Relative importance of dissociative loss of carbon monoxide and formation of benzyl radicals from photoexcitation of (.eta.5-C5R5)Fe(CO)2(.eta.1-CH2C6H5) and evidence for reaction of carbon monoxide with 17-electron radicals
Extending the range of pentasubstituted cyclopentadienyl compounds: The synthesis of a series of tetramethyl(alkyl or aryl)cyclopentadienes (Cp ∗ R ), their iridium complexes and their catalytic activity for asymmetric transfer hydrogenation
摘要:
Tetramethyl(alky or aryl)cyclopentadienes were synthesized and the organometallic half-sandwich iridium complexes of the form [(eta(5)-Cp*(R))Ir(aa)Cl], Cp*(R) = tetramethyl(phenyl)cyclopentadienyl (Cp*(Ph)), tetramethyl(benzyl)cyclopentadienyl (Cp*(Bn)), tetramethyl(2-propyl)cyclopentadienyl (Cp*(iPr)), or tetramethyl(cyclohexyl)cyclopentadienyl (Cp*(Cy)) were prepared and characterized. The complexes adopt a piano stool configuration, forming diastereomers, with ratios similar to reported [(eta(5)-Cp*(R))Ir(aa)Cl] complexes. The complexes display an intermolecular hydrogen bonding network in the solid state. These complexes were tested for the asymmetric transfer hydrogenation of several ketones, showing that the R of the Cp*(R) drastically impacts both selectivity and rate of reaction. Additionally, severe solvent effects are displayed when the reaction media is changed from aqueous to organic solvent. (C) 2014 Elsevier Ltd. All rights reserved.
Modulating the water oxidation catalytic activity of iridium complexes by functionalizing the Cp*-ancillary ligand: hints on the nature of the active species
作者:Giordano Gatto、Alice De Palo、Ana C. Carrasco、Ana M. Pizarro、Stefano Zacchini、Guido Pampaloni、Fabio Marchetti、Alceo Macchioni
DOI:10.1039/d0cy02306j
日期:——
A comparative study on the behavior of a series of iridium dimeric WOCs with modified Cp* ligands reveals the key role played by the variable substituent.
一项关于一系列具有改性Cp*配体的铱二聚WOCs行为的比较研究揭示了可变取代基发挥的关键作用。
Enhanced Intracellular Accumulation and Cytotoxicity of Ferrocene‐Ruthenium Arene Conjugates
dibenzylferrocene (2) gave air‐ and water‐stable dinuclear (4) or trinuclear (6) ferrocene‐ruthenium conjugates. The complexes were characterized by NMR, ESI‐MS, cyclic voltammetry (CV), elemental analysis, and the molecular structure of 4 was established by single crystal X‐ray diffraction. Contrary to the starting ferrocenes 1 and 2, conjugates 4 and 6 showed significant in vitro anticancer activity (up to IC50
The reaction of YCl3·3.5THF with 1 equiv. of Li(C5Me4SiMe3) afforded in high yield the ionic complex [Li(thf)4]+[(η5‐C5Me4SiMe3)YCl2]4(µ4‐Cl)}– (1). The molecule of 1 consists of the tetranuclear anion [(η5‐C5Me4SiMe3)YCl2]4(µ4‐Cl)}– compensated with [Li(thf)4]+ in the solid state. Reactions of compound1 with selectedlithium and potassium cyclopentadienides resulted in the formation of yttrocene
Rapid Access to Derivatized, Dimeric, Ring-Substituted Dichloro(cyclopentadienyl)rhodium(III) and Iridium(III) Complexes
作者:Loren C. Brown、Emily Ressegue、Joseph S. Merola
DOI:10.1021/acs.organomet.6b00580
日期:2016.12.27
The present work describes the design and synthesis of a series of rhodium and iridium dimers [(eta(5)-ring)MCl](2)(mu(2)-Cl)(2) (where (eta(5)-ring)MCl = (eta(5)-Me4C5R)Rh(III)Cl or (eta(5)-Me4C5R)Ir(III)Cl) using a new and efficient 1 h procedure. Rhodium and iridium dimeric complexes were synthesized via a microwave reaction. The modified HMe4C5R (R = isopropyl, n-butyl, isobutyl, sec-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, phenyl, benzyl, phenethyl, cyclohexyl, and cyclopentyl) type ligands were synthesized by reaction of 2,3,4,S-tetramethylcyclopent-2-en-1-one with the respective Grignard reagent (RMgX), followed by elimination of water under acidic conditions to produce the tetramethyl(alkyl or aryl)cyclopentadienes in moderate to excellent yields (40-98%). Reaction of the HMe4C5R ligands with [M(COD)](mu(2)-Cl)(2) (M = Rh, Ir; COD = 1,S-cyclooctadiene) gave the dimeric complexes [(eta(5)-Me4C5R)MCl](2)(mu(2)-Cl)(2) in yields ranging from 47% to 96%. The derivatized dimers were tested for antimicrobial activity, showing activity against Mycobacterium smegmatis and improved activity with derivatized R groups against Staphylococcus aureus and MRSA 43300. The characterization of these complexes was completed by NMR spectroscopy, single-crystal X-ray diffraction, high-resolution mass spectrometry, and elemental analysis.
Davis Jr., James H.; Benvenuto, Mark A.; Grimes, Russell N., Inorganic Chemistry, 1991, vol. 30, # 8, p. 1765 - 1770
作者:Davis Jr., James H.、Benvenuto, Mark A.、Grimes, Russell N.