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Dissertations / Theses on the topic 'Heterocyclic Carbene'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Ellul, Charles. "Trimetallic N-heterocyclic carbene complexes." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538279.

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2

Hippolyte, Laura. "New syntheses of N-heterocyclic carbene-stabilized gold nanoparticles." Electronic Thesis or Diss., Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2018SORUS148.pdf.

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Récemment, les carbènes N-hétérocycliques (NHC) ont suscité un intérêt important dans le domaine de la chimie des matériaux. En effet, cette nouvelle catégorie de ligands forme des liaisons très fortes avec une diversité de métaux et leur structure, ainsi que leurs propriétés électroniques, peuvent être adaptées par de la synthèse organique. Cette forte liaison est d’un intérêt particulier dans le domaine des nanoparticules d’or (NP) et des synthèses ont déjà été proposées. En effet, les NPs présentent de nombreuses applications potentielles, par exemple dans les capteurs, en catalyse ou médec

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3

Casely, Ian J. "Electropositive metal N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3873.

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The first chapter is an introduction to the f-elements, with a focus on the synthesis and chemistry of tetravalent cerium complexes. The synthesis, characterisation and reactivity of carbenes, particularly N-heterocyclic carbenes (NHCs), and anionic-functionalised NHC ligands is discussed. The synthesis and reactivity of s-block, Group three and fblock NHC complexes is reviewed. The synthesis of the alcohol-functionalised unsaturated imidazolium proligand, [H2L]I [H2L = HOCMe2CH2(1-CH{NCHCHNiPr})], is extended to saturated imidazolinium analogues, [H2LR]X, [HOCMe2CH2(1-CH{NCH2CH2NR})]X (R = iP

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4

Rodden, Mark. "Alkoxide functionalised N-heterocyclic carbene complexes." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423306.

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5

Williamson, Craig. "Imidazolylidenes in N-heterocyclic carbene organo-catalysis." Thesis, University of Aberdeen, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440601.

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A library of chiral and achiral imidazolium salts was prepared, and evaluated as potential pre-catalysts of the benzoin condensation. It was found that although the carbenes derived from these compounds possess catalytic activity, this was not as pronounced as that observed for alternative heterocycle classes. Asymmetric induction, although observed from imidazolylidenes for the first time in this work, is not of an order that could be considered useful, as has been seen for other NHC catalysts. This is attributed to the use of harsh reaction conditions, required to promote catalytic activi

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6

Tulloch, Arran Alexander Dickon. "Novel mixed donor N-Heterocyclic carbene complexes." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249941.

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7

Bemowski, Ross David. "Novel N-heterocyclic dicarbene ligands and molybdenum and dimolybdenum N-heterocyclic carbene complexes." Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/1291.

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The syntheses of a new class of polycyclic TriAmino DiCarbenes (TADCs), based on 3,9-diazajulolidine, and their precursors and adducts are described. Starting with 2,6-dimethyl-nitrobenzene, 2,6-bis ((alkylamino)methyl)anilines (alkyl = isopropyl, mesityl, and tert-butyl) were synthesized in 40% yield over five steps. These triamines were then di-cyclized stepwise to diformamidinium dications or formamidinium/2-methoxyformaminals using oxonium salts and trialkyl orthoformates. A diformamidinium dication was characterized by single-crystal X-ray diffractometry. Treatment with various bases, par

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8

Zhang, Pinglu. "Cyclodextrin-(N-Heterocyclic Carbene)-Metal Complexes for Cavity-Dependent Catalysis." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066380/document.

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Des complexes de Cyclodextrine (CD)-NHC-Métaux (NHC= Carbènes N-Hétérocycliques), comprenant des métaux tel que AgI, CuI et AuI ont été synthétisés. Une étude structurale a mis en évidence la position intra-cavitaire du métal, induisant des interactions C-H…M, C-H…X et π…X. L’influence du type de cavité (α-, β-, γ-CD) et du type de dérivés NHC (Imidazole, benzimidazole, triazole) a été étudiée. Les interactions diminuent avec l’augmentation de la taille de la cavité et en parallèle, celles-ci ont été amplifiées avec des dérivés NHC possédant un effet donneur plus fort. Les complexes de cuivre

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9

Ling, Xiang. "N-heterocyclic carbenes coated nanocrystals and supracrystals." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066334/document.

