Astatine is the least reactive of the halogen elements and it is assumed to behave similarly to iodine. As it has such a short half-life no crystal structures of its compounds exist and very few compounds have been identified at all. Compounds of astatine with palladium are known and their relatives - palladium iodides - are incredible versatile reagents for organic synthesis. For instance this compound was developed to help modify aromatic compounds.
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