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Synthesis Of Novel Cyclopentadienyl Cobalti Complexes And Their Application In 2 2 2 Cycloaddition Reactions
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Book Synopsis Synthesis of Novel Cyclopentadienyl Cobalt(I)-complexes and Their Application in [2+2+2] Cycloaddition Reactions by : Indre Thiel
Download or read book Synthesis of Novel Cyclopentadienyl Cobalt(I)-complexes and Their Application in [2+2+2] Cycloaddition Reactions written by Indre Thiel and published by . This book was released on 2013 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Cationic Cobalt(I)-complexes for Enantioselective Cycloaddition and Hydrofunctionalization Reactions by : Mahesh M. Parsutkar
Download or read book Development of Cationic Cobalt(I)-complexes for Enantioselective Cycloaddition and Hydrofunctionalization Reactions written by Mahesh M. Parsutkar and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments of new catalytic transformations by using earth-abundant metal (base-metal) catalysts have played a significant role in modern civilization and will continue to play a vital role towards maintaining and improving our quality of life. Particularly, these transformations have had a tremendous impacts on the agricultural, transport, energy, and pharmaceutical sectors. This field of base-metal catalysis would enjoy added benefits with the utilization of sustainable feedstock carbon sources for fine chemical synthesis. However, the dual problems of activation of thermodynamically stable precursors (ethylene, CO2, H2, CO, aldehydes, acrylates, HCN) and their highly stereoselective incorporation into other readily available substrates (1,3-dienes, alkynes, enynes) pose new challenges. In a nutshell, the development of benign catalysts for employing sustainable feedstock starting materials has the potential to transform inexpensive materials into valuable precursors for fine chemical synthesis. My dissertation work focuses on the development of scalable, atom-economical, and cost-effective catalytic methods for the preparation of value-added products relevant to fine chemicals. The overarching aims are to use sustainable feedstocks or readily available precursors, and environmentally benign chemistry. To achieve these goals, three efficient catalytic methods have been developed which employ complexes of an earth-abundant metal, cobalt, with ligands derived from naturally occurring amino acids or commercially available bis-phosphine ligands. The key to success was a systematic ligands investigation that inspired the design and synthesis of novel ligands to achieve high chemo-, regio-, and enantioselectivities. In the first methodology, a broadly applicable method affecting [2+2] cycloaddition between several alkynes and alkenyl derivatives to form cyclobutenes has been disclosed. A library of >70 nearly enantiopure cyclobutenes, which are ubiquitous motifs in bioactive compounds, have been synthesized in excellent yields. In the second methodology, ligand controlled regio-divergent enantioselective synthesis of primary and secondary homoallylic boronates (>50 examples) from readily available 1,3-dienes and a common boron reagent have been developed. Furthermore, the hydrofunctionalization of 1,3-dienes program has been extended to unprecedented enantioselective hydroacylation of 1,3-dienes. This method opens a realm to achieve the synthesis of enantiopure alpha- or beta-chiral center containing ketones. In all the mentioned transformations above, cationic Co(I)- species has been invoked as an active catalyst. To further corroborate the role of cationic Co(I)-complexes, a reliable protocol has been developed to synthesize, isolate discrete neutral and cationic Co(I)-complexes and characterized by X-ray crystallography. These isolated cationic complexes serve as an excellent single-component catalyst for heterodimerization, hydroboration, and hydroacylation, suggesting the key role of cationic Co(I)-complexes in these transformations. While developing these efficient methodologies, striking ligand, counterion, and solvent effects have been revealed along with a unique role of a cationic Co(I) intermediate in the reactions which advanced novel fundamental concepts. We believe that these cationic Co(I) complexes have broader utility in homogeneous catalysis. We hope that the rational evolution of a mechanism-based strategy that led to the eventual successful outcome and the attendant support studies will add to the burgeoning organometallic chemistry of cobalt and its applications with further implications beyond the synthetic reactions described in this dissertation.
Book Synopsis Exploring the Chemistry of Cyclopentadienyl-cobalt-cyclobutadiene (CpCoCb) Complexes and Synthesis of Side-chain CpCoCb Polymers by : Preeti Chadha
Download or read book Exploring the Chemistry of Cyclopentadienyl-cobalt-cyclobutadiene (CpCoCb) Complexes and Synthesis of Side-chain CpCoCb Polymers written by Preeti Chadha and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthetic metallopolymers have acquired ample attention recently due to their potential applications as precursors to functional soft materials. Organometallic polymers combine the best of both organic and inorganic polymers. Polyferrocenes comprise the major portion of organometallic polymers. Therefore, quest for new monomeric precursors to organometallic polymers has expediated. One efficient method for obtaining main-chain metallopolymers is by the ring opening polymerization (ROP) of strained cyclic metallacylophanes(MCPs). Organometallic polymers containing cyclopentadienyl-cobalt-cyclobutadiene (CpCoCb) have been targeted since early 1990's due to their isoelectronic nature (cf. ferrocene) with three major groups working in this area. The early CpCoCb containing polymers were prepared by alkyne dimerization of a bis-alkyne at the Co(I) centre, which did not provide good control over the molecular weights of the polymers generated. In search of novel Co(I) monomers for ROP, synthesis of sila- and germa- [2]cobaltoarenophanes was undertaken via. unprecedented direct dilthiation of (CpCoCb*) (Cb* = tetramethylcyclobutadiene) and subsequent treatment with the main group dihalides. However, attempts to ring open the CH2-SiMe2 bridged [2]cobaltoarenophanes were unsuccessful, which was attributed to the lower degree of strain in these molecules. An alternative route to [1]cobaltoarenophanes was proposed taking advantage of alkyne dimerization at a substituted CpCo(I) complex featuring a coordinated pendent alkyne. In this regard, alkyne-appended cyclopentadienyl ligands were developed and their utility was explored in reaction with early and late transition metals such as Ti, Fe, Co and Ni. This resulted in the formation of bis-alkynyl metallocenes of Ti and Co and half sandwich Ni complexes featuring a pendent alkyne. Synthesis of side chain cobalt(I) polymers demonstrating the CpCoCb framework has also been explored, using pre-functionalized Cp ligands incorporating a polymerizable vinyl moiety.
