Aza Crown Macrocycles

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Aza Crown Macrocycles

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Author : Jerald S. Bradshaw
language : en
Publisher: John Wiley & Sons
Release Date : 2009-09-17

Aza Crown Macrocycles written by Jerald S. Bradshaw 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 2009-09-17 with Science categories.

The Chemistry of Heterocyclic Compounds, since its inception, has been recognized as a cornerstone of heterocyclic chemistry. Each volume attempts to discuss all aspects – properties, synthesis, reactions, physiological and industrial significance – of a specific ring system. To keep the series up-to-date, supplementary volumes covering the recent literature on each individual ring system have been published. Many ring systems (such as pyridines and oxazoles) are treated in distinct books, each consisting of separate volumes or parts dealing with different individual topics. With all authors are recognized authorities, the Chemistry of Heterocyclic Chemistry is considered worldwide as the indispensable resource for organic, bioorganic, and medicinal chemists.

Aza Crown Macrocycles Volume 51

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Author : Jerald S. Bradshaw
language : en
Publisher: Wiley-Interscience
Release Date : 1993-05-17

Aza Crown Macrocycles Volume 51 written by Jerald S. Bradshaw and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-05-17 with Science categories.

The Chemistry of Heterocyclic Compounds, since its inception, has been recognized as a cornerstone of heterocyclic chemistry. Each volume attempts to discuss all aspects – properties, synthesis, reactions, physiological and industrial significance – of a specific ring system. To keep the series up-to-date, supplementary volumes covering the recent literature on each individual ring system have been published. Many ring systems (such as pyridines and oxazoles) are treated in distinct books, each consisting of separate volumes or parts dealing with different individual topics. With all authors are recognized authorities, the Chemistry of Heterocyclic Chemistry is considered worldwide as the indispensable resource for organic, bioorganic, and medicinal chemists.

The Chemistry Of Heterocyclic Compounds

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Author :
language : un
Publisher:
Release Date : 1993

The Chemistry Of Heterocyclic Compounds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

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.

Chromans And Tocopherols

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Author : Gwynn P. Ellis
language : en
Publisher: Wiley-Interscience
Release Date : 1981-04-01

Chromans And Tocopherols written by Gwynn P. Ellis and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-04-01 with Science categories.

Professionals in the field comprehensively summarize all the literature that pertains to known members of these classes of compounds. An extensive subject index and comprehensive tables of all recognized compounds permit easy location of data.

Insights Into The Chemistry Of Organic Structure Directing Agents In The Synthesis Of Zeolitic Materials

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Author : Luis Gómez-Hortigüela
language : en
Publisher: Springer
Release Date : 2018-03-31

Insights Into The Chemistry Of Organic Structure Directing Agents In The Synthesis Of Zeolitic Materials written by Luis Gómez-Hortigüela and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-31 with Science categories.

This edited volume focuses on the host-guest chemistry of organic molecules and inorganic systems during synthesis (structure-direction). Organic molecules have been used for many years in the synthesis of zeolitic nanoporous frameworks. The addition of these organic molecules to the zeolite synthesis mixtures provokes a particular ordering of the inorganic units around them that directs the crystallization pathway towards a particular framework type; hence they are called structure-directing agents. Their use has allowed the discovery of an extremely large number of new zeolite frameworks and compositions. This volume covers the main aspects of the use of organic molecules as structure-directing agents for the synthesis of zeolites, including first an introduction of the main concepts, then two chapters covering state-of-the-art techniques currently used to understand the structure-directing phenomenon (location of molecules by XRD and molecular modeling techniques). The most recent trends in the types of organic molecules used as structure-directing agents are also presented, including the use of metal-complexes, the use of non-ammonium-based molecules (mainly phosphorus-based compounds) and the role of supramolecular chemistry in designing new large organic structure-directing agents produced by self-aggregation. In addition the volume explores the latest research attempting to transfer the asymmetric nature of organic chiral molecules used as structure-directing agents to the zeolite lattice to produce chiral enantioselective frameworks, one of the biggest challenges today in materials chemistry. This volume has interdisciplinary appeal and will engage scholars from the zeolite community with a general interest in microporous materials, which involves not only zeolite scientists, but also researchers working on metal-organic framework materials. The concepts covered will also be of interest for researchers working on the application of materials after encapsulation of molecules of interest in post-synthetic treatments. Further the work explores the main aspects of host-guest chemistry in hybrid organo-inorganic templated materials, which covers all types of materials where organic molecules are used as templates and are confined within framework-structured inorganic materials (intercalation compounds). Therefore the volume is also relevant to the wider materials chemistry community.

Advances In Carbohydrate Chemistry And Biochemistry

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Author :
language : en
Publisher: Academic Press
Release Date : 2014-12-02

Advances In Carbohydrate Chemistry And Biochemistry written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-02 with Science categories.

Since its inception in 1945, this serial has provided critical and informative articles written by research specialists that integrate industrial, analytical, and technological aspects of biochemistry, organic chemistry, and instrumentation methodology in the study of carbohydrates. The articles provide a definitive interpretation of the current status and future trends in carbohydrate chemistry and biochemistry. Features contributions from leading authorities and industry experts Informs and updates on all the latest developments in the field

Noncovalent Interactions Between Alkali Metal Cation And Aza Thia Crown Macrocycles

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Author : Calvin A. Austin
language : en
Publisher:
Release Date : 2015

Noncovalent Interactions Between Alkali Metal Cation And Aza Thia Crown Macrocycles written by Calvin A. Austin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Chemistry, Analytic categories.

Results here suggests that the nitrogen donor atoms macrocycles can selectivity and strongly bind the alkali metal cations in the proper environment similar to oxygen donor atoms macrocycles.

Macrocycles

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Author : Frank Davis
language : en
Publisher: John Wiley & Sons
Release Date : 2011-02-23

Macrocycles written by Frank Davis 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 2011-02-23 with Technology & Engineering categories.

Macrocyclic molecules contain rings made up of seven or more atoms. They are interesting because they provide building blocks for synthesizing precise two or three dimensional structures – an important goal in nanotechnology. For example, they can be used to develop nanosized reaction vessels, cages, switches and shuttles, and have potential as components in molecular computers. They also have applications as catalysts and sensors. Macrocycles: Construction, Chemistry and Nanotechnology Applications is an essential introduction this important class of molecules and describes how to synthesise them, their chemistry, how they can be used as nanotechnology building blocks, and their applications. A wide range of structures synthesised over the past few decades are covered, from the simpler cyclophanes and multi-ring aromatic structures to vases, bowls, cages and more complex multi-ring systems and 3D architectures such as “pumpkins”, interlocking chains and knots. Topics covered include: principles of macrocycle synthesis simple ring compounds multi-ring aromatic structures porphyrins and phthalocanines cyclophanes crown ethers, cryptands and spherands calixarenes, resorcinarenes, cavitands, carcerands, and heterocalixarenes cyclodextrins cucurbiturils cyclotriveratylenes rotaxanes catenanes complex 3D architectures, including trefoils and knots Macrocycles: Construction, Chemistry and Nanotechnology Applications distills the essence of this important topic for undergraduate and postgraduate students, and for researchers in other fields interested in getting a general insight into this increasingly important class of molecules.

Chemistry Of Heterocyclic Compounds

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Author : J. S. Bradshaw
language : en
Publisher:
Release Date : 1950

Chemistry Of Heterocyclic Compounds written by J. S. Bradshaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1950 with Crown ethers categories.