Download or read book PYRIDINIUM SALTS AS ELECTRON TRAPS written by Ilnur Khubaibullin and published by . This book was released on 2016 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two pyridinium salts capture an electron in a concerted fashion and retain it for tens of picoseconds. This process has been studied by ultrafast transient absorption spectroscopy. Further studies with other pyridinium salts and donors have been conducted in effort to determine the optimum geometry for electron capture and complex stabilization.
Download or read book PYRIDINIUM SALTS written by Nikolai Teyrulnikov and published by . This book was released on 2019 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first chapter of this dissertation is devoted to the investigation of the pimerization and photo-induced electron-transfer processes in the series of bis(pyridinium) alkane salts and covalently linked monoquat. The DFT analysis of bis(pyridinium) alkane systems allowed us to compare the energies of the different conformations of dications and radical cations of these salts formed upon single electron reduction which is important for the determination of the conformations that favor the formation of the dimer radical cation. The results of these calculations made an important contribution to the studies of pimerization in bis(pyridinium)alkane salts. Reduction of monomeric and covalently linked monoquat (1-methyl-4-(4-pyridyl)pyridinium) was assessed experimentally by means of Cyclic Voltammetry and transient absorption spectroscopy. A number of interesting observations were made to provide a basis for the improved design of novel photochemical DNA damaging agents that contain electron-poor pyridinium or monoquat `arms' able to undergo pimerization process. The second part of the dissertation covers the spontaneous aerobic catalyst-free transition from 1,1,2,2-tetrakis(N-methylpyridin-4-ium)ethane iodide to the corresponding epoxide (major product) and alkene (minor product). This reaction represents a rare transition from a substituted alkane to the epoxide. The mechanism of the reaction was proposed based on the intermediates and products characterization and further supported by the kinetic modeling. It was demonstrated that the oxidation proceeds through the formation of the air sensitive monomethine cyanine dye dimer. This reaction intermediate was involved in the production of the Reactive Oxygen Species (ROS) that are known to induce DNA damage. In light of this observation, the DNA toxicity of 1,1,2,2-tetrakis(N-methylpyridin-4-ium)ethane under aerobic aqueous conditions was examined. The results of this study are presented in the last chapter of the dissertation. DNA damage upon mixing of 1,1,2,2-tetrakis(N-methylpyridin-4-ium)ethane with DNA in air was demonstrated. This project has a promising potential for utilization in the areas of ROS-cancer treatment and biomedical research.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Reaction Mechanisms 2015 written by A. C. Knipe and published by John Wiley & Sons. This book was released on 2019-02-08 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Reaction Mechanisms 2015, the 51st annual volume in this highly successful and unique series, surveys research on organic reaction mechanisms described in the available literature dated 2015. The following classes of organic reaction mechanisms are comprehensively reviewed: Reaction of Aldehydes and Ketones and their Derivatives Reactions of Carboxylic, Phosphoric, and Sulfonic Acids and their Derivatives Oxidation and Reduction Carbenes and Nitrenes Nucleophilic Aromatic Substitution Electrophilic Aromatic Substitution Carbocations Nucleophilic Aliphatic Substitution Carbanions and Electrophilic Aliphatic Substitution Elimination Reactions Polar Addition Reactions Cycloaddition Reactions Molecular Rearrangements An experienced team of authors compile these reviews every year, so that the reader can rely on a continuing quality of selection and presentation.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Reaction Mechanisms 1978 written by A. C. Knipe and published by John Wiley & Sons. This book was released on 2008-04-30 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only book series to summarize the latest progress on organic reaction mechanisms, Organic Reaction Mechanisms, 1978 surveys the development in understanding of the main classes of organic reaction mechanisms reported in the primary scientific literature in 1978. The 14th annual volume in this highly successful series highlights mechanisms of stereo-specific reactions. Reviews are compiled by a team of experienced editors and authors, allowing advanced undergraduates, graduate students, postdocs, and chemists to rely on the volume's continuing quality of selection and presentation.
