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Dissertations / Theses on the topic 'Thiourea Catalysts'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Nickerson, David M. "Unique Reactivity Patterns of Enhanced Urea Catalysts." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1395859006.

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2

Yang, Die Daisy. "Development of polymers for electroplating waste water purification, polymer-supported reagents for organic synthesis and heterogeneous catalysts for aerobic alcohol oxidation reactions." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B39848887.

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3

Jones, Charlotte E. S. "Enantioselective homogeneous catalysts for the synthesis of fluorinated organic compounds." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2611.

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This thesis is divided into three main results chapters that reflect the path my research took. In the first results chapter, the first organocatalyst for the carbonyl-ene reaction was discovered and found to give high conversion using 1,3-bis(3,5-bis(trifluoromethyl)phenyl)thiourea. Various carbonyl and alkene precursors were examined in the ene reaction in both catalysed and uncatalysed reactions. It was found that ene reactions using fluoral and ethyl trifluoropyruvate give higher rates of reaction when compared to other carbonyl compounds. A novel enantiopure thiourea was synthesised and t

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4

Yang, Min. "Explorations on transition metal-catalyzed enantioselective cyclization reactions and applications of thiourea ligands." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36784527.

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5

Yang, Min, and 楊敏. "Explorations on transition metal-catalyzed enantioselective cyclization reactions and applications of thiourea ligands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36784527.

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6

Yang, Die Daisy, and 楊蝶. "Development of polymers for electroplating waste water purification, polymer-supported reagents for organic synthesis and heterogeneouscatalysts for aerobic alcohol oxidation reactions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39848887.

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7

Broan, Christopher John. "A mechanistic study of the acid and base catalysed reactions of thiourea, 1-substituted thioureas and 1,3 -disubstituted thioureas with 1,2-diketones." Thesis, University of St Andrews, 1989. http://hdl.handle.net/10023/14978.

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Thiourea, 1-substituted thioureas and 1,3-disubstituted thioureas react under acidic or basic catalysis with 1,2-diketones to give a wide variety of products. The nature of the product or products depends on the conditions used, the degree of substitution of the thiourea and on the nature of the aromatic or aliphatic groups attached to the dicarbonyl unit of the diketone. The mechanisms of formation of the various products have been investigated by a variety of techniques, including the determination of rate equations by ultraviolet spectroscopy, the influence of side group substituents on the

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8

Ford, David Dearborn. "The Role of Catalyst-Catalyst Interactions in Asymmetric Catalysis with (salen)Co(III) Complexes and H-Bond Donors." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11154.

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In asymmetric catalysis, interactions between multiple molecules of catalyst can be important for achieving high catalyst activity and stereoselectivity. In Chapter 1 of this thesis, we introduce catalyst-catalyst interactions in the context of the classic Kagan nonlinear effect (NLE) experiment, and present examples of the strengths and drawbacks of the NLE experiment. For the remainder of the thesis, we explore catalyst-catalyst interactions in the context of two different reactions. First, in Chapter 2, we apply a combination of reaction kinetics and computational chemistry to a reaction th

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9

Ngo, Thi Thuy Duong. "Chiral thioureas, thiourea-phosphines and amines derived from biomass : synthesis and applications in asymmetric organocatalysis." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS476.

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Cette thèse porte sur la préparation de nouveaux catalyseurs chiraux à partir de composés naturels issus de la biomasse, et leurs applications en organocatalyse asymétrique. La première partie décrit la synthèse de thiourées énantiomériquement pures dérivées de l'isosorbide et l’isommanide. Ces thiourées ont été évaluées comme catalyseurs organiques dans des réactions asymétriques de Friedel-Crafts, d’alkylation, d’addition de type aza-Michael, d’hydroamination et de type Morita-Baylis-Hillman (MBH). Les meilleurs résultats en termes de réactivité et d’induction asymétrique, ont été obtenus da

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10

Nguyen, Thi-Huong. "Synthèse de nouveaux catalyseurs chiraux à base de la L-proline. Applications en catalyse asymétrique." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112382.

