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Radical and Ion pairing Strategies in Asymmetric Organocatalysis

Radical and Ion pairing Strategies in Asymmetric Organocatalysis
  • Author : Maxime R Vitale
  • Publsiher : Elsevier
  • Release : 21 July 2017
  • ISBN : 0081011555
  • Pages : 184 pages
  • Rating : 4/5 from 21 ratings
GET THIS BOOKRadical and Ion pairing Strategies in Asymmetric Organocatalysis

Summary:
Considering the challenge of sustainability facing our society in the coming decades, catalysis is without any doubt a research area of major importance. In this regard, asymmetric organocatalysis, now considered a pillar of green chemistry, deserves particular attention. The first chapter of this volume examines the topic of asymmetric organocatalysis in light of radical chemistry. Recent important progress in this field has been attained by promoting the formation and harnessing the high reactivity of open-shell intermediates. Merging organocatalysis with radical chemistry has been the key to solving some longstanding bottlenecks, and has also significantly contributed to reinforcing the key role of organocatalysis in asymmetric catalysis. This chapter presents the most significant developments in this area, with a particular focus on asymmetric SOMO- and photoredox-organocatalyzed transformations. Chapter 2 focuses on quaternary ammonium salts (R4N+X-), especially chiral derivatives, and their behavior as unique catalysts in organocatalysis. Forming chiral ion-pairs capable of promoting asymmetric reactions, they also operate as unique “transporters involved in phase transfer catalytic processes between liquid–liquid or liquid–solid systems. Furthermore, they offer unique opportunities when forming cooperative ion-paired entities R4N+X-, allowing a synergistic implication of the counter-ion X- either as Brønsted bases or Lewis bases. Specific design of such chiral catalysts in modern chemistry and better insight into their mode of activation facilitates efficient and unprecedented chemical transformations. This chapter provides an overview of the use of chiral quaternary ammonium salts in organocatalysis, emphasizing both general mechanistic aspects and the scope of this approach. Presents the most significant developments with a particular focus on asymmetric SOMO- and photoredox-organocatalyzed transformations Givies a larger overview of chiral ammonium salts in organocatalysis rather than a specific review dedicated to specialists in this area Affords a historical evolution of this field of research


Radical and Ion-pairing Strategies in Asymmetric Organocatalysis

Radical and Ion-pairing Strategies in Asymmetric Organocatalysis
  • Author : Maxime R Vitale,Sylvain Oudeyer,Vincent Levacher,Jean-Francois Briere
  • Publisher : Elsevier
  • Release : 21 July 2017
GET THIS BOOKRadical and Ion-pairing Strategies in Asymmetric Organocatalysis

Considering the challenge of sustainability facing our society in the coming decades, catalysis is without any doubt a research area of major importance. In this regard, asymmetric organocatalysis, now considered a pillar of green chemistry, deserves particular attention. The first chapter of this volume examines the topic of asymmetric organocatalysis in light of radical chemistry. Recent important progress in this field has been attained by promoting the formation and harnessing the high reactivity of open-shell intermediates. Merging organocatalysis with radical

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Organocatalysis

Organocatalysis
  • Author : Maurizio Benaglia
  • Publisher : Walter de Gruyter GmbH & Co KG
  • Release : 19 July 2021
GET THIS BOOKOrganocatalysis

Organocatalysis is considered today one of the three pillars in asymmetric catalysis, along with biocatalysis and organometallic catalysis. The possibility to combine organocatalysis with radical chemistry, photocatalysis and enabling technologies opened new avenues in organic synthesis.

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Asymmetric Organocatalysis

Asymmetric Organocatalysis
  • Author : Benjamin List
  • Publisher : Springer
  • Release : 04 May 2012
GET THIS BOOKAsymmetric Organocatalysis

As nucleophiles, simple alkenes are typically so unreactive that only highly active electrophiles, such as carbocations, peroxides, and halogens will react with them. For the generation of carbon-carbon bonds, milder methods will often be required. Fortunately, it is possible to increase the reactivity of alkene-type p-nucleophiles by introducing electron-donating substituents. Substitution of one H with an OH or OR gives an enol or a vinyl ether, which are already much better nucleophiles. Using nitrogen instead of oxygen, one obtains even

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Recent Advances in Organocatalysis

Recent Advances in Organocatalysis
  • Author : Iyad Karamé,Hassan Srour
  • Publisher : BoD – Books on Demand
  • Release : 28 September 2016
GET THIS BOOKRecent Advances in Organocatalysis

Organocatalysis has recently attracted enormous attention as green and sustainable catalysis. It was realized as a fundamental field providing wide families of catalysts for important organic transformations. It will certainly develop in the future. Given the diversity of accessible transformations, metal-catalyzed reactions have become major tools in organic synthesis that will undoubtedly continue to have an important impact in the future. Alternatively, over the last years, a metal-free approach such as organocatalysis has reached a level of faithfulness, allowing researchers

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Anion-Binding Catalysis

Anion-Binding Catalysis
  • Author : Olga Garcia-Mancheno
  • Publisher : John Wiley & Sons
  • Release : 28 December 2021
GET THIS BOOKAnion-Binding Catalysis

Explores the potential of new types of anion-binding catalysts to solve challenging synthetic problems Anion-Binding Catalysis introduces readers to the use of anion-binding processes in catalytic chemical activation, exploring how this approach can contribute to the future design of novel synthetic transformations. Featuring contributions by world-renowned scientists in the field, this authoritative volume describes the structure, properties, and catalytic applications of anions as well as synthetic applications and practical analytical methods. In-depth chapters are organized by type of catalyst rather

