Download or read book Oxygen and Nitrogen Group Transfers in Aryl Nitroso Iron Complexes written by Maryam Habibian and published by . This book was released on 2010 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transition metal complexes containing imido ligands (M=NR) are an important class of coordination compounds implicated in nitrogen-group-transfer reactions such as aziridination. The present thesis investigates the formation of iron-imido complexes via deoxygenation of iron-nitroso complexes that have a nitroso (RN=O) functionality tethered to their main ligand framework. This process is at the heart of important oxygen-atom- transfer (OAT) reactions such as the epoxidation of alkenes or the hydroxylation of organic substrates. For this purpose, the new pentadentate monoanionic ligand BPAEBNHOH was synthesized and disproportionated by Fe(II) salts to yield N-bonded monomeric iron-nitroso complexes [Fe(II)BPAEBNO(OAc)] (1) and [Fe(II)BPAEBNO(MeCN)](OTf) (2) as well as the iron-amine complex [Fe(II)BPAEBNH2(OAc)]. These complexes were characterized by X-ray crystallography and spectroscopic techniques. Complexes (1) and (2) were found to be able to perform OAT to phosphine reagents (PR3) in moderate to high yields. Although not isolated, iron-iminophosphorane (M-N=PR3) compounds were identified as the main products of the reaction. Detailed kinetic and mechanistic studies of this reaction suggest that the mechanism does not involve a simple rate law. Control experiments and comparisons with the literature suggest that the mechanism involves the replacement of acetate and acetonitrile ligands with a phosphine ligand, before the nitroso group is deoxygenated. These results suggest the formation of an iron-imido intermediate, prior to its trapping by phosphine reagents.
Download or read book Inter and Intramolecular Aryl Nitroso Copper Mediated Redox Reactions written by Farshid Effaty and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The redox conversions of hydroxylamine (NH2OH) are biologically relevant because this molecule serves as a nitric oxide donor in mammals under certain conditions. The analogous arylhydroxylamine compounds (ArNHOH, where Ar is an aryl group) display similar chemistry, with the advantage of fewer side-reactions. Thus, there has recently been increased interest into investigations of the reactivity of arylhydroxylamines with metal complexes as mimics of the biologically relevant reactions of NH2OH with copper or iron. Oxidation of arylhydroxylamines yields nitrosoarenes (ArNO), which are structurally and electronically versatile redox-active molecules. Their corresponding metal complexes are stable mimics of O2 and HNO complexes transiently found in nature and catalytic cycles. This stability allows for a systematic survey of the structure and redox state of ArNO metal complexes. The metal-mediated transformations between ArNHOH, ArNO and other relevant nitrogen-based groups, however, are not well understood. Herein, in two different reports, we address the reactivity of ArNHOH and ArNO groups with copper complexes. In the first study, a series of complexes is prepared by self-assembly of copper(I) precursors and arylnitroso species. The nature of the copper(I) supporting ligand (bi-, tri- or tetradentate, as well as secondary vs. tertiary amine donors) and the electronic nature of the arylnitroso species (electron-donating or withdrawing substituents) are varied. The stoichiometry of the reaction, the topology, and the electronic properties of the adducts are characterized by UV-Vis spectroscopy, single crystal X-ray diffraction, and DFT methods. The more electron-rich ligands and the more electron-poor arylnitroso species lead to an inner-sphere electron transfer and formation of copper(II)-(arylnitrosyl radical) complexes bearing a linkage topology that depends on the denticity of the supporting ligand. These results provide a canvas by which to predict the products of similar self-assembled redox reactions. In the second study, the synthesis of an unprecedented copper(I)-arylhydroxylamine complex is reported. The reactivity of the arylhydroxylamine is arrested by the presence of an intramolecular hydrogen bond that stabilizes the weakly bound hydroxylamine. Upon two-electron oxidation, a copper(II)-(arylnitrosyl radical) complex is formed, which crystallizes as a copper(I) species with an uncoordinated arylnitroso function. This validates that such ligands may enable ligand redox chemistry and hemilability in copper complexes. Such tethered arylnitroso complexes present new opportunities for two-electron chemistry in earth-abundant metal catalysis. In a nutshell, this thesis highlights unique electron-transfer events and redox conversions about the N-O bond in copper complexes. The main finding is the characterization of an intermediate redox state in-between ArNHOH and ArNO, namely the arylnitrosyl radical anion, ArNO-, which is stable only when coordinated.
Download or read book Biodegradation of Nitroaromatic Compounds written by Jim C. Spain and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past five years increased awareness of environmental contamination by nitroaromatic compounds has led to a dramatic increase in research on their biodegradation. The resulting discoveries have markedly extended our understanding of degradation mecha nisms and pathways in bacteria and fungi. Futhermore, this new basic knowledge promises the development of field applications of biodegradation systems for nitroaromatic com pounds. In May of 1994, an International Symposium on the Biodegradation of Nitro aromatic Compounds was held in Las Vegas, Nevada. This symposium brought together the scientists at the frontiers of research into the biodegradation of nitro aromatic compounds. The invited speakers were asked to review their area of expertise and write a critical, comprehensive synthesis of their work and related work by others. This book is the result of their efforts. The emphasis of the reviews is on basic research in biodegradation and biotransfor mation. Therefore, the reactions of nitroaromatic compounds in plants, animals, bacteria, fungi, soil, and even nonbiological systems are considered. The goal of the work is to provide the reader with an appreciation of the tremendous range of possibilities for metabolism of aromatic nitro compounds and the experimental approaches used to understand them. This volume should be of interest to biochemists, microbiologists, engineers, toxicologists, and anyone interested in the behavior of synthetic chemicals in the environment or in living systems. Furthermore, a variety of commercial applications can be envisioned for some of the reactions described here.
