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Adamantyl metal complexes: new routes to adamantyl anions and new transmetallations.
New routes to 1- and 2-adamantyl anion equivalents are described, starting from commercially available 1- and 2-adamantylzinc bromides and employing reducing metals (Mg; Li). Adamantylmagnesium bromides (both 1-AdMgBr and 2-AdMgBr) can reliably be produced via reaction of the corresponding adamantylzinc bromides with excess magnesium metal. Reactions of adamantylzinc bromides with stoichiometic lithium biphenylide or lithium 2,2'-bipyridylide afford the new diadamantylzinc species, 1-Ad2 Zn and 2-Ad2 Zn, isolable free of solvent and salt impurities. Addition of 2,2'-bipyridine (bipy) leads to the crystalline adducts 1-Ad2 Zn(bipy) and 2-Ad2 Zn(bipy), which were structurally characterized. The resulting adamantyl anions were used in order to generate the first adamantyl complexes of mercury (1- and 2-Ad2 Hg), gold (1- and 2-AdAu(PPh3 ), 1- and 2-AdAu(PCy3 )) and bismuth (2-Ad2 BiBr), of which 1- and 2-Ad2 Hg, 2-AdAu(PPh3 ), 2-AdAu(PCy3 ), and 2-Ad2 BiBr were isolated. These include the first structurally characterized unsupported 2-adamantyl metal complexes.
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