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Design Synthesis And Characterization Of Chiral Ccc Nhc Transition Metal Complexes And Catalytic Activity
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Book Synopsis Design, Synthesis and Characterization of Chiral CCC-NHC Transition Metal Complexes and Catalytic Activity by : Gopalakrishna Akurathi
Download or read book Design, Synthesis and Characterization of Chiral CCC-NHC Transition Metal Complexes and Catalytic Activity written by Gopalakrishna Akurathi and published by . This book was released on 2016 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first stable "free" N-heterocyclic carbene (NHC) was isolated in 1991, since then many classes of NHCs were synthesized and isolated. N-heterocyclic carbene ligands have become a common ligand in the synthesis of metal complexes, due to their strong [Sigma]-donation with poor [pi]-acceptor ability. Among all the NHC metal complexes, Hollis group was interested in exploring CCC-NHC pincer complexes. In 2005, Hollis and co-workers synthesized and isolated first achiral CCC-NHC zirconium pincer amido complex and studied its catalytic ability to perform intramolecular hydroamination of aminoalkenes. Later, Hollis group designed and developed new NHCs with a saturated chiral backbone, and used these new ligands to generate a new series of metal complexes. This dissertation is focused on the design, synthesis and characterization of several chiral bi-dentate NHC ligands with varying substituents on the backbone. These NHC ligands were used to synthesize several chiral mono, bis and tris amido CCC-NHC zirconium pincer complexes. Further, transmetallation to cobalt complexes were achieved. Intramolecular hydroamination was measured for several chiral bis and tris amido CCC-NHC pincer zirconium catalysts. Variants of these catalytic systems were generated with differing steric hinderance and electronic structure. The enantioselectivity of these novel new molecules were studied.
Book Synopsis N-Heterocyclic Carbenes in Transition Metal Catalysis by : Frank Glorius
Download or read book N-Heterocyclic Carbenes in Transition Metal Catalysis written by Frank Glorius and published by Springer. This book was released on 2007-02-05 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book leading experts have surveyed major areas of application of NHC metal complexes in catalysis. The authors have placed a special focus on nickel- and palladium-catalyzed reactions, on applications in metathesis reactions, on oxidation reactions and on the use of chiral NHC-based catalysts. This compilation is rounded out by an introductory chapter and a chapter dealing with synthetic routes to NHC metal complexes.
Book Synopsis Chiral Ferrocenes in Asymmetric Catalysis by : Li-Xin Dai
Download or read book Chiral Ferrocenes in Asymmetric Catalysis written by Li-Xin Dai and published by John Wiley & Sons. This book was released on 2010-02-01 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book meets the long-felt need for a reference on ferrocenes with the focus on catalysis. It provides a thorough overview of the synthesis and characterization of different types of chiral ferrocene ligands, their application to various catalytic asymmetric reactions, and versatile chiral materials as well as drug intermediates synthesized from them. Written by the "who's who" of ferrocene catalysis, this is a guide to the design of new ferrocene ligands and synthesis of chiral synthetic intermediates, and will thus be useful for organic, catalytic and synthetic chemists working in academia, industrial research or process development.
Book Synopsis Synthesis and Characterization of a CCC-NHC Manganese Complex and Its Catalytic Activity in Alpha-alkylation Reactions of Ketones Using Alcohols – Acceptorless Dehydrogenative Coupling Reaction by : Thi Bao Tran Nguyen
Download or read book Synthesis and Characterization of a CCC-NHC Manganese Complex and Its Catalytic Activity in Alpha-alkylation Reactions of Ketones Using Alcohols – Acceptorless Dehydrogenative Coupling Reaction written by Thi Bao Tran Nguyen and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: N-heterocyclic carbenes are essential for the synthesis and stabilization of various metal complexes due to the tendency to act as sigma-donor of sp2 hybridized lone pair in carbene into sigma-accepting orbital of metals. Meanwhile, the electronic and steric properties of pincer complexes can be fine-tuned by modifying three sites bonded to the metals. Utilizing advantages of both NHCs and the pincer structures, NHCs-based pincer complexes have become increasingly developed in recent years. After the discovery of zirconium and rhodium complexes with CCC-NHC backbones reported in 2005, Hollis’s group has been interested in applying the CCC-NHC pincer precursor for other transition metals. Manganese, the third most abundant transition metal in the earth’s crust, has lower cost and less toxic features compared to most of the others. Herein, the CCC-NHCs manganese pincer complex is synthesized and characterized and its catalytic activity in alpha- alkylation reaction of ketones using alcohols was studied.