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Depuis de nombreuses années, les phosphines chirales multifonctionnelles se sont révélées être des outils synthétiques puissants en organocatalyse asymétrique. Ces catalyseurs qui contiennent un site de base de Lewis et un site d'acide de Bronsted, ont reçu une attention particulière en raison de leur efficacité pour créer des liaisons C-C avec de très bonnes énantiosélectivités. A notre connaissance, la synthèse d'organocatalyseurs de type thiourée-phosphine dérivés de la (L)-proline n'a jamais été décrite dans la littérature. Ce sujet de thèse concerne la synthèse d'une nouvelle famille d'or

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11

Zamboulis, Alexandra. "Silices hybrides pour l'organocatalyse asymétrique." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2010. http://www.theses.fr/2010ENCM0004.

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L'organocatalyse asymétrique est un domaine en plein développement. L'immobilisation de ce type de catalyseurs pourrait présenter de multiples avantages. Ces travaux de thèse s'intéressent à la préparation de silices hybrides organiques/inorganiques par voie sol-gel et aux applications de ces matériaux en organocatalyse asymétrique. La première partie du manuscrit est consacrée à une présentation bibliographique du sujet. Dans la deuxième partie, l'utilisation de la L-proline comme modèle est décrite. Des matériaux contenant un fragment L-proline ont été préparés et leurs performances catalyti

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12

Koovits, P. J. "Development of an enantioselective reductive nitro-Mannich reaction using thiourea catalysis." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1388704/.

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The introductory chapter of this thesis describes in detail the chemistry of the nitro-Mannich reaction from its inception to the current “state of the art”. Additionally, the products of the nitro-Mannich reaction and their uses in synthesis are also discussed. The final section of the introduction deals with the use of thiourea organocatalysis and its application in synthetic transformations using imines or nitroalkenes as electrophiles. The results and discussion initially focuses on the development of a racemic reductive nitro-Mannich reaction. It has been found that when using Superhydrid

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13

Rampalakos, Konstantinos. "Asymmetric synthesis with vapol derivatives and novel chiral thiourea organocatalysts." Diss., Connect to online resource - MSU authorized users, 2008.

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14

Touchard, François. "Les thiourées : nouveaux ligands pour la catalyse asymétrique." Lyon 1, 1999. http://www.theses.fr/1999LYO10330.

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15

Lin, Song. "Elucidation of the Cation−π Interaction in Small-Molecule Asymmetric Catalysis." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11132.

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The cation–π interaction has been long-established to play an important role in molecular recognition, supramolecular chemistry, and molecular biology. In contrast, its potential application in small-molecule catalysis, especially as a selectivity-determining factor in asymmetric synthesis has been overlooked until very recently. This dissertation begins with an extensive literature review on the state-of-the-art research on the application of cation–π interactions in non-enzymatic catalysis of organic and organometallic transformations. The research in this field has been

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16

Chassillan, Louis. "New Chiral Bifunctional Organocatalysts : Synthesis and Application in Enantioselective Reactions Under Batch and Continuous-Flow Conditions." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPASF027.

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Au cours des dernières années, l’organocatalyse asymétrique a connu un engouement sans précédent et de nombreux catalyseurs organiques ont été synthétisés dans le but d’effectuer des réactions plus rapides et plus sélectives. Cependant, étant donné la demande croissante de molécules chirales dans l’industrie, il demeure crucial de développer de nouveaux outils afin de rendre leur production plus efficace. Pour ce faire, l’utilisation de la catalyse bifonctionnelle apparait comme une évidence du fait de sa capacité à activer simultanément le nucléophile et l’électrophile et ainsi permettre un m

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17

Chandanshive, Jay Zumbar <1983&gt. "Regiocontrolled Synthesis of Pyrazole Derivatives Through 1,3-Dipolar Cycloaddition Reaction And Synthesis of Helicene-Thiourea based and Polymer Supported Soos's Catalyst for Asymmetric Synthesis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5826/1/Chandanshive_JAY_ZUMBAR_Thesis.pdf.

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In first part we have developed a simple regiocontrolled protocol of 1,3-DC to get ring fused pyrazole derivatives. These pyrazole derivatives were synthesized using 1,3-DC between nitrile imine and various dipolarophiles such as alkynes, cyclic α,β-ketones, lactones, thiocatones and lactums. The reactions were found to be highly regiospecific. In second part we have discussed about helicene, its properties, synthesis and applications as asymmetric catalyst.Due to inherent chirality, herein we have made an attempt to synthesize the helicene-thiourea based catalyst for asymmetric catalysi

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18

Chandanshive, Jay Zumbar <1983&gt. "Regiocontrolled Synthesis of Pyrazole Derivatives Through 1,3-Dipolar Cycloaddition Reaction And Synthesis of Helicene-Thiourea based and Polymer Supported Soos's Catalyst for Asymmetric Synthesis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5826/.

