Functionalised N-Heterocyclic Carbene Complexes

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Publisher : John Wiley & Sons
ISBN 13 : 0470685840
Total Pages : 364 pages
Book Rating : 4.4/5 (76 download)

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Book Synopsis Functionalised N-Heterocyclic Carbene Complexes by : Olaf Kühl

Download or read book Functionalised N-Heterocyclic Carbene Complexes written by Olaf Kühl and published by John Wiley & Sons. This book was released on 2010-02-02 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: N-heterocyclic carbenes (NHCs) have found increasing use as reagents for a range of organic transformations and in asymmetric organocatalysis. The performance of these molecules can be improved and tuned by functionalisation. Functionalised carbenes can anchor free carbenes to the metal site, introduce hemilability, provide a means to immobilise transition metal carbene catalysts, introduce chirality, provide a chelate ligand or bridge two metal centres. NHC can be attached to carbohydrates and campher, derived from amino acids and purines, they can be used as organocatalysts mimicking vitamin B1 or as weak “solvent” donors in lanthanide chemistry. Functionalised N-Heterocyclic Carbene Complexes describes major trends in functionalised NHC ligands, aiming to assist readers in their attempts to develop and apply their own functionalised carbenes. After an introduction to the chemistry and behaviour of NHC, the book gives a detailed description of functionalised carbenes and their complexes according to a range of functional groups, each with a discussion of the synthetic route, structure, stability and performance. Functionalised N-Heterocyclic Carbene Complexes is an essential guide to fine-tuning this important class of compounds for practitioners, researchers and advanced students working in synthetic organometallic and organic chemistry and catalysis.

Functionalised and Cyclometallated N-Heterocyclic Carbene Complexes of Pd, Ni, Rh and Ir

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Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Functionalised and Cyclometallated N-Heterocyclic Carbene Complexes of Pd, Ni, Rh and Ir by : Neoklis Stylianides

Download or read book Functionalised and Cyclometallated N-Heterocyclic Carbene Complexes of Pd, Ni, Rh and Ir written by Neoklis Stylianides and published by . This book was released on 2007 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Organometallic Pincer Chemistry

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Publisher : Springer
ISBN 13 : 3642310818
Total Pages : 363 pages
Book Rating : 4.6/5 (423 download)

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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.

Synthesis of Phosphine- and Pyridine- Functionalised N-heterocyclic Carbene Complexes of Platinum Group Metals

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Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Synthesis of Phosphine- and Pyridine- Functionalised N-heterocyclic Carbene Complexes of Platinum Group Metals by : Nikolaos Tsoureas

Download or read book Synthesis of Phosphine- and Pyridine- Functionalised N-heterocyclic Carbene Complexes of Platinum Group Metals written by Nikolaos Tsoureas and published by . This book was released on 2005 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Synthesis and Applications of O-functionalised N-heterocyclic Carbene Complexes of First-row Transition Metals

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis Synthesis and Applications of O-functionalised N-heterocyclic Carbene Complexes of First-row Transition Metals by : Simone Bertini

Download or read book Synthesis and Applications of O-functionalised N-heterocyclic Carbene Complexes of First-row Transition Metals written by Simone Bertini and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Organometallic Chemistry of N-heterocyclic Carbenes

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Publisher : John Wiley & Sons
ISBN 13 : 1118698800
Total Pages : 352 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis The Organometallic Chemistry of N-heterocyclic Carbenes by : Han Vinh Huynh