Download or read book Aromatic C nitroso Compounds written by Hrvoj Vančik and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed to collect and review the research covering main directions in investigations of aromatic nitroso compounds in last decades, and to present both, the academic aspects of this chemistry, as well as the open field of its applicability. The book is divided in five chapters. The basic structural properties of the nitroso aromatic molecules are described in the first chapter. The second chapter is an overview of the methods of preparations of aromatic nitroso and polynitroso compounds, including classical synthetic methods and some new preparative approaches. The third part deals with the physico-chemical properties of nitroso aromates and azodioxides, its structure, crystallography, quantum chemical calculations, spectroscopy, typical reactions, and especially it is focused on the dimerizations in the solid-state. In the fourth chapter is represented organometallic chemistry of nitroso aromatic molecules and its applications in catalysis. The last part of the book deals with the behavior of this class of compounds in the biological systems, reactions with biomolecules and the use in toxicology.
Download or read book Metal Catalyzed Oxidations of Organic Compounds written by Roger Sheldon and published by Elsevier. This book was released on 2012-12-02 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-Catalyzed Oxidations of Organic Compounds: Mechanistic Principles and Synthetic focuses on the oxidative transformations of functional groups. This book explores oxidation as being extensively used in the laboratory synthesis of fine organic chemicals and in the manufacture of large-volume petrochemicals. Organized into two parts encompassing 13 chapters, this book starts with an overview of the mechanistic principles of oxidation–reduction in biochemical, organic, and inorganic systems. This text then proceeds with a discussion of the use of molecular oxygen, hydrogen peroxide, and alkyl hydroperoxides as primary oxidants. Other chapters explore stoichiometric oxidations with metal oxidants, which include permanganate and chromic acid. This book discusses as well the synthetic applications of catalytic oxidations as well as the technology of petrochemical oxidation. The final chapter deals with the autoxidations of sulfur, phosphorus, and nitrogen compounds. This book is intended for chemists involved in organic synthesis, catalysis, and organometallic chemistry, both in academic institutions and in industrial laboratories.
Download or read book Basic Principles of Organic Chemistry written by John D. Roberts and published by . This book was released on 1977 with total page 1596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction what is organic chemistry all about?; Structural organic chemistry the shapes of molecules functional groups; Organic nomenclature; Alkanes; Stereoisomerism of organic molecules; Bonding in organic molecules atomic-orbital models; More on nomenclature compounds other than hydrocarbons; Nucleophilic substitution and elimination reactions; Separation and purification identification of organic compounds by spectroscopic techniques; Alkenes and alkynes. Ionic and radical addition reactions; Alkenes and alkynes; Oxidation and reduction reactions; Acidity or alkynes.
Download or read book Canadian Journal of Chemistry written by and published by . This book was released on 1994 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Book of Abstracts written by American Chemical Society. Meeting and published by . This book was released on 1986 with total page 1350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the American Chemical Society written by American Chemical Society and published by . This book was released on 1974 with total page 1128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Society are included in v. 1-59, 1879-1937.
Download or read book Celebrating the Work of Prof Sourav Pal Computational Approaches in Catalysis written by Soumyajit Roy and published by Frontiers Media SA. This book was released on 2022-05-25 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organophosphorus Chemistry written by David W. Allen and published by Royal Society of Chemistry. This book was released on 2012 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organophosphorus Chemistry provides a comprehensive and critical review of the recent literature. Coverage includes phosphines and their chalcogenides, phosphonium salts, low coordination number phosphorus compounds, penta- and hexa-coordinated compounds, quiquevalent phosphorus acids, nucleotides and nucleic aicds, ylides and related compounds, phosphazenes and the application of physical methods in the study of organophosphorus compounds.
Download or read book Organometallic Chemistry written by M Green and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organometallic chemistry is an interdisciplinary science which continues to grow at a rapid pace. Although there is continued interest in synthetic and structural studies the last decade has seen a growing interest in the potential of organometallic chemistry to provide answers to problems in catalysis synthetic organic chemistry and also in the development of new materials. This Specialist Periodical Report aims to reflect these current interests reviewing progress in theoretical organometallic chemistry, main group chemistry, the lanthanides and all aspects of transition metal chemistry. 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.
Download or read book Pandex Current Index to Scientific and Technical Literature written by and published by . This book was released on 1971 with total page 1334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index Chemistry E O written by University Microfilms International and published by . This book was released on 1984 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1989 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quarterly Journal of the Chemical Society of London written by Chemical Society (Great Britain) and published by . This book was released on 1971 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:
