Synthesis and Application of Planar Chiral Cobalt Metallocene Based Palladacycle Catalysts PDF Download
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Author: Mehbuba Rukni Yeamine
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Mehbuba Rukni Yeamine
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Mehbuba Rukni Yeamine
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Marko Hapke
Publisher: John Wiley & Sons
ISBN: 3527344500
Category : Technology & Engineering
Languages : en
Pages : 480
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Book Description
Provides a much-needed account of the formidable "cobalt rush" in organic synthesis and catalysis Over the past few decades, cobalt has turned into one of the most promising metals for use in catalytic reactions, with important applications in the efficient and selective synthesis of natural products, pharmaceuticals, and new materials. Cobalt Catalysis in Organic Synthesis: Methods and Reactions provides a unique overview of cobalt-catalysed and -mediated reactions applied in modern organic synthesis. It covers a broad range of homogeneous reactions, like cobalt-catalysed hydrogenation, hydrofunctionalization, cycloaddition reactions, C-H functionalization, as well as radical and biomimetic reactions. First comprehensive book on this rapidly evolving research area Covers a broad range of homogeneous reactions, such as C-H activation, cross-coupling, synthesis of heterocyclic compounds (Pauson-Khand), and more Chapters on low-valent cobalt complexes as catalysts in coupling reactions, and enantioselective cobalt-catalyzed transformations are also included Can be used as a supplementary reader in courses of advanced organic synthesis and organometallic chemistry Cobalt Catalysis in Organic Synthesis is an ideal book for graduates and researchers in academia and industry working in the field of synthetic organic chemistry, catalysis, organometallic chemistry, and natural product synthesis.
Author: James Daniel Osborne
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 488
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Book Description
Author: Jairton Dupont
Publisher: John Wiley & Sons
ISBN: 3527317813
Category : Science
Languages : en
Pages : 433
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Book Description
From synthesis to applications in catalysis, material science and biology this much-needed book is the first to comprehensively present everything you need to know about palladacycles. Renowned international authors guarantee high-quality content, making this a must-have for everyone working in the field.
Author: Wilson D. Shafer
Publisher: MDPI
ISBN: 303928388X
Category : Science
Languages : en
Pages : 414
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Book Description
Since the turn of the last century when the field of catalysis was born, iron and cobalt have been key players in numerous catalysis processes. These metals, due to their ability to activate CO and CH, haev a major economic impact worldwide. Several industrial processes and synthetic routes use these metals: biomass-to-liquids (BTL), coal-to-liquids (CTL), natural gas-to-liquids (GTL), water-gas-shift, alcohol synthesis, alcohol steam reforming, polymerization processes, cross-coupling reactions, and photocatalyst activated reactions. A vast number of materials are produced from these processes, including oil, lubricants, waxes, diesel and jet fuels, hydrogen (e.g., fuel cell applications), gasoline, rubbers, plastics, alcohols, pharmaceuticals, agrochemicals, feed-stock chemicals, and other alternative materials. However, given the true complexities of the variables involved in these processes, many key mechanistic issues are still not fully defined or understood. This Special Issue of Catalysis will be a collaborative effort to combine current catalysis research on these metals from experimental and theoretical perspectives on both heterogeneous and homogeneous catalysts. We welcome contributions from the catalysis community on catalyst characterization, kinetics, reaction mechanism, reactor development, theoretical modeling, and surface science.