Book Synopsis N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis by : Catherine S.J. Cazin
Download or read book N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis written by Catherine S.J. Cazin and published by Springer Science & Business Media. This book was released on 2010-10-04 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis features all catalytic reactions enabled by N-heterocyclic carbenes (NHCs), either directly as organocatalysts or as ligands for transition metal catalysts. An explosion in the use of NHCs has been reported in the literature during the past seven years making this comprehensive overview highly apropos. The book begins with an introductory overview of NHCs which could have been subtitled all you need to know about NHCs. The main body of the book is dedicated to applications of NHCs in catalysis. In addition to the success stories of NHCs in metathesis, NHCs in cross coupling and more recently NHCs in organocatalysis, all other less publicized areas are also covered. As the success of NHCs is generally attributed to their potential to stabilize metal centres, the inclusion of a chapter on the decomposition of NHC catalysts is pertinent. The book closes with a chapter describing the applications of NHCs in industrial processes, which is the first coverage of its kind, and brings a unique industrial context to this book. Included in this book: Historical aspects of NHCs Synthetic pathways to NHC precursors, free NHCs and complexes Methods of characterisation of NHCs and related complexes Electronic properties of NHCs Steric properties of NHCs and models for their description NHCs for metathesis and cross-coupling reactions NHCs as organocatalysts NHC Transition-Metal mediated oxidations, additions to multiple bonds, polymerisation and oligomerisation, cyclisations, direct arylations, reactions involving CO, C-F and C-H bond activation, ... Decomposition of NHC-containing catalysts Industrial applications involving NHC-containing catalysts N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis provides a fresh view of NHCs since most contributors are young emerging researchers in the field of homogeneous catalysis using NHCs. This group of contributors is complemented by highly established academic researchers and an industrialist. This book is comprehensive, from the basic features of NHCs to the latest advances, hence it is suitable for both the novice and the expert.
Book Synopsis Pincer Compounds by : David Morales-Morales
Download or read book Pincer Compounds written by David Morales-Morales and published by Elsevier. This book was released on 2018-04-11 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pincer Compounds: Chemistry and Applications offers valuable state-of-the-art coverage highlighting highly active areas of research—from mechanistic work to synthesis and characterization. The book focuses on small molecule activation chemistry (particularly H2 and hydrogenation), earth abundant metals (such as Fe), actinides, carbene-pincers, chiral catalysis, and alternative solvent usage. The book covers the current state of the field, featuring chapters from renowned contributors, covering four continents and ranging from still-active pioneers to new names emerging as creative strong contributors to this fascinating and promising area. Over a decade since the publication of Morales-Morales and Jensen’s The Chemistry of Pincer Compounds (Elsevier 2007), research in this unique area has flourished, finding a plethora of applications in almost every single branch of chemistry—from their traditional application as very robust and active catalysts all the way to potential biological and pharmaceutical applications. Describes the chemistry and applications of this important class of organometallic and coordination compounds Includes contributions from global leaders in the field, featuring pioneers in the area as well as emerging experts conducting exciting research on pincer complexes Highlights areas of promising and active research, including small molecule activation, earth abundant metals, and actinide chemistry
Book Synopsis The Method Development for Synthesizing Chiral CCC-NHC Zr Pincer Complexes by : Amarraj Chakraborty
Download or read book The Method Development for Synthesizing Chiral CCC-NHC Zr Pincer Complexes written by Amarraj Chakraborty and published by . This book was released on 2015 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are numerous classes of N-heterocyclic carbenes (NHCs) that have been synthesized since the discovery of stable NHCs in 1988. Their application as ligands in metal complexes has received much attention because of their strong sigma-donor and poor pi-acceptor properties. Within these NHC metal complexes, we are interested in studying zirconium metal complexes with pincer NHC ligands. Recently, achiral CCC-NHC pincer zirconium complexes were synthesized and their catalytic activity in intramolecular hydroamination of aminoalkenes were reported. Herein is reported new reaction conditions which yield pure, chiral CCC-NHC Zr pincer mono(amido) dibromo complex. The enantiopure crystal structure of the same complex is reported. Attempts to synthesize chiral CCC-NHC Zr pincer bis- and tris- amido complexes with the iodo salt of the ligand precursor are summarized. Moreover, syntheses of chiral bis(imidazolinium) ligand precursors with different counter anions are reported with optimized reaction conditions.
