Download or read book Cobalt PCP Pincer and Rhodium Diphosphine Complexes as Methanol Homologation Catalysts written by Mark Kent and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cobalt PCP Pincer and Rhodium Diphosphine Complexes as Methanol Homologation Catalysts written by Mark Alexander Kent and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The first two examples of cobalt phosphine PCP pincer complexes, [Co{2,6- (CH2PPh2-KPhC6H3-K[1}(COh] and [Co{2,6-(CH2PPh2-KPhC6H3-KC1}(PMe3h] have been synthesised from the precursors [CoCl(PMe3)3] and [CO(CH3) (PMe3)4]. Both pincer complexes possess pseudo-trigonal bipyramidal geometry with the coordinating pincer P atoms in equatorial sites and the pincer C atom in an axial site. A route to these pincer complexes has been discovered which involves a rearrangement with loss of PMe3 from the cyclometallated complex [Co{2-(CH2PPh2-KP)-4-(CH2PPh2)C6H3-K[1}(PMe3)3]. The mechanism for this rearrangement has been probed by both kinetic studies and deuterium-labelling studies, which suggests that two mechanisms operate, one of which involves a series of intramolecular C-H oxidative additions and reductive eliminations to effectively 'shuttle' protons around the complex. The other mechanism is suggested to involve a proton source, which may be the solvent, THF. The preparation of some rare examples of cobalt phosphinite PCP pincer complexes based on the diphosphinites 1,3-bis(diphenylphosphinooxy)benzene and 1,3-bis(diphenylphosphinooxy)-4,6-(di-tert-butyl)benzene is also reported. The synthesis of these pincers proceeds via an isolated cobalt(III) pincer complex with hydride, chloride and PMe3 ancillary ligands. The subsequent reduction to cobalt(l) pincer complexes proceeds using NEt3 or LiAlH4 as reducing agents. The new propane-backboned diphosphines 1,3-bis(SH-benzo[b ]phosphindol-S- yl)propane and 1,3-bis(di-2-naphthylphosphino)propane were synthesised. These diphosphines were complexed with [{RhCl(COh}Z] to afford the corresponding dinuclear 12-membered metallacycles [{RhCl(CO)(Il-diphosphine)}2], the latter of which possesses two rotational isomers which involves the exchange of the positions of one Cl and one CO ligand. The diphosphines 1,3-bis(SH- benzo [b] phosphindol-S-yl) propane and o-di phenyl phosphino benzyldi phenyl- phosphine were complexed with [Rh(CODh]BF4 to afford cis-chelating mononuclear Rh(l) complexes. The application of these phosphines and complexes as catalysts for methanol reductive carbonylation and homologation has been investigated. The catalyst involving the tetrahydrochloride salt of 1,3-bis( di-2-pyridylphosphino )propane exhibits methanol reductive carbonylatiori/homologation selectivity superior to the best previously reported literature system. Also, the catalyst involving the diphosphine 1,3-bis(SH-benzo[b ]phosphindol-S-yl)propane exhibits promising stability and selectivity to acetic acid under reductive carbonylation conditions, signalling a potential application as a methanol carbonylation catalyst.
Download or read book Phosphine Modified Rhodium Catalysts for the Carbonylation of Methanol written by Gareth William Lamb and published by . This book was released on 2008 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Model Compound Studies of Cobalt Catalyzed Methanol Homologation written by Jeffrey Thomas Martin and published by . This book was released on 1982 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rhodium I Betadiketone Complexes as Model Catalysts in Methanol Carbonylation written by Alice Brink and published by . This book was released on 2007 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Organometallic Chemistry of Rhodium and Iridium Complexes of Macrocyclic PCP and POCOP Pincer Ligands written by Baptiste Leforestier and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book PCP Pincer Compounds written by Timothy James Reynolds and published by . This book was released on 2012 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Transformations Based on Bond Activation Reactions Using Cobalt and Rhodium Complexes written by Christian P. Lenges and published by . This book was released on 1999 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cyclometalation Reactions written by Iwao Omae and published by Springer Science & Business Media. This book was released on 2014-01-23 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a review of cyclometalation reactions and organometallic intramolecular-coordination five-membered ring products, the most active type of reactions in synthetic organic reactions and their products. Included is the discovery of intramolecular-coordination bonds in cyclometalation reactions and the characteristics of those reactions, as well as the reasons that their five-membered ring compounds are very easily synthesized through such reactions. In addition, the applications of cyclometalation reactions and five-membered ring products, synthetic applications, catalysts, and other products are described. These topics are of special interest for industrial researchers.
