(Cymene)ruthenium dichloride dimer
|Molar mass||612.38 g·mol−1|
|Melting point||247 to 250 °C (477 to 482 °F; 520 to 523 K) (decomposes)|
|Slightly, with hydrolysis|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is: / ?)(|
(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. 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.
[(cymene)RuCl2]2 is also used to prepare catalysts (by monomerization with dppf) used in borrowing hydrogen catalysis, a catalytic reaction that is based on the activation of alcohols towards nucleophilic attacks.
- Bennett, M. A.; Huang, T. N.; Matheson, T. W. , Smith, A. K. "(η6-Hexamethylbenzene)ruthenium Complexes", Inorganic Syntheses, 1982, volume 21, pages 74–78.
- Takao Ikariya, Shohei Hashiguchi, Kunihiko Murata, and Ryōji Noyori (2005). "Preparation of Optically Active (R,R)-Hydrobenzoin from Benzoin or Benzil". Org. Synth.: 10.
- Hamid et al.; Advanced Synthesis & Catalysis Volume 349, Issue 10, pages 1555–1575, July 2, 2007; doi:10.1002/adsc.200600638