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Les nanomatériaux ont beaucoup captivé l'attention pour leur propriétés uniques, fortement associées à leurs dimensions nanoscopiques. En particulier, les nanoparticules (NP) à base de métaux nobles (Au, Ag) présentent des propriétés mécaniques, électroniques, optiques et magnétiques particulières intéressantes pour le développement d'applications dans de nombreux domaines à fort impact sociétal. En raison de leur stabilité élevée par rapport aux autres nano- particules métalliques, les nanoparticules d'or ont été abondamment explorées pour les nanotechnologies. Ces dernières décennies, les NH

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10

Maluenda, Borderas Irene. "(N-heterocyclic carbene) : metal catalysed carbon-carbon and carbon-heteroatom bond-forming reactions." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/76274/.

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11

Sirokman, Gergely. "(N-heterocyclic-carbene)Copper(I)-catalyzed carbon-carbon bond formation using carbon dioxide." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39584.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2007.<br>Vita.<br>Includes bibliographical references.<br>This thesis presents work towards the development of a new catalytic C-C bond forming reaction. Alkynes and olefins insert into [(IPr)CuH]2 (IPr = N,N-bis-(2,6-diisopropylphenyl)-1,3-imidazol-2-ylidene) to give copper vinyl and copper alkyl complexes. These copper complexes insert CO2 into the Cu-C bond to form copper acrylate and copper carboxylate complexes. Acrylic and carboxylic acids can be isolated by hydrolysis. A catalytic cycle based on (IPr)copper(I) w

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12

Reddy, Y. S. V. "Enantioselective construction of six - membered heterocycles and carbocycles using N - heterocyclic carbene (NHC) - organocatalysis." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2016. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2079.

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13

Collinson, John Michael. "Immobilised N-heterocyclic carbene metal complexes in catalysis." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/42227.

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Transition metal-based catalysts are one of the most powerful tools available to chemists and the development of ligand systems with which to modify their activity is a constant area of research. In the last twenty years N-Heterocyclic carbenes (NHCs) have established themselves at the forefront of organometallic chemistry. To increase the lifetime of the catalyst these ligands are increasingly being immobilised on supports as, this allows recovery and reuse while attempting to retain the activity. Cleaner, greener and safer processes are increasingly important and the recovery of the catalyst

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14

Bourghida, Ahmed. "Heterocyclic ring synthesis using alkylidene carbene insertion reactions." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247946.

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15

Chardon, Edith. "N-Heterocyclic carbene complexes : toward innovative anticancer agents." Strasbourg, 2011. http://www.theses.fr/2011STRA6265.

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Parmi les agents thérapeutiques utilisés en chimiothérapie, la molécule la plus connue et utilisée dans le monde est le cisplatine ou cis-diamminedichloroplatinum(II) démontrant le potentiel des métaux en chimie médicinale. Malheureusement, le cisplatine engendre de nombreux effets secondaires importants et une résistance cellulaire. Dans la quête de nouveaux agents anticancéreux, les complexes de carbènes N-hétérocycliques (NHC) de métaux de transition constituent des candidats prometteurs. C’est dans ce contexte que s’est inscrit l’objet du projet de thèse qui a consisté en la synthèse et l’

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16

Robinson, William J. III. "Development of Tetrathiafulvalene Fused N-Heterocyclic Carbene Compounds." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1610382201476554.

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17

Serre, Veronique. "Synthesis of new N-heterocyclic carbene metal complexes." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/34833.

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This thesis describes the synthesis of new N-heterocyclic carbene complexes through the synthesis of 1,4-bis-substituted imidazolium salts or tricyclic saturated imidazolium salts. The introduction highlights some of the most successful methods for preparing N-heterocyclic carbenes and corresponding metal complexes. Examples of the use of these complexes in transition metal-catalysed processes are provided towards the end of this chapter. The second chapter is dedicated to our efforts to synthesize 1,4-bis-substituted imidazolium salts as precursors for the synthesis of N-heterocyclic carbene

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18

Hodgson, Richard. "Novel chiral di-N-heterocyclic carbene and hybrid phosphine-N-heterocyclic carbene ligands and their application to transition metal mediated asymmetric catalysis." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423839.

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19

Martínez, Lombardía Alberto. "Heterogenized n-heterocyclic carbene metal complexes for selective catalysis." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/386577.

