Download or read book Metal Complexes with Bifunctional Imidazolyl Phosphines for Catalytic Organic Transformations written by and published by . This book was released on 2012 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research covered in this thesis involves studying and understanding the behavior of bifunctional ligands, specifically imidazolylphoshines. The major field of study is reaction of cyclopentadienyl ruthenium complexes with olefins, namely alkene isomerization. In these complexes, the basic nitrogen of the imidazolylphosphine is thought to deprotonate coordinated alkene intermediates reversibly, facilitating isomerization of terminal alkenes to yield internal alkenes selectively. The CpRu alkene isomerization catalyst is capable of moving double bonds as far as 30 positions; further mechanistic studies in presence of deuterium labeling as a tool, has led to development of hydrogen deuterium exchange of olefins at allylic positions. This finding supports the proposed mechanism and provides and outstanding deuteration at positions accessible by isomerization. The alkene isomerization catalyst can be used in a two-phase setting where the catalyst is dissolved in the organic layer and the non-toxic, non-flammable isotopic source (D2O) is immiscible with the organic layer. Using biphasic settings one can literally wash out reactive protons on the substrate without using organic solvents. In order to control high activity of alkene isomerization catalyst in absence of steric bulk provided by the substrate, bulkier phosphine ligands were synthesized and the activity of their metal complexes toward linear olefins was investigated. As a result, a family of catalysts that is capable of isomerizing unsubstituted linear alkenes to various mixtures have been established, where one can choose a complex to fit the needs of the process at hand. Further investigation with terminal alkenes bearing functional groups can be carried out to investigate whether mono-isomerization will still be the major transformation taking place, which is expected to give access to high-value 2-alkenes. To provide easy product-catalyst separation and potential wider application, the first syntheses of polymer-supported imidazolylphophines were developed, and the alkene isomerization catalyst was thus immobilized on polystyrene-based Merrifield resin. Compared to the homogeneous catalyst, the immobilized catalysts give the same high (E)-selectivity and conversion in isomerizations of terminal olefins to internal olefins with very low metal leaching from the insoluble support. Furthermore, use of organic solvents can be excluded and isomerization can be carried out in neat liquid organic substrates.
Download or read book Development of Bifunctional Phosphines Metal Complexes and Catalysts for Various Organic Transformations written by and published by . This book was released on 2011 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of phosphines with different heterocycles (pyridine and imidazole) possessing different substituents (alkyl and aryl) were synthesized. The phosphine ligands were reacted with different metal precursors to from organometallic complexes which were applied to catalysis. This dissertation describes, part of the discovery process of a uniquely active and selective catalyst for alkene isomerization and the importance of heterocyclic ring in the ligand, enhancing the acceleration of the reaction to almost 11,000 times faster than a non-heterocyclic analog. Further investigation of the isomerization catalyst, as a catalyst for cycloisomerization of alkynols led to discovery of the fact that a related alkyne hydration catalyst, reported by Dan Lev in 2004, was broadly useful in cycloisomerization reactions leading to synthesis of both indoles and benzofurans. A series of allylpalladium(II) chloride bifunctional phosphine complexes were also synthesized and characterized and eventually applied as catalysts for aryl amination reactions. Finally, two mechanistically distinct approaches to anti-Markovnikov alkene hydration using bifunctional ligands are described, which show promise for further development.
