Download or read book Carbon Dioxide Activation by Metal Complexes written by Arno Behr and published by . This book was released on 1988 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activation of Carbon Dioxide by Pincer Supported Transition Metal Complexes written by Timothy J. Schmeier and published by . This book was released on 2013 with total page 260 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 2006-04-11 with total page 551 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.
Download or read book Catalytic Activation of Carbon Dioxide by Metal Complexes written by L. Vaska and published by . This book was released on 1988 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper summarizes some past and recent work from the author's laboratory on the reactions of carbon dioxide with metal complexes with the objective of suggesting the relevance of this research to some related biological systems. First, the various CO2-metal complex interactions in vivo and in vitro are briefly cited, followed by a description of the reversible activation of carbon dioxide by model rhodium and iridium compounds. Finally, recent results are presented on homogeneous catalytic hydrogenation/reduction of CO2 mediated by metal complexes, including a platinum cluster complex which catalyzes the carbon dioxide conversion at mild conditions. Keywords: Carbon dioxide, Metal complexes, Model compounds, Bicarbonato complexes, Homogeneous catalysis, Hydrogenation.
Download or read book First row Transition Metal Complexes for Electrochemical Carbon Dioxide Activation written by Niklas Werner Kinzel and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Dioxide as Chemical Feedstock written by Michele Aresta and published by John Wiley & Sons. This book was released on 2010-01-26 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the need for an up-to-date handbook, this ready reference closely investigates the use of CO2 for ureas, enzymes, carbamates, and isocyanates, as well as its use as a solvent, in electrochemistry, biomass utilization and much more. Edited by an internationally renowned and experienced researcher, this is a comprehensive source for every synthetic chemist in academia and industry.
Download or read book Activation Of Small Inorganic Molecules written by M.M. Taqui Khan and published by Elsevier. This book was released on 2012-12-02 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Homogeneous Catalysis by Metal Complexes, Volume I: Activation of Small Inorganic Molecules reviews and systematizes the chemistry of the metal ion activation of the small diatomic molecules. The book discusses the activation of molecular hydrogen, molecular oxygen, molecular nitrogen, carbon monoxide, and nitric oxide.
Download or read book Carbon Dioxide Activation by Metal Complexes written by Arno Behr and published by . This book was released on 1988 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Design and Synthesis of Complexes for the Activation of Carbon Dioxide written by R. Bou-Moreno and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes developments in the studies of the activation and use of carbon dioxide as a building block in synthesis by early transition metal complexes. The proposed route required the reaction of carbon dioxide with a metal-imido complex via a heterocumulene metathesis to produce an isocyanate. An attempt at the use of molybdenum-imido complexes for the process generated a novel low valent molybdenum bisimido complex with no success in the activation of carbon dioxide. Generation of simple 12-electron titanium-imido complexes showed successful heterocumulene metathesis with isocyanates to develop a novel methodology for the synthesis of carbodiimides and ureas. The studies of this methodology proved a fourmembered ring metallocycle was an intermediate and suggested the mechanism of the process as plausible, as well as showing the activation of carbon dioxide. Our studies were concluded by the generation and modification of titanium-imido complexes to synthesise families of complexes containing aromatic imido ligands, which showed no reactivity with carbon dioxide with the exception of the 2,6- diisopropylphenylimido ligand. Unsuccessful isolation of alkylimido titanium complexes impeded the generation of families of complexes. In situ generation of alkylimido titanium complexes showed activation of carbon dioxide to generate ureas, proposing two consecutive heterocumulene metatheses first with carbon dioxide and a second with the generated isocyanate. Studies with intermediates and comparisons with the generation of carbodiimides support this mechanism.
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 Enzymatic and Model Carboxylation and Reduction Reactions for Carbon Dioxide Utilization written by M Aresta and published by . This book was released on 1990-08-31 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activation of Carbon Dioxide and Dimerization of Terminal Acetylenes by Transition Metal Complexes written by Nianhong Liu and published by . This book was released on 1995 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activation of Carbon Dioxide by Formation of Metalloheterocycles and Metallocycles written by and published by . This book was released on 1995 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to find new ways to incorporate carbon dioxide into organic molecules by activation of the carbon dioxide within the coordination sphere of an electron rich transition metal complex. Achievements included the discovery that heteroallenes characteristically undergo reductive disproportionation with dianionic carbonyl metals and can add to electron rich - neutral carbonyl complexes such as W(eta(5)-C5H5)2(CO) to give metalloheterocycles. We have further observed that unsaturated ligands can be induced to couple with carbon dioxide by reducing the metal center so that it will activate the carbon dioxide, as exemplified by bis-carboxylation of the carbene or carbenoid ligand in the two electron reduction products of Fischer carbene complexes with phosphine substituents to give substituted malonates, and by endo carboxylation of the eta(4)arene in the Cr( -II) complex Cr(eta(4)-C6H6)(CO)32-. We have also prepared KCo(2,6- C6H3NC)4, the first example of a homoleptic isonitrile complex of a metal in a negative oxidation state and the antecedent for a new class of transition metal complexes. jg p.1.