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La present tesi doctoral està adreçada al desenvolupament de catalitzadors que permetin dur a terme processos sintètics de manera més eficient i sostenible. Es presenten dues noves famílies de catalitzadors suportats, ambdues pertanyents al grup de complexos organometàl·lics moleculars immobilitzats sobre un suport sòlid. La primera família inclou complexos de Pd amb lligands carbè N-heterocíclic monodentats de gran impediment estèric, immobilitzats sobre òxids inorgànics, com ara sílicas, alúmina o òxid de titani. Aquesta família de catalitzadors es va aplicar en dos tipus de reaccions: i) re

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20

Charra, Valentine. "Coordination of multidentate N-heterocyclic carbene ligands to nickel." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF019/document.

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Le sujet de cette thèse porte sur la synthèse de ligands de type bis-NHC (carbène N-Hétérocyclique) et leur réactivité vis-À-Vis des complexes d’argent(I), de cuivre(I) et de nickel(II).Après avoir exploré les différentes méthodologies de synthèse des complexes de nickel(II) bis-NHC, le but était de tester leurs activités en catalyse d’oligomérisation de l’éthylène. Une série de nouveaux complexes d’argent(I) et de cuivre(I) fut synthétisée. Cinq voies furent testées pour la formation de complexes de nickel. Les résultats les plus probants furent obtenus par transmétallation à partir des compl

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21

Arentsen, Katherine. "Application of palladium N-heterocyclic carbene complexes in catalysis." Thesis, University of Sussex, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430951.

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22

Newman, Christopher P. "Phenylpyridine and N-heterocyclic carbene complexes of platinum (II)." Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425555.

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23

Martin, Thomas Antony. "Unravelling the photochemistry of organometallic N-heterocyclic carbene complexes." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547630.

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This thesis describes the synthesis, characterisation and reactivity of new manganese and rhenium(I) NHC complexes, which have been investigated both thermally and photochemically and the results contrasted with existing phosphine analogues in the literature. Cp’Mn(CO)2(NHC) (NHC = IEt2Me2 1, IMes 2, IiPr2Me2 3 and IPr 4) were synthesised and investigated by TRIR spectroscopy. Loss of CO was observed after 355 nm irradiation to form agostically stabilised intermediates, which reformed the parent species by recombination with CO on the nanosecond timescale. Loss of NHC was not observed, in cont

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24

Marr, Isobel Helen. "Synthesis and reactivity of scandium N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17970.

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Chapter one introduces N-heterocyclic carbenes (NHCs) and discusses their use as ligands for rare earth metal complexes, with particular emphasis upon compounds synthesised from 2009 until the present day. Chapter two details the synthesis and characterisation of the homoleptic scandium-NHC complex [Sc(L)3] (L = [OCMe2CH2(1-C{NCHCHNiPr})]). Reactions of [Sc(L)3] with boranes, CO2 and CS2 are described which exploit the relative lability of the Sc–Ccarbene bond and allow formation of [Sc(L)2(OCMe2CH2(1-B'C{NCHCHNiPr}))] (B' = 9-BBN, BPh3, B(C6F5)3, BH3), [Sc(OCMe2CH2(1-O2CC{NCHCHNiPr})3]n, [Sc(

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25

Durmus, Semih. "Silver(I) and Gold(I) N-Heterocyclic Carbene Complexes." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1165247084.

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26

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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27

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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28

Sprick, Reiner Sebastian. "Polytriarylamines containing fused ring and heterocyclic structures prepared using N-heterocyclic carbene complexes of palladium." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/polytriarylamines-containing-fused-ring-and-heterocyclic-structures-prepared-using-nheterocyclic-carbene-complexes-of-palladium(c09188eb-490b-452c-945a-22979f58c76d).html.

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For the preparation of semiconducting polymers often ‘standard’ catalytic systems are used without further optimisation. New ligands, such as N-heterocyclic carbenes have shown excellent activity in cross-coupling reactions (e.g. Suzuki-Miyaura reaction, or Hartwig-Buchwald amination). These systems show excellent conversions under mild conditions and even allow the use of aryl chlorides as reagents. Nevertheless, previously no system has been reported for the synthesis of conjugated polymers, e.g. the Suzuki polycondensation or Buchwald-Hartwig type polycondensation using these catalysts. A N

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29

Wang, Yinli. "Development of A New Heterocycle Forming Reaction and Kinetic Resolution with N-Heterocyclic Carbenes." Kyoto University, 2018. http://hdl.handle.net/2433/232320.

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30

Panzner, Matthew John. "SILVER N-HETEROCYCLIC CARBENES AND SUBSTITUTED CYCLOTRIPHOSPHAZENES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164744266.

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31

Germeroth, Anne Inger. "Reactivity of electropositive f-block metal N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/9519.

