel Chromium Fischer Carbenes". Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005036.

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The present study involves the use of main group organometallics: organostannanes and organolithiums as precursors to chromium Fischer carbene complexes. Fischer carbenes are well stabilized by the π‐donor substituents such as alkoxy and amino groups and low oxidation state metals such as Group 6 (Chromium, Molybdenum or Tungsten). Carbenes are an important intermediate in the synthesis of a range of compounds through cyclopropanations, insertions, coupling and photochemical reactions. Synthesis and successful characterisation of three α‐alkoxystannanes was achieved via nucleophilic addition o

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8

Makanjee, Che Azad. "An experimental and theoretical investigation of unstable Fischer chromium carbene complexes." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002953.

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This organometallic study involves the use organostannanes and organolithiums as precursors to chromium Fischer carbene complexes. Fischer carbenes are typically electrophilic and are stabilized by a single π-donor substituent, and contain low oxidation state metals (often but not always from Group 6). They are highly reactive and can give access to a range of biologically active compounds through cyclopropanations, insertions, coupling and photochemical reactions. Synthesis and characterization of three MOM-protected α-alkoxy organostannanes was successfully carried out via a nucleophilic add

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9

Jiménez, Halla José Óscar Carlos. "Theoretical study of catalytic reactions of carbenes: haptotropic rearrangements and the Dötz reaction." Doctoral thesis, Universitat de Girona, 2009. http://hdl.handle.net/10803/7942.

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En aquesta tesi s'han estudiat mecanismes de reaccions de cicloanulació en carbens de Fischer a través de mètodes teòrics, concretament fent servir el nivell de teoria B3LYP/(Wachters' basis / 6-31G**). Els alcoxi- i amino carbens de pentacarbonil crom, ja siguin vinílics o aromàtics, reaccionen amb acetilè per produir fenols, naftols o derivats ciclopentadiè o indè substituïts amb el Cr(CO)3 coordinat, d'una manera regioselectiva. L'objectiu d'aquest treball és discutir ambudes reaccions competitives particularment a la reacció de Dötz, la qual durant els darrers anys ha estat explorada exper

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10

Stander-Grobler, Elzet. "Carbene ligand and complex design directed towards application in synthesis and homogeneous catalysis." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1139.

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Thesis (PhD (Chemistry and Polymer Science))--Stellenbosch University, 2008.<br>Alkylated acetonitrile that forms during the synthesis of the sulfonium salt, [(Me3)2(MeS)S][BF4], is involved in the formation of new , -unsaturated Fischer-type carbene complexes from (CO)5M=C(OMe)CH2Li (M = Cr, W). Metal migration observed when the substitution product obtained from the reaction of the anionic carbene complexes (CO)5M=C(NMe2)CºC¯ (M = Cr, W) with Ph3PAu+ was left in solution, was also kinetically and theoretically investigated. 1H NMR and quantum mechanical (at the B3LYP level of theory) d

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11

Esterhuysen, Matthias Wilhelm. "Reactions of gold(I) electrophiles with nucleophiles derived from group 6 Fischer-type carbene complexes." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16046.

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Dissertation (PhD)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: This study comprises the preparation and characterisation of various novel organometallic species of gold(I) by employing a range of anionic group 6 metal Fischer-type carbene complexes and group 6 metal-acyl complexes as synthons of the organic moieties introduced to the gold(I) electrophiles. The main objectives of this work are to develop the use of Fischer-type carbene complexes as synthons in the preparation of novel organometallic species along unusual reaction pathways and, in doing so, to expand the organo

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12

Jandl, Christian [Verfasser], Roland A. [Akademischer Betreuer] Fischer, Ullrich [Gutachter] Englert, Polly L. [Gutachter] Arnold, and Roland A. [Gutachter] Fischer. "Carbocyclic Carbenes and Beyond: Functionalised Cycloheptatriene Systems as Versatile Ligands in Palladium Chemistry / Christian Jandl ; Gutachter: Ullrich Englert, Polly L. Arnold, Roland A. Fischer ; Betreuer: Roland A. Fischer." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1153545837/34.

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13

Jandl, Christian Verfasser], Roland A. [Akademischer Betreuer] [Fischer, Ullrich [Gutachter] Englert, Polly L. [Gutachter] Arnold, and Roland A. [Gutachter] Fischer. "Carbocyclic Carbenes and Beyond: Functionalised Cycloheptatriene Systems as Versatile Ligands in Palladium Chemistry / Christian Jandl ; Gutachter: Ullrich Englert, Polly L. Arnold, Roland A. Fischer ; Betreuer: Roland A. Fischer." München : Universitätsbibliothek der TU München, 2018. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20180215-1398715-1-5.