Book Synopsis Olefin Polymerization by : Walter Kaminsky
Download or read book Olefin Polymerization written by Walter Kaminsky and published by Wiley-VCH. This book was released on 2006-08-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an enormous velocity, olefin polymerization has expanded to one of the most significant fields in polymers since the first industrial use about 50 years ago. In 2005, 100 million tons of polyolefins were produced - the biggest part was catalyzed by metallorganic compounds. The Hamburg Macromolecular Symposium 2005 with the title "Olefin Polymerization" involved topics such as new catalysts and cocatalysts, kinetics, mechanism and polymer reaction engineering, synthesis of special polymers, and characterization of polyolefins. The conference combined scientists from different disciplines to discuss latest research results of polymers and to offer each other the possibility of cooperation. This is reflected in this volume, which contains invited lectures and selected posters presented at the symposium.
Book Synopsis Seven-membered Carbocycle Synthesis by Cobalt-mediated [3 + 2 + 2] Allyl/alkyne Cycloaddition Reactions and Novel [5 + 2] Cyclopentadiene/alkyne Ring Expansions by :
Download or read book Seven-membered Carbocycle Synthesis by Cobalt-mediated [3 + 2 + 2] Allyl/alkyne Cycloaddition Reactions and Novel [5 + 2] Cyclopentadiene/alkyne Ring Expansions written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cyclopentadienyl Cobalt Dicarbonyl Induced Cyclizations of Diyne-enes in Synthesis of Cyclohexadiene Cobalt Complexes Applications Towards the Synthesis of Estrone by : Ethan Dane Sternberg
Download or read book Cyclopentadienyl Cobalt Dicarbonyl Induced Cyclizations of Diyne-enes in Synthesis of Cyclohexadiene Cobalt Complexes Applications Towards the Synthesis of Estrone written by Ethan Dane Sternberg and published by . This book was released on 1982 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Novel Substitution Chemistry of Cyclopentadienyl Complexes of Rhenium by : T. Warthen Douglass
Download or read book Synthesis and Novel Substitution Chemistry of Cyclopentadienyl Complexes of Rhenium written by T. Warthen Douglass and published by . This book was released on 2000 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cobalt Catalysis in Organic Synthesis by : Marko Hapke
Download or read book Cobalt Catalysis in Organic Synthesis written by Marko Hapke and published by John Wiley & Sons. This book was released on 2020-04-06 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Cobalt-mediated [2+2+2]cycloaddition of Bis(trimethylsilyl) Acetylene to the 2,3-double Bond of Benzofurans by : Brian Allan Siesel
Download or read book The Cobalt-mediated [2+2+2]cycloaddition of Bis(trimethylsilyl) Acetylene to the 2,3-double Bond of Benzofurans written by Brian Allan Siesel and published by . This book was released on 1996 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Novel Cyclopentadienone Based Transition Metal Complexes for Catalytic and Electrocatalytic Transfer Hydrogenation of Polar Bonds by : Weiwei Wu
Download or read book Development of Novel Cyclopentadienone Based Transition Metal Complexes for Catalytic and Electrocatalytic Transfer Hydrogenation of Polar Bonds written by Weiwei Wu and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Synthesis and Synthetic Utility of Novel Cyclopentadienyl Metal Complexes and Reactive Fragments by : Michael Bennett Freeman
Download or read book The Synthesis and Synthetic Utility of Novel Cyclopentadienyl Metal Complexes and Reactive Fragments written by Michael Bennett Freeman and published by . This book was released on 1979 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Cobalt-mediated Intermolecular [2 + 2 + 2] Cycloaddition of Diynes with Alkenes by : Barry Mark Johnson
Download or read book The Cobalt-mediated Intermolecular [2 + 2 + 2] Cycloaddition of Diynes with Alkenes written by Barry Mark Johnson and published by . This book was released on 1990 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Optically Active Cyclopentadienyl Ruthenium Complexes and Their Application in Asymmetric Catalysis by : Meera Rao
Download or read book Development of Optically Active Cyclopentadienyl Ruthenium Complexes and Their Application in Asymmetric Catalysis written by Meera Rao and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel ruthenium complexes were developed containing a cyclopentadienyl (Cp) ligand tethered to a chiral sulfoxide, which also serves as a ligand. These complexes were synthesized via a [3+2] dehydrogenative cycloaddition between a Ru-[pi]-allyl complex and a terminal acetylene. Using the cycloaddition as a key step, the desired sulfoxide-ligated complexes could be prepared in six linear steps without the use of toxic metallating reagents such as thallium salts. A diverse library of complexes could be accessed through this method, which speaks to the robust nature of the key cycloaddition step. Using these complexes, a CpRu-catalyzed branched-selective asymmetric allylic alkylation (AAA) was developed. Using this method, various oxygen nucleophiles could be alkylated with allyl chloride electrophiles to provide branched ethers, esters and alcohols with high levels of regio- and enantioselectivity. These complexes also were effective in catalyzing an asymmetric redox bicycloisomerization to generate complex [3.1.0]- and [4.1.0]-azabicycles from simple propargyl alcohol substrates.
