Download or read book Catalytic Oxidation of Hydrocarbons by Dinuclear Iron Complexes written by and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our efforts during the past eight months were directed towards characterizing synthetic complexes that model the electronic and reactivity properties of the active site of methane monooxygenase (MMO), a metalloenzyme found in methanotrophic bacteria responsible for the biological oxidation of methane to methanol. We have investigated the structural/electronic and reactivity properties of a series of dinuclear model complexes that can function as oxygen atom transfer catalysts. In particular, our studies focused on [Fe[sup 2+][sub 2](H[sub 2]Hbab)[sub 2](N-MeIm)[sub 2]], its DMF solvated form, [Fe[sup 2+][sub 2](H[sub 2]Hbab)[sub 2](DMF)[sub 2](MeIm)], and the mixed valent species [Fe[sup 2+]Fe[sup 3+](H[sub 2]Hbab)[sub 2](DMF)[sub 4]][sup +], (H[sub 4]Hbab = 1,2-bis(2-hydroxybenzamido) benzene). We have also examined [Fe[sup 3+][sub 2](H[sub 2]Hbab)[sub 2](DMF)[sub 4]][sup 2+], [Fe[sup 3+][sub 2](H[sub 2]Hbab)[sub 2](OMe)[sub 2]], and [mu]-oxo-[Fe[sup 3+][sub 2](H[sub 2]Hbab)[sub 2](DMF)[sub 2]], which are unable to act as oxygen atom transfer catalysts.

Download or read book Catalytic Oxidation of Hydrocarbons by Dinuclear Iron Complexes Progress Report written by and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our efforts during the past eight months were directed towards characterizing synthetic complexes that model the electronic and reactivity properties of the active site of methane monooxygenase (MMO), a metalloenzyme found in methanotrophic bacteria responsible for the biological oxidation of methane to methanol. We have investigated the structural/electronic and reactivity properties of a series of dinuclear model complexes that can function as oxygen atom transfer catalysts. In particular, our studies focused on [Fe{sup 2+}2(H2Hbab)2(N-MeIm)2], its DMF solvated form, [Fe{sup 2+}2(H2Hbab)2(DMF)2(MeIm)], and the mixed valent species [Fe{sup 2+}Fe{sup 3+}(H2Hbab)2(DMF)4], (H4Hbab = 1,2-bis(2-hydroxybenzamido) benzene). We have also examined [Fe{sup 3+}2(H2Hbab)2(DMF)4]{sup 2+}, [Fe{sup 3+}2(H2Hbab)2(OMe)2], and [mu]-oxo-[Fe{sup 3+}2(H2Hbab)2(DMF){sub 2]}, which are unable to act as oxygen atom transfer catalysts.

Download or read book Catalytic Activation of Dioxygen by Metal Complexes written by László I. Simándi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: The activation of dioxygen by metal ions has both synthetic potential and biological relevance. Dioxygen is the cleanest oxidant for use in emission-free technologies to minimize pollution of the environment. The book gives a survey of those catalyst systems based on metal complexes which have been discovered and studied in the last decade. They activate molecular oxygen and effect the oxidation of various organic compounds under mild conditions. Much of the recent progress is due to a search for biomimetic catalysts that would duplicate the action of metalloenzymes. Mechanistic aspects are emphasized throughout the book. An introductonary chapter reviews the chemistry of transition metal dioxygen complexes, which are usually the active intermediates in the catalytic reactions discussed. Separate chapters are devoted to oxidation of saturated, unsaturated and aromatic hydrocarbons, phenols, catechols, oxo-compounds, phosphorus, sulfur and nitrogen compounds.

Download or read book The Activation of Dioxygen and Homogeneous Catalytic Oxidation written by D.H.R. Barton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph consists of the proceedings of the Fifth International Symposium on the Activation of Dioxygen and Homogeneous Catalytic Oxidation, held in College Station, Texas, March 14-19, 1993. It contains an introductory chapter authored by Professors D. H. R. Barton and D. T. Sawyer, and twenty-nine chapters describing presentations by the plenary lecturers and invited speakers. One of the invited speakers, who could not submit a manuscript for reasons beyond his control, is represented by an abstract of his lecture. Also included are abstracts of forty-seven posters contributed by participants in the symposium. Readers who may wish to know more about the subjects presented in abstract form are invited to communicate directly with the authors of the abstracts. This is the fifth international symposium that has been held on this subject. The first was hosted by the CNRS, May 21-29, 1979, in Bendor, France (on the Island of Bandol). The second meeting was organized as a NATO workshop in Padova, Italy, June 24-27, 1984. This was followed by a meeting in Tsukuba, Japan, July 12-16, 1987. The fourth symposium was held at Balatonfured, Hungary, September 10-14, 1990. The sixth meeting is scheduled to take place in Delft, The Netherlands (late Spring, 1996); the organizer and host will be Professor R. A. Sheldon.

