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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 .
Dicobalt octacarbonyl is used commercially for hydroformylation of alkenes. A key intermediate is cobalt tetracarbonyl hydride (HCo(CO) 4). Processes involving cobalt are practiced commercially mainly for the production of C7-C14 alcohols used for the production of surfactants.
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]
The Nicholas reaction is an organic reaction where a dicobalt octacarbonyl-stabilized propargylic cation is reacted with a nucleophile. Oxidative demetallation gives the desired alkylated alkyne. [1] [2] It is named after Kenneth M. Nicholas. The Nicholas reaction. Several reviews have been published. [3] [4]
In fact the cobalt derivative of this octacarbonyl is the only stable member, but all three tetramers are well known: Co 4 (CO) 12, Rh 4 (CO) 12, Rh 6 (CO) 16, and Ir 4 (CO) 12. Co 2 (CO) 8 unlike the majority of the other 18 VE transition metal carbonyls is sensitive to oxygen. Group 10 elements with 10 valence electrons form tetracarbonyls ...
The Pauson–Khand (PK) reaction is a chemical reaction, described as a cycloaddition.In it, an alkyne, an alkene, and carbon monoxide combine into a α,β-cyclopentenone in the presence of a metal-carbonyl catalyst [1] [2] Ihsan Ullah Khand (1935–1980) discovered the reaction around 1970, while working as a postdoctoral associate with Peter Ludwig Pauson (1925–2013) at the University of ...
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An alkyne trimerisation is a [2+2+2] cycloaddition reaction in which three alkyne units (C≡C) react to form a benzene ring. The reaction requires a metal catalyst. The process is of historic interest as well as being applicable to organic synthesis. [1] Being a cycloaddition reaction, it has high atom economy.