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The combination of Lewis acidic f-block metals and a labile nucleophilic carbene can be an excellent means to activate small molecules such as silanes, CO2 and other traditionally inert substrates. Furthermore, bidentate alkoxy-NHC ligands have shown promise in the support of unusual high oxidation state organometallic complexes, including examples of CeIV, PdIV and UVI. In this thesis the synthesis and reactivity of a series of f-block metal NHC complexes is described. Chapter One introduces N-heterocyclic carbenes and their f-block metal complexes, in particular of cerium, praseodymium and u

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32

Fyfe, Andrew Alston. "d- and f-metal alkoxy-tethered N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/15862.

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Chapter one is an introduction, outlining the structure and bonding of N-heterocyclic carbenes (NHCs). It then goes on to give examples of f -metal NHC complexes and describes any reactivity or catalytic activity. Chapter two describes the synthesis of the transition metal NHC complexes [Fe (LMes)2] 3 and [Co(LMes)2] 4 (LMes = OCMe2 CH2(1-C{NCH2CH2NMes})). The heterobimetallic complexes [(LMes)Fe(μ-LMes)U(μ-{N(SiMe3)Si(Me)2CH2})(N(Si Me3)2)2] 5 and [(LMes)Co(μ-LMes)U(μ-{N(SiMe3)Si(Me)2CH2})(N(SiMe3)2)2] 6 were prepared from the reaction between [({Me3Si}2N)2U(NSiMe3SiMe2CH2)] and 3 or 4, respe

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33

Turner, Zoe Rose. "Small molecule activation using electropositive metal N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/8210.

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The versatility of N-heterocyclic carbenes (NHCs) is demonstrated by numerous practical applications in homogeneous transition metal catalysis, organocatalysis and materials science. There remains a paucity of electropositive metal NHC complexes and so this chemistry is poorly developed with respect to that of the late transition metal and main group elements. This thesis describes the synthesis of new alkoxy-tethered NHC proligands, their use in the synthesis of reactive metal amide and metal alkyl complexes, and finally small molecule activation using these complexes. Chapter One introduces

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34

Teasdale, Christopher William Thomas. "Novel N-heterocyclic carbene ligands for use in supported catalysis." Thesis, Durham University, 2005. http://etheses.dur.ac.uk/2953/.

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Ligands involving CNC structures have been of intense interest in research. With an aim to investigating this area, a modular synthesis was developed using condensation reactions between a base unit of 2,6-dichloroisonicotinic acid and N-alkyl imidazoles toprovide a range of 2,6-bis(imidazolium) salts. From this point several methods wereavailable to incorporate an active metal centre, however, state of the art microwaveaccelerated synthesis was found to be the most successful technique in forming the tridentate palladium complexes. Several strategies were investigated to attach these complexe

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35

Li, Kai, and 李凯. "Photoluminescent organoplatinum (II) complexes containing N-heterocyclic carbene (NHC) ligands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50533915.

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The syntheses, structures, photophysical properties and applications of three types of photoluminescent organoplatinum(II) complexes containing N-heterocyclic carbene (NHC) ligands are described. The tetradentate dianionic bis(phenolate-NHC) type ligands provide a superior scaffold for constructing thermally stable and efficient deep-blue phosphorescent Pt(II) complexes with λmax of ~440-460 nm and solid-state emission quantum yields of ~30%. Highly efficient blue OLEDs with CIEx, y of (0.19, 0.21) were fabricated based on these emitters with maximum brightness, peak current efficiency and

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36

Geraghty, Paul Bythell. "Studies towards the synthesis of fused N-Heterocyclic carbene precursors." Thesis, University of Canterbury. Chemistry, 2013. http://hdl.handle.net/10092/8197.

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This thesis describes the preparation of a various NHC ligands with five and six-membered rings, different fused aromatic cores and the subsequent synthetic development of their complexation of with Ag, Ru and Pd. The investigation and preparation of these compunds was with the intention of exploring their chemical and physical properties. The synthesis of the NHC ligands proved to be difficult, but analysis and characterisation of the side products from the reactions helped to establish successful synthetic methodologies. In both the five and six-membered research conducted a common attribute

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37

Rose, Marcus, Andreas Notzon, Maja Heitbaum, et al. "N-Heterocyclic carbene containing element organic frameworks as heterogeneous organocatalysts." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138636.

