New Avenues for Redox-active Ligands

New Avenues for Redox-active Ligands
Author: Daniël Laurens Johannes Broere
Publisher:
Total Pages: 194
Release: 2016
Genre:
ISBN: 9789402801767

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"Many homogeneous and heterogeneous catalyst systems contain one or more transition metals. The widespread employment of these metals as catalysts is ascribed to their accessible d-orbitals to activate chemical bonds, and the ability to undergo metal-based oxidation state changes to facilitate desirable chemical transformations. The fine-tuning of homogeneous catalyst systems is commonly achieved by the coordination of (spectator) ligands, which can vary greatly in steric bulk or electron-donating ability. For such ligands the energy required for oxidation or reduction of the ligand is much bigger than that needed to change the oxidation state of the metal. Accordingly, the redox changes required for bond making and breaking processes typically occur at the metal center. Redox-active ligands have more energetically accessible levels for reduction and/or oxidation upon coordination to a metal. As a result, either solely ligand-centered redox processes can occur, with the metal center remaining in the same oxidation state, or more diffuse scenarios, wherein both the ligand and metal change oxidation states in a synergistic fashion. Although initially thought of as a spectroscopic curiosity, redox-active ligands are nowadays recognized for their ability to induce new reactivity at metal centers. Within this thesis we have shown that o-aminophenol derived architectures can give fascinating spectroscopic properties upon coordination to late transition metals. Moreover, these ligands can expand upon a metal's "common" reactivity by actively taking part in intramolecular redox processes. We have demonstrated that intramolecular single-electron transfer processes can facilitate homolytic bond cleaving reactions and the generation of reactive nitrogen-centered radicals."--Samenvatting auteur.

Redox-Active Ligands

Redox-Active Ligands
Author: Marine Desage-El Murr
Publisher: John Wiley & Sons
Total Pages: 373
Release: 2024-02-05
Genre: Science
ISBN: 3527348506

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Redox-Active Ligands Authoritative resource showcasing a new family of ligands that can lead to better catalysts and promising applications in organic synthesis Redox-Active Ligands gives a comprehensive overview of the unique features of redox-active ligands, describing their structure and synthesis, the characterization of their coordination complexes, and important applications in homogeneous catalysis. The work reflects the diversity of the subject by including ongoing research spanning coordination chemistry, organometallic chemistry, bioinspired catalysis, proton and electron transfer, and the ability of such ligands to interact with early and late transition metals, lanthanides, and actinides. The book is divided into three parts, devoted to introduction and concepts, applications, and case studies. After the introduction on key concepts related to the field, and the different types of ligands and complexes in which ligand-centered redox activity is commonly observed, mechanistic and computational studies are described. The second part focuses on catalytic applications of redox-active complexes, including examples from radical transformations, coordination chemistry and organic synthesis. Finally, case studies of redox-active guanidine ligands, and of lanthanides and actinides are presented. Other specific sample topics covered include: An overview of the electronic features of redox-active ligands, covering their historical perspective and biological background The versatility and mode of action of redox-active ligands, which sets them apart from more classic and tunable ligands such as phosphines or N-heterocyclic carbenes Preparation and catalytic applications of complexes of stable N-aryl radicals Metal complexes with redox-active ligands in H+/e- transfer transformations By providing up-to-date information on important concepts and applications, Redox-Active Ligands is an essential reading for researchers working in organometallic and coordination chemistry, catalysis, organic synthesis, and (bio)inorganic chemistry, as well as newcomers to the field.

Modes of Cooperative Effects in Dinuclear Complexes

Modes of Cooperative Effects in Dinuclear Complexes
Author: Philippe Kalck
Publisher: Springer Nature
Total Pages: 241
Release: 2023-05-23
Genre: Science
ISBN: 3031322509

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This book presents recent advances in dinuclear complexes in which the metal-metal cooperative effect operates for obtaining substrate activation and high performance catalysts. Catalysis continues to be a fast expanding area to design efficient tools in synthesis and in industrial chemistry. It allows performing syntheses with short reaction times, atom economy, reduced consumption of energy and loss of reagents, and low level of wastes. Dinuclear complexes are known to be more efficient than the mononuclear analogues for the reaction rates and the selectivities. This book analyses the latest research, focusing on the key concepts, in building and using these dinuclear complexes. The book is aimed at researchers, graduate students and chemists at all levels in academia and industry.

Redox-Active Therapeutics

Redox-Active Therapeutics
Author: Ines Batinić-Haberle
Publisher: Springer
Total Pages: 709
Release: 2016-10-13
Genre: Science
ISBN: 3319307053

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This essential volume comprehensively discusses redox-active therapeutics, focusing particularly on their molecular design, mechanistic, pharmacological and medicinal aspects. The first section of the book describes the basic aspects of the chemistry and biology of redox-active drugs and includes a brief overview of the redox-based pathways involved in cancer and the medical aspects of redox-active drugs, assuming little in the way of prior knowledge. Subsequent sections and chapters describe more specialized aspects of central nervous system injuries, neurodegenerative diseases, pain, radiation injury and radioprotection (such as of brain, lungs, head and neck and erectile function) and neglected diseases (e.g., leishmaniasis). It encompasses several major classes of redox-active experimental therapeutics, which include porphyrins, salens, nitrones, and most notably metal-containing (e.g., Mn, Fe, Cu, Zn, Sb) drugs as either single compounds or formulations with nanomaterials and quantum dots. Numerous illustrations, tables and figures enhance and complement the text; extensive references to relevant literature are also included. Redox-Active Therapeutics is an invaluable addition to Springer’s Oxidative Stress in Applied Basic Research and Clinical Practice series. It is essential reading for researchers, clinicians and graduate students interested in understanding and exploring the Redoxome—the organism redox network—as an emerging frontier in drug design, redox biology and medicine.

