Topic
IMes
About: IMes is a research topic. Over the lifetime, 319 publications have been published within this topic receiving 11281 citations.
Papers published on a yearly basis
Papers
TL;DR: In this article, a single-crystal X-ray diffraction study has been performed on 6.5-C5Me5-RuCl2(C(H)Ph)(PCy3)2 (1) and the carbene ligand 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes)Cl (3) in 86% isolated yield, where the thermochemical information is used to predict the magnitude of the enthalpic driving force behind substitution reactions
Abstract: The reaction of [Cp*RuCl]4 (1; Cp* = η5-C5Me5) with the carbene ligand 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes) affords a coordinatively unsaturated Cp*Ru(IMes)Cl (3) complex in 86% isolated yield. Solution calorimetric results in this system provide information concerning the electron donor properties of the carbene ligand, which are very similar to those of PCy3. Structural information from single-crystal X-ray studies for complex 3 allows the determination of steric parameters associated with this ligand. The thermochemical information is used to predict the magnitude of the enthalpic driving force behind substitution reactions involving RuCl2(C(H)Ph)(PCy3)2 (1) and the carbene ligand, IMes, affording the RuCl2(C(H)Ph)(PCy3)(IMes) (6) complex in high yield. A similar mixed carbene/phosphine ruthenium complex, RuCl2(C(H)Ph)(PPh3)(IMes), can also be isolated from RuCl2(C(H)Ph)(PPh3)2 and the IMes ligand. A single-crystal X-ray diffraction study has been performed on 6. The thermal stabilit...
1,027 citations
TL;DR: It is established here that [Ir(H)2(IMes)(py)3]Cl undergoes both pyridine (py) loss as well as the reductive elimination of H2 in a reversible process that delivers an 8100-fold increase in 1H NMR signal strength relative to non-hyperpolarized py at 3 T.
Abstract: While the characterization of materials by NMR is hugely important in the physical and biological sciences, it also plays a vital role in medical imaging This success is all the more impressive because of the inherently low sensitivity of the method We establish here that [Ir(H)2(IMes)(py)3]Cl undergoes both pyridine (py) loss as well as the reductive elimination of H2 These reversible processes bring para-H2 and py into contact in a magnetically coupled environment, delivering an 8100-fold increase in 1H NMR signal strength relative to non-hyperpolarized py at 3 T An apparatus that facilitates signal averaging has been built to demonstrate that the efficiency of this process is controlled by the strength of the magnetic field experienced by the complex during the magnetization transfer step Thermodynamic and kinetic data combined with DFT calculations reveal the involvement of [Ir(H)2(η2-H2)(IMes)(py)2]+, an unlikely yet key intermediate in the reaction Deuterium labeling yields an additional 60% i
350 citations
TL;DR: In this article, the exchange reaction of one phosphine ligand in Cl2(PCy3)2RuCHPh (1; Cy = cyclohexyl, C6H11) with the sterically demanding carbene ligands 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes), 1, 3-bis (4-methylphenyl)-imidaxol- 2-ylide (ITol), and 1.5-chlorophenyl-im
233 citations
TL;DR: The indenylidene−imidazolylidene complexes of ruthenium (IMes)(PR3)Cl2Ru(3-phenylindenylID-1-ene) and (IPr)(PR 3)Cl 2Ru(1-en-ene), and R= Ph, Cy) were prepared and found to be efficient catalyst precursors for ring-closing metathesis.
217 citations
TL;DR: The characterization and reactivity studies of these complexes provide the most detailed insights to date into the proposed mechanism for palladium(0) oxidation by molecular oxygen.
Abstract: An η2-peroxopalladium(II) complex, derived from dioxygen addition to Pd(IMes)2 (IMes = bis-1,3-di(2,4,6-trimethylphenyl)imidazoline-2-ylidene), has been isolated and characterized. Subsequent addition of HOAc to (IMes)2Pd(O2) yields the first example of a hydroperoxopalladium species derived from molecular oxygen. The characterization and reactivity studies of these complexes provide the most detailed insights to date into the proposed mechanism for palladium(0) oxidation by molecular oxygen.
194 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 8 |
| 2024 | 11 |
| 2023 | 22 |
| 2022 | 34 |
| 2021 | 18 |
| 2020 | 15 |