Download or read book The Organometallic Chemistry of N-heterocyclic Carbenes written by Han Vinh Huynh and published by John Wiley & Sons. This book was released on 2017-01-23 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Organometallic Chemistry of N-heterocyclic Carbenes describes various aspects of N-heterocyclic Carbenes (NHCs) and their transition metal complexes at an entry level suitable for advanced undergraduate students and above. The book starts with a historical overview on the quest for carbenes and their complexes. Subsequently, unique properties, reactivities and nomenclature of the four classical NHCs derived from imidazoline, imidazole, benzimidazole and 1,2,4-triazole are elaborated. General and historically relevant synthetic aspects for NHCs, their precursors and complexes are then explained. The book continues with coverage on the preparation and characteristics of selected NHC complexes containing the most common metals in this area, i.e. Ni, Pd, Pt, Ag, Cu, Au, Ru, Rh and Ir. The book concludes with an overview and outlook on the development of various non-classical NHCs beyond the four classical types. Topics covered include: Stabilization, dimerization and decomposition of NHCs Stereoelectronic properties of NHCs and their evaluation Diversity of NHCs Isomers of NHC complexes and their identification NMR spectroscopic signatures of NHC complexes normal, abnormal and mesoionic NHCs The Organometallic Chemistry of N-heterocyclic Carbenes is an essential resource for all students and researchers interested in this increasingly important and popular field of research.

Synthetic Approaches Towards Gold (I) and Silver (I) Complexes of Functionalised N-heterocyclic Carbene Ligands

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Publisher :
ISBN 13 :
Total Pages : 311 pages
Book Rating : 4.:/5 (92 download)

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Book Synopsis Synthetic Approaches Towards Gold (I) and Silver (I) Complexes of Functionalised N-heterocyclic Carbene Ligands by : James Laurence Hickey

Download or read book Synthetic Approaches Towards Gold (I) and Silver (I) Complexes of Functionalised N-heterocyclic Carbene Ligands written by James Laurence Hickey and published by . This book was released on 2008 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on the design and synthesis of Au(I) and Ag(I) complexes from ligand systems that aim to combine both N-heterocyclic carbene (NHC) and phosphine ligand types. A number of synthetic approaches towards both the ligands and the prepared metal complexes have been developed, with a concerted effort on achieving the desired Au(I) or Ag(I) complexes with minimal reaction steps and synthetic style. The thesis body is divided into two main sections. The first section addresses the preparation of suitable ligand precursors of potential Au(I) and Ag(I) complexes in the form of halo- and phosphino-functionalised imidazolium salts. Several series of haloalkylimidazolium salts were prepared that encompass a range of halogens (Cl, Br, I), alkyl substituents (Me, i-Pr, t-Bu, n-Bu), differing alkyl linker length (n = 0-3), and a variety of organic spacers employed to bridge multi-imidazolium moieties. Novel bidentate and multidentate phosphinoalkylimidazolium salts were synthesised from the various haloalkylimidazolium salts, via the substitution of a halide with nucleophilic diphenylphosphide. A new approach towards rare methylene bridged phosphinomethylimidazolium salts was achieved from the reactions of halomethylimidazolium salts with diphenylphosphine. The second section investigates the preparation of Au(I) and Ag(I) complexes from the halo- and phosphino-functionalised imidazolium salts. A series of dicationic 10, 12, and 14-membered metallacyclic Ag(I) complexes were prepared from the bidentate phosphinoalkylimidazolium salts. The dinuclear Ag(I) metallacycles combine two phosphino-functionalised NHC ligands that are bridged by two coordinated Ag(I) ions in an exclusively head-to-head arrangement. A dinuclear Ag(I) metallacycle was investigated for transmetallation potential to a Au(I) complex and found to selectively transmetallate at the Ag(I) coordinated to the NHC ligands to form a bimetallic metallacycle. Unexpected phosphine oxidation of a 10-membered dinuclear Ag(I) metallacycle resulted in complex disproportionation to an isolable and rare silver(I) trimer. Metal-NHC complexes from haloalkylimidazolium salts have not been reported previously, a novel approach to the synthesis of a series of Au(I) complexes from haloalkylimidazolium salts and a respective gold source was developed and is reported herein. Different synthetic approaches towards Au(I) complexes with the phosphinoalkylimidazolium salts explored a variety of ways to generate the NHC from an imidazolium in the presence of the phosphine. A one-pot, high yielding synthesis of a dinuclear Au(I) complex from PPh3 was also devised, with controlled assembly of the complex resulting in a similar head-to-head ligand arrangement to the dinuclear Ag(I) metallacycles. As an aside, a family of mononuclear [Au(R2NHC)2]+ complexes (R = Me, i-Pr, t- Bu, n-Bu, Cy) prepared previously in our research group, was expanded because of the promising antimitochondrial activity shown by [Au(i-Pr2NHC)2]+. Two new [Au(R2NHC)2]+ complexes with simple alkyl chain functionality were prepared with fine-tuned lipophilicity in close proximity to that of [Au(i-Pr2NHC)2]+.

