Download or read book Oxygen Transfer Reactions Catalyzed by Rhenium VII and Rhenium V Complexes written by Ruili Huang and published by . This book was released on 2000 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new binuclear oxothiolatorhenium(V) compound, Re2O2(mtp)3 (D1, mtp = 2- mercaptomethylthiophenol), was synthesized by reacting dirhenium(VII) heptoxide (Re2O7) with H2mtp, and characterized spectroscopically and crystallographically. One Re-S bridge in D1 was opened, and sometimes D1 was monomerized, through ligand coordination. D1 was found to be an efficient catalyst for the oxidation of phosphines, triphenylarsine, triphenylantimony, sulfides and dienes by pyridine N-oxides, and unprecedently, by molecular oxygen. D1 also catalyzes the oxidation of phosphines by dimethylsulfoxide. The kinetics and mechanism for the oxidation of triarylphosphines by pyridine N-oxides and 02, as well as the relative reactivities of all substrates, were studied. The reaction was proposed to go through oxorhenium(VII) intermediates. Methyltrioxorhenium (MTO) catalyzes the two-step oxidation of thioketones by hydrogen peroxide to sulfines (thioketone S-oxides) and to ketones releasing sulfur monoxide, which was trapped by a 1,3-diene. The kinetics and mechanism of both steps were studied. The substituted thiobenzophenones were found to attack the peroxo rhenium oxygen nucleophilically.
Download or read book Mechanistic Study of Oxygen Atom Transfer Catalyzed by Rhenium Compounds written by Xiaopeng Shan and published by . This book was released on 2003 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of oxygen atom transfer (OAT) catalyzed by transition metal complexes continues to provide chemical insight for advanced studies in bioinorganic chemistry as well as industrial applications. Unlike molybdenum(IV/VI) pairs, which received intensive interest from inorganic and bioinorganic chemists for decades, rhenium(V/VII), forming the redox loop involving two-electron or one-oxygen atom processes has only received limited attention. A family of oxorhenium(V) complexes was synthesized from methyltrioxorhenium(VII), abbreviated as MTO, that can be reduced by phosphanes, thiols or sulfides and coordinated by suitable ligands including thiolates, phosphanes, pyridines, phenolates, carboxylates and etc. An unexpected methyl transfer from rhenium to thiolate sulfur was discovered when MTO react with 1,2-ethanedithiol without the presence of a reducing reagent. Ligand displacement was found to be an essential step in OAT reactions catalyzed by rhenium(V) complexes. This allows the oxidant to access rhenium(V) and be activated by the metal subsequently. Kinetic studies of ligand exchange of MeReO(dithiolate)Py with Py or phosphanes and ReO([kappa]2-edt)([kappa]2-edtMe) with phosphanes all revealed in unique correlation behavior when series of substituted ligands were employed. Detailed investigation led us to conclude that a three-step mechanism was involved and caused this unique phenomenon. Further study of the OAT catalytic cycle led us to investigate the geometric effect on the oxidation of rhenium(V) complexes with pyridine N-oxides. Five and six coordinated rhenium(V) complexes with tridentate ligands display an entirely different rate law. The reactions of six-coordinate compounds shows first-order dependence on the concentration of water instead of pyridine N-oxide in the rate law of the reactions of five coordinated rhenium(V) compounds. Steric demand may play the key role in this difference. A catalytic OAT cycle with pyridine N-oxides and sulfide catalyzed by MeReO(PA)2, where PAH is 2-piclinic acid, was investigated. Mechanistic and isotope labeling studies were applied to trap the intermediate, from which a structure was postulated.