Download or read book Pyridine Metal Complexes Part 6A written by Desmond J. Brown and published by John Wiley & Sons. This book was released on 2009-09-15 with total page 2247 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Radiation Research written by E. M. Fielden and published by Taylor & Francis Group. This book was released on 1987 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemistry of Heterocycles written by Vishnu Ji Ram and published by Elsevier. This book was released on 2019-06-06 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chemistry of Heterocycles: Chemistry of Six to Eight Membered N,O, S, P and Se Heterocycles details the chemistry, behavior and potential of these important structures. The book presents a practical guide to international nomenclature, including discussions of fused ring systems, heteroatoms with abnormal valences, and bridged, spiro and polycyclic heterocycles. Three membered heterocycles are then the focus, along with their thermodynamic properties and importance in natural products, medicines, materials, and their unique aspects, such as strain, basicity and reactivity. Additional chapters cover 100 key heterocycle structures, from Azetidines, Pyrroles and Pyridines, to Benzoxepines and Oxocanes. Final chapters explore cutting-edge advances in the development of phosphorus and selenium based heterocycles. Provides clear, detailed information on each heterocyclic group, including structural features, such as ring strain, basicity, synthesis and reactivity towards electrophilic and nucleophilic reagents Highlights the latest advances in the field, including phosphorous and selenium-based heterocycles supported by numerous illustrations Includes details of functionalized heterocycles used as synthons for the construction of various arenes and heteroarenes
Download or read book Fossil Energy Update written by and published by . This book was released on 1985 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotope Titles written by and published by . This book was released on 1970-05 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Reagents for Organic Synthesis written by André B. Charette and published by John Wiley & Sons. This book was released on 2015-07-15 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heteroarenes are among the most prevalent structural units in natural products, pharmaceuticals, agrochemicals, and other compounds of scientific or commercial interest. In the last decade, a broad range of novel synthetic methods has been developed to not only facilitate construction of the heteroarene motif, but to enable its modification through direct C H functionalization. This Handbook describes 117 key reagents for selective heteroarene functionalization reactions, including both traditional and transition metal-catalyzed C H functionalization. Since these reactions typically involve one heteroarene, a coupling partner and a catalyst, the handbook not only focuses on the catalyst itself but also contains other key reaction species. All the information compiled in this volume is also available in electronic format on Wiley Online Library. The 117 reagents represented here are but a small fraction of the ca. 5,000 reagents available in the electronic Encyclopedia of Reagents for Organic Synthesis (e-EROS). e-EROS offers various search interfaces to locate reagents of interest, including chemical structure, substructure and reactions search modes. e-EROS is updated regularly with new and updated entries.
Download or read book Handbook of Polymer Synthesis written by Hans R. Kricheldorf and published by CRC Press. This book was released on 2004-11-27 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt: An in-depth review of important preparative methods for the synthesis and chemical modification of polymers, this authoritative second edition examines the advantages and limitations of various polymerization applications and procedures. It features new approaches and innovative strategies from the most prominent industry and academic laboratories,
Download or read book Non covalent Interactions in the Synthesis and Design of New Compounds written by Abel M. Maharramov and published by John Wiley & Sons. This book was released on 2016-05-03 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to overview the role of non-covalent interactions, such as hydrogen and halogen bonding, π-π, π-anion and electrostatic interactions, hydrophobic effects and van der Waals forces in the synthesis of organic and inorganic compounds, as well as in design of new crystals and function materials. The proposed book should allow to combine, in a systematic way, recent advances on the application of non-covalent interactions in synthesis and design of new compounds and functional materials with significance in Inorganic, Organic, Coordination, Organometallic, Pharmaceutical, Biological and Material Chemistries. Therefore, it should present a multi- and interdisciplinary character assuring a rather broad scope. We believe it will be of interest to a wide range of academic and research staff concerning the synthesis of new compounds, catalysis and materials. Each chapter will be written by authors who are well known experts in their respective fields.
Download or read book Russian Chemical Reviews written by and published by . This book was released on 2007 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactive Intermediate Chemistry written by Robert A. Moss and published by John Wiley & Sons. This book was released on 2004-01-07 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive Intermediate Chemistry presents a detailed and timely examination of key intermediates central to the mechanisms of numerous organic chemical transformations. Spectroscopy, kinetics, and computational studies are integrated in chapters dealing with the chemistry of carbocations, carbanions, radicals, radical ions, carbenes, nitrenes, arynes, nitrenium ions, diradicals, etc. Nanosecond, picosecond, and femtosecond kinetic realms are explored, and applications of current dynamics and electronic structure calculations are examined. Reactive Intermediate Chemistry provides a deeper understanding of contemporary physical organic chemistry, and will assist chemists in the design of new reactions for the efficient synthesis of pharmaceuticals, fine chemicals, and agricultural products. Among its features, this authoritative volume is: Edited and authored by world-renowned leaders in physical organic chemistry. Ideal for use as a primary or supplemental graduate textbook for courses in mechanistic organic chemistry or physical chemistry. Enhanced by supplemental reading lists and summary overviews in each chapter.
Download or read book Inorganic Biochemistry written by H A O Hill and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
