MarketBis(cyclooctadiene)nickel(0)
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Bis(cyclooctadiene)nickel(0)

Bis(cyclooctadiene)nickel(0) is the organonickel compound with the formula Ni(C8H12)2, also written Ni(cod)2. It is a diamagnetic coordination complex featuring tetrahedral nickel(0) bound to the alkene groups in two 1,5-cyclooctadiene ligands. This highly air-sensitive yellow solid is a common source of Ni(0) in chemical synthesis.

Preparation and properties
The complex is prepared by reduction of anhydrous nickel(II) acetylacetonate in the presence of the diolefin: :Ni(acac)2 + 2 cod + 2 AlEt3 → Ni(cod)2 + 2 acacAlEt2 + C2H6 + C2H4 Ni(cod)2 is moderately soluble in several organic solvents. If exposed to air, the solid oxidizes in a few minutes to nickel(II) oxide. As a result, this compound is generally handled in a glovebox. ==Reactions==
Reactions
The reactivity of Ni(cod)2 has been extensively examined. One or both 1,5-cyclooctadiene ligands are readily displaced by phosphines, phosphites, bipyridine, and isocyanides. Oxidation gives the highly reactive monocation, which can be isolated when using weakly coordinating anions: : Of its many catalytic reactions, : ==References==
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