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DICARBONYLCYCLOPENTADIENYLCOBALT

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DICARBONYLCYCLOPENTADIENYLCOBALT Basic information

Product Name:
DICARBONYLCYCLOPENTADIENYLCOBALT
Synonyms:
  • Cobalt cyclopentadienyl dicarbonyl
  • Cobalt, dicarbonyl-pi-cyclopentadienyl-
  • Cyclopentadienyldicarbonylcobalt
  • Dicarbonyl(eta5-cyclopentadienyl)cobalt
  • Dicarbonyl-pi-cyclopentadienyl cobalt
  • eta5-Cyclopentadienylcobalt dicarbonyl
  • pi-Cyclopentadienylcobalt dicarbonyl
  • pi-Cyclopentadienyldicarbonylcobalt
CAS:
12078-25-0
MF:
C7H5CoO25*
MW:
180.05
EINECS:
235-139-8
Product Categories:
  • metallocene
Mol File:
12078-25-0.mol
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DICARBONYLCYCLOPENTADIENYLCOBALT Chemical Properties

Melting point:
-22 °C
Boiling point:
139-140 °C710 mm Hg(lit.)
Density 
1.35
refractive index 
1.599-1.602
Flash point:
80 °F
storage temp. 
2-8°C
form 
liquid
color 
dark red
Specific Gravity
1.35
Water Solubility 
Insoluble in water. Soluble in common organic solvents.
Sensitive 
Air Sensitive
NIST Chemistry Reference
Cobalt, dicarbonyl(«eta»5-2,4-cyclopentadien-1-yl)-(12078-25-0)
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Safety Information

Hazard Codes 
T
Risk Statements 
10-23/24/25-42/43-53-68-40
Safety Statements 
23-36/37-45-38-36/37/39-28A-16
RIDADR 
UN 1992 3/PG 3
WGK Germany 
3
10-23
HazardClass 
6.1
PackingGroup 
II
HS Code 
29319090

MSDS

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DICARBONYLCYCLOPENTADIENYLCOBALT Usage And Synthesis

Reactions

  1. Volatile cobalt complex used for the deposition of cobalt and cobalt oxide films.
  2. Intramolecular cobalt-catalyzed [2+2+2] cycloaddition of O-protected diyne-cycanohydrins.
  3. Catalyst used for the dehydrative direct CH allylation with allylic alcohols.

Chemical Properties

dark red to brown liquid

Uses

Dicarbonylcyclopentadienylcobalt Catalyst for the cyclotrimerization of alkynes. It mediates the [2+2+2]-cyclization of allenediynes to tricyclic systems. catalyzes the formation of pyridines from a mixture of alkynes and nitriles.

Purification Methods

Best distilled in an atmosphere of CO in a vacuum. The red brown liquid decomposes slightly on distillation even in a vacuum to liberate some CO. Operations should be performed in an efficient fume cupboard. It is soluble in organic solvents and stable in air but decomposes slowly in sunlight and rapidly under UV. [Piper et al. J Inorg Nucl Chem 1 165 1955, Beilstein 16 IV 1827.] TOXIC.

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