الصفحة 1
الصفحة 1
Heterogeneous Enantioselective Hydrogenation : Theory and Practice
The book looks at the first relatively ineffective catalysts right through to modern highly effective enantioselective catalytic systems, comparable in their efficiency to chiral metal complexes and enzymatic systems. The book begins with a summary of the first work on heterogeneous metal catalysts, which showed only the principal possibilities of enantioselective reactions. The book then elaborates on metal catalysts which have enantioselectivities close to 100%. Finally, the book describes the practical utilization of chiral catalytic systems in processes of hydrogenation. The a - and b -hydroxy carboxylic acid esters produced are precursors for manufacturing many synthones used for medicines as well as for monomers used for biodegradable polyesters, both of which have important practical applications. The book summarizes more than 800 scientific papers in the field of enantioselective catalytic hydrogenation reactions, mainly those using heterogeneous metal catalysts. It provides detailed explanations of special techniques for the preparation of effective dissymmetric catalysts which provide highly efficient catalytic systems.
Chiral Diazaligands for Asymmetric Synthesis
The use of phosphine derivatives has historically induced the tremendous development of catalysis (both non-asymmetric and asymmetric). Although the chemistry of amines is more documented, the use of nitrogen-containing ligands only appeared recently. Nevertheless, during the last ten years, the results describing chiral diamine preparations and their uses in asymmetric catalysis and synthesis are increasing faster than their phosphorus counterparts. The reader will find in this volume the most recent methods for the synthesis of chiral diamines as well as their applications in asymmetric catalysis of CC bond formation. Particular attention will be given to spartein and derivatives of such diamines. Recently, the particular properties and the chemistry of amines allowed to obtain catalysts easy to separate and recycle and new types of ligands such as diaminocarbenes, ureas and thioureas. Finally, the complexing properties of some diamines allowed the formation of complexes with chirality "at the metal " which is of major theoretical interest and presents numerous potential applications.
Catalytic role of amino acids in organic reactions
Asymmetric organometallic and organocatalytic processes have attracted great interest. Asymmetric synthesis using both natural and unnatural amino acids has been tremendously important from synthetic as well as industrial viewpoints, and numerous new methodologies have been developed in the last decades. Herein we provide an overview of old and very recent (since 1900 till now) advances and applications in the area of heterogeneous catalysis, homogeneous catalysis, electrocatalysis, photocatalysis, organocatalysis, thermal catalysis using amino acids [proline, glycine, alanine, valine, serine, threonine, cysteine, methionine, asparagine, glutamine, lysine, arginine, histidine, aspartate, glutamate, phenylalanine, and tryptophan], (supported or unsupported), an amino acid containing materials or amino acids derivatives as an essential component of catalysts, this book highlights the most important and recent developments to immobilize or support amino acids on various support materials. This book is suitable as supplementary reading for courses targeting the design, synthesis, and application of chiral catalysts, asymmetric catalysis, and sustainable production.
Axially chiral compounds : Asymmetric synthesis and applications
Appearing widely in natural products, biologically active molecules, asymmetric chemistry, and material science, axially chiral motifs constitute the core backbones of the majority of chiral ligands and organocatalysts in asymmetric catalysis. In a new work of particular relevance to synthetic chemists, Axially Chiral Compounds: Asymmetric Synthesis and Applications delivers a clearly structured and authoritative volume covering the classification, characteristics, synthesis, and applications of axial chirality.
Amplification of Chirality
Amplification of Chirality presents critical reviews of the present position and future trends in modern chemical research. The book contains short and concise reports on chemistry. Each is written by the world renowned experts. Still valid and useful after 5 or 10 years, more information as well as the electronic version of the whole content available at: springerlink.com.
