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Issue 19, 2017
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Adamantyl metal complexes: new routes to adamantyl anions and new transmetallations

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Abstract

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-Ad2Zn and 2-Ad2Zn, isolable free of solvent and salt impurities. Addition of 2,2′-bipyridine (bipy) leads to the crystalline adducts 1-Ad2Zn(bipy) and 2-Ad2Zn(bipy), which were structurally characterized. The resulting adamantyl anions were used in order to generate the first adamantyl complexes of mercury (1- and 2-Ad2Hg), gold (1- and 2-AdAu(PPh3), 1- and 2-AdAu(PