Chlorobis(ethylene)rhodium dimer

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Chlorobis(ethylene)rhodium dimer
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.031.938 Edit this at Wikidata
EC Number
  • 235-145-0
UNII
  • InChI=1S/4C2H4.2ClH.2Rh/c4*1-2;;;;/h4*1-2H2;2*1H;;/p-2
    Key: QPOCZCJMFQWGSP-UHFFFAOYSA-L
  • C=C.C=C.C=C.C=C.[Cl-].[Cl-].[Rh].[Rh]
Properties
C8H16Cl2Rh2
Molar mass 388.93
Appearance red solid
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319
P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Chlorobis(ethylene)rhodium dimer is an

homogeneous catalysts have been prepared from this complex.[1][2]

Preparation and reactions

The complex is prepared by treating an aqueous

rhodium trichloride with ethylene at room temperature. Rh(III) is reduced with oxidation of ethylene to acetaldehyde
:

2 RhCl3(H2O)3 + 6 C2H4 → Rh2Cl2(C2H4)4 + 2 CH3CHO + 4 HCl + 4 H2O

Reflecting the lability of its ligands, the complex does not tolerate recrystallization.[3]

The complex reacts slowly with water to give acetaldehyde. With HCl, it gives RhCl2(C2H2)2−. Rh2Cl2(C2H4)4 catalyzes the

1-butene
.

Carbonylation affords rhodium carbonyl chloride. Treatment with acetylacetone and aqueous KOH gives Rh(acac)(C2H4)2.

References

  1. doi:10.1021/ja012711i
  2. ISBN 9780470842898
    .
  3. doi:10.1002/9780470132463.ch4
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