Download or read book Kinetics Mechanism and Computational Studies of Sulfur and Oxygen Atom Transfer Reactions Catalyzed by Rhenium V Dithiolate Complexes written by Abdellatif Ibdah and published by . This book was released on 2005 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: A notable feature of rhenium(V) dithiolate complexes is their five coordinated square pyramidal geometry, which allows a vacant coordination site trans to the oxo or thio group for the substrate to access to rhenium(V) center. The oxothenium(V) dimer (MeRe[superscript v]O(edt))2 catalyzes sulfur atom transfer (SAT) from Thiirane to Ph3E (E=P, As). The rate law of triphenylarsine reaction, v = k[Thiirane][Re][Ph3As]0. The value of k/L mol−1 s−1 at 25.0 0C in CDCl3 are 5.58 ± 0.08 for cyclohexene sulfide. No uncatalyzed reaction has been observed even though the reaction is thermodynamically favored; values of [Delta]H0 are -21 and -7 kcal mol−1 for PPh3 and AsPh3, respectively, from theoretical calculations. Catalytic amount of oxothenium(V) dimer (MeRe[subscript v] O(edt))2 is enough to proceed the reaction to completion. Mechanism of catalytic cycle has been proposed to interpret the kinetic results. Kinetics and theoretical study have been done on Me(mtp)ReS(PPh3) catalysis (mtpH2 = 2-(mercaptomethyl)thiophenol). Interestingly, it is adopt two mechanistic pathways. First, chain mechanism pathways. Second, nucleophilc mechanism pathway. The balance between these two pathways is controlled by phosphine and pyridine N-oxide concentrations. The electronic structure of Re=E (E=O, S) in Re(V) and Re(VII) have examined theoretically. The Re=E bonds consist of one [Sigma] and two partial [Pi] bond, which agree with bond order analysis 2. Bond strength of Re[superscript v]=O and Re[superscript v]=S are from DFT calculation estimated to be approximately 163.7± 1.8 kcal mol−1 and 123 ± 3 kcal mol−1, respectively. Also, bond strength of Re[superscript VII]=O and Re[superscript VII]=S are also estimated to be 118.7± 1.2 kcal mol−1 and 80.5 ± 3.5 kcal mol−1, respectively. Stronger Re[superscript v]=E bond than Re[superscript VII]=E bond agree with Re[superscript VII]O2 and ReVIIOS are the key intermediate in OAT and SAT reaction.
Download or read book Mechanistic Studies and Synthetic Applications of Oxygen Atom Transfer Reactions Catalyzed by Rhenium V Dithiolato Complexes and Methyltrioxorhenium MTO written by Ying Wang and published by . This book was released on 2001 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the case of oxygen atom transfer reaction between tert-butyl hydroperoxide and sulfide catalyzed by Re(V) dithiolato compounds, an induction period is observed due to the slow ligand exchange step. Reaction schemes are proposed to interpret the kinetic data. In both cases, the active intermediates are Re(VII) dioxo species, which were detected at the low temperature. Organic disulfides with both alkyl and aryl substituents are oxidized by hydrogen peroxide when CH3ReO33 (MTO) is used as a catalyst. Thiosulfinate is formed in the first step about an hour with nearly quantitative yield. Kinetics studies of the first oxidation reaction established that two peroxorhenium compounds are the active forms of the catalyst. Rate constants were obtained and a mechanism was proposed in which the electron-rich sulfur attacks the peroxo oxygen of intermediates.