The Mizoroki-Heck Reaction

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Author :
Publisher : John Wiley & Sons
ISBN 13 : 9780470716069
Total Pages : 608 pages
Book Rating : 4.7/5 (16 download)

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Book Synopsis The Mizoroki-Heck Reaction by : Martin Oestreich

Download or read book The Mizoroki-Heck Reaction written by Martin Oestreich and published by John Wiley & Sons. This book was released on 2009-02-11 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exploring the importance of Richard F. Heck’s carbon coupling reaction, this book highlights the subject of the 2010 Nobel Prize in Chemistry for palladium-catalyzed cross couplings in organic synthesis, and includes a foreword from Nobel Prize winner Richard F. Heck. The Mizoroki-Heck reaction is a palladium-catalyzed carbon–carbon bond forming process which is widely used in organic and organometallic synthesis. It has seen increasing use in the past decade as chemists look for strategies enabling the controlled construction of complex carbon skeletons. The Mizoroki-Heck Reaction is the first dedicated volume on this important reaction, including topics on: mechanisms of the Mizoroki-Heck reaction intermolecular Mizoroki-Heck reactions focus on regioselectivity and product outcome in organic synthesis waste-minimized Mizoroki-Heck reactions intramolecular Mizoroki-Heck reactions formation of heterocycles chelation-controlled Mizoroki-Heck reactions the Mizoroki-Heck reaction in domino processes oxidative heck-type reactions (Fujiwara-Moritani reactions) Mizoroki-Heck reactions with metals other than palladium ligand design for intermolecular asymmetric Mizoroki-Heck reactions intramolecular enantioselective Mizoroki-Heck reactions desymmetrizing Mizoroki-Heck reactions applications in combinatorial and solid phase syntheses, and the development of modern solvent systems and reaction techniques the asymmetric intramolecular Mizoroki-Heck reaction in natural product total synthesis Several chapters are devoted to asymmetric Heck reactions with particular focus on the construction of otherwise difficult-to-obtain sterically congested tertiary and quaternary carbons. Industrial and academic applications are highlighted in the final section. The Mizoroki-Heck Reaction will find a place on the bookshelves of any organic or organometallic chemist. “I am convinced that this book will rapidly become the most important reference text for research chemists in academia and industry who seek orientation in the rapidly growing and – for the layman – confusing field described as the “’Mizoroki–Heck reaction’.” (Synthesis, March 2010)

Synthesis and Reactivity of Metal Complexes Containing Functionalized N-heterocyclic Carbene Ligands for Catalytic Applications

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Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (952 download)

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Book Synopsis Synthesis and Reactivity of Metal Complexes Containing Functionalized N-heterocyclic Carbene Ligands for Catalytic Applications by : Pengfei Ai

