Allenes In Organic Synthesis

Illustrates alternate and frequently superior methods for synthesizing complex molecules, focusing on those allenes that form either carbon-carbon bonds, or carbon-heteroatom bonds. The material is extremely useful in keeping the organic chemist up-to-date on the latest methods for their preparation.

There is a vast and often bewildering array of synthetic methods and reagents available to organic chemists today. The Best Synthetic Methods series allows any scientist who is interested in the chemical transformations of molecules to choose between all the alternatives and assess their real advantages and limitations. With the emphasis on laboratory use, these volumes represent a comprehensive and practical guide to modern synthetic organic chemistry. This book is the product of the author's many years practical experience and reading of the original literature. It contains a valuable distillation and critical evaluation of the Best Synthetic Methods for the formation and reaction of molecules containing carbon-carbon triple bonds or cumulative carbon-carbon double bonds. A brief review of each area is provided, but the emphasis in all cases is on describing efficient practical methods to effect the transformations described. The reader can therefore use this book to rapidly review and select the best methods of performing a synthetic conversion to create or modify a molecule containing an acetylene, allene or cumulene functionality. In addition, the documentation of a large number of experimental recipes enables the user to synthesise an unsaturated molecule without the need to access to the original literature. - Reviews and evaluates the various methods for the formation and reaction of acetylenes, cumulenes and allenes. - Provides detailed practical experimental for many important reactions. - General tips and analytical data are provided from the author's own extensive research in this area.

There is a vast and often bewildering array of synthetic methods and reagents available to organic chemists today. The Best Synthetic Methods series allows any scientist who is interested in the chemical transformations of molecules to choose between all the alternatives and assess their real advantages and limitations. With the emphasis on laboratory use, these volumes represent a comprehensive and practical guide to modern synthetic organic chemistry. Best Synthetic Methods: Acetylenes, Allenes and Cumulenes is the product of the author's many years practical experience and reading of the original literature. It contains a valuable distillation and critical evaluation of the Best Synthetic Methods for the formation and reaction of molecules containing carbon-carbon triple bonds or cumulative carbon-carbon double bonds. A brief review of each area is provided, but the emphasis in all cases is on describing efficient practical methods to effect the transformations described. The reader can therefore use this book to rapidly review and select the best methods of performing a synthetic conversion to create or modify a molecule containing an acetylene, allene or cumulene functionality. In addition, the documentation of a large number of experimental recipes enables the user to synthesise an unsaturated molecule without the need to access to the original literature. Reviews and evaluates the various methods for the formation and reaction of acetylenes, cumulenes and allenes Provides detailed practical experimental for many important reactions General tips and analytical data are provided from the author's own extensive research in this area

Volume 4 focuses on additions and the resulting substitutions at carbon-carbon &pgr;-bonds. Part 1 includes processes generally considered as simple polar reactions, reactive electrophiles and nucleophiles adding to alkenes and alkynes. A major topic is Michael-type addition to electron deficient &pgr;-bonds, featured in the first six chapters. In part 2 are collected the four general processes leading to nucleophilic aromatic substitution, including radical chain processes and transition metal activation through to &pgr;-complexation. Metal-activated addition (generally by nucleophiles) to alkenes and polyenes is presented in part 3, including allylic alkylation catalyzed by palladium. The coverage of nonpolar additions in part 4 includes radical additions, organometal addition (Heck reaction), carbene addition, and 1,3-dipolar cycloadditions.

In this two-volume handbook, the editors Norbert Krause and A. Stephen K. Hashmi present all the important aspects and facts related to this hot topic. The treatment covers the whole range from the synthesis and classification via reactions right up to possible applications in the synthesis of natural products and drugs. With their excellent contributions an international team of outstanding authors highlight the multifarious uses and classes of allenes, making this an indispensable work for every organic chemist. From the Table of Contents: SYNTHESIS OF ALLENES Synthesis of Allenes by Isomerization Reactions Metal-Mediated Synthesis of Allenes Transition-Metal-Catalyzed Synthesis of Allenes Enantioselective Synthesis of Allenes SPECIAL CLASSES OF ALLENES Allenic Hydrocarbons - Preparation and Use in Organic Synthesis Cyclic Allenes Acceptor-Substituted Allenes Donor-Substituted Allenes Synthesis and Reactions of Allenylmetal Reagents REACTIONS OF ALLENES Ionic Additions to Allenes Fundamentals and Application of Free Radical Addition to Allenes Cycloadditions of Allenes Cyclizations of Allenes Transitions-Metal-Catalyzed Cross Couplings of Allenes Transitions-Metal-Catalyzed Cycloisomerizations of Allenes Transition-Metal-Catalyzed Addition/Cycloadditions of Allenes Oxidation of Allenes APPLICATIONS Allenic Natural Products and Phamaceuticals Allenes in Natural Product Synthesis Enyne-Allenes

Advances in the Use of Synthons in Organic Chemistry: A Research Annual, Volume 1 provides information pertinent to a useful reagent that can perform a certain chemical operation that is otherwise impossible or difficult to carry out. This book presents the developments on established synthons. Organized into four chapters, this volume begins with an overview of the significant role of the formyl group in synthetic methodologies, which has stimulated the search for other reagents. This text then describes trimethysilyldiazomethane as a stable and safe substitute for hazardous diazomethane. Other chapters consider the usefulness of trimethysilyldiazomethane in organic syntheses. This book discusses as well that malonic amides, silylenol ethers, malonic esters, and tetra-donor-substituted allenes serve as synthetic equivalents for the dianions of malonic esters, ketones, and malonic amides. The final chapter deals with the synthesis of biologically-active compounds, which has been one of the major challenges for organic chemists. This book is a valuable resource for practicing synthetic chemists.