Download or read book Rhenium catalyzed Oxygen atom Transfer Reactions written by Eric C. Brown and published by . This book was released on 2002 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ reduction of hydrido-tris-(3,5-dimethylpyrazolyl)borato(trioxo) rhenium(V) with triphenylphosphine or triethylphosphite leads to a reactive rhenium(V) species that catalytically deoxygenates epoxides at 75-105°C. The reaction is stereospecific, except for trans- and cis-butene oxide which formed minor amounts of the opposite isomer. A variety of different functional groups were tolerated and even epoxides that reacted slowly could be pushed to greater than 95% conversion given extended time and/or higher temperature. The absence of clustering processes shows how the choice of ligand can have a major influence on the design of the catalytic cycle. The rhenium(V) species formed from reduction of Tp'ReO3 was identified as Tp'Re(O)(OH)2. Tp'Re(O)(OH)2 reacted with ethanol and HCl to form ethoxide and hydroxo chloride complexes, respectively. In addition, Tp'Re(O)(OH)2 was an excellent catalytic and stoichiometric reagent for the deoxygenation of epoxides and sulfoxides. Loss of water from Tp'Re(O)(OH)2 to form the catalytically active species Tp'Re02 was shown to be a necessary preequilibrium process. The kinetic behavior of the catalytic system is complex. First-order behavior in [Re][subscript T], zero-order dependence in [PPh3] and saturation behavior for epoxide were observed. The reversible formation of a coordinated epoxide complex was proposed to explain the saturation behavior. The epoxide complex was shown experimentally and computationally to engage in two separate reactions: ring expansion to form a syn-diolate complex, and direct fragmentation to alkene and trioxide. A steady-state concentration of diolate is eventually reached explaining a "burst" of alkene production prior to generation of a pseudo-zero-order catalytic system. The diolate formed is the syn-isomer, which is the kinetically formed product. Direct epoxide fragmentation is the primary source of alkene. This process was determined to be four times faster than ring expansion for cis-stilbene oxide. The synthesis and characterization of a tethered-epoxide Cp* rhenium trioxide complex has been achieved. Reduction of this complex leads to an unsaturated rhenium(V) species that is immediately complexed by the tethered epoxide. Experimental data and molecular mechanics modeling support intramolecular coordination of the epoxide to the rhenium center. These results confirm that the coordinate epoxide is a viable intermediate in rhenium-catalyzed epoxide deoxygenations.
Download or read book Carbon carbon Bond Forming Reactions Catalyzed by Rhenium V oxo and Cationic Phosphinegold I Complexes written by Olivia Y. Hung and published by . This book was released on 2007 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactions and Mechanisms of Rhenium Catalyzed Oxygen Atom Transfer written by Joachin Jude Arias and published by . This book was released on 2001 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Reactivity of Rhenium I Tris acetylene and Oxo Bis acetylene Complexes Oxygen Atom Transfer Reactions of Rhenium Triazacyclononane Compounds written by Rebecca Renae Conry and published by . This book was released on 1991 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactivity and Mechanisms of Oxazoline and Thiazoline based Rhenium V Catalysts for Oxygen atom and Imido Transfer Reactions written by Lee D. McPherson and published by . This book was released on 2004 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Applications of Rhenium Compounds and Hydrogen Atom Transfer Reactions of Substituted Phthalimide N oxyl Radicals written by Yang Cai and published by . This book was released on 2004 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, methyltrioxorhenium (MTO) was found to be an active catalyst for two reactions: one is the reduction of hydronium ions by Eu[Subscript aq]2 to evolve H2; the other is reduction of perchlorate ions to chloride ions by Eu[Subscript aq]2+ or Cr[Subscript aq]2+ in acidic solution. Kinetic studies were carried out and reaction mechanisms were proposed to agree with all the experimental data. In the hydrogen evolution reaction, a rhenium(V) hydride complex was postulated in the scheme to generate H2 by a proton-hydride reaction. Under similar conditions, Cr2+ ions do not evolve H2, despite E0[Subscript Cr][Difference]E0[Subscript Eu]. In addition, no H2 formation was observed in the presence of perchlorate ions because the reaction between methyldioxorhenium (MDO) and perchlorate ions has a much faster rate than that of hydrogen evolution. A six-coordinate rhenium(V) compound MeReO(edt)(bpym) was prepared, characterized, and investigated for oxygen atom transfer reactions between picoline N-oxide and triarylphosphines. We found it is a good catalyst for the reaction, even though it is less active than those five-coordinate rhenium(V) dithiolato compounds. The kinetics showed that the reaction has a first-order dependence on both rhenium and picoline N-oxide. Triarylphosphines were found to inhibit the reaction, and those phosphines with more electron-donating groups in para positions had slower reaction rates. This study proves a hypothesis: there should be a steric requirement for the potential catalyst in the oxygen transfer reactions, which is the necessary existence of an open coordination site on rhenium center. In the last chapter, we studied three different types of reactions of phthalimide N-oxyl radicals (PINO·) and N-hydroxylphthalimide (NHPI) derivatives. First, the self-decomposition of PINO· follows second-order kinetics. However, when excess of 4-Me-NHPI are used in the system, it was found that H-atom abstraction competes with the self-decomposition of 4-Me-PINO·. Second, the hydrogen atom self-exchange reactions between PINO· and substituted NHPI were found to follow H-atom transfer rather than the stepwise electron-proton transfer pathway. Last, the investigations of hydrogen abstraction from para-xylene and toluene by PINO· show large kinetic isotope effects, with the reaction becoming slower when the ring substituent on PINO· is more electron donating.
Download or read book Mechanistic Study of Oxygen Atom Transfer Catalyzed by Rhenium Compounds written by and published by . This book was released on 2003 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two ionic and one neutral methyl(oxo)rhenium(V) compounds were synthesized and structurally characterized. They were compared in reactivity towards the ligands triphenylphosphane, pyridines, pyridine N-oxides. Assistance from Broensted bases was found on ligand displacement of ionic rhenium compounds as well as nucleophile assistance on oxidation of all compounds. From the kinetic data, crystal structures, and an analysis of the intermediates, a structural formula of PicH+3- and mechanisms of ligand displacement and oxidation were proposed.
Download or read book Advances in Inorganic Chemistry written by Rudi van Eldik and published by Gulf Professional Publishing. This book was released on 2003-07-08 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advances in Inorganic Chemistry series presents timely and informative summaries of the current progress in a variety of subject areas within inorganic chemistry ranging from bio-inorganic to solid state studies. This acclaimed serial features reviews written by experts in the area and is an indispensable reference to advanced researchers. Each volume of Advances in Inorganic Chemistry contains an index, and each chapter is fully referenced. This, the 54th volume in the series continues this tradition providing comprehensive reviews by leading experts in the field with the focus on inorganic and bioinorganic reaction mechanisms. The latest volume in this highly successful series is dedicated to inorganic and bioinorganic reaction mechanisms Comprehensive reviews written by leading experts in the field
Download or read book Physical Inorganic Chemistry written by Andreja Bakac and published by John Wiley & Sons. This book was released on 2010-04-22 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: This go-to text provides information and insight into physical inorganic chemistry essential to our understanding of chemical reactions on the molecular level. One of the only books in the field of inorganic physical chemistry with an emphasis on mechanisms, it features contributors at the forefront of research in their particular fields. This essential text discusses the latest developments in a number of topics currently among the most debated and researched in the world of chemistry, related to the future of solar energy, hydrogen energy, biorenewables, catalysis, environment, atmosphere, and human health.
Download or read book Organic Reaction Mechanisms 2001 written by A. C. Knipe and published by John Wiley & Sons. This book was released on 2005-07-15 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: This annual series on organic reaction mechanisms research provides concise, comprehensive coverage of the year's literature as well as discussions of important results, each volume is extensively referenced to previous volumes and primary journals. This the 37th book in the series will survey research on organic reaction mechanisms described in the literature between December 1999 to November 2000. As in previous volumes new mechanisms for the synthesis of all types of organic compounds will be included as well as such mechanisms as addition and elimination reactions, nucleophilic and electrophilic aromatic substitutions and molecular arrangements.
Download or read book Reversing the Role of the Metal oxygen Pi bond written by Kristine Anne Nolin and published by . This book was released on 2007 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Coordination Chemistry II written by J. A. McCleverty and published by Newnes. This book was released on 2003-12-03 with total page 11845 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.
Download or read book Inorganic Syntheses Volume 36 written by and published by John Wiley & Sons. This book was released on 2014-03-18 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of Inorganic Syntheses spans the preparations of wide range of important inorganic, organometallic and solid-state compounds. The volume is divided into 6 chapters. The first chapter contains the syntheses of some key early transition metal halide clusters and the very useful mononuclear molybdenum(III) synthon, MoCl3(THF)3. Chapter 2 covers the synthesis of a number of cyclopentadienyl compounds, including a novel route to sodium and potassium cyclopentadienide, MC5H5. Chapter 3 details synthetic procedures for a range of metal-metal bonded compounds, including several with metal-metal multiple bonds. Chapter 4 contains procedures for a range of early and late transition metal compounds, each a useful synthon for further synthetic elaboration. Chapter 5 deals with the synthesis of a number of main group compounds and ligands, while Chapter 6 covers teaching laboratory experiments.
