Download or read book Synthesis Reactions and Kinetics of Indenyl nitrosyl Group VI Metal Carbonyl Complexes with Phosphorus Ligands written by Rmdan A. Altwer and published by . This book was released on 2014 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ligand exchange reactions between various metal carbonyl derivatives and incoming ligands such as phosphine and phosphites have been extensively studied. It is known that prototypical organometallic compounds such as ([eta]5-C5H5)Mn(CO)3 are virtually unreactive to thermal exchange of carbonyl ligands while its indenyl derivative ([eta]5-C9H7)Mn(CO)3 undergoes carbonyl exchange at moderate temperatures. Several examples of rate acceleration by indenyl ligands relative to cyclopentadienyl ligands have now been reported and the observed "indenyl effect" attributed to the ability of the indenyl ligand being able to shift its binding from [eta]5 to [eta]3 during associative reactions. This [eta]5 to [eta]3 haptotropic rearrangement lowers the energy of activation. A similar effect has been observed for metal nitrosyl compounds. In these cases, the nitrosyl ligand is normally observed to be bound linearly to the metal and formally treated as a three-electron donor. Associative reactions of metal carbonyl, nitrosyl compounds with ligands have been shown to be accelerated relative to all carbonyl compounds. This acceleration is attributed to a "nitrosyl effect" in which the nitrosyl ligand can go from a linear, three-electron donor to a bent, one-electron donor in the associative reaction intermediate. The family of Group VI compounds [eta]5-C5H5)M(CO)2(NO) and their indenyl derivatives offer an interesting platform to examine both indenyl and nitrosyl effects in the same molecules The ([eta]5-C5H5)M(CO)2(NO) derivatives for Cr, Mo and W are known, but only ([eta]5-C9H7)Cr(CO)2(NO) has been reported for the indenyl derivatives. The chromium compound was prepared using CrCl(CO)2(NO)Py2 as a precursor. This research set out to prepare the series of Group VI compounds, ([eta]5-C9H7)M(CO)2(NO), by conventional routes using the reaction of ([eta]5-C9H7)M(CO)3 anions with known NO donors such as Diazald. Subsequent carbonyl exchange kinetics studies were planned with the goal of investigating the indenyl and nitrosyl effects down the Group VI family of compounds. ([eta]5-C9H7)Cr(CO)2(NO) was successfully prepared by the proposed route, albeit in low yield, but neither the Mo or W compounds could be prepared. A simple alkylation reaction to prepare ([eta]5-C9H7)M(CO)3(CH2C6H5) was carried out after many failures to ensure ourselves that the intermediate ([eta]5-C9H7)M(CO)3 anions were being successfully prepared. Our kinetics studies were therefore limited to ([eta]5-C9H7)Cr(CO)2(NO). As noted above, the corresponding ([eta]5-C5H5)Cr(CO)2(NO) derivative has been reported to be thermally unreactive with PPh3 although derivatives of the form ([eta]5-C5H5)Cr(CO)(NO)L, where L = phosphine or phosphite, can be prepared photochemically. We have carried out a series of pseudo-first order kinetics studies of ([eta]5-C9H7)Cr(CO)2(NO) with PMe3, PBu3, PMe2Ph and P(OMe)3. This series represents a range of ligand nucleophilicity and cone angle (steric bulk). Energies of activation were determined by measurements of the rates of reaction across a range of temperatures, while the entropy and enthalpies of activation were extracted from Eyring plots. The strongly negative entropies of activation are consistent with an associative reaction. The data do not allow us to parse out the relative contributions of indenyl and nitrosyl effects, but the observation that [delta]S[not equal] values are on the order of -49 eu, while those of ([eta]5-C9H7)Mn(CO)3 are around -26 eu argues for an associative mechanism.