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A bifunctional imidazolium linker was used for the production of highly crosslinked element organic frameworks by Suzuki-coupling with tetrafunctional boronic acids. The resulting porous materials are good heterogeneous organocatalysts in the N-heterocyclic carbene-catalyzed conjugated umpolung of α,β-unsaturated cinnamaldehyde<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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38

Marshall, Colin. "The synthesis of chiral C2-symmetric N-heterocyclic carbene complexes." Thesis, University of Aberdeen, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248633.

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The quaternisation of 1-substituted-azoles with a, w-dihaloalkanes furnished the diazolium salts. Conversion of the salts by deprotonation in the presence of sulphur generated the corresponding dithiones. A series of propylene diimidazolium salts and thiones gave an insight into the ease of handling, hygroscopic nature and yields associated with these compound. Propylene bridged diimidazol-2-ylidenes and ethylene bridged imidazolidin-2-ylidenes were never isolated from deprotonation of the salts or reductive desulphurisation of the thiones. <i>In situ</i> reactions with the salts and palladium

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39

Davies, Caroline. "Trans-dihydride complexes of ruthenium bearing N-heterocyclic carbene ligands." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665402.

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Addition of 1,3,4,5 tetramethylimidazol 2 ylidene (IMe4) to Ru(PPh3)3HCl (in the presence of H2) or Ru(PPh3)4H2 gave the all trans isomer of Ru(IMe4)2(PPh3)2H2, whereas 1,3 diethyl 4,5 dimethylimidazol 2 ylidene (IEt2Me2) reacted with Ru(PPh3)4H2 to form cis, cis, trans Ru(IEt2Me2)2(PPh3)2H2. The previously reported trans dihydride complex, Ru(IMe4)4H2, was synthesized by a new method involving the reduction of Ru(IMe4)4Cl2 with KC8/H2. CO reacted with Ru(IMe4)2(PPh3)2H2 to give a mixture of Ru(IMe4)2(PPh3)(CO)H2, Ru(IMe4)(PPh3)2(CO)H2 and Ru(IMe4)2(CO)3; Ru(IEt2Me2)2(PPh3)2H2 reacted in a sim

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40

Daly, Christopher Gary. "Applications of amido-N-heterocyclic carbene ligands in bifunctional catalysis." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/27800.

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This thesis describes the synthesis of amino/amido-N-heterocyclic carbene (NHC) complexes of late transition metals, in order to investigate bifunctional catalysis involving a metal-amido bond. Chapter one introduces bifunctional catalysis, with an emphasis on the mechanism of bifunctional bond-breaking during catalytic reactions. Mechanisms of C-H activation are described and the features of bifunctional C-H activation (AMLA) discussed. The ligand properties, and methods of synthesis, of NHC and amido ligands are described, and the choice of ligand to investigate bifunctional catalysis ration

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41

Diebolt, Olivier. "N-heterocyclic carbene ligands in palladium and iridium organometallic chemistry." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/2126.

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The use of ligand in transition-metal catalysed reactions has had a considerable impact. The present manuscript aims at showing the influence of ligands in the palladium catalysed Suzuki-Miyaura cross-coupling reaction. In chapter one, the mechanism of this reaction will be described based on the numerous contribution published in the literature. It will be shown that the electronic and steric properties of the ligands have a huge repercussion on the catalytic activity of the metal. In the second chapter, the electronic and steric properties of the widely used Buchwald-phosphine ligand will be

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Titcomb, Lisa Rae. "Novel palladium N-heterocyclic carbene complexes as catalysts for aminations." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395012.

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The work described in this thesis is primarily focused on the synthesis and characterisation of two-coordinate zerovalent palladium complexes bearing an N-heterocyclic carbene ligand. These complexes have been assessed as pre-catalysts for coupling reactions in particular ami nation reactions involving the generation of a C-N bond. Chapter 1 presents the synthesis of complexes r, r bearing the ligand [CNCBu)(CH)2NCBu)]. An alternative synthesis for [Pd{CNCBu)(CH)2NCBu)h] 1 is reported involving reaction of [{Pd(T)3-C4H7)Clhl with sodium dimethyl malonate and carbene. Reaction of 1 with iodoben

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Dupuy, Stéphanie. "N-heterocyclic carbene gold hydroxide complexes as bond activation reagents." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/6613.

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Although known since the 1930s, organogold chemistry has been dormant until recently, primarily due to preconceptions about the inertness of gold in transformations. However, this last decade has witnessed the emergence of a Golden Age with the development of a wealth of reports on gold in a plethora of reactions. In recent years, the drive for more atom- and step-economical and environmentally friendly reactions has become a field of intense research. In our on-going research on well-defined transition metal complexes bearing NHC ligands, our group recently discovered a new gold(I) hydroxide

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Rose, Marcus, Andreas Notzon, Maja Heitbaum, et al. "N-Heterocyclic carbene containing element organic frameworks as heterogeneous organocatalysts." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27766.

