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The allyl ligand is commonly encountered in organometallic chemistry.
Most commonly, allyl ligands bind to metals via all three carbon centers, the so-called η < sup > 3 </ sup >- binding mode.
η < sup > 1 </ sup >- allyl complexes are also known.
The most popular allyl reagent is probably allyl palladium chloride.
They are usually generated by oxidative addition of allylic halides.
This route affords pi-allyl nickel compounds, such as ( allyl )< sub > 2 </ sub > Ni < sub > 2 </ sub > Cl < sub > 2 </ sub >:

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