Book Synopsis Synthesis and Catalytic Activity of CCC-NHC Group 9 Metal Pincer Complexes by : Sean William Reilly
Download or read book Synthesis and Catalytic Activity of CCC-NHC Group 9 Metal Pincer Complexes written by Sean William Reilly and published by . This book was released on 2015 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: N-Heterocyclic carbenes (NHCs) are one of the few ligand systems that can finely tune transition metal catalysts via sterics and electronics. The strong sigma-donating properties of these ancillary ligands allow the development of robust tridentate NHC pincer framework, which has emerged as an alternative to the phosphine pincer ligands. The combination of NHC and pincer systems has resulted in a new generation of catalytically active organometallic complexes reported throughout the literature. CCC-NHC Rh pincer complexes were found to be catalytically active in C-C and C-B bond formation via 1,4-addition reactions. In addition, the in-situ generated CCC-NHC Ir(H) pincer complex demonstrated catalytic activity in borylation of arene C-H bonds. Preliminary results are comparable to the C-H borylation results published by Hartwig and co-workers. The CCC-NHC Ir(H) pincer complex may also prove to be a suitable catalyst for alkane dehydrogenation, due to framework similarities of the highly active and durable PCP and POCOP pincer hydride systems. Expansion of group 9 metal sources for transmetalation of the CCC-NHC Zr pincer complex afforded the development of CCC-NHC Rh(CO) and CCC-NHC Co complexes. Group 9 metal carbonyl complexes have been reported as active catalysts in photocatalytic C-H activation of small molecules. Testing of Co sources for transmetalation afforded three rare Co pincer complexes, and the first examples of CCC-NHC Co pincer complexes to date. Development of CCC-NHC pincer complexes with base metals provide cost-effect alternatives to pincer systems with precious metal centers, and is reported herein.
Book Synopsis Design, Synthesis, and Characterization of Transition Metal Oxide Based Functional Materials for Multi-phase Catalytic Applications by : Chung-Hao Kuo
Download or read book Design, Synthesis, and Characterization of Transition Metal Oxide Based Functional Materials for Multi-phase Catalytic Applications written by Chung-Hao Kuo and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetically Controlled Stepwise Syntheses of a Heterometallic Complex and a Tetrahedral Chiral-at-Metal Complex by : Kenichi Endo
Download or read book Kinetically Controlled Stepwise Syntheses of a Heterometallic Complex and a Tetrahedral Chiral-at-Metal Complex written by Kenichi Endo and published by Springer. This book was released on 2022-04-02 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes novel synthetic methodologies for two kinds of structurally elaborate metal complexes: a heterometallic complex and a tetrahedral chiral-at-metal complex. The book provides the tools and inspiration to chemists for development of metal complexes with wide structural diversity than had previously been possible. For each of the two topics, existing synthetic methods for similar compounds are discussed first, and then new strategies are presented, followed by the demonstration of the synthesis of novel compounds supported by experimental results. Both of the final products in this research, a Co–Ni heterometallic complex covered in the first topic and a tetrahedral chiral-at-metal complex in the second one are difficult to obtain by using common synthetic methods for thermodynamic reasons. This research achieved highly selective syntheses of these compounds using newly designed strategies that enable precise kinetic control. Such an approach will be useful for synthesizing other new metal complexes. Since the last century, organic chemistry has flourished with the development of a variety of synthetic techniques that make precise kinetic control possible. Coordination chemistry of 3d or main-group transition metals has been mainly based on simple one-step reactions that yield only thermodynamic products. The publication of this book helps pave the way to kinetically controlled precise syntheses of various metal complexes.
Book Synopsis Design, Synthesis and Catalytic Properties of Chiral Counteranions on Transition Metal Catalysts by : David B. Llewellyn
Download or read book Design, Synthesis and Catalytic Properties of Chiral Counteranions on Transition Metal Catalysts written by David B. Llewellyn and published by . This book was released on 2002 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The design of enantioselective transition metal catalyzed reactions is an important area of chemical research. The purpose of this study was to develop a new method to incorporate chirality into transition metal catalysis via ion pairing interactions. This has led to the development of the first enantioselective transition metal catalyzed reaction using a chiral counteranion as the sole source of asymmetry." --
Book Synopsis The Design, Synthesis and Application to Asymmetric Catalysis of Chiral Transition Metal Cyclopentadienyl Complexes by : Daniel Christopher Brookings
Download or read book The Design, Synthesis and Application to Asymmetric Catalysis of Chiral Transition Metal Cyclopentadienyl Complexes written by Daniel Christopher Brookings and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design, Synthesis and Applications of Tetradentate Transition Metal Complexes Towards Asymmetric Alkylations by :
Download or read book Design, Synthesis and Applications of Tetradentate Transition Metal Complexes Towards Asymmetric Alkylations written by and published by . This book was released on 2005 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlling the absolute stereochemistry of molecules is a major challenge to contemporary chemists. Achieving high enantioselectivity with catalytic amounts of a chirality transfer (or inducing) agent, and the ease of regenerating such catalysts is yet another challenge. Due to the involvement of various transition metal complexes, the relatively young field of enantioselective catalysis has emerged as a powerful tool for organic chemistry.