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In first part we have developed a simple regiocontrolled protocol of 1,3-DC to get ring fused pyrazole derivatives. These pyrazole derivatives were synthesized using 1,3-DC between nitrile imine and various dipolarophiles such as alkynes, cyclic α,β-ketones, lactones, thiocatones and lactums. The reactions were found to be highly regiospecific. In second part we have discussed about helicene, its properties, synthesis and applications as asymmetric catalyst.Due to inherent chirality, herein we have made an attempt to synthesize the helicene-thiourea based catalyst for asymmetric catalysi

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19

Ibrahim, Houssein. "Synthèse de nouveaux composés chiraux à partir d'isosorbide et d'isomannide : applications en catalyse asymétrique." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112159.

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Ce travail de thèse porte sur la synthèse de nouveaux composés chiraux à partir de l’isosorbide et de l’isomannide en vue de leurs applications en catalyse asymétrique. Dans une première partie, de nouvelles monophosphines ont été synthétisées et appliquées en tant que ligands dans la réaction d'hydrogénation asymétrique d’oléfines. Des excès énantiomériques jusqu’à 96% ont été observés. Elles ont également été employées en tant que catalyseurs organiques dans les réactions de cyclisation [3 +2]. De bonnes activités catalytiques et des excès énantiomériques modestes sont obtenus. Dans une deux

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20

Breuzard, Jérémy. "Nouveaux ligands chiraux pour l'hydroformylation énantiosélective : catalyse homogène, supportée et biphasique." Lyon 1, 2000. http://www.theses.fr/2000LYO10259.

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21

Rey, Nadège. "Synthèse de silices hybrides méso-structurées par auto-assemblage : vers des applications en catalyse." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2019. https://theses.enscm.fr/interne/ENSCM_2019_REY.pdf.

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Les matériaux hybrides à base de silice ont été explorés pour de nombreuses applications allant des micro-lentilles dans le domaine de l’optique à l’encapsulation de médicaments dans celui de la santé. En ce qui concerne le domaine de la catalyse, l’incorporation de cations métalliques dans des réseaux de silice organisés est essentielle pour la conception de catalyseurs supportés. Les matrices siliciques présentent des propriétés mécaniques, une stabilité thermique et une porosité ajustables. Dans la littérature, ces matrices prennent la forme de bâtonnets, d’étoiles, d’haltères, de feuillets

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22

Manna, Madhu Sudan. "Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3664.

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The thesis entitled “Controlling Stereochemistry at the Quaternary Center Using Bifunctional (Thio)urea Catalysis” is divided into five chapters. Chapter 1: Catalytic Enantioselective Construction of Quaternary Stereocenters through Direct Vinylogous Michael Addition of Deconjugated Butenolides to Nitroolefins The direct use of deconjugated butenolides in asymmetric C–C bond forming reaction is a powerful but challenging task because of the additional problem of regioselectivity along with the issues of diastereo- and enantioselectivity. In this chapter, a direct asymmetric vinylogous Michae

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23

Manna, Madhu Sudan. "Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis." Thesis, 2015. http://etd.iisc.ernet.in/2005/3664.

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The thesis entitled “Controlling Stereochemistry at the Quaternary Center Using Bifunctional (Thio)urea Catalysis” is divided into five chapters. Chapter 1: Catalytic Enantioselective Construction of Quaternary Stereocenters through Direct Vinylogous Michael Addition of Deconjugated Butenolides to Nitroolefins The direct use of deconjugated butenolides in asymmetric C–C bond forming reaction is a powerful but challenging task because of the additional problem of regioselectivity along with the issues of diastereo- and enantioselectivity. In this chapter, a direct asymmetric vinylogous Michae

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24

Tripathi, Chandra Bhushan. "Lewis Base and Hydrogen-Bonding Catalysis by Thioureas : From Chemoselective Alcohol Oxidation to Asymmetric Iodofunctionalizations of Alkenes and Dienes." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/4078.

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25

Yalalov, Denis. "Bifunctional Thiourea-Based Organocatalysts for Asymmetric C-C Bond Formation Reactions: Strecker, Nitro-Michael, Mannich." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-ACA2-6.

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