Metal-Ligand Co-operativity

Metal-Ligand Co-operativity
Author: Gerard van Koten
Publisher: Springer Nature
Total Pages: 451
Release: 2021-03-29
Genre: Science
ISBN: 3030689166

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This book provides researchers in the fields of organic chemistry, organometallic chemistry and homogeneous catalysis with an overview of significant recent developments in the area of metal-ligand cooperativity, with a focus on pincer architectures. The various contributions highlight the widespread impact of M–L co-operativity phenomena on modern organometallic chemistry and catalyst development. The development of efficient and selective catalytic transformations relies on the understanding and fine control of the various elementary reactions that constitutes a catalytic cycle. Co-operative ligands, which actively participate in bond making and bond breaking together to the metal they support, open up new avenues in this area. In particular, buttressing a weak or reactive metal-ligand bond by flanking coordinating arms in a pincer ligand design is proving a versatile strategy to access robust metal complexes that exhibit unusual and selective reactivity patterns.

Advances in Organometallic Chemistry

Advances in Organometallic Chemistry
Author: Pedro J. Perez
Publisher: Academic Press
Total Pages: 316
Release: 2020-03-03
Genre: Science
ISBN: 0128206918

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Advances in Organometallic Chemistry, Volume 73, the latest release in this longstanding serial, is known for its comprehensive coverage of topics in organometallic synthesis, reactions, mechanisms, homogeneous catalysis, and more. It is ideal for a wide range of researchers involved in organometallic chemistry, including synthetic protocols, mechanistic studies and practical applications. Specific chapters in this new release include Metal carbonyl promoted multicomponent coupling of alkyne for synthesis of heterocyclic compounds, Group 10 metal(0) complexes stabilized by phosphorus and carbon donor ligands, Synthesis of Nitrogen-containing Molecules via Transition Metal-Catalyzed Reactions on Isoxazoles, Anthraniils and Benzoisoxazoles, and more. Contains contributions from leading authorities in the field of organometallic chemistry Covers topics in organometallic synthesis, reactions, mechanisms, homogeneous catalysis, and more Informs and updates readers on the latest developments in the field Carefully edited to provide easy-to-read material

Early Drug Development, 2 Volume Set

Early Drug Development, 2 Volume Set
Author: Fabrizio Giordanetto
Publisher: John Wiley & Sons
Total Pages: 810
Release: 2018-12-10
Genre: Science
ISBN: 3527341498

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This one-stop reference systematically covers key aspects in early drug development that are directly relevant to the discovery phase and are required for first-in-human studies. Its broad scope brings together critical knowledge from many disciplines, ranging from process technology to pharmacology to intellectual property issues. After introducing the overall early development workflow, the critical steps of early drug development are described in a sequential and enabling order: the availability of the drug substance and that of the drug product, the prediction of pharmacokinetics and -dynamics, as well as that of drug safety. The final section focuses on intellectual property aspects during early clinical development. The emphasis throughout is on recent case studies to exemplify salient points, resulting in an abundance of practice-oriented information that is usually not available from other sources. Aimed at medicinal chemists in industry as well as academia, this invaluable reference enables readers to understand and navigate the challenges in developing clinical candidate molecules that can be successfully used in phase one clinical trials.

Dehydrogenation Reactions with 3d Metals

Dehydrogenation Reactions with 3d Metals
Author: Basker Sundararaju
Publisher: Springer Nature
Total Pages: 307
Release: 2024-02-07
Genre: Science
ISBN: 3031489527

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In this book recent developments in dehydrogenation reactions catalyzed by 3d-metals are discussed. With continue efforts to develop sustainable chemical production the discovery of new catalysts and catalytic procedures for (de)hydrogenation reactions are a subject of great interest to the chemistry community. Additionally, (de)hydrogenation reactions enable the creation of closed-loop production cycles that support a circular economy. The chapters presented include the synthesis of heterocycles and tandem-multicomponent (three or more) reactions through dehydrogenative strategy, as well as the conversion of ethanol to n-butanol, higher oxidized hydrocarbons like acids, ester, amides from alcohols, α-alkylation of amines, ketones, and amides with alcohols and mechanistic understanding of dehydrogenation reactions with high-valent metals. With contributions from experts in the field, the book is a valuable resource for scholars working in the field of organometallic chemistry, catalysis, medicinal chemistry, as well as researchers in the industry.

Organometallic Chemistry

Organometallic Chemistry
Author: Nathan J Patmore
Publisher: Royal Society of Chemistry
Total Pages: 130
Release: 2022-12-14
Genre: Science
ISBN: 1839167718

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Providing an invaluable resource, this volume contains analysed, evaluated and distilled information on the latest in organometallic and coordination chemistry research and emerging fields. With continued increases in the variety of information available, researchers can find it difficult to keep up to date with the literature in their field. The reviews in this volume range in scope and include recent developments in homogeneous catalysis for the functionalization of carbon dioxide, early transition metal complexes and their uses in medicinal chemistry, homogeneous gold catalysis under microwave irradiation: a greener approach and properties of metal complexes of mesoionic carbenes. This volume is a key reference for researchers in academic and industrial settings.

Hydrogen Storage

Hydrogen Storage
Author: Thomas Zell
Publisher: Walter de Gruyter GmbH & Co KG
Total Pages: 391
Release: 2019-01-14
Genre: Science
ISBN: 3110536420

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Hydrogen is believed to be the energy source of the future, enabling zero-emission and efficient production of power. This comprehensive publication presents a broad spectrum of various chemical aspects of hydrogen storage. The authors also address global climate change issues, carbon dioxide sequestration problems and CO2-based hydrogen storage.