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Quaternary Stereocenters: Challenges and Solutions for Organic Synthesis, Jens Christoffers

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Автор: Jens Christoffers
Название:  Quaternary Stereocenters: Challenges and Solutions for Organic Synthesis
Издательство: Wiley
Классификация:
Органическая химия

ISBN: 3527311076
ISBN-13(EAN): 9783527311071
ISBN: 3-527-31107-6
ISBN-13(EAN): 978-3-527-31107-1
Обложка/Формат: Hardback
Страницы: 359
Вес: 0.816 кг.
Дата издания: 18.11.2005
Язык: ENG
Иллюстрации: Illustrations (some col.)
Размер: 24.49 x 17.73 x 2.26 cm
Читательская аудитория: Professional & vocational
Подзаголовок: Challenges and solutions for organic synthesis
Ссылка на Издательство: Link
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Поставляется из: Англии
Описание: Filling the gap in the literature, this book presents everything there is to know about this topic. By comprehensively covering the quaternary stereocenters found in a range of important and useful molecules in pharmaceutical and medicinal applications, as well as in thousands of natural products, the book provides the know-how chemists need to synthesize challenging molecules with numerous applications. A must for organic chemists in academia, the pharmaceutical industry and medicine. From the Contents: Important Natural Products Important Pharmaceuticals and Intermediates Aldol Reactions Michael Reactions and Conjugate Additions Cycloaddition Reactions Rearrangement Reactions Alkylation of Ketones and Imines Asymmetric Allylic Alkylation Asymmetric Cross Coupling and Heck Reactions Phase Transfer Catalysis Enzymatic Methods Radical Reactions
Дополнительное описание: Кол-во стр.: 344
Формат: 240 x 170
Дата издания: 2005
Круг читателей: research, professional



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Quaternary Ammonium Salts in Organocatalysis

Автор: Jean-Francois Briere
Название: Quaternary Ammonium Salts in Organocatalysis
ISBN: 1785481274 ISBN-13(EAN): 9781785481277
Издательство: Elsevier Science
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Цена: 4781 р.
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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 Br nsted 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
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