Author: Laura Cunningham
Publisher:
ISBN:
Category : Chirality
Languages : en
Pages : 350
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Author: James Harrison Frederich
Publisher:
ISBN: 9781124516141
Category :
Languages : en
Pages : 364
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Book Description
Chapter 1. This chapter provides a review of the evolution of palladacycles within the field of homogeneous catalysis. Their discovery, early uses as precatalysts for Pd(0)-promoted reactions, and contemporary uses in asymmetric catalysis are discussed. An in-depth discussion regarding approaches to the synthesis of palladacycles is also presented. Studies toward the development of planar-chiral palladacycles as asymmetric catalysts for the enantioselective formation of allylic carbon-heteroatom bonds is summarized, with a focus on work preformed in the Overman Group regarding enantioselective reactions of prochiral allylic trichloroacetimidates. Chapter 2. Presented herein is the synthesis and evaluation of a library of novel homochiral palladacyclic imidazoline naphthalene (PIN) catalysts for the enantioselective reactions of prochiral allylic trichloroacetimidates. This new Pd(II) catalyst motif relies on steric interactions between the central naphthalene ring and imidazoline heterocycle to create a rigid and adjustable axial chiral environment around the metal center. Positioning of the chiral pocket can be adjusted by careful choice of the imidazoline substituents, proving a handle to optimize catalyst structure. Monomeric (S)-PIN-acac complexes were evaluated as catalysts for both the allylic imidate rearrangement and allylic esterification of (Z)-allylic trichloroacetimidates, exhibiting excellent catalytic activity in the latter reaction. Although this catalyst motif did not provide an advantage over extant planar-chiral cobalt oxazoline palladacycle (COP) catalysts, insight into the ideal positioning of the chiral environment around the Pd(II) center was garnered. Chapter 3. Building from the conclusions discussed in Chapter 2, this chapter presents the synthesis and evaluation of a library 2-arylpyrrorlidine palladacycle (APP) catalysts, wherein the axial chiral pocket of the C, N-palladacycle has been created in closer proximity to the Pd(II) center. The APP motif displays excellent catalytic activity in the SN2′ displacement of (Z)-allylic trichloroacetimidates with acetate nucleophiles, affording chiral, non-racemic allylic acetates in high yield and moderate enantiomeric excess. The repositioning of the chiral environment is shown to increase enantioselectivity relative to the PIN catalyst motif. A summation of the important conclusions regarding the design of enantioselective palladacycle catalysts is presented.
Author: Chung Sik Kim
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A variety of bromocorroles, useful precusors for Pd-based cross coupling, were sucessfully synthesized in moderate to good yields. Chiral corroles were also synthesized through use of chiral amides in the aforementioned cross coupling reactions. Cobalt complexes bearing I?-acceptor (CNtBu) and I?-donor (PPh3) ligands were also prepared in excellent yields. In this dissertation, cobalt (III) corrole complexes were applied to three different reaction areas: epoxidation, N-H insertion, and cyclopropanation. Cobalt(III) corroles were found to be efficient catalysts for epoxidation reactions. The epoxidation reactions can be carried out using ethyl phenyldiazoacetate, an acceptor/donor diazo compound, as a carbenoid precusor. The reaction provided highly diastereoselective epoxides. In addition to epoxidation, N-H insertion reactions using cobalt(III) corroles as catalysts smoothly produced the desired products with diverse diazo reagents. The reactions were screened using ethyl phenyldiazoacetate with a selection of anilines and amides. In order to investigate non-ylide intermediate based metal-mediated catalytic reactions, cyclopropanation was conducted using cobalt (III) corroles as catalysts, producing the desired cyclopropyl nitroesters in high yields and with excellent diastereoselectivity under a concerted mechanism. Asymmetric cyclopropanation reactions were carried out using chiral cobalt(III) corrole complexes to generate the enatiomerically pure desired cyclopropanes in moderate yields.
Author: Iwao Omae
Publisher: Springer Science & Business Media
ISBN: 4431546049
Category : Science
Languages : en
Pages : 214
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Book Description
This book provides a review of cyclometalation reactions and organometallic intramolecular-coordination five-membered ring products, the most active type of reactions in synthetic organic reactions and their products. Included is the discovery of intramolecular-coordination bonds in cyclometalation reactions and the characteristics of those reactions, as well as the reasons that their five-membered ring compounds are very easily synthesized through such reactions. In addition, the applications of cyclometalation reactions and five-membered ring products, synthetic applications, catalysts, and other products are described. These topics are of special interest for industrial researchers.