Download or read book The Synthesis and Properties of Polynuclear Nitrosyl Carbonyl Complexes written by Jack Richard Norton and published by . This book was released on 1971 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ligand substitution and insertion reactions of group 6 metal carbonyl complexes written by Karen Jennifer Schneider and published by . This book was released on 1989 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural and Kinetic Investigations of Group VI and Group VIII Metal Carbonyl Derivatives Containing Trisodium Tris m sulfonatophenyl Phosphine Ligands written by Christopher John Bischoff and published by . This book was released on 1991 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Group VI Metal Carbonyl Catalyzed Reactions of Acid Halides and Ethers and Synthesis and Reactions of a Cholestadienyl iron Tricarbonyl Cation written by Che-cheng Huang and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetics of Reactions of Substituted Group VI B Metal Carbonyls with Phosphites written by Albert J. Rettenmaier and published by . This book was released on 1972 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetic Studies of Some Group VI Metal Carbonyl Complexes written by James Richard Graham and published by . This book was released on 1967 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organometallic Syntheses written by R. Bruce King and published by Elsevier. This book was released on 2013-10-22 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organometallic Syntheses, Volume 3 focuses on the synthesis of compounds containing carbon-metal bonds, including ligands, compounds, chlorides, and derivatives. The selection first elaborates on bis(cyclopentadienyl) organolanthanide and organoyttrium chloride, methyl, and hydride complexes and base stabilized alkali metal halide adducts of bis (pentamethylcyclopentadienyl) lanthanide chlorides. The text then examines cyclopentadienyl metal carbonyl and nitrosyl derivatives, ferrocenylamine, cobalticinium and rhodicinium salts, and alkyl transition metal derivatives. The publication takes a look at transition metal complexes containing organophosphorus ligands, transition metal derivatives containing chalcogen ligands, and coinage metal derivatives. The text also reviews transition metal organometallic compounds, including compounds of group IA, IIA, IIB, and IVA. The selection is a vital reference for researchers interested in the synthesis of compounds containing carbon-metal bonds.
Download or read book The Organometallic Chemistry of the Transition Metals written by Robert H. Crabtree and published by John Wiley & Sons. This book was released on 2005-06-14 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully updated and expanded to reflect recent advances, this Fourth Edition of the classic text provides students and professional chemists with an excellent introduction to the principles and general properties of organometallic compounds, as well as including practical information on reaction mechanisms and detailed descriptions of contemporary applications.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 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 1969 with total page 970 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 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1985 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Vocabulary and Concepts of Organic Chemistry written by Milton Orchin and published by John Wiley & Sons. This book was released on 2005-07-08 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a basic reference providing concise, accurate definitions of the key terms and concepts of organic chemistry. Not simply a listing of organic compounds, structures, and nomenclatures, the book is organized into topical chapters in which related terms and concepts appear in close proximity to one another, giving context to the information and helping to make fine distinctions more understandable. Areas covered include: bonding, symmetry, stereochemistry, types of organic compounds, reactions, mechansims, spectroscopy, and photochemistry.
Download or read book Organometallic Chemistry written by Gary O. Spessard and published by Oxford University Press, USA. This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed with the needs of both undergraduate and graduate students in mind, Organometallic Chemistry, Third Edition, covers the fundamentals of organometallic chemistry by presenting seminal experiments, analyzing real data, and offering the most comprehensive problem sets available. The text opens with careful explanations of the structure and bonding of organometallic compounds, providing a uniquely accessible introduction to the subject for undergraduate students. Later chapters build on this foundation with in-depth coverage of more advanced topics such as organometallic reaction mechanisms, catalysis, carbene complexes, metathesis, applications of organometallic chemistry to organic synthesis, and bioorganometallic chemistry.
Download or read book Alkoxo and Aryloxo Derivatives of Metals written by Don Bradley and published by Elsevier. This book was released on 2001-02-22 with total page 717 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkoxo and Aryloxo Derivatives of Metals gives a comprehensive account of the chemistry of metal alkoxides and metal aryloxides, including their industrial applications such as microelectronics, ceramics, nonlinear optical materials, high-temperature superconductors, specialized glasses, and other advanced novel materials. It is an invaluable reference source book. The book is an updated edition of Metal Alkoxides, published by Academic Press in 1978, with additional coverage of metal aryloxides. It reflects the enormous growth in interest in this field in recent years. Alkoxo and aryloxo derivatives are organic compounds with metals for useful industrial purposes. Alkoxo and Aryloxo Derivatives of Metals will appeal to a wide-ranging audience, including university researchers and chemistry graduate students in industrial laboratories concerned with microelectronics, ceramics, glasses and other advanced novel materials; any laboratories doing research on nonlinear optical materials, high-temperature superconductors, ceramic materials, and specialized glasses. It can also serve as a supplementary text for final year courses in advanced inorganic chemistry, e.g., metallo-organic chemistry.
