Synonyms:Iridiumblack;Iridium, elemental;
99.9% *data from raw suppliers
Iridium black, 99.8% (metals basis) *data from reagent suppliers
Xi,
F
The research focuses on the synthesis and characterization of new dithioformato complexes of platinum metals, specifically ruthenium, osmium, and iridium. The purpose of the study was to explore the "insertion" of carbon disulfide into platinum metal-hydrogen bonds, leading to the formation of a range of dithioformato complexes. The researchers used various chemical species, including [MX(S2CH)(CO)(PPh3)2] (with M being Ru or Os and X being Cl, Br, or OCOCF3), [M(S2CH)2(PPh3)2], [IrCl2(S2CH)(PPh3)2], and others, to investigate the stereochemistry and structure of these complexes. The conclusions drawn from the study were that the dithioformate anion could be detected and characterized by its IR and proton NMR spectra, and that the stereochemistry of the complexes could be assigned based on NMR patterns and couplings. The research also established that the dithioformate ligands exhibit specific NMR couplings that are valuable for determining the stereochemistry of the complexes. The study provided a comprehensive series of dithioformato complexes, contributing to the understanding of their synthesis, structure, and potential applications.
The research focuses on the synthesis and characterization of high-nuclearity mixed-metal carbonyl clusters containing iridium, ruthenium, and gold. The purpose of the study is to explore the formation of these complex clusters and understand their structural properties. The researchers synthesized three main clusters: [Ir7Ru3(CO)23], [Ir7Ru3(CO)23(AuPPh3)], and [Ir6Ru3(CO)21(AuPPh3)]. The process involved using [PPh4]2[Ir6(CO)15] as a starting material and reacting it with [Ru3(CO)12] in the presence of p-toluenesulfonic acid to form the initial cluster. Further reactions with [AuCl(PPh3)] and AgOSO2CF3 were used to modify the cluster by adding gold ligands. The study concluded that these clusters exhibit unique structural features, such as a tetrahedrally capped octahedral iridium core, and the ability to incorporate gold ligands while maintaining the cluster framework.
This research investigates the enantioselective hydrogenation of 2-aryl-substituted terminal alkenes using iridium complexes derived from chiral P,N ligands as catalysts. The purpose is to find efficient and highly selective catalysts for this type of hydrogenation, which is important for synthesizing chiral compounds. The study tested six iridium complexes, with the most selective being IrThrePHOX (Ir-2), which achieved enantiomeric excesses (ee) of 88–94% under optimal conditions of room temperature and ambient hydrogen pressure. The research concluded that these iridium complexes, especially Ir-2, provide an efficient and practical route for enantioselective hydrogenation of terminal alkenes, offering high enantioselectivities and full conversions under mild conditions.
The research investigates the relationship between the stereochemical elements of a phosphoramidite ligand and the stereoselectivity of iridium-catalyzed amination of allylic carbonates. The study aims to understand how different parts of the cyclometalated structure influence reactivity and selectivity, leading to the development of a simpler and more practical catalyst. The researchers found that replacing the distal chiral phenethyl substituent with a large achiral cycloalkyl group resulted in a catalyst with similar rates and enantioselectivities to the original. They also discovered that the difference in reactivity between diastereomeric catalysts is partly due to different rates of cyclometalation. Ultimately, they developed a highly active and selective catalyst using a ligand with a single phenethyl group as the sole resolved stereochemical element, which is simpler and more practical than the original more elaborate ligand.
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