Iridium complexes cyclopentadienyl

Methoxycarbonyl)chroman-3-one, arylation, 9, 394—395 Methoxycarbonyl groups, Ru and Os complexes, 6, 837 2-Methoxyestradiol, via iridium cyclopentadienyl complexes,... 

Mixed-sandwich complexes with cyclodextrins, 12, 787 iridium cyclopentadienyl complexes, 7, 368 with nickel, synthesis and reactivity, 8, 160 with vanadium, 5, 47... 

Bis(cyclooctene)—iridium(I) complexes, preparation, 7, 316 Bis(cyclopentadienyl) alkenes, with tantalum, 5, 157 Bis(cyclopentadienyl) alkyne niobium complexes, characteristics, 5, 81... 

Deprotonation with aluminum alkys, 9, 272 mononuclear carbonyl iridium complexes, 7, 302 for palladium cyclopentadienyl complexes, 8, 390 in Ru and Os half-sandwich preparations, 6, 569 in silver carbene synthesis, 2, 206 Desulfurization... 

Iridium nanoparticles, preparation, 12, 82 Iridium(III) O-ligated complexes, preparation, 7, 315 Iridium polyhydrides, preparation and characteristics, 7, 405 Iridium pyrrolyl derivatives, reactivity, 7, 282 Iridium tetrahydrides, characteristics, 7, 407-408 Iridium trihydrides, preparation, 7, 405 Iridium vinylidenes, synthesis and characteristics, 7, 352 Iridium xyliphos complexes, properties, 7, 442 Iridoids, via Pauson-Khand reaction, 11, 360 Iron(arene) (cyclopentadienyl) cations, preparation and reactivity, 6, 166... 

IRIDIUM ARENE (See Arene Complexes) AND CYCLOPENTADIENYL (See Cyclopentadienyl) COMPLEXES... 

Jones WD (1989) Alkane activation by cyclopentadienyl complexes of rhodium, iridium and related species. In Hill CL (ed) Activation and functionalization of alkanes. 

Phosphanylalkyl)cyclopentadienyl complexes of cobalt, rhodium, and iridium are known. In some cases, not only the synthesis and structure of such complexes have been described, but a number of reactions have also been investigated. 

In the case of rhodium and iridium, cyclopentadienyl compounds for high oxidation states ( + 5) of the metals are known. These complexes, like rhodium(III) and iridium(III) compounds, with the pentamethylcyclopentadienyl ligand... 

Several catalytic systems including iridium hydride, oxo-phosphoranyl, N-heterocyclic carbene, cyclooctadiene, and dimeric cyclopentadienyl complexes have been successfully employed in alkyne hydrosilylation to afford selectively j0-(Z)-alkenylsilanes in high 3delds (4). 

Oxidative Addition to Low Valent Metal Complexes. The H/D exchange and oxidative addition of aromatic compounds by low valent coordina-tively unsaturated complexes are well known. On the other hand, clear examples of the oxidative addition of saturated hydrocarbons were first reported in 1982, in which 16-e iridium(I) and rhodium(I) complexes, which are generated through the photoassisted dissociation of CO or H2 were utilized. Similar methodologies are applicable to methane activation. Thus, 16-e cyclopentadienyl iridium(I) complexes, which are generated thermally or under photolysis, easily react with methane and result in methyl hydrido complexes at relatively low temperatures (eq. (D) (2,3). 

Rhodium and Iridium.- Cyclopentadienyl stabilised dirhodium complexes include the... 

W. D. Jones, in Activation and Functionalization of Alkanes, C. L. Hill, Ed., Wiley, New York, 1988, pp. 111-149. Alkane Activation Processes by Cyclopentadienyl Complexes of Rhodium, Iridium and Related Species. 

A heterodinuclear iridium-ruthenium complex [Ir (Cp )(H20)-(bpm)Ru (bpy)2](S04)2 (Ir -OH2, Cp = j -pentamethyl-cyclopentadienyl, bpm = 2,2 -bipyrimidine, bpy = 2,2 -bipyridine) can also act as an effective catalyst for removal of dissolved O2 by the four-electron reduction of O2 with formic acid in water at an ambient temperature. The Ir complex reacts efficiently with O2, as shown by the spectral titration in Figure 4.24, where the absorption spectra due to Ir are changed to those of Ir -OH2. The titration... 

Reaction of the cyclopentadienyl rhodium and iridium tris(acetone) complexes with indole leads to the species 118 (M = Rh, Ir) [77JCS(D)1654 79JCS(D)1531]. None of these compounds deprotonates easily in acetone, but the iridium complex loses a proton in reaction with bases (Na2C03 in water, r-BuOK in acetone) to form the ri -indolyl complex 119. This reaction is easily reversed in the presence of small amounts of trifluoroacetic acid. 

The fourth chapter gives a comprehensive review about catalyzed hydroamina-tions of carbon carbon multiple bond systems from the beginning of this century to the state-of-the-art today. As was mentioned above, the direct - and whenever possible stereoselective - addition of amines to unsaturated hydrocarbons is one of the shortest routes to produce (chiral) amines. Provided that a catalyst of sufficient activity and stabihty can be found, this heterofunctionalization reaction could compete with classical substitution chemistry and is of high industrial interest. As the authors J. J. Bmnet and D. Neibecker show in their contribution, almost any transition metal salt has been subjected to this reaction and numerous reaction conditions were tested. However, although considerable progress has been made and enantios-electivites of 95% could be reached, all catalytic systems known to date suffer from low activity (TOP < 500 h ) or/and low stability. The most effective systems are represented by some iridium phosphine or cyclopentadienyl samarium complexes. 

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