Download or read book Iron and Vanadium Complexes for the Catalytic Oxidation of Hydrocarbons written by Laura González Cuervo and published by . This book was released on 2003 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Catalytic Activation of Dioxygen by Metal Complexes written by L. I. Simándi and published by Springer Science & Business Media. This book was released on 2003-01-31 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: The catalytic activation of dioxygen continues to attract interest both due to its biological importance and synthetic potential. Metalloenzymes play crucial roles in metabolism by living organisms. The modelling of metalloenzymes by biomimetic metal complexes helps the search for useful oxidation catalysts and the understanding of their mechanisms of operation. Dioxygen is also the oxidant of choice in emission-free technologies aimed at minimising pollution of the environment, in line with the green chemistry requirements. This volume is devoted to recent progress in the field of catalytic oxidations using ruthenium, copper, iron, gold, cobalt and other complexes. Products and mechanistic aspects are given special emphasis throughout the book.

Download or read book Biomimetic Oxidations Catalyzed By Transition Metal Complexes written by Bernard Meunier and published by World Scientific. This book was released on 2000-03-08 with total page 697 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the classic work Metal-Catalyzed Oxidations of Organic Compounds (edited by R A Sheldon and J K Kochi, 1991), no book has been devoted to advances in the field of biomimetic oxidations, which was created nearly 18 years ago. This expanding research field is covered in this volume. All the different aspects of the modeling of oxidations catalyzed by metalloenzymes are dealt with.This invaluable book will be useful to postgraduates as well as researchers in academia and industry, and will also benefit second year university students.

Download or read book Hydrocarbon Oxidation by Alkylperoxo Complexes of Tervalent Iron and Cobalt written by Cattien Van Nguyen and published by . This book was released on 1996 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selective Catalytic Hydrocarbons Oxidation written by Ludmila I. Matienko and published by Nova Science Publishers. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The different methods for enhancing the catalytic activity of transition metal complexes in hydrocarbon (particularly, alkylarene) oxidations with dioxygen are briefly discussed. The role played by H-bonds in mechanisms of homogeneous catalysis is also analysed. Furthermore, the authors propose a strategy of controlling the catalytic activity of Fe(II,III)(acac)nL2 complexes (L2 = R4NBr or 18C6) by adding H2O to small concentrations. In addition, the activity of Ni, Fe, and Co catalysts in microsteps of chain initiation (O2 activation), and propagation (Cat + RO2?) in the radical chain process of ethylbenzene oxidation is assessed by original method offered by authors. New concepts of mechanism of chain process of hydrocarbon oxidations with dioxygen, catalysed with transition metal complexes, participation of catalysts in microsteps of complicated hydrocarbon oxidation, activity M-O2 (M = Co, Ni, Fe) complexes in different oxidation reactions are briefly stated, and the self-assembled (self-organised) systems mediated by transition metals are briefly considered in connection with increasing research interest in chemical transformations with use of these systems.

