Early Transition Metal Complexes of Carbene Donors Linked to Cyclopentadienyl Ring Analogues Or Amidine/amidinate Moieties PDF Download
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Author: Susana Conde Guadaño
Publisher:
ISBN:
Category :
Languages : en
Pages : 199
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Author: Susana Conde Guadaño
Publisher:
ISBN:
Category :
Languages : en
Pages : 199
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Book Description
Author: Susan Conde Guadano
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The new indenyl-functionalised NHC potassium salt, 1-[3-(4,7-dimethylindenylpropyl)]-3- (2,6-diisopropylphenyl)imidazol-2-ylidenepotassium, has been synthesised. Complexes of titanium, zirconium and chromium containing this ligand and the two carbon bridge analogue, 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6-diisopropylphenyl)imidazol-2 ylidene potassium, have been synthesised and characterised by X-ray crystallographic techniques. The following complexes were tested as catalysts for the oligomerisation of ethylene in the presence of MAO: 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene(tertbutylimido) titanium chloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- dimethylindenyl)propyl]imidazol-2-ylidene(tert-butylimido)titanium chloride, 3-(2,6- diisopropylphenyl)-1-[3-(4,7-dimethylindenyl)propyl]imidazol-2-ylidenezirconium trichloride, 3-(2,6-diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]imidazol-2- ylidenezirconium trichloride, 3-(2,6-Diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]- imidazol-2-ylidenechromium dichloride, 3-(2,6-diisopropylphenyl)-1-[3-(4,7- (dimethylindenyl))propyl]imidazol-2-ylidene chromium dichloride, 3-(2,6-diisopropylphenyl)- 1-[3-(4,7-dimethylindenyl)propyl]-imidazol-2-ylidene chromium methyl chloride and 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidenevanadium dichloride. The following alkyl chromium complexes containing 1-[2-(4,7-dimethylindenyl)ethyl]-3-(2,6- diisopropylphenyl)imidazol-2 ylidene potassium have also been synthesised: 3-(2,6- diisopropylphenyl)-1-[2-(4,7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium phenyl chloride and 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7-dimethylindenyl)ethyl]-imidazol-2-ylidene chromium dibenzyl. Chromium cations have been synthesised using as starting materials the chromium alkyl complexes. The Cr(II) complex 3-(2,6-diisopropyl-phenyl)-1-[2-(4, 7- dimethylindenyl)ethyl]-imidazol-2-ylidene chromium monochloride and a partially oxidised dimerised product were also isolated. 5-(2-chloroethyl)- 1, 2, 3, 4-tetramethylcyclopentadiene and 5-(3-chloropropyl) 1, 2, 3, 4-tetramethylcyclopentadiene were synthesised and isolated as geminal isomers for the first time. The trialkyl chromium complex, tribenzyl chromium tris(tetrahydrofuran) was synthesised and also it was used as starting material for the complexes di(benzyl)chromium bis(1, 3- diisopropylimidazol-2-ylindene) and tri(benzyl)chromium TACN. All complexes were characterised by X-ray crystallography. The imidazolium salt 3-(2.6-diisopropylphenyl)-1-[N, N-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride was synthesised and used as a precursor for the synthesis of amidinate-functionalised NHC zirconium and amidine-functionalised NHC silver complexes. Double deprotonation of 3-(2,6-diisopropylphenyl)-1-[N, N'-bis(2,6- diisopropylphenyl)acetamidyl] imidazolium chloride gave the amidinate-functionalised NHC ligand, 3-(2.6-diisopropylphenyl)-1-[2-N, N'bis(2,6 diisopropylphenylamidinate)ethyl]imidazol-2-ylidenepotassium. Titanium, zirconium and chromium complexes containing this ligand were synthesised and characterised by X-ray crystallographic techniques. Transmetallation of the amidine-functionalised NHC silver complex with [Rh(COD)Cl]2 and [Ir(COD)Cl]2 gave the corresponding species. Rh(amidinefunctionalised NHC)(COD)Cl reacted with Na(BAr)4 (Ar = 3,5-CF3C6H3) to give the cation Rh(amidine-functionalised NHC)(COD)]+[BAr4]-. These species were also characterised by X-ray diffraction techniques.