Download or read book Synthesis and Reactivity of Metal Complexes Containing Functionalized N-heterocyclic Carbene Ligands for Catalytic Applications written by Pengfei Ai and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was the synthesis of N,N'-diphosphanyl-functionalized NHC ligands andtheir coordination chemistry. The novel stable and rigid tridentate N,N'-diphosphanyl-imidazol-2-ylidene was synthesized and experimental and computational information on its stability weregained. It served as a unique platform for the synthesis of novel mono-, di-, tri-, penta-, hexanuclear complexes with the coinage metals (Cu, Ag and Au), exhibiting rare structural features. The mono- and dinuclear complexes with one or two dangling P-donors provided rational access to heterotrinuclear complexes. All these coinage metal complexes have short metal-metalseparations, indicating the presence of d10-d10 interactions, and display excellent luminescentproperties. Partial or complete transmetallation of the homotrinuclear Cu or Ag complexes withPd(0) precursors led to hetero-trinuclear complexes with d10-d10 interactions. In addition to itsbridging behavior, this ligand also showed its chelating behavior in Pd or Cr(III) complexes. Thelatter displayed superior performance in ethylene oligomerization than the Cr(II) complexes andgave mostly oligomers.

Functionalized N-heterocyclic Carbene Complexes of Iridium and Ruthenium

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (954 download)

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Book Synopsis Functionalized N-heterocyclic Carbene Complexes of Iridium and Ruthenium by : Mario Johannes Bitzer

Download or read book Functionalized N-heterocyclic Carbene Complexes of Iridium and Ruthenium written by Mario Johannes Bitzer and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

N-Heterocyclic Carbenes in Transition Metal Catalysis and Organocatalysis

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Publisher : Springer Science & Business Media
ISBN 13 : 9048128668
Total Pages : 348 pages
Book Rating : 4.0/5 (481 download)

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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.

Light-Emitting Electrochemical Cells

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Publisher : Springer
ISBN 13 : 3319586130
Total Pages : 371 pages
Book Rating : 4.3/5 (195 download)

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Book Synopsis Light-Emitting Electrochemical Cells by : Rubén D. Costa

Download or read book Light-Emitting Electrochemical Cells written by Rubén D. Costa and published by Springer. This book was released on 2017-07-31 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the recent achievements towards the next generation of Light-emitting electrochemical cells (LEC). Its first part focus on the definition, history and mechanism of LEC, going then to concepts and challenges and, finally, giving the reader examples of current application of new electroluminescent materials. The chapters are written by different international groups working on LEC.

N-Heterocyclic Carbenes in Organocatalysis

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Publisher : John Wiley & Sons
ISBN 13 : 3527809058
Total Pages : 407 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis N-Heterocyclic Carbenes in Organocatalysis by : Akkattu T. Biju

Download or read book N-Heterocyclic Carbenes in Organocatalysis written by Akkattu T. Biju and published by John Wiley & Sons. This book was released on 2019-01-07 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizing the emerging field of N-heterocyclic carbenes used in organocatalysis, this is an excellent overview of the synthesis and applications of NHCs focusing on carbon-carbon and carbon-heteroatom bond formation. Alongside comprehensive coverage of the synthesis, characteristics and applications, this handbook and ready reference also includes chapters on NHCs for polymerization reactions and natural product synthesis.

Asymmetric Organocatalysis Combined with Metal Catalysis

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Publisher : Springer Nature
ISBN 13 : 3030438511
Total Pages : 211 pages
Book Rating : 4.0/5 (34 download)

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Book Synopsis Asymmetric Organocatalysis Combined with Metal Catalysis by : Bruce A. Arndtsen

Download or read book Asymmetric Organocatalysis Combined with Metal Catalysis written by Bruce A. Arndtsen and published by Springer Nature. This book was released on 2020-04-24 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience.Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.The chapter "Enamine/Transition Metal Combined Catalysis: Catalytic Transformations Involving Organometallic Electrophilic Intermediates" is available open access under a CC BY 4.0 License via link.springer.com.