Download or read book Design Synthesis and Performance of Novel Bifunctional Transition Metal Complexes for Organic Reactions written by Braden Eric Silva and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: CHAPTER 1. This chapter introduces the field of study and motivations steering the direction of development. The topics of catalysis and bifunctional catalysis are discussed. CHAPTER 2. This chapter describes the development of biaryl phosphines containing functionalization with a pendent base for use in gold catalyzed organic reactions. This chapter starts with development of synthetic methods for high efficiency in the synthesis of new iterations on the chemical structure. The use of high throughput screening for reaction discovery is discussed and the result from our trials is discussed. Evaluation of the different ligand candidates is done through NMR spectroscopic studies on two reactions. The first reaction studied is carboxylic acid addition to terminal alkynes. The second reaction studied is isomerization of alkynes. CHAPTER 3. This chapter describes the synthesis of hydrogen-bond-donor-functionalized ferrocenyl bisphosphines, and studies on the coordination chemistry of the novel bisphosphines with platinum and nickel. Development of the synthetic route to yielding the target compounds was necessary, and the major points of concern are discussed. Studies on the coordination chemistry of the ferrocenyl bisphosphines with platinum and nickel are discussed
Download or read book Pincer Metal Complexes written by Akshai Kumar and published by Elsevier. This book was released on 2021-11-11 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pincer-Metal Complexes: Applications in Catalytic Dehydrogenation Chemistry provides an overview of pincer-metal catalytic systems that transform hydrocarbons and their derivatives from an synthetic and mechanistic point-of-view. This book provides thorough coverage of the operating mechanisms and dehydrogenation catalyst compatibility in both functionalized and unfunctionalized hydrocarbon systems. In addition, it includes success stories of pincer-metal systems, as well as current and future challenges. The book is an ideal reference for researchers practicing synthetic organic chemistry, inorganic chemistry, organometallic chemistry and catalysis in academia and industry. In recent years there has been a surge in the research on hydrocarbon dehydrogenation catalytic systems that are compatible with polar substituents. This helps facilitate formulation of tandem processes that are not limited to hydrocarbon transformation but also to hydrocarbon functionalization in a single pot. Covers applications of pincer-metal complexes in organic transformations Includes pincer-group 8 and 9 metal complexes for alkane dehydrogenations Features a discussion of pincer-metal complexes for the dehydrogenation of functionalized hydrocarbons and electro-catalytic transformations
Download or read book Catalysis by Metal Complexes and Nanomaterials written by Meng Zhou (Chemistry professor) and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Catalysis is truly an interdisciplinary field to which chemists, biologists, physicists, and engineers have made seminal contributions. This book aims to address the notably diverse topic of transition-metal catalysis in a single volume. The first half of the book is dedicated to the discrete and atomically precise metal complexes for homogeneous catalysis. Bimetallic, organometallic, and coordination complexes of early, late, and post-transition metals are described. Catalytic hydrogenation, oxidation, and coupling reactions are presented. The second half of the book focuses on three distinct types of nanomaterials: (1) zero- valent metallic nanoparticles, (2) titanium dioxide semiconductors, and (3) the porous coordination polymer known as the metal-organic framework. The chapters illustrate how deeply catalysis is influenced by other disciplines (e.g., coordination chemistry, bioinorganic chemistry, organometallic chemistry, computational chemistry, organic synthesis, photochemistry, materials science, environmental chemistry, green chemistry, and renewable energy). Advancements in these areas fuel the rapid growth of catalysis science. This book allows readers to reach a high-level of understanding in catalysis by learning from the perspectives of active practitioners. Unlike a textbook that provides a systematic, comprehensive, and historical education on the general topics of catalysis, this book offers critical case studies on select topics. Substantial emphasis is placed on the structural and fundamental properties that dictate catalyst performance, enabling readers to quickly understand and apply knowledge from cutting-edge studies and applications detailed within. This book can be utilized as a handbook, a textbook or textbook supplement, or a reference to guide future work"--
Download or read book Novel Metal Complexes of Bifunctional Imidazolyl substituted N heterocyclic Carbenes and Catalytic Applications written by Hai Ngan Tran and published by . This book was released on 2011 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bifunctional organometallic catalysts offer unique opportunities for new and improved reactivity and selectivity. The combination of a metal's d electrons and a pendant base or acid in the vicinity of an organometallic active site leads to substantial improvement of reaction rate in many key reactions. Here we report a synthesis of the first example of an imidazol-2-yl substituted bifunctional N-heterocyclic carbene ligand (NHC) and its coordination to a variety of metals. The metal complexes have been characterized by IR, NMR, and X-ray crystallography. The catalytic activity of these new NHC-metal complexes in hydrogenation reactions (e.g. Oppenauer-type alcohol oxidation, ß-alkylation of secondary alcohols with primary alcohols, N-alkylation of amines with alcohols), hydroamination, and azide-alkyne cycloaddition reactions is described.