Author: Geoffrey Wilkinson
Publisher:
ISBN:
Category : Organometallic compounds
Languages : en
Pages :
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Author: Robert B. Grossman
Publisher: Springer Science & Business Media
ISBN: 0387954686
Category : Science
Languages : en
Pages : 371
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Book Description
Intended for students of intermediate organic chemistry, this text shows how to write a reasonable mechanism for an organic chemical transformation. The discussion is organized by types of mechanisms and the conditions under which the reaction is executed, rather than by the overall reaction as is the case in most textbooks. Each chapter discusses common mechanistic pathways and suggests practical tips for drawing them. Worked problems are included in the discussion of each mechanism, and "common error alerts" are scattered throughout the text to warn readers about pitfalls and misconceptions that bedevil students. Each chapter is capped by a large problem set.
Author: Silvia Diez-Gonzalez
Publisher: Royal Society of Chemistry
ISBN: 1782626816
Category : Science
Languages : en
Pages : 637
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Book Description
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.
Author: Milton Orchin
Publisher: John Wiley & Sons
ISBN: 0471713732
Category : Science
Languages : en
Pages : 904
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Book Description
This book is a basic reference providing concise, accurate definitions of the key terms and concepts of organic chemistry. Not simply a listing of organic compounds, structures, and nomenclatures, the book is organized into topical chapters in which related terms and concepts appear in close proximity to one another, giving context to the information and helping to make fine distinctions more understandable. Areas covered include: bonding, symmetry, stereochemistry, types of organic compounds, reactions, mechansims, spectroscopy, and photochemistry.
Author: Jack Hine
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 224
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Author: Gabriela Guillena
Publisher: Springer
ISBN: 3319430513
Category : Science
Languages : en
Pages : 393
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Book Description
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.
Author: Markku Tilli
Publisher: Elsevier
ISBN: 0815519885
Category : Technology & Engineering
Languages : en
Pages : 670
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Book Description
A comprehensive guide to MEMS materials, technologies and manufacturing, examining the state of the art with a particular emphasis on current and future applications. Key topics covered include: Silicon as MEMS material Material properties and measurement techniques Analytical methods used in materials characterization Modeling in MEMS Measuring MEMS Micromachining technologies in MEMS Encapsulation of MEMS components Emerging process technologies, including ALD and porous silicon Written by 73 world class MEMS contributors from around the globe, this volume covers materials selection as well as the most important process steps in bulk micromachining, fulfilling the needs of device design engineers and process or development engineers working in manufacturing processes. It also provides a comprehensive reference for the industrial R&D and academic communities. Veikko Lindroos is Professor of Physical Metallurgy and Materials Science at Helsinki University of Technology, Finland. Markku Tilli is Senior Vice President of Research at Okmetic, Vantaa, Finland. Ari Lehto is Professor of Silicon Technology at Helsinki University of Technology, Finland. Teruaki Motooka is Professor at the Department of Materials Science and Engineering, Kyushu University, Japan. Provides vital packaging technologies and process knowledge for silicon direct bonding, anodic bonding, glass frit bonding, and related techniques Shows how to protect devices from the environment and decrease package size for dramatic reduction of packaging costs Discusses properties, preparation, and growth of silicon crystals and wafers Explains the many properties (mechanical, electrostatic, optical, etc), manufacturing, processing, measuring (incl. focused beam techniques), and multiscale modeling methods of MEMS structures
Author: Stephen T Liddle
Publisher: World Scientific
ISBN: 1800610173
Category : Science
Languages : en
Pages : 727
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Book Description
The Lanthanides and Actinides: Synthesis, Reactivity, Properties and Applications constitutes an introduction to and comprehensive coverage of f-block chemistry encompassing the following areas: periodicity, natural occurrence and extraction, separations, electronic structure, coordination chemistry, organometallic chemistry, small molecule activation, catalysis, organic synthesis applications, magnetism, spectroscopy, computation, materials, photonics, solar cell technology, biological imaging, and technological applications. Under these subject areas the book provides a broad but deep coverage, providing basic overviews as well as detailed chapters on specific areas.This book, targeted at academics, postgraduates and advanced undergraduates, will serve as an ideal introductory text and key reference work to the Lanthanides and Actinides.
