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(cymene)ruthenium Dichloride Dimer

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Title: (cymene)ruthenium Dichloride Dimer  
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Subject: Transfer hydrogenation, Bridging ligand, Sandwich compound, Martin A. Bennett, Organoruthenium chemistry
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(cymene)ruthenium Dichloride Dimer

(cymene)ruthenium dichloride dimer
CAS number 52462-29-0 YesY
ChemSpider 8297222 YesY
Jmol-3D images Image 2
Molecular formula C20H28Cl4Ru2
Molar mass 612.39 g mol−1
Appearance Red solid
Melting point

247-250 °C (decomp.)

Solubility in water Slightly, with hydrolysis
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.


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