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Fluorous Chemistry

Fluorous Chemistry
  • Author : István T. Horváth
  • Publisher : Springer
  • Release : 03 November 2011
GET THIS BOOKFluorous Chemistry

Structural, Physical, and Chemical Properties of Fluorous Compounds, by J.A. Gladysz Selective Fluoroalkylation of Organic Compounds by Tackling the “Negative Fluorine Effect”, by W. Zhang, C. Ni and J. Hu Synthetic and Biological Applications of Fluorous Reagents as Phase Tags, by S. Fustero, J. L. Aceña and S. Catalán Chemical Applications of Fluorous Reagents and Scavengers, by Marvin S. Yu Fluorous Methods for the Synthesis of Peptides and Oligonucleotides, by B. Miriyala Fluorous Organic Hybrid Solvents for

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Modern Strategies for Heterocycle Synthesis

Modern Strategies for Heterocycle Synthesis
  • Author : Gianfranco Favi
  • Publisher : MDPI
  • Release : 17 March 2021
GET THIS BOOKModern Strategies for Heterocycle Synthesis

Heterocycles feature widely in natural products, agrochemicals, pharmaceuticals and dyes, and their synthesis is of great interest to synthetic chemists in both academia and industry. The contributions of recent applications of new methodologies in C–H activation, photoredox chemistry, cross-coupling strategies, borrowing hydrogen catalysis, multicomponent and solvent-free reactions, regio- and stereoselective syntheses, as well as other new, attractive approaches for the construction of heterocyclic scaffolds are of great interest. This Special Issue is dedicated to featuring the latest research that

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New Organocatalytic Strategies for the Selective Synthesis of Centrally and Axially Chiral Molecules

This thesis discusses the use of asymmetric organic catalysis for the direct enantioselective synthesis of complex chiral molecules, and by addressing the many aspects of both vinylogy and atropisomerism, it appeals to researchers and scholars interested in both areas. Organocatalysis is a relatively modern and “hot” topic in the chemical community; it is constantly expanding and its use has been extended to interesting areas like vinylogous reactivity and atropisomerism. Vinylogous systems are very important for their synthetic applications but also

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Asymmetric Catalysis

Asymmetric Catalysis
  • Author : B. Bosnich
  • Publisher : Springer Science & Business Media
  • Release : 06 December 2012
GET THIS BOOKAsymmetric Catalysis

The rate of advance in areas of science is seldom constant. Usually certain fields effloresce with activity because of the ~ealization that solutions are possible to long standing important problems. So it is now with asymmetric catalysis, a field which promises to change profoundly the strategic thinking of synthetic chemists. As this Report will show, reagents which can induce catalytic enantiocontrol of chemical transformations could represent the ultimate synthetic method. Nearly all synthetic strategies of complex molecules involve steps which

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Organophosphorus Chemistry

Organophosphorus Chemistry
  • Author : David W Allen,David Loakes,John C Tebby
  • Publisher : Royal Society of Chemistry
  • Release : 10 April 2019
GET THIS BOOKOrganophosphorus Chemistry

This annual review of the literature presents a comprehensive and critical survey of the vast field of study involving organophosphorus compounds, from phosphines and related P-C bonded compounds to phosphorus acids, phosphine chalcogenides and nucleotides. The Editors have added to the content with a timely chapter on the recent developments in green synthetic approaches in organophosphorus chemistry to reflect current interests in the area. With an emphasis on interdisciplinary content, this book is aimed at the worldwide organic chemistry and

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Organophosphorus Chemistry

Organophosphorus Chemistry
  • Author : David W Allen,David Loakes,Lee J Higham,John C Tebby
  • Publisher : Royal Society of Chemistry
  • Release : 15 April 2020
GET THIS BOOKOrganophosphorus Chemistry

This annual review of the literature presents a comprehensive and critical survey of the vast field of study involving organophosphorus compounds, from phosphines and related P-C bonded compounds to phosphorus acids, phosphine chalcogenides and nucleotides. The Editors have added to the content with a timely chapter on the recent developments in green synthetic approaches in organophosphorus chemistry to reflect current interests in the area. With an emphasis on interdisciplinary content, this book is aimed at the worldwide organic chemistry and

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Catalysis with Earth-abundant Elements

Catalysis with Earth-abundant Elements
  • Author : Uwe Schneider,Stephen Thomas
  • Publisher : Royal Society of Chemistry
  • Release : 30 October 2020
GET THIS BOOKCatalysis with Earth-abundant Elements

Considering the limited resources of our planet, earth-abundant elements will have to be explored increasingly in the future. This book highlights the uses of the most earth-abundant elements in catalysis and will be of interest to graduates, academic researchers and practitioners in catalysis.

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Dienamine Catalysis for Organic Synthesis

Dienamine Catalysis for Organic Synthesis
  • Author : Kengadarane Anebouselvy,Dhevalapally B Ramachary,Indresh Kumar
  • Publisher : Royal Society of Chemistry
  • Release : 02 March 2018
GET THIS BOOKDienamine Catalysis for Organic Synthesis

In the past decade a new era in asymmetric catalysis has been realised by the discovery of L-proline induced chiral enamines from carbonyls. Inspired by this, researchers have developed many other primary catalytic species in situ, more recently secondary catalytic species such as aminals have been identified for use in asymmetric synthesis. High-yielding asymmetric synthesis of bioactive and natural products through mild catalysis is an efficient approach in reaction engineering. In the early days, synthetic chemists mainly focused on the

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