Investigation of Reactions Involving Pentacoordinate Intermediates PDF Download
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Author: Peter A Byrne
Publisher: Springer Science & Business Media
ISBN: 3642320457
Category : Science
Languages : en
Pages : 246
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Book Description
In this thesis, the author outlines the discovery of an effect common to representative examples of all Li salt-free Wittig Reactions. The implications of such a universally applicable effect are that all such Wittig reactions occur through the same mechanism. Although the Wittig reaction was first discovered in 1953, its reaction mechanism has never been definitively settled with many different variants proposed and disproved. The work in this thesis shows conclusively that for [2+2] cycloadditions all Wittig reactions occur by the same irreversible mechanism. In addition, the author also describes a new chromatography-free method for the removal of phosphine oxide from the alkene crude product of the Wittig reaction. The work in this thesis has led to several publications in high-profile journals.
Author: Peter A Byrne
Publisher: Springer Science & Business Media
ISBN: 3642320457
Category : Science
Languages : en
Pages : 246
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Book Description
In this thesis, the author outlines the discovery of an effect common to representative examples of all Li salt-free Wittig Reactions. The implications of such a universally applicable effect are that all such Wittig reactions occur through the same mechanism. Although the Wittig reaction was first discovered in 1953, its reaction mechanism has never been definitively settled with many different variants proposed and disproved. The work in this thesis shows conclusively that for [2+2] cycloadditions all Wittig reactions occur by the same irreversible mechanism. In addition, the author also describes a new chromatography-free method for the removal of phosphine oxide from the alkene crude product of the Wittig reaction. The work in this thesis has led to several publications in high-profile journals.
Author: Takeshi Takeda
Publisher: John Wiley & Sons
ISBN: 352760538X
Category : Science
Languages : en
Pages : 365
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Book Description
While this important reaction class is among the most important and most widely used in organic chemistry, this is the first book to summarize the many different olefination methods, including: * Wittig reaction * Peterson reaction * Julia olefination * Utilizing the Tebbe and related reagents * Low-valent chromium, zinc or titanium mediated olefination * McMurry coupling plus the related reactions in each case and the application to asymmetric synthesis. It thus collates in one ready reference the current level of knowledge as well as new developments in this constantly evolving field -- information which until now has been dispersed throughout the literature.
Author: Roman Valiulin
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110608375
Category : Science
Languages : en
Pages : 249
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Book Description
This book summarizes 100 essential mechanisms in organic chemistry ranging from classical such as the Reformatsky Reaction from 1887 to recently elucidated mechanism such as the copper(I)-catalyzed alkyne-azide cycloaddition. The reactions are easy to grasp, well-illustrated and underpinned with explanations and additional information.
Author: Friedrich L Boschke
Publisher:
ISBN: 9783112597491
Category :
Languages : en
Pages : 0
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Book Description
Author: A.W. Johnson
Publisher: Elsevier
ISBN: 0323162797
Category : Science
Languages : en
Pages : 399
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Book Description
Organic Chemistry, Volume 7: Ylid Chemistry focuses on the physical and chemical properties of ylids. This book discusses the Wittig synthesis of olefins, which involves the reaction between carbonyl compounds and phosphonium ylids. Organized into two parts encompassing nine chapters, this book starts with an overview of the definition of ylids as a substance in which a carbanion is attached directly to a heteroatom transporting a high degree of positive charge. This text then examines the unique stabilization that afforded the carbanions by the presence of the adjacent 'onium atom group, which is the special characteristic of ylids. Other chapters consider the general structure of phosphonium ylids, which virtually has no limitation on the nature of the X groups on phosphorus. This book discusses as well the Wittig reaction involving a condensation-elimination between a phosphonium ylid and ketone. The final chapter deals with the various aspects of the chemistry of sulfur ylids. This book is a valuable resource for chemists.
Author: Hans Jürgen Bestmann
Publisher: Springer Verlag
ISBN: 9780387119076
Category : Science
Languages : en
Pages : 236
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Book Description
Author: Kendall N. Houk
Publisher: Springer
ISBN: 9783662153161
Category : Science
Languages : en
Pages : 238
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Book Description
Author: Daniel E. Levy
Publisher: CRC Press
ISBN: 1420027956
Category : Medical
Languages : en
Pages : 904
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Book Description
Intrigued as much by its complex nature as by its outsider status in traditional organic chemistry, the editors of The Organic Chemistry of Sugars compile a groundbreaking resource in carbohydrate chemistry that illustrates the ease at which sugars can be manipulated in a variety of organic reactions. Each chapter contains numerous examples demonst
Author: Peter Goekjian
Publisher: Academic Press
ISBN: 012803789X
Category : Science
Languages : en
Pages : 796
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Book Description
Carbon analogs of carbohydrates, dubbed C-glycosides, have remained an important and interesting class of mimetics, be it in natural product synthesis, for pharmacological applications, as conformational probes, or for biological studies. C-Furanosides: Synthesis and Stereochemistry provides a much-needed overview of synthetic and stereochemical principles for C-furanosides: analogs of a 5-membered ring carbohydrate glycoside (furanoside), in which the anomeric oxygen has been replaced with a carbon. While our understanding of conformational behavior and of stereoselective synthesis in 6-membered ring compounds is quite good, our ability to predict the conformation of 5-membered ring compounds, or to predict the stereochemical outcome of a given reaction, remains anecdotal. Through a comprehensive review of literature approaches to the different C-furanoside stereoisomers, as well as an interpretation of the outcome in terms of a reasonable number of stereochemical models, C-Furanosides: Synthesis and Stereochemistry enables the reader to determine the best approach to a particular C-glycoside compound, and also hopes to provide a certain level of rationalization and predictability for the synthesis of new systems. - Provides a comprehensive review of the growing literature in C-furanosides - Enables readers to choose the most convenient approach to access a defined target in natural products synthesis or pharmacology and make reasonable predictions for the stereochemical outcome in unpublished cases - Explores the various rational models for stereochemical analysis of furanoside reactivity, with a clear distinction made between physical chemical mechanisms and stereochemical models
Author: Nicola Petragnani
Publisher: Elsevier
ISBN: 0080474926
Category : Science
Languages : en
Pages : 400
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Book Description
The increasing number of publications that use tellurium clearly demonstrates the important role of tellurium compounds as unique and powerful tools in a broad range of organic chemical manipulations, often characterized by their selective behavior. Tellurium in Organic Synthesis provides an overview of the principal aspects of organic tellurium chemistry. Many chapters have been enriched and updated in this second edition. New chapters include overviews of toxicology and pharmacology and a review on the preparation and reactivity of several tellurium heterocycles. The first part of the book focuses on the preparation of selected inorganic tellurium compounds and on the main classes of organotellurium compounds. The second part, and main interest of the book, details the use of these inorganic and organic compounds as reagents to perform specific organic manipulations and synthesis. Reactions covered include reduction, formation and reaction of anionic species, deprotection, tellurium cyclizations, formation of alkenes, use of vinyllic tellurides, free radical chemistry, transmetallations, and removal of tellurium. - Overview of inorganic and organic tellurium chemistry - Synthetic applications of tellurium compounds - All topics accompanied by detailed experimental procedures