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14

Crause, Chantelle. "Synthesis and application of carbene complexes with heteroaromatic substituents /." Access to E-Thesis, 2004. http://upetd.up.ac.za/thesis/available/etd-05252005-145146/.

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15

Harris, Nora-ann. "Piggybacking Fischer carbene complexes." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33178.

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16

Levell, Tamzyn J. "Substituted Fischer carbene complexes of molybdenum(0)." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46250.

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The synthesis and structure elucidation of fourteen novel Fischer ethoxy- and amino carbene complexes of molybdenum and chromium metals of the type [(CO)3L2M=C(X)R] were performed. Substitution of the parent pentacarbonyl complex [(CO)5M-C(OEt)(R)]; M = Mo, Cr; R = 2-thienyl, 2-furyl; with mono- and bidentate phosphine ligands yielded the corresponding tetracarbonyl complexes [(CO)4(PR’3)M-C(OEt)R] with M = Mo, Cr, R = 2-thienyl, 2-furyl and R’ = Ph, Cy or tricarbonyl complexes [(CO)3(DPPE)Mo-C(OEt)(2-furyl)], respectively. Aminolysis of these novel complexes resulted in substitution of

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17

Fraser, Roan. "Fischer and N-heterocyclic carbene complexes of chromium(0)." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31504.

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The central focus of this study was the synthesis, structural investigation and characterisation of multiple chromium carbene complexes. Fifteen novel chromium(0) complexes were synthesised. The synthesis of the primary monocarbene starting material [Cr(CO)5{C(OEt)(heteroaryl)}], heteroaryl = thiophene, furan, 2,2’-bithiophene, was carried out utilising typical Fischer methodology. A wide variation of spacer ligands were reacted to obtain different carbene substituents. The ligand substitution reaction between carbonyl ligands and the bidentate ligands followed the techniques proposed in liter

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18

Pretorius, René. "Fischer and N-heterocyclic carbene complexes of tungsten(0)." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31515.

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The synthesis of novel Fischer and N-heterocyclic tungsten(0) carbene complexes was endeavoured in this study and resulted in the synthesis, isolation and characterisation of eighteen new complexes. Sixteen novel Fischer carbene complexes were synthesised. In these complexes, both carbene ligand substituents were varied. Ethoxy as well as amino heteroatom substituents were used. Heteroaryl compounds thiophene and furan were employed as the second substituents on the carbene ligand. Complexes with combinations of these different substituents were synthesised and investigated to assess the infl

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19

Van, der Westhuizen Belinda. "Heteroaryl carbene complexes : synthesis, reactivity and redox behaviour." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40242.

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A series of Fischer mono- and biscarbene complexes of the type [MLn{C=(XR)R'}] was synthesized and characterized. The redox behavior of the complexes was studied by different techniques, including cyclic voltammetry, spectroelectrochemistry, ESR and computational methods. Different transition metals (M) and carbene substituents (XR, R') were employed to compare both the effect of the central metal atom as well as the carbene substituent. Thienyl, furyl and ferrocenyl chromium(0) mono- and biscarbene complexes with ethoxy and amino substituents were electrochemically studied in CH2Cl2. Re

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20

Altmann, Philipp Johannes [Verfasser], Roland A. [Akademischer Betreuer] Fischer, Jason [Gutachter] Love, János [Gutachter] Mink, and Roland A. [Gutachter] Fischer. "Supramolecular Organometallics : Carbene Chemistry beyond the Molecule / Philipp Johannes Altmann ; Gutachter: Jason Love, János Mink, Roland A. Fischer ; Betreuer: Roland A. Fischer." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1153122502/34.

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21

Altmann, Philipp Johannes Verfasser], Roland A. [Akademischer Betreuer] [Fischer, Jason [Gutachter] Love, János [Gutachter] Mink, and Roland A. [Gutachter] Fischer. "Supramolecular Organometallics : Carbene Chemistry beyond the Molecule / Philipp Johannes Altmann ; Gutachter: Jason Love, János Mink, Roland A. Fischer ; Betreuer: Roland A. Fischer." München : Universitätsbibliothek der TU München, 2018. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20180212-1403311-1-5.

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22

Sigano, Dina Marie. "Fischer carbene complex mediated synthesis of cyclopropylpyrrolidines : an approach to (+)-CC-1065 and the duocarmycins /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9804037.

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23

Tumay, Tulay Asli. "Synthesis Of Ferrocenyl Cyclopentenones." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606372/index.pdf.