Book Synopsis Synthesis, Characterization, and Catalytic Reactivity of First-row Transition Metal CCC Pincer Complexes by : Bailey Jeanne Jackson
Download or read book Synthesis, Characterization, and Catalytic Reactivity of First-row Transition Metal CCC Pincer Complexes written by Bailey Jeanne Jackson and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organometallic Pincer Chemistry by : Gerard van Koten
Download or read book Organometallic Pincer Chemistry written by Gerard van Koten and published by Springer. This book was released on 2012-09-17 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gerard van Koten: The Mono-anionic ECE-Pincer Ligand - a Versatile Privileged Ligand Platform: General Considerations.- Elena Poverenov, David Milstein: Non-Innocent Behavior of PCP and PCN Pincer Ligands of Late Metal Complexes.- Dean M. Roddick: Tuning of PCP Pincer Ligand Electronic and Steric Properties.- Gemma R. Freeman, J. A. Gareth Williams: Metal Complexes of Pincer Ligands: Excited States, Photochemistry, and Luminescence.- Davit Zargarian, Annie Castonguay, Denis M. Spasyuk: ECE-Type Pincer Complexes of Nickel.- Roman Jambor and Libor Dostál: The Chemistry of Pincer Complexes of 13 - 15 Main Group Elements.- Kálmán J. Szabo: Pincer Complexes as Catalysts in Organic Chemistry.- Jun-ichi Ito and Hisao Nishiyama: Optically Active Bis(oxazolinyl)phenyl Metal Complexes as Multi-potent Catalysts.- Anthony St. John, Karen I. Goldberg, and D. Michael Heinekey: Pincer Complexes as Catalysts for Amine Borane Dehydrogenation.- Dmitri Gelman and Ronit Romm: PC(sp3)P Transition Metal Pincer Complexes: Properties and Catalytic Applications.- Jennifer Hawk and Steve Craig: Physical Applications of Pincer Complexes.
Book Synopsis The Chemistry of Pincer Compounds by : David Morales-Morales
Download or read book The Chemistry of Pincer Compounds written by David Morales-Morales and published by Elsevier. This book was released on 2011-08-11 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pincer complexes are formed by the binding of a chemical structure to a metal atom with at least one carbon-metal bond. Usually the metal atom has three bonds to a chemical backbone, enclosing the atom like a pincer. The resulting structure protects the metal atom and gives it unique properties.The last decade has witnessed the continuous growth in the development of pincer complexes. These species have passed from being curiosity compounds to chemical chameleons able to perform a wide variety of applications. Their unique metal bound structures provide some of the most active catalysts yet known for organic transformations involving the activation of bonds. The Chemistry of Pincer Compounds details use of pincer compounds including homogeneous catalysis, enantioselective organic transformations, the activation of strong bonds, the biological importance of pincer compounds as potential therapeutic or pharmaceutical agents, dendrimeric and supported materials. * Describes the chemistry and applications of this important class of organometallic and coordination compounds* Covers the areas in which pincer complexes have had an impact* Includes information on more recent and interesting pincer compounds not just those that are well-known
Book Synopsis N-heterocyclic Carbene Group 4 Metal Complexes by : Charles Romain
Download or read book N-heterocyclic Carbene Group 4 Metal Complexes written by Charles Romain and published by . This book was released on 2011 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of a novel NHC chelating ligand allowed the beneficial “association” of a soft NHC moiety with hard oxophilic group 4 metal which lead to the synthetize of a broad family of NHC group 4 metal complexes. Remarkably, the (OCO)MXX' group 4 chelates (X, X' = amido, alkoxide, chloride) were all found to be stable and robust entities with the NHC moiety truly and solely acting as an ancillary ligand under catalytic conditions. Attempts to access alkyl group 4 derivatives opened the way to an unprecedented NHC--involving alkyl/benzyl rearrangement reaction, there by constituting the first instance in which a NHC moiety coordinated to a high--oxidation--state and oxophilic transition metal NHC complex exhibited such a behavior. The prepared NHC group 4 metal alkoxide species were investigated in polymerization catalysis and found to be suitable initiators for the controlled and highly stereoselective ring--opening polymerization (ROP) of cyclic esters (lactide, a dimer of lactic acid) and cyclic carbonates (trimethylene carbonate), demonstrating the robustness of such species in catalytic conditions. These results constitute the first instance in which a NHC--based oxophilic metal catalyst is competitive and, to some extent, even performs better than current systems the area.
