(Cymene)ruthenium dichloride dimer
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| Names | |
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| Other names
Dichloro(p-cymene)ruthenium(II) dimer
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| Identifiers | |
52462-29-0  |
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| ChemSpider | 8297222 |
| Jmol 3D model | Interactive image Interactive image |
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| Properties | |
| C20H28Cl4Ru2 | |
| Molar mass | 612.38 g·mol−1 |
| Appearance | Red solid |
| Melting point | 247 to 250 °C (477 to 482 °F; 520 to 523 K) (decomposes) |
| Slightly, with hydrolysis | |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
(Cymene)ruthenium dichloride dimer is the organometallic compound with the formula [(cymene)RuCl2]2. This red-coloured, diamagnetic solid is a reagent in organometallic chemistry and homogeneous catalysis.
Preparation and reactions
The dimer is prepared by the reaction of the phellandrene with hydrated ruthenium trichloride.[1] Upon heating, [(cymene)RuCl2]2 undergoes exchange with other arenes, releasing free p-cymene. This dimeric molecule cleaves easily in the presence of Lewis bases to give monomeric adducts:
- [(cymene)RuCl2]2 + 2 PPh3 → 2 (cymene)RuCl2(PPh3)
Such monomers adopt pseudo-octahedral piano-stool structures.
Treatment of [(cymene)RuCl2]2 with the chelating anionic ligand precursor TsDPENH gives (cymene)Ru(TsDPEN-H), a catalyst for asymmetric transfer hydrogenation.[2]
New catalysts
[(cymene)RuCl2]2 is also used to prepare catalysts (by monomerization with dppf) used in borrowing hydrogen catalysis,[3] a catalytic reaction that is based on the activation of alcohols towards nucleophilic attacks.
References
- ↑ Bennett, M. A.; Huang, T. N.; Matheson, T. W. , Smith, A. K. "(η6-Hexamethylbenzene)ruthenium Complexes", Inorganic Syntheses, 1982, volume 21, pages 74–78.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Hamid et al.; Advanced Synthesis & Catalysis Volume 349, Issue 10, pages 1555–1575, July 2, 2007; doi:10.1002/adsc.200600638