Download or read book Scorpionates The Coordination Chemistry Of Polypyrazolylborate Ligands written by Swiatoslaw Trofimenko and published by World Scientific. This book was released on 1999-08-16 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with polypyrazolylborates (scorpionates), a class of ligands known since 1966, but becoming rapidly popular with inorganic, organometallic and coordination chemists since 1986, because of their versatility and user-friendliness. They can be readily modified sterically and electronically through appropriate substitution on the pyrazole ring and on boron, and have led to a number of firsts in coordination chemistry (first stable CuCO complex, first monomeric MgR complex, and many other such firsts). Their denticity can range from two to four, their “Bite” can be adjusted, and additional coordinating sites can be added to the pyrazolyl rings. Over 170 different scorpionate ligands are known today, and some are published for the first time in this book.The author, Swiatoslaw Trofimenko, discovered and developed this ligand system and has written several reviews on the subject. The book is intended as a reference work, placing at the researcher's command practically all of the over 1500 references on the subject up, and into 1999, organized both according to the ligand type and according to the metal or metalloid being coordinated. It acquaints the reader with the special features of this ligand system and permits an assessment of what has been done in a given sub-area, and of which areas remain relatively unexplored. It presents procedures for ligand synthesis, and also covers their use in catalysis and in the modelling of biologically active substances.
Download or read book Macromolecule Metal Complexes written by Francesco Ciardelli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first concise overview on the topic, spanning the spectrum from fundamentals to new application areas. The synthesis, kinetics and thermodynamics of these complexes are covered in detail, while much emphasis is placed on special properties such as gas transport, charge transport, catalysis and light-induced processes. Furthermore, the authors treat the actual working areas for new application methods. In all, a very helpful tool for polymer and materials scientists, as well as organic and physical chemists working in these fields.
Download or read book N4 Macrocyclic Metal Complexes written by J.H. Zagal and published by Springer Science & Business Media. This book was released on 2007-07-16 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to significant developments in sensor science and technology, this book offers insight into the various extended applications and developments of N4 macrocycle complexes in biomimetic electrocatalysis. Chapters are devoted to the chemistry, electronic and electrochemical properties of porphyrin- based polymetallated supramolecular redox catalysts and their applications in analytical and photoelectrochemical molecular devices; the use of porphyrins, phthalocyanines and related complexes as electrocatalysts for the detection of a wide variety of environmentally polluting and biologically relevant molecules; and the use of electropolymerized metalloporphyrin and metallophthalocyanine films as powerful materials for analytical tools, especially for sensing biologically relevant species.
Download or read book Water soluble Metal Complexes as Catalysts for Organic Transformations written by I. Thomas and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metallocenes in Regio and Stereoselective Synthesis written by Tamotsu Takahashi and published by Springer Science & Business Media. This book was released on 2005-01-12 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallocene is a well known sandwich complex with two cyclopentadienyl ligands such as ferrocene. Recently, such metallocene compounds have been found to be very characteristic and they have become very important, not only in the area of organic synthesis, but also in polymerization in industry. Metal complexes with one cyclopentadienyl ligand have also become popular as half sandwich complexes. The number of researchers in the field of metallocenes has increased rapidly. However, the origin of the characteristic reactivity of metallocenes is not fully understood. In this volume, the chemistry of metal complexes with at least one cyclopentadienyl ligand is comprehensively covered by leading experts. Reactions discussed here are (i) natural product synthesis, (ii) catalytic asymmetric synthesis, (iii) cyclization reactions, (iv)catalytic reactions, (iv) polymerization reactions and (v) carbon-carbon bond cleavage reactions. The reader will have access to useful information about the current state of metallocene chemistry.
