La synthèse Fischer-Tropsch permet de produire des carburants propres à partir du gaz naturel, de la biomasse ou du charbon. Les carburants issus d'une synthèse Fischer-Tropsch sont totalement exempts de soufre et de composés aromatiques. Cette thèse présente de nouvelles approches de conception des catalyseurs Fischer-Tropsch à base de cobalt supportés par des silices mésoporeuses. Ces approches sont fondées sur la promotion de catalyseurs par le ruthénium et la zircone, sur l'utilisation de la technique plasma pour la décomposition du précurseur de cobalt, ainsi que sur l'étude cinétique des étapes élémentaires de la réaction Fischer-Tropsch dans des conditions transitoires dont la méthode TAP. La structure des catalyseurs a été caractérisée à chaque étape de leur synthèse et de leur activation par des techniques physico-chimiques dont certaines techniques in-situ. Il a été démontré que la promotion des catalyseurs avec le ruthénium et l'oxyde de zirconium dépendait fortement de la texture du support. La promotion améliore la performance catalytique de façon plus importante pour les catalyseurs supportés par les silices qui possèdent des pores plus étroits. L'utilisation de la technique plasma pour la décomposition du cobalt permet de contrôler efficacement la taille des nanoparticules de cobalt et donc d'améliorer de façon significative les performances catalytiques. Les études transitoires et la modélisation des étapes élémentaires ont fourni des informations fondamentales sur la nature des sites actifs des catalyseurs à base de cobalt pour la réaction Fischer-Tropsch.

In less than 20 years N-heterocyclic carbenes (NHCs) have become well-established ancillary ligands for the preparation of transition metal-based catalysts. This is mainly due to the fact that NHCs tend to bind strongly to metal centres, avoiding the need of excess ligand in catalytic reactions. Also, NHC‒metal complexes are often insensitive to air and moisture, and have proven remarkably resistant to oxidation. This book showcases the wide variety of applications of NHCs in different chemistry fields beyond being simple phosphine mimics. This second edition has been updated throughout, and now includes a new chapter on NHC‒main group element complexes. It covers the synthesis of NHC ligands and their corresponding metal complexes, as well as their bonding and stereoelectronic properties and applications in catalysis. This is complemented by related topics such as organocatalysis and biologically active complexes. Written for organic and inorganic chemists, this book is ideal for postgraduates, researchers and industrialists.

Covers all the aspects of the recent achievements in silver catalyzed reactions Silver catalysis has emerged as a powerful tool in the field of organic synthesis. This comprehensive book systematically explores the unique performance of silver catalysis, introducing all the recent progress of silver catalysis in organic synthesis. It clearly emphasizes the unique features of silver catalysis and provides the reaction mechanism involved. This two-volume book also provides vivid schematics and tables throughout to enhance the accessibility to the relevant theory and mechanisms. Silver Catalysis in Organic Synthesis begins with an introduction to Silver Chemistry before moving on to chapters covering: Silver-Catalyzed Cycloaddition Reactions; Silver-Catalyzed Cyclizations; Silver-Mediated Radical Reactions; Silver-Mediated Fluorination, Perfluoroalkylation and Trifluoromethylthiolation Reactions; Coupling Reactions and C-H Functionalization; Silver-Catalyzed CO2 Incorporation; Silver-Catalyzed Carbene, Nitrene, and Silylene Transfer Reactions; Asymmetric Silver-Catalyzed Reactions; Silver-Catalyzed Reduction and Oxidation of Aldehydes and Their Derivatives; Silver Complexes in Organic Transformations; and Silver Nanoparticles in Organic Transformations. -Covers recently developed organic reactions catalyzed by silver, along with their reaction mechanism -Introduces many new reactions and mechanisms related to silver catalysis -Offers professionals and newcomers in the related fields a survey of new advances in silver catalysis in organic synthesis Silver Catalysis in Organic Synthesis will appeal to a wide readership including chemists, biochemists, pharmaceutical scientists, biomedical researchers, agriculture scientists, and graduate students in the related fields.

Each chapter of Phosphorus Compounds: Advanced Tools in Catalysis and Material Sciences have been carefully selected by the editors in order to represent a state-of-the-art overview of how phosphorus chemistry can provide solutions in various fields of applications. The editors have assembled an international array of world-renowned scientists and each chapter is written by experts in the fields of synthetic chemistry, homogeneous catalysis, dendrimers, theoretical calculations, materials science, and medicinal chemistry with a special focus on the chemistry of phosphorus compounds. Phosphorus Compounds: Advanced Tools in Catalysis and Material Sciences is of interest to a general readership ranging from advanced university course students to experts in academia and industry.

This volume brings together contributions by leading researchers covering a wide scope so characteristic of fluorine chemistry. It is a monograph of historical character comprising personalized accounts of progress and events in areas of particular interest.There is also much to interest and instruct chemists from other disciplines as a good proportion of the chapters contain a considerable amount of 'hard' referenced information relating to modern organic, organoelemental and inorganic chemistry. Historians of chemistry and technology will no doubt be tempted to dip into this book, and surely whoever addresses the task of commemorating Moissan's achievement at the 150-years stage will bless us all in some measure for its existence.

In view of increasing interest in organofluorine compounds, this book was undertaken to describe biological and physical properties of organofluorine compounds, synthetic methods of these, their roles in pharmaceutical, agrochemical and material sciences. In particular, the book will emphasize on the usefulness of fluorination reaction, availability of fluorination agents, so that even graduate students who are unfamiliar to this field can understand and participate in this fascinating heteroatom chemistry.