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Dicobalt octacarbonyl is an organocobalt compound with composition Co 2 (CO) 8. This metal carbonyl is used as a reagent and catalyst in organometallic chemistry and organic synthesis , and is central to much known organocobalt chemistry .
The addition of dicobalt octacarbonyl to the alkyne of propargylic ether (1) gives the dicobalt intermediate 2. Reaction with tetrafluoroboric acid or a Lewis acid gives the key dicobalt octacarbonyl-stabilized propargylic cation (3a and 3b). Addition of a nucleophile followed by a mild oxidation gives the substituted alkyne (5). The likely ...
Organocobalt compounds are involved in several organic reactions and the important biomolecule vitamin B 12 has a cobalt-carbon bond. Many organocobalt compounds exhibit useful catalytic properties, the preeminent example being dicobalt octacarbonyl. [1]
Transition metal alkyne complexes are often formed by the displacement of labile ligands by the alkyne. For example, a variety of cobalt-alkyne complexes arise by the reaction of alkynes with dicobalt octacarbonyl. [2] Co 2 (CO) 8 + R 2 C 2 → (R 2 C 2)Co 2 (CO) 6 + 2 CO. Many alkyne complexes are produced by reduction of metal halides: [3]
It can be formed through the reaction between dicobalt octacarbonyl and iodine azide. [1] Co 2 (CO) 8 + 4IN 3 → 2Co(N 3) 2 + 8CO + 2I 2. Properties.
The reaction is catalyzed by triphenylchromium tri-tetrahydrofuranate [17] or by a complex of triisobutylaluminium and titanium tetrachloride. [18] Trimerisation of three diphenylacetylene molecules yields hexaphenylbenzene. The reaction is catalyzed by dicobalt octacarbonyl. [19]
Metal carbonyls are used in a number of industrially important carbonylation reactions. In the oxo process, an alkene, hydrogen gas, and carbon monoxide react together with a catalyst (such as dicobalt octacarbonyl) to give aldehydes. Illustrative is the production of butyraldehyde from propylene: CH 3 CH=CH 2 + H 2 + CO → CH 3 CH 2 CH 2 CHO
The reactions work best when the solvent is basic (such as pyridine). [23] [24] In the case of dicobalt octacarbonyl or Co 2 (CO) 8 as a catalyst, pentan-3-one can arise from ethene and CO, in the absence of hydrogen.