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 Mechanism Based Design of Green Oxidation Catalysts written by and published by . This book was released on 2015 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In modern era of scarce resources, developing chemical processes that can eventually generate useful materials and fuels from readily available, simple, cheap, renewable starting materials is of paramount importance. Small molecules, such as dioxygen, dinitrogen, water, or carbon dioxide, can be viewed as ideal sources of oxygen, nitrogen, or carbon atoms in synthetic applications. Living organisms perfected the art of utilizing small molecules in biosynthesis and in generating energy; photosynthesis, which couples carbohydrate synthesis from carbon dioxide with photocatalytic water splitting, is but one impressive example of possible catalytic processes. Small molecule activation in synthetic systems remains challenging, and current efforts are focused on developing catalytic reactions that can convert small molecules into useful building blocks for generating more complicated organic molecules, including fuels. Modeling nature is attractive in many respects, including the possibility to use non-toxic, earth-abundant metals in catalysis. Specific systems investigated in our work include biomimetic catalytic oxidations with dioxygen, hydrogen peroxide, and related oxygen atom donors. More recently, a new direction was been also pursued in the group, fixation of carbon dioxide with transition metal complexes. Mechanistic understanding of biomimetic metal-catalyzed oxidations is critical for the design of functional models of metalloenzymes, and ultimately for the rational synthesis of useful, selective and efficient oxidation catalysts utilizing dioxygen and hydrogen peroxide as terminal oxidants. All iron oxidases and oxygenases (both mononuclear and dinuclear) utilize metal-centered intermediates as reactive species in selective substrate oxidation. In contrast, free radical pathways (Fenton chemistry) are common for traditional inorganic iron compounds, producing hydroxyl radicals as very active, non-selective oxidants. Recent developments, however, changed this situation. Growing families of synthetic iron complexes that resemble active sites of metalloenzymes produce metal-based intermediates (rather than hydroxyl radicals) in reactions with oxygen donors. These complexes are very promising for selective oxygen and peroxide activation. In order to understand the mechanisms of metal-based small molecule activation, kinetically competent metal-oxygen intermediates must be identified. One of the grand challenges identified by the Department of Energy workshop "Catalysis for Energy" is understanding mechanisms and dynamics of catalyzed reactions. The research summarized herein focuses on detailed characterization of the formation and reactivity of various iron-peroxo- and iron-oxo intermediates that are involved in catalysis. Rates of rapid reactions were studied at low temperatures by a specialized technique termed cryogenic stopped-flow spectrophotometry. These measurements identified reaction conditions which favor the formation of catalytically competent oxidants. Chemical structures of reactive complexes was determined, and new, efficient catalysts for hydrocarbon oxidation were synthesized. Importantly, these catalysts are selective, they promote oxidation of hydrocarbons at a specific site. The catalysts are also efficient and robust, hundreds of cycles of substrate oxidation occur within minutes at room temperature. Furthermore, they enable utilization of environmentally friendly oxidants, such as hydrogen peroxide, which produces water as the only byproduct. Mechanistic insights uncovered the role of various acid-containing additives in catalytic oxidations. Proton delivery to the active catalytic sites facilitated oxidations, similarly to the catalytic pathways in metal-containing enzymes. Under certain conditions, two metals in one complex can act in concert, modeling the reactivity of a bacterial enzyme which converts methane into methanol. In related studies, a family of nickel complexes that react with carbon ...

Download or read book Advances in Inorganic Chemistry written by Rudi van Eldik and published by Elsevier. This book was released on 2006-01-18 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Inorganic Chemistry Volume 58 focuses on homogeneous biomimetic oxidation catalysis. Contributions by leading experts in the field cover important advances in inorganic and bioinorganic chemistry. Contributions include diversity-based approaches to selective biomimetic oxidation catalysis; the selective conversion of hydrocarbons with H2O2 using biomimetic non-heme iron and manganese oxidation catalysis; DNA oxidation by copper and manganese complexes; influences of the ligand in copper-dioxygen complex-formation and substrate oxidations; biomimetic oxidations by dinuclear and trinuclear copper complexes. In the final contribution the authors focus on green oxidation of alcohols using biomimetic copper complexes and enzymes as catalysts. Volume 58 provides another welcomed addition to the widely acclaimed series, Advances in Inorganic Chemistry.* Includes new information on the important advances in inorganic and bioinorganic chemistry * Each chapter is fully referenced * Contains comprehensive reviews written by leading experts in the field

Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Oxidation of Carboxylic Acids Using Iron III Complexes written by Adeline Fournier and published by . This book was released on 2004 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Oxidation of Hydrocarbons written by Michael David Pawson and published by . This book was released on 2000 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Iron N Heterocyclic Carbene Complexes and Their Application in the Oxidation Catalysis of Hydrocarbons written by Andreas Daniel Raba and published by . This book was released on 2014 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Activation and Catalytic Reactions of Saturated Hydrocarbons in the Presence of Metal Complexes written by A.E. Shilov and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: hemistry is the science about breaking and forming of bonds between atoms. One of the most important processes for organic chemistry is breaking bonds C–H, as well as C–C in various compounds, and primarily, in hydrocarbons. Among hydrocarbons, saturated hydrocarbons, alkanes (methane, ethane, propane, hexane etc. ), are especially attractive as substrates for chemical transformations. This is because, on the one hand, alkanes are the main constituents of oil and natural gas, and consequently are the principal feedstocks for chemical industry. On the other hand, these substances are known to be the less reactive organic compounds. Saturated hydrocarbons may be called the “noble gases of organic chemistry” and, if so, the first representative of their family – methane – may be compared with extremely inert helium. As in all comparisons, this parallel between noble gases and alkanes is not fully accurate. Indeed the transformations of alkanes, including methane, have been known for a long time. These reactions involve the interaction with molecular oxygen from air (burning – the main source of energy!), as well as some mutual interconversions of saturated and unsaturated hydrocarbons. However, all these transformations occur at elevated temperatures (higher than 300–500 °C) and are usually characterized by a lack of selectivity. The conversion of alkanes into carbon dioxide and water during burning is an extremely valuable process – but not from a chemist viewpoint.