Deprotonated Aza Crown Ligands As Simple And Effective Alternatives To C Me In Group 3 4 And Lanthanide Chemistry
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Deprotonated Aza Crown Ligands As Simple And Effective Alternatives To C Me In Group 3 4 And Lanthanide Chemistry
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Author : Lawrence Way Mung Lee
language : en
Publisher:
Release Date : 1997
Deprotonated Aza Crown Ligands As Simple And Effective Alternatives To C Me In Group 3 4 And Lanthanide Chemistry written by Lawrence Way Mung Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
The ability of a deprotonated aza-crown ether to allow isolation of soluble lanthanide and yttrium complexes has been investigated. A convenient route to these complexes has been demonstrated by the protonolysis reactions of Ln[(N(SiMe3)2]3 with 4,13-diaza-18-crown-6. NMR spectroscopy and X-ray crystallography revealed a C2V structure consisting of a basket shaped geometry. The successful protonolysis route has been extended to the preparation of stable alkyls, dialkyls, and alkyl cations of yttrium and zirconium stabilized by deprotonated aza-crown macrocycles. A yttrium, alkyl complex containing deprotonated diaza-18-crown-6 has been prepared by the protonolysis route. The thermal stability and reactivity of this complex were investigated. This alkyl reacts with terminal alkynes to produce a complex equilibrium between the colourless monomeric and dimeric alkynides and a purple Z-butatrienediyl (ie.RC=C=C=CR2−) coupling product. NMR studies demonstrate that electron poor alkynes favour coupling and that the carbon-carbon double bond forming process is readily reversible at room temperature. The flexibility of the deprotonated diaza-crown ligand is apparent from the isolation of both cis and trans-zirconium dibenzyl complexes from the protonolysis of tetrabenzyl zirconium with 4,13-diaza-18-crown-6. The structure of both isomers were investigated by NMR spectroscopy and X-ray crystallography. Both the cis and trans-isomers cleanly converted to the stable cation either by protonolysis with [n-Bu3NH]+[BPh4]− or by alkyl abstraction with B(C6F5)3. The reactivity of the alkyl cation derived from the reaction with B(C6F5)3 was investigated. The reaction of this cation with t-BuNC gave a vinylamide complex following a 1,2-proton rearrangement of an initially formed iminoacyl. Two members of the still rare yttrium dialkyl class of compounds were isolated using monoanionic, deprotonated aza-crown ethers as supporting ligation. The dialkyl complexes were synthesized by protonolysis of Y(CH2SiMe3)3(THF)2 with either aza-18-crown-6 or aza-15-crown-5. NMR and X-ray analyses of the yttrium dialkyl supported by aza-18-crown-6 indicates a trans-dialkyl geometry while NMR analysis of the aza-15-crown-5 analog indicates a cis-dialkyl geometry. Reaction of the trans-dialkyl complex with CO afforded a trans-dienolate complex formed by the migration of SiMe3. Alkyl abstraction from the trans-dialkyl complex using B(C6F5)3 allowed generation of the first yttrium, alkyl cation.
Deprotonated Aza Crown Ligands As Simple And Effective Alternatives To C 5me 5 In Group 3 4 And Lanthanide Chemistry
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Author :
language : en
Publisher:
Release Date : 1998
Deprotonated Aza Crown Ligands As Simple And Effective Alternatives To C 5me 5 In Group 3 4 And Lanthanide Chemistry written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1999
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Dissertations, Academic categories.
Crown Ethers And Cryptands
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Author : George W. Gokel
language : en
Publisher:
Release Date : 1991
Crown Ethers And Cryptands written by George W. Gokel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Science categories.
This book introduces the broad and basic principles of crown ether and cryptand chemistry at the advanced undergraduate, graduate and working professional level.
Anion Receptor Chemistry
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Author : Jonathan L Sessler
language : en
Publisher: Royal Society of Chemistry
Release Date : 2007-10-31
Anion Receptor Chemistry written by Jonathan L Sessler and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-10-31 with Science categories.
Anion recognition plays a critical role in a range of biological processes, and a variety of receptors and carriers can be found throughout the natural world. Chemists working in the area of supramolecular chemistry have created a range of anion receptors, drawing inspiration from nature as well as their own inventive processes. This book traces the origins of anion recognition chemistry as a unique sub-field in supramolecular chemistry while illustrating the basic approaches currently being used to effect receptor design. The combination of biological overview and summary of current synthetic approaches provides a coverage that is both comprehensive and comprehensible. First, the authors detail the key design motifs that have been used to generate synthetic receptors and which are likely to provide the basis for further developments. They also highlight briefly some of the features that are present in naturally occurring anion recognition and transport systems and summarise the applications of anion recognition chemistry. Providing as it does a detailed review for practitioners in the field and a concise introduction to the topic for newcomers, Anion Receptor Chemistry reflects the current state of the art. Fully referenced and illustrated in colour, it is a welcome addition to the literature.
