Arene hydrogenation in a room-temperature ionic liquid using a ruthenium cluster catalyst

Dyson, Paul J.; Ellis, David J.; Welton, Tom; Parker, David G.

doi:10.1039/a807447j

Cited by 251 publications

(140 citation statements)

References 9 publications

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“…There is a very rapid early phase of solvation in all of these solvents, which is consistent with our previous suggestion that the organic cation, at least for imidazoliumbased ionic liquids, dominates the early-time solvation behavior 41 (Table 1). Furthermore, it is reasonable to assume that symmetrical nonpolar inorganic anions such as Cl -, BF 4 -, and PF 6 -play a negligible role in the solvation of the coumarin probe. We are cautious, however, to extend this conclusion to the NTf 2 -anion, which is polar, polarizable, large, and flexible.…”

Section: Resultsmentioning

confidence: 99%

“…They have been used as novel solvent systems for organic synthesis, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] liquid-liquid extraction, [15][16][17] and electrochemical studies 18 and as ultralow volatility liquid matrixes for matrix-assisted laser desorption/ ionization (MALDI) mass spectrometry. 19 RTILs have many properties that make their applications in chemical systems attractive.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Solvation in Imidazolium-Based Ionic Liquids on Short Time Scales

et al. 2006

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Steady-state and time-resolved Stokes shift data for the probe coumarin 153 in two imidazoles, six imidazolium-based ionic liquids, and several other solvents are presented. These results are consistent with our original suggestion (J. Phys. Chem. B 2004, 108, 10245−10255) that initial solvation is dominated by the organic moiety of the ionic liquid, and they show that for the imidazole-based liquids initial solvation is in all cases very rapid. Solvation by methylimidazole and butylimidazole is complete in 100 ps, and all of the imidazolium ionic liquids demonstrate similarly rapid initial solvation. Owing to the importance of determining the amount of initial solvation that is missed in a given experiment with finite time resolution, we discuss a method of estimating the intramolecular contribution to the reorganization energy. This method yields 2068 cm-1 and is compared with an alternative method. ReceiVed: February 1, 2006; In Final Form: May 18, 2006 Steady-state and time-resolved Stokes shift data for the probe coumarin 153 in two imidazoles, six imidazoliumbased ionic liquids, and several other solvents are presented. These results are consistent with our original suggestion (J. Phys. Chem. B 2004, 108, 10245-10255) that initial solvation is dominated by the organic moiety of the ionic liquid, and they show that for the imidazole-based liquids initial solvation is in all cases very rapid. Solvation by methylimidazole and butylimidazole is complete in 100 ps, and all of the imidazolium ionic liquids demonstrate similarly rapid initial solvation. Owing to the importance of determining the amount of initial solvation that is missed in a given experiment with finite time resolution, we discuss a method of estimating the intramolecular contribution to the reorganization energy. This method yields 2068 cm -1 and is compared with an alternative method.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Solvation in Imidazolium-Based Ionic Liquids on Short Time Scales

et al. 2006

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“…In particular, the air and moisture stable system 4 ] has been used for the multiphase hydrogenations of arenes. [77] Transition-metal NPs dispersed in imidazolium ionic liquids are active catalysts for various reactions (Table 1) such as the hydrogenation of alkenes, arenes, and ketones. In most of these cases, the catalytic reactions are typically multiphase systems in which the MNPs, dispersed in the ILs, form the denser phase and the substrates and product remains in the upper-phase; hence the ionic catalytic solution is easily recovered by simple decantation.…”

Section: Catalytic Reactionsmentioning

confidence: 99%

Catalytic Applications of Metal Nanoparticles in Imidazolium Ionic Liquids

Migowski

Dupont

2006

Chemistry A European J

432

241

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Metal nanoparticles (MNPs) with a small diameter and narrow size distribution can be prepared by H2 reduction of metal compounds or decomposition of organometallic species dissolved in ionic liquids (ILs). MNPs dispersed in ILs are catalysts for reactions under multiphase conditions. These soluble MNPs possess a pronounced surfacelike rather than single‐site like catalytic properties. In other cases the MNPs are not stable and tend to aggregate or serve as reservoirs of mononuclear catalytically active species.

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“…Estes líquidos iônicos vêm sendo cada vez mais utilizados em diversos campos do conhecimento. Por exemplo, pode-se citar o seu uso como solventes em catálise bifásica 15,[17][18][19][20][21][22][23] , em eletroquímica 24,25 , como solventes para extração líqui-do-líquido 26 , como solventes para reações orgânicas 11 , como fase estacionária para cromatografia gasosa 27 , entre outros. Uma característica peculiar destes líquidos iônicos é a grande variação de suas propriedades físico-químicas tanto em função da natureza do ânion presente como dos substituintes alquila do anel imidazólio.…”

Section: Esquemaunclassified