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A bifunctional imidazolium linker was used for the production of highly crosslinked element organic frameworks by Suzuki-coupling with tetrafunctional boronic acids. The resulting porous materials are good heterogeneous organocatalysts in the N-heterocyclic carbene-catalyzed conjugated umpolung of α,β-unsaturated cinnamaldehyde.<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

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Tomar, Pooja. "N-heterocyclic carbene derivatives for the activation of sulfur fluorides." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22932.

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Die metallfreie Aktivierung des Treibhasgases SF6 unter Verwendung von elektronenreichen N-heterocyclischen Carbenen (NHCs) resultierte in der Bildung des jeweiligen 2,2- Difluorimidazolins und Imidazolin-2-thions bzw. 2,2-Difluorimidazolidins und Imidazolidin-2-thions. Die Reduktion der NHCs mit SF4 liefert dieselben Produkte. Im Abbau von SF5CF3 mit NHCs werden ebenfalls die zuvor genannten Produkte erhalten, wobei zusätzlich das entsprechende 2-Fluor-2-trifluormethylderivat gebildet wird. Exemplarisch wurde 1,3-Dimesityl-2,2-difluorimidazolidin [SIMes(F)2] als Fluorierungsreagenz von Aldeh

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Truscott, Byron John. "N-heterocyclic carbene rhodium(I) and iridium(I) hydroxide complexes." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/7049.

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The unique reactivity that hard/soft-acid/base mismatched metal hydroxide complexes are capable of makes this elusive class of highly reactive organometallic complexes very interesting. The stabilisation of rhodium and iridium hydroxide bonds using electron rich N-heterocyclic carbene (NHC) ligands has enabled us to examine their rich chemistry and proved to be very rewarding. A general method was established for the preparation of a family of Rh(I)-NHC hydroxide complexes (four members), which proved to be highly active promoters of the conjugate addition of arylboronic acids to α,β-unsaturat

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Paine, Belinda Marie. "Ruthenium N-heterocyclic carbene complexes : C-H activation and catalysis." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425799.

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Solinas, Gavino <1984&gt. "N-Heterocyclic carbene complexes of rhodium: structures, dynamics and catalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5637/1/solinas_gavino_tesi.pdf.

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A series of imidazolium salts of the type [BocNHCH2CH2ImR]X (Boc = t-Bu carbamates; Im = imidazole) (R = Me, X = I, 1a; R = Bn, X = Br, 1b; R = Trityl, X = Cl, 1c) and [BnImR’]X (R’ = Me, X = Br, 1d; R’ = Bn, X = Br, 1e; R’ = Trityl, X = Cl, 1g; R’ = tBu, X = Br, 1h) bearing increasingly bulky substituents were synthetized and characterized. Subsequently, these precursors were employed in the synthesis of silver(I)-N-heterocyclic (NHC) complexes as transmetallating reagents for the preparation of rhodium(I) complexes [RhX(NBD)(NHC)] (NHC = 1-(2-NHBoc-ethyl)-3-R-imidazolin-2-ylidene; X = Cl;

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49

Solinas, Gavino <1984&gt. "N-Heterocyclic carbene complexes of rhodium: structures, dynamics and catalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5637/.

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A series of imidazolium salts of the type [BocNHCH2CH2ImR]X (Boc = t-Bu carbamates; Im = imidazole) (R = Me, X = I, 1a; R = Bn, X = Br, 1b; R = Trityl, X = Cl, 1c) and [BnImR’]X (R’ = Me, X = Br, 1d; R’ = Bn, X = Br, 1e; R’ = Trityl, X = Cl, 1g; R’ = tBu, X = Br, 1h) bearing increasingly bulky substituents were synthetized and characterized. Subsequently, these precursors were employed in the synthesis of silver(I)-N-heterocyclic (NHC) complexes as transmetallating reagents for the preparation of rhodium(I) complexes [RhX(NBD)(NHC)] (NHC = 1-(2-NHBoc-ethyl)-3-R-imidazolin-2-ylidene; X = Cl;

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Patra, A. "N-heterocyclic carbene-organocatalyzed umpolung of aldehydes and imines for new synthetic transformations." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2017. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4272.

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