Download or read book Superbases for Organic Synthesis written by Tsutomu Ishikawa and published by John Wiley & Sons. This book was released on 2009-01-26 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guanidines, amidines and phosphazenes have been attracting attention in organic synthesis due to their potential functionality resulting from their extremely strong basicity. They are also promising catalysts because of their potential for easy molecular modification, possible recyclability, and reduced or zero toxicity. Importantly, these molecules can be derived as natural products – valuable as scientists move towards “sustainable chemistry”, where reagents and catalysts are derived from biomaterial sources. Superbases for Organic Synthesis is an essential guide to these important molecules for preparative organic synthesis. Topics covered include the following aspects: an introduction to organosuperbases physicochemical properties of organic superbases amidines and guanidines in organic synthesis phosphazene: preparation, reaction and catalytic role polymer-supported organosuperbases application of organosuperbases to total synthesis related organocatalysts: proton sponges and urea derivatives amidines and guanidines in natural products and medicines Superbases for Organic Synthesis is a comprehensive, authoritative and up-to-date guide to these important reagents for organic chemists, drug discovery researchers and those interested in the chemistry of natural products.
Download or read book C H Bond Activation and Catalytic Functionalization II written by Pierre H. Dixneuf and published by Springer. This book was released on 2016-03-10 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Organometallic Chemistry presents critical overviews of research results in organometallic chemistry. As our understanding of organometallic structure, properties and mechanisms increases, new ways are opened for the design of organometallic compounds and reactions tailored to the needs of such diverse areas as organic synthesis, medical research, biology and materials science. Thus the scope of coverage includes a broad range of topics of pure and applied organometallic chemistry, where new breakthroughs are being achieved that are of significance to a larger scientific audience. The individual volumes of Topics in Organometallic Chemistry are thematic. Review articles are generally invited by the volume editors. All chapters from Topics in Organometallic Chemistry are published OnlineFirst with an individual DOI. In references, Topics in Organometallic Chemistry is abbreviated as Top Organomet Chem and cited as a journal.
Download or read book Activation and Functionalization of C H Bonds written by Karen I. Goldberg and published by ACS Symposium. This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Activation and Functionalization of C-H Bonds explores recent developments in the reaction chemistry of solution-phase transition-metal based systems with simple hydrocarbons and with more complex organic molecules. More than 20 internationally leading research groups contributed to this volume, and their chapters cover such topics as fundamental theoretical and mechanistic studies of C-H bond activation by metal complexes, catalytic systems for alkane functionalization, and new applications in synthetic organic chemistry. An introductory chapter offers an overview of stoichiometric and catalytic reactions of C-H bonds with transition metal complexes. The C-H bond is the most widespread linkage in organic chemistry, present in virtually every organic molecule. Unfortunately, C-H bonds are famously resistant to selective chemical transformations. The development of methods for their selective transformations has enormous potential value in fields ranging from the chemistry of fuels (for example, the conversion of methane to methanol) to the synthesis of the most complex organic molecules.
Download or read book Organic Synthesis written by Belakatte Parameshwarappa Nandeshwarappa and published by BoD – Books on Demand. This book was released on 2020-05-27 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book ‘Organic Synthesis - A Nascent Relook’ is a compendium of the recent progress in all aspects of organic chemistry including bioorganic chemistry, organo-metallic chemistry, asymmetric synthesis, heterocyclic chemistry, natural product chemistry, catalytic, green chemistry and medicinal chemistry, polymer chemistry, as well as analytical methods in organic chemistry. The book presents the latest developments in these fields. The chapters are written by chosen experts who are internationally known for their eminent research contributions. Organic synthesis is the complete chemical synthesis of a target molecule. In this book, special emphasis is given to the synthesis of various bioactive heterocycles. Careful selection of various topics in this book will serve the rightful purpose for the chemistry community and the industrial houses at all levels.