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ABSTRACT SYNTHESIS OF FERROCENYL CYCLOPENTENONES TUMAY, T&uuml<br>lay Asli M.S., Department of Chemistry Supervisor: Assoc. Prof. Dr. Metin Zora August 2005, 80 pages Construction of highly functionalized five-membered rings via cycloaddition reaction of cyclopropylcarbene-chromium complex with alkynes has become a very active area of research in recent years by virtue of their presence in antitumour natural products. Also with the finding that ferrocene derivatives are active against various tumours, considerable interest has been devoted to the synthesis of new ferrocene derivatives

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24

Bertolini, Thomas Michael Bertolini Thomas Michael. "I, Rapid access to [4.3.1]propellanes via Fischer carbene complexes ; II, Protein kinase C-[beta]II binding by modified phorbol esters with functionalized lipophilic regions /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3022233.

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25

Frutos, Höner Annabelle P. "Methodology studies on in situ generated Fischer carbene complexes of group VI transition metals, on the chromium-Reformatsky reaction of nitrogen based compounds, and analytical studies of the Vogel collection /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9956454.

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26

Lindhorst, Anja Cosima [Verfasser], Fritz E. [Akademischer Betreuer] [Gutachter] Kühn, Werner [Gutachter] Bonrath, and Richard W. [Gutachter] Fischer. "Towards Real-Life Applications: Reactivity of Biomimetic Iron N-Heterocyclic Carbene Complexes in Homogeneous Catalysis / Anja Cosima Lindhorst ; Gutachter: Werner Bonrath, Fritz E. Kühn, Richard W. Fischer ; Betreuer: Fritz E. Kühn." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1138787914/34.

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27

Haslinger, Stefan [Verfasser], Fritz Elmar [Akademischer Betreuer] Kühn, Ulrich K. [Akademischer Betreuer] Heiz, Richard W. [Akademischer Betreuer] Fischer, and Jean-Marie [Akademischer Betreuer] Basset. "Bioinspired Iron N-Heterocyclic Carbene Complexes in C–H Bond Oxidation: Reactivity, Electronic Properties, and Catalytic Activity / Stefan Haslinger. Betreuer: Fritz Elmar Kühn. Gutachter: Ulrich K. Heiz ; Richard W. Fischer ; Fritz Elmar Kühn ; Jean-Marie Basset." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1080299270/34.

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28

Germaneau, Romain [Verfasser]. "Amphiphilic sugar metal carbenes: from Fischer type to N-Heterocyclic Carbenes (NHCs) : investigations on potential gelation and catalytic activities / vorgelegt von Romain Germaneau." 2007. http://d-nb.info/986430870/34.

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29

Fuertes, Michael Joseph. "Synthetic studies towards taxol : the reaction between Fischer carbene complexes and chiral dienynes /." 2002. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3039028.

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30

Liptak, Vincent Paul. "Investigation of the chemoselectivity and efficiency of the benzannulation reaction of electron poor aryl Fischer carbene complexes : synthetic studies toward (+)-olivn /." 2000. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:9978043.

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31

LIU, HUI-JIN, and 劉慧瑾. "Deformation electron density study of fischer carbene complex." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/82647982766643257763.

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碩士<br>國立臺灣大學<br>化學研究所<br>79<br>Fischer carbene complex 自從1964年被E.O.Fischer 合成後，在有機合成上一直是一個很有用的試劑。傳統上認為金屬及碳原子的極化是M = C ，碳原子為neucleop hilic attack site 。此篇論文是為了探討金屬與亞碳基間的鍵結，分子間各原子所帶的凈電荷，以及在加成反應時，兩反應物間分子軌域(HOMO, LUMO)能量的關係。在此以一鉻的Fischer carbene complex [(CO) CrC(OCH ) CCC H (methoxy-2-pheny lethynyl-methylenepentacarbonyl chromium)]的單晶，藉著X-ray 繞射的方法，分別在106K及300K收集繞射數據。此化合物的空間群為P2 /n ，屬於單斜晶系。在106K 的晶格參數(cell parameter)為a=11.383(1), b=11.506(1)及c=11.739(1) , β=108 .377(9)°,

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32

Ramollo, Granny Kabelo. "Synthesis and application of rhodium(I) Fischer carbene complexes." Diss., 2016. http://hdl.handle.net/2263/57285.