Book Synopsis Organometallics in Organic Synthesis by : Armin de Meijere
Download or read book Organometallics in Organic Synthesis written by Armin de Meijere and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: More and more possible applications of organometallic compounds in organic synthesis have been uncovered and a growing number of scientists are attracted to this area of research. This book presents an state-of-the-art account of the successful application of main- and transition metal mediated syntheses. It will stimulate new ideas and initiate further research in all areas of this fascinating chemistry.
Book Synopsis Inventing Reactions by : Lukas J. Gooßen
Download or read book Inventing Reactions written by Lukas J. Gooßen and published by Springer. This book was released on 2012-10-30 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Barry Trost: Transition metal catalyzed allylic alkylation.- Jeffrey W. Bode: Reinventing Amide Bond Formation.- Naoto Chatani and Mamoru Tobisu: Catalytic Transformations Involving the Cleavage of C-OMe Bonds.- Gregory L. Beutner and Scott E. Denmark: The Interplay of Invention, Observation and Discovery in the Development of Lewis Base Activation of Lewis Acids for Catalytic Enantioselective Synthesis.- David R. Stuart and Keith Fagnou: The Discovery and Development of a Palladium(II)-Catalyzed Oxidative Cross-Coupling of Two Unactivated Arenes.- Lukas Gooßen and Käthe Gooßen: Decarboxylative Cross-Coupling Reactions.- A. Stephen K. Hashmi: Gold-Catalyzed Organic Reactions.- Ben List: Developing Catalytic Asymmetric Acetalizations.- Steven M. Bischof, Brian G. Hashiguchi, Michael M. Konnick, and Roy A. Periana: The De NovoDesign of CH Bond Hydroxylation Catalysts.- Benoit Cardinal-David, Karl A. Scheidt: Carbene Catalysis: Beyond the Benzoin and Stetter Reactions.- Kenso Soai and Tsuneomi Kawasaki: Asymmetric autocatalysis of pyrimidyl alkanol.- Douglas C. Behenna and Brian M. Stoltz: Natural Products as Inspiration for Reaction Development: Catalytic Enantioselective Decarboxylative Reactions of Prochiral Enolate Equivalents. Hisashi Yamamoto: Acid Catalysis in Organic Synthesis.
Book Synopsis Economic Synthesis of Heterocycles by : Xiao-Feng Wu
Download or read book Economic Synthesis of Heterocycles written by Xiao-Feng Wu and published by Royal Society of Chemistry. This book was released on 2014-05-01 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterocycle synthesis is one of the largest areas of modern organic chemistry. Heterocycles have a broad range of applications including pharmaceuticals, agrochemicals and dyes, and are the core structure to around 90% of naturally-occurring molecules. Transition metal catalysts have become favoured in heterocycle synthesis, not least because of their low cost, but also due to their relatively low environmental toxicity and biocompatibility. This book presents an overview of the state-of-the-art in transition metal catalysis for heterocycle synthesis. Each metal is discussed in turn, presenting a comprehensive source of information on the use of zinc, iron, copper, cobalt, manganese, and nickel in a sustainable and economic manner. Referencing the latest primary literature, and authored by active researchers in the field, this book is a must-have resource for anyone wishing to undertake an economic and sustainable approach to heterocycle synthesis.
Book Synopsis Organic Synthesis Today and Tomorrow by : Barry M. Trost
Download or read book Organic Synthesis Today and Tomorrow written by Barry M. Trost and published by Elsevier. This book was released on 2017-01-31 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Synthesis: Today and Tomorrow covers the proceedings of the Third International Union of Pure and Applied Chemistry (IUPAC) Symposium on Organic Synthesis. The book covers topics that tackle relevant issues about organic chemistry. Comprised of 27 chapters, the book covers lectures that tackle topics pertaining organic chemistry. These topics include useful synthetic methods for general application; development of chemistry concepts for use in construction of molecular sub-assemblies; and interplay of synthetic methodology and the total synthesis of organic compounds. The book will be of great interest to scientists, such as biochemists who are concerned with the advances in organic chemistry.
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