Download or read book Chiral Transition Metal Complexes Containing Phosphines written by Darlene Grace D'Alliessi and published by . This book was released on 2003 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalysis of Organic Reactions written by Jr. Sowa and published by CRC Press. This book was released on 2005-03-30 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume compiles 63 peer-reviewed scientific papers documenting the latest developments in the application of homogeneous, heterogeneous, and immobilized homogenous catalysts used in organic synthesis. Catalysis of Organic Reactions consists of primary research articles accompanied by experimental sections that emphasize chemical processes with
Download or read book Direct Synthesis of Metal Complexes written by B.I. Kharisov and published by Elsevier. This book was released on 2018-04-19 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Synthesis of Metal Complexes provides in-depth coverage of the direct synthesis of coordination and organometallic compounds. The work is primarily organized by methods, but also covers highly relevant complexes, such as metal-polymer coordination compounds. This updated reference discusses recent developments in cryosynthesis, electrosynthesis, and tribosynthesis (popular as it doesn’t require organic solvents), with special attention paid to ‘greener’ methodologies and approaches. Additionally, the book describes physical methods of zero-valent metal interaction with organic matter, including sputtering, ultrasonic treatment and synthesis in ionic liquids. The book presents completely new content as a follow-up to the 1999 Elsevier Science publication Direct Synthesis of Coordination and Organometallic Compounds that was edited by Dr. Garnovskii and Dr. Kharisov. Covers current methods and techniques of metal interactions with organic media leading to metal chelates, adducts, di- and polymetallic complexes, metal-containing macrocycles, supported coordination compounds (i.e., metal complexes on carbon nanotubes), and more Describes reactivities of distinct forms of elemental metals (powders, sheets, nanoparticles (including a host of less-common metal nanostructures) with organic phase (liquid, solid and gaseous) and water Includes experimental procedures, with examples of direct synthesis, at the end of each chapter
Download or read book Transition Metal Carbyne Complexes written by F.R. Kreißl and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of transition metal carbyne complexes has become a highly attractive field during the past twenty years. In recent years its application to aspects of catalysis and metathesis has gained considerable interest from inorganic as well as organic chemists. In addition, organic synthesis by means of metal carbon multiple bond reagents offers the most sophisticated technology currently available. In consideration of these developments some of Professor E. O. Fischer's former coworkers and colleagues felt obliged to orga nize this NATO Advanced Research Workshop on Transition Metal Carbyne Complexes in the Bavarian Alps. They have been encouraged by the fact that most of the distinguished scientists in the field of metal-carbon multiple bond chemistry had finally agreed to participate and to present stimulating lectures. The organizers of the workshop are deeply grateful to the Scientific Affairs Division of the NATO for the generous financial support of the meeting in Wildbad Kreuth and for the preparation of this book. They also feel indebted to acknowledge the generous support from Wacker-Chemie, BASF, Peroxid-Chemie, Hoechst and Bayer. Finally they thank the staff of the Hanns-Seidel-Stiftung in Wildbad Kreuth for providing a pleasant and stimu lating atmosphere during the meeting.
Download or read book Organic Transformations Mediated by Group 4 Metal Complexes written by Kenneth Jay Barr and published by . This book was released on 1993 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Copper I Chemistry of Phosphines Functionalized Phosphines and Phosphorus Heterocycles written by Maravanji S. Balakrishna and published by Elsevier. This book was released on 2019-04-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Copper(I) Complexes of Phosphines, Functionalized Phosphines and Phosphorus Heterocycles is a comprehensive guide to one of the most widely used and extensively studied metals: copper. The numerous practical applications of copper compounds are discussed, including homogeneous and heterogeneous catalysis and their use as fungicides, pesticides, pigments for paints, resins and glasses, and in high-temperature superconductors. The remarkable structural flexibility of simple copper(I) complexes, such as cuprous halides is covered, including numerous structural motifs that, when combined with different ligand systems, exhibit linear, trigonal planar or tetrahedral geometries. This work is an essential reference for inorganic and coordination chemists, as well as researchers working on catalysis, anticancer reagents, luminescence, fluorescence and photophysical aspects.