Chelation Therapy In The Treatment Of Metal Intoxication
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Author : Jan Aaseth
language : en
Publisher: Academic Press
Release Date : 2016-04-18
Chelation Therapy In The Treatment Of Metal Intoxication written by Jan Aaseth and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-18 with Medical categories.
Chelation Therapy in the Treatment of Metal Intoxication presents a practical guide to the use of chelation therapy, from its basic chemistry, to available chelating antidotes, and the application of chelating agents. Several metals have long been known to be toxic to humans, and continue to pose great difficulty to treat. These challenges pose particular problems in industrial settings, with lead smelting known to be associated with hemopoietic alterations and paralyses, and the inhalation of mercury vapor in mercury mining being extremely detrimental to the central nervous system. Clinical experience has demonstrated that acute and chronic human intoxications with a range of metals can be treated efficiently by administration of chelating agents. Chelation Therapy in the Treatment of Metal Intoxication describes the chemical and biological principles of chelation in the treatment of these toxic metal compounds, including new chelators such as meso-2,3-dimercaptosuccinic acid (DMSA) and D,L-2,3-dimercapto-1-propanesulfonic acid (DMPS). Presents all the current findings on the potential for chelation as a therapy for metal intoxication Presents practical guidelines for selecting the most appropriate chelating agent Includes coverage on radionuclide exposure and metal storage diseases Describes the chemical and biological principles of chelation in the treatment of toxic metal compounds
Lanthanides Series Determination By Various Analytical Methods
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Author : Mohammad Reza Ganjali
language : en
Publisher: Elsevier
Release Date : 2016-02-25
Lanthanides Series Determination By Various Analytical Methods written by Mohammad Reza Ganjali and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-02-25 with Science categories.
Lanthanides Series Determination by Various Analytical Methods describes the different spectroscopic and electrochemical methods used for the determination and measurement of lanthanides. Numerous examples of determination methods used in real sample analysis are gathered and explained, and the importance of lanthanides as applied in chemical industry, agriculture, clinical and pharmaceutical industry, and biology is discussed, with many applications and recent advantages given. Written by world-leading experts in research on lanthanide determination Discusses determination methods that range from very advanced and expensive techniques to simple and inexpensive methods A single source of information for a broad collection of lanthanide detection techniques and applications Includes a complete list of reports and patents on lanthanide determination Discusses both advantages and disadvantages of each determination method, giving a well-balanced overview
Encyclopedia Of Supramolecular Chemistry Two Volume Set Print
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Author : Jerry L. Atwood
language : en
Publisher: CRC Press
Release Date : 2013-10-09
Encyclopedia Of Supramolecular Chemistry Two Volume Set Print written by Jerry L. Atwood and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-09 with Science categories.
The two-volume Encyclopedia of Supramolecular Chemistry offers authoritative, centralized information on a rapidly expanding interdisciplinary field. User-friendly and high-quality articles parse the latest supramolecular advancements and methods in the areas of chemistry, biochemistry, biology, environmental and materials science and engineering, physics, computer science, and applied mathematics. Designed for specialists and students alike, the set covers the fundamentals of supramolecular chemistry and sets the standard for relevant future research.
Greene S Protective Groups In Organic Synthesis
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Author : Peter G. M. Wuts
language : en
Publisher: John Wiley & Sons
Release Date : 2012-12-20
Greene S Protective Groups In Organic Synthesis written by Peter G. M. Wuts and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-20 with Science categories.
The Fourth Edition of Greene's Protective Groups in Organic Synthesis continues to be an indispensable reference for controlling the reactivity of the most common functional groups during a synthetic sequence. This new edition incorporates the significant developments in the field since publication of the third edition in 1998, including... New protective groups such as the fluorous family and the uniquely removable 2-methoxybenzenesulfonyl group for the protection of amines New techniques for the formation and cleavage of existing protective groups, with examples to illustrate each new technique Expanded coverage of the unexpected side reactions that occur with protective groups New chart covering the selective deprotection of silyl ethers 3,100 new references from the professional literature The content is organized around the functional group to be protected, and ranges from the simplest to the most complex and highly specialized protective groups.
Chiral Amine Synthesis
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Author : Thomas C. Nugent
language : en
Publisher: John Wiley & Sons
Release Date : 2010-01-14
Chiral Amine Synthesis written by Thomas C. Nugent and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-14 with Science categories.
This first comprehensive presentation of this hot and important topic compiles the most up-to-date methods for chiral amine synthesis. The international list of authors reads like a "Who's Who" of the subject, providing a large array of highly practical information concentrated into the useful and essential methods. Following an introductory chapter devoted to helping readers quickly determine which strategies to choose for their investigation, this handbook and ready reference focuses on the examination of methods that are reliable and simultaneously efficient for the synthesis of structurally diverse aliphatic and aromatic chiral amines. Modern methods and applications found in (pharmaceutical) industry are also covered.