N-Heterocyclic Carbenes

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Publisher : Royal Society of Chemistry
ISBN 13 : 1782626816
Total Pages : 637 pages
Book Rating : 4.7/5 (826 download)

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Book Synopsis N-Heterocyclic Carbenes by : Silvia Diez-Gonzalez

Download or read book N-Heterocyclic Carbenes written by Silvia Diez-Gonzalez and published by Royal Society of Chemistry. This book was released on 2016-11-04 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Synthesis, and Structural and Catalytic Investigation of N-heterocyclic Carbene Metal Complexes Derived from Electron-rich Alkoxybenzimidazolin-2-ylidenes

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (769 download)

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Book Synopsis Synthesis, and Structural and Catalytic Investigation of N-heterocyclic Carbene Metal Complexes Derived from Electron-rich Alkoxybenzimidazolin-2-ylidenes by : Peter Vernon Simpson

Download or read book Synthesis, and Structural and Catalytic Investigation of N-heterocyclic Carbene Metal Complexes Derived from Electron-rich Alkoxybenzimidazolin-2-ylidenes written by Peter Vernon Simpson and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an investigation into the synthesis, properties and application of a series of transition metal complexes bearing N-heterocyclic carbene ligands. There were four main areas of focus: the synthesis of alkoxy functionalised benzimidazolium salts and the assessment of their electron-donating abilities; the synthesis of transition metal complexes bearing electron-rich N-heterocyclic carbene ligands, and an investigation of their properties; an investigation into the catalytic activity of the palladium and rhodium complexes; and a preliminary study into the possibility of immobilising a palladium- NHC complex onto silica gel for use as a solid-supported heterogeneous catalyst. Various butoxy-functionalised benzimidazolium salts, including mono- (benzimidazolium) salts, bis(benzimidazolium) salts and benzimidazolium cyclophanes were prepared as precursors to electron rich NHC-metal complexes. Preparation of the (NHC)RhI(CO)2 complexes I - III and subsequent analysis by IR spectroscopy confirmed the increased electron richness of the butoxy-functionalised NHCs compared to the non-butoxy-functionalised analogues. Some of the benzimidazolium salts were used to prepare Ag(I)-NHC complexes for the purpose of transmetallation agents. Treatment of the Ag(I)-NHC complex IV with [RuCl2(p-cymene)]2 yielded the dinuclear cationic Ru(II)-NHC complex V, which exhibits !2-binding of the quaternary carbons of each xylyl ring to the Ru centre. This unique complex was also converted to the hexafluorophosphate complex in excellent yields. A range of Pd(II)-NHC complexes were synthesized. The complexes possessed mono(NHC), chelating bis(NHC) (bridged on one or both sides), and mixed NHC/ancillary ligand systems, in order to assess the most favourable structural characteristics of a potential catalyst. Reaction of the bis(benzimidazolium) salt VI with Pd(OAc)2 gave two complexes, VII and VIII, which were subsequently isolated. The unusual complex VII, in which the xylyl ring is folded under the metal centre, was found to isomerise to IX over approximately twenty-six days in CDCl3. The conformations of the xylyl ring in VII and IX was confirmed using selective NOESY experiments. Two trans-o-xylyl-linked Pd(II)-NHC complexes were prepared and characterised, and represent the only fully characterised complexes of this type. During efforts to synthesize the dinitrophenyl-functionalised bis(NHC)-Pd(II) complex X under strict anhydrous and anaerobic conditions, instead, the trinuclear Abstract v palladium complex XI was isolated, where one dinitrophenyl group of each ligand has been displaced, presumably by attack from adventitious water or acetate present in the reaction mixture. Pd N N N N Br. Many of the Pd(II)-NHC complexes were tested in an extensive set of experiments designed to provide an insight into favourable structural motifs for a potential catalyst and confirm the beneficial nature of the electron donating butoxy groups. It was found that the Pd(II)-NHC complexes possessing chelating bis(NHC) ligands were the most active in the Mizoroki-Heck and Suzuki-Miyaura cross-coupling reactions, possibly due to the robustness of these complexes at the temperatures necessary to promote the reactions. Gratifyingly, the complexes possessing butoxy groups were found to be more active than the non-butoxy-functionalised analogues.

The Chemistry of Pincer Compounds

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Author :
Publisher : Elsevier
ISBN 13 : 0080545157
Total Pages : 467 pages
Book Rating : 4.0/5 (85 download)

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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