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In this study, novel rhodium(I) carbene complexes were synthesized and fully characterized via a carbene ligand transfer methodology from Group 6 Fischer carbene complex precursors and subsequent ligand modification. The classic Fischer route was followed towards the isolation of mono- and biscarbene complexes of the form [M(CO)5{C(OR)R'}] [M = Cr, W; R = Me, Et; R' = 2-furyl, 2-thienyl, ferrocenyl] (complexes 1 6, 9 and 10), and [M(CO)5?{C(OR)-R''-C(OR)}M(CO)5] [M = Cr; R = Me, Et; R'' = 2,2'-bithien-5,5'-diyl, 2,5-furadiyl, 1,1'-ferrocendiyl] (complexes 7, 8 and 11), respectively. Analogou

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33

Van, der Walt Elisia. "The Synthesis of Fischer carbene complexes with metal-containing substituents." Diss., 2006. http://hdl.handle.net/2263/30553.

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34

Zoloff, Michoff Martin Eduardo. "Síntesis y reactividad de complejos carbeno de Fischer." Doctoral thesis, 2007. http://hdl.handle.net/11086/14579.

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35

"Synthesis of polysubstituted-1, 4-quinones and allylsilanes via alkenyl Fischer carbene complexes." Chinese University of Hong Kong, 1993. http://library.cuhk.edu.hk/record=b5887814.

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by Chi-Ching Mak.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1993.<br>Includes bibliographical references (leaves 65-70).<br>Acknowledgement --- p.i<br>Abbreviation --- p.ii<br>List of spectra --- p.iii<br>Contents --- p.iv<br>Abstract --- p.v<br>Chapter Part One: --- "Synthesis of Poly substituted-1,4-Quinones"<br>Chapter 1.1 --- Introduction<br>Chapter 1.2 --- Results and discussion --- p.9-16<br>Chapter 1.3 --- Conclusion --- p.17<br>Chapter Part Two: --- Synthesis of Allylsilanes<br>Chapter 2.1 --- Introduction --- p.18-25<br>Chapter 2.2 --- Results and discussion --- p

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36

"Kinetic studies of [3+2] cycloaddition of Fischer carbene complexes with nitrones." Chinese University of Hong Kong, 1994. http://library.cuhk.edu.hk/record=b5887287.

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by Ming Lok Yeung.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1994.<br>Includes bibliographical references (leaves 54-56).<br>ACKNOWLEDGMENT --- p.i<br>ABBREVIATION --- p.ii<br>ABSTRACT --- p.iii<br>CONTENTS --- p.iv<br>Chapter I. --- INTRODUCTION --- p.1<br>Chapter II. --- RESULTS AND DISCUSSION --- p.8<br>Chapter II-1 --- [3+2] CYCLOADDITION OF FISCHER CARBENE COMPLEXES WITH NITRONES --- p.8<br>Chapter II-2 --- KINETIC STUDIES OF THE [3+2] CYCLO ADDITION --- p.18<br>Chapter III. --- CONCLUSION --- p.35<br>Chapter IV. --- EXPERIMENTAL --- p.36<br>Chapter V. --- APPENDIX -

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37

Bertolino, María Candelaria. "Modificación de superficies de vidrio y nanoparticulas de sílica con complejos carbenos de Fischer : aplicaciones en nanociencia." Doctoral thesis, 2017. http://hdl.handle.net/11086/15594.

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Tesis (Doctora en Ciencias Químicas) - - Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, 2017<br>En línea con los dicho anteriormente se hará un resumen de la tesis empezando por los objetivos y luego una valoración del trabajo realizado en esta tesis doctoral. El objetivo primero fue modicar supercies para hacerlas reactivas frente a complejos carbenos de Fischer. Las reacciones especicas, involucran organosilanos de cadena carbonadas largas que reaccionan por el resto silano con la supercie de un vidrio (soporte elegido), previamente activado, para que dejen grupos funci

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38

Wu, Yao-Ting. "β-Aminosubstituted α,β-Unsaturated Fischer Carbene Complexes as Precursors for Complex Oligocyclic Molecules - Basics and Applications". Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B61B-7.

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39

Milic, Jelena. "Sesquiterpen-Analoga aus b-Dimethyamino-substituierten a,b-ungasättigten Fischer-Carbenkomplexen." Doctoral thesis, 2002. http://hdl.handle.net/11858/00-1735-0000-0006-B092-F.

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40

Wu, Yao-Ting [Verfasser]. "β-aminosubstituted [Beta-aminosubstituted] α,β-unsaturated [alpha, beta-unsaturated] Fischer carbene complexes as precursors for complex oligocyclic molecules : basics and applications / vorgelegt von Yao-Ting Wu". 2005. http://d-nb.info/974139009/34.

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