Download or read book Catalyst Separation Recovery and Recycling written by David J. Cole-Hamilton and published by Springer Science & Business Media. This book was released on 2006-01-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book looks at new ways of tackling the problem of separating reaction products from homogeneous catalytic solutions. The new processes involve low leaching supported catalysts, soluble supports such as polymers and dendrimers and unusual solvents such as water, fluorinated organics, ionic liquids and supercritical fluids. The advantages of the different possibilities are discussed alongside suggestions for further research that will be required for commercialisation. Unlike other books, in addition to the chemistry involved, the book looks at the process design that would be required to bring the new approaches to fruition. Comparisons are given with existing processes that have already been successfully applied and examples are given where these approaches are not suitable. The book includes: - New processes for the separation of products from solutions containing homogeneous catalysts - Catalysts on insoluble or soluble supports – fixed bed catalysts - continuous flow or ultrafiltration - Biphasic systems: water - organic, fluorous - organic, ionic liquid – organic, supercritical fluids (monophasic or biphasic with water, organic or ionic liquid) - Comparisons with current processes involving atmospheric or low temperature distillation - Consideration of Chemistry and Process Design - Advantages and disadvantages of each process exposed - Consideration of what else is need for commercialisation
Download or read book Carbon Dioxide as Chemical Feedstock written by Michele Aresta and published by John Wiley & Sons. This book was released on 2010-01-26 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the need for an up-to-date handbook, this ready reference closely investigates the use of CO2 for ureas, enzymes, carbamates, and isocyanates, as well as its use as a solvent, in electrochemistry, biomass utilization and much more. Edited by an internationally renowned and experienced researcher, this is a comprehensive source for every synthetic chemist in academia and industry.
Download or read book Rhodium Catalysis in Organic Synthesis written by Ken Tanaka and published by John Wiley & Sons. This book was released on 2019-05-06 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential reference to the highly effective reactions applied to modern organic synthesis Rhodium complexes are one of the most important transition metals for organic synthesis due to their ability to catalyze a variety of useful transformations. Rhodium Catalysis in Organic Synthesis explores the most recent progress and new developments in the field of catalytic cyclization reactions using rhodium(I) complexes and catalytic carbon-hydrogen bond activation reactions using rhodium(II) and rhodium(III) complexes. Edited by a noted expert in the field with contributions from a panel of leading international scientists, Rhodium Catalysis in Organic Synthesis presents the essential information in one comprehensive volume. Designed to be an accessible resource, the book is arranged by different reaction types. All the chapters provide insight into each transformation and include information on the history, selectivity, scope, mechanism, and application. In addition, the chapters offer a summary and outlook of each transformation. This important resource: -Offers a comprehensive review of how rhodium complexes catalyze a variety of highly useful reactions for organic synthesis (e.g. coupling reactions, CH-bond functionalization, hydroformylation, cyclization reactions and others) -Includes information on the most recent developments that contain a range of new, efficient, elegant, reliable and useful reactions -Presents a volume edited by one of the international leading scientists working in the field today -Contains the information that can be applied by researchers in academia and also professionals in pharmaceutical, agrochemical and fine chemical companies Written for academics and synthetic chemists working with organometallics, Rhodium Catalysis in Organic Synthesis contains the most recent information available on the developments and applications in the field of catalytic cyclization reactions using rhodium complexes.
Download or read book Catalytic Asymmetric Synthesis written by Takahiko Akiyama and published by John Wiley & Sons. This book was released on 2022-05-27 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalytic Asymmetric Synthesis Seminal text presenting detailed accounts of the most important catalytic asymmetric reactions known today This book covers the preparation of enantiomerically pure or enriched chemical compounds by use of chiral catalyst molecules. While reviewing the most important catalytic methods for asymmetric organic synthesis, this book highlights the most important and recent developments in catalytic asymmetric synthesis. Edited by two well-qualified experts, sample topics covered in the work include: Metal catalysis, organocatalysis, photoredox catalysis, enzyme catalysis C–H bond functionalization reactions Carbon–carbon bond formation reactions, carbon–halogen bond formation reactions, hydrogenations, polymerizations, flow reactions Axially chiral compounds Retaining the best of its predecessors but now thoroughly up to date with the important and recent developments in catalytic asymmetric synthesis, the 4th edition of Catalytic Asymmetric Synthesis serves as an excellent desktop reference and text for researchers and students, from upper-level undergraduates all the way to experienced professionals in industry or academia.