Download or read book The Activation of Carbon Dioxide by the Transition Metal Complex Mer HRh CH2COMe PMe 3 3Cl written by Michael Lee Farmer and published by . This book was released on 1990 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Activation of Carbon Dioxide written by William M. Ayers and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Papers from a symposium sponsored by the Division of Colloid and Surface Chemistry at the 191st Meeting of the ACS, NYC, Apr. 1986. Discusses the need to develop catalytic reactions for converting CO2 to products such as methanol and methane. Topics range from general issues to theoretical treatments of carbon dioxide bonding followed by various catalytic approaches. Annotation(c) 2003 Book News, Inc., Portland, OR (booknews.com).
Download or read book Activation of Hydrogen and Carbon Monoxide by Transition Metal Complexes written by James G. Miller and published by . This book was released on 1985 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Binding Activation and Transformation of Carbon Dioxide Mediated by Anionic Metal Complexes written by Jared Scott Silvia and published by . This book was released on 2011 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vanadium nitride complex [Na][NV(N['Bu]Ar) 3] reacts with CO to produce the vanadium tris-anilide complex V(N['Bu]Ar)3 and NaNCO. This is the first example of complete denitrogenation of a termainal nitride complex with generation of a lower coordinate metal complex. This reactivity contrasts sharply with the reactivity of the niobium analogue, where the nitride anion complex [Na][NNb(N['Bu]Ar) 3] is synthesized from the reductive decarbonylation of the niobium(IV) isocyanate complex (OCN)Nb(N['Bu]Ar) 3. Electrochemical studies of the niobium(IV) and vanadium(IV) isocyanate (OCN)V(N['Bu]Ar) 3 complexes are presented. The reactivity of the vanadium carbamate complex [(THF) 2Na][O2CNV(N['Bu]Ar) 3] with electrophilic reagents is presented. The carbamate complex reacts readily with silylation and alkylation reagents to form the carbamate ester complexes of the type ROC(O)NV(N['Bu]Ar) 3. The vanadium carbamate complex reacts with SO2 via a decarboxylation pathway to produce the sulforyl imido complex [Na][O 2SNV(N['Bu]Ar)3], the solid-state structure of which is presented. The reactivity of the vanadium carbamate complex with typical dehydrating reagents, e.g organic acid anhydrides, is shown to proceed cleanly when cobaltocene, acting as an in situ reductant, is present to form the vanadium(IV) isocyanate complex (OCN)V(N['Bu]Ar) 3. The synthesis and structure of the bimetallic complex (TPP)MnOC(O)NV(N['Bu]Ar) 3 (TPP = tetraphenylporphyrin) is presented. Although thermally stable, the complex undergoes a photochemical transformation that forms the vanadium isocyanate complex and putative OMn(TPP), which reacts with triphenylphosphine in the reaction mixture to produce triphenylphosphine oxide. The synthesis the niobium carbamate complex [Na][O 2CNNb(N['Bu]Ar) 3] from the reaction of [Na][NNb(N[Bu]Ar) 3] with CO2 is presented. Its solid-state structure in the form of the ionpair [(12-crown-4) 2Na][O2CNNb(N['Bu]Ar) 3] has been determined. Reaction of the niobium carbamate complex with organic acid anhydrides results in the production of five-coordinate carboxylate, acetate complexes (RC(O)O)(OCN)Nb(N['Bu]Ar) 3. The reduction of these complexes by two electrons results in the regeneration of the niobium nitride complex (60-80% yield) with concomitant release of CO (30-60% yield). This three-step process represents a highly controlled conversion of CO2 to CO via a ligand-based strategy. The reactivity of CO2 with anionic complexes featuring terminal multiply bonded ligands is extended to the oxo anion complex [(Et 2O)2Li][OTi(N['Bu]Ar) 3] resulting in the formation of the carbonate complex ([Li][O 2COTi(N['Bu]Ar) 3]) 6. The binding of CO2 to the oxo complex is reversible when 12-crown-4 is bound to the lithium countercation or if the complex is dissolved in THF. The thermodynamic parameters for the CO2 binding equilibrium have been measured. Exchanging the lithium countercation for sodium or potassium results in a significant weakening of the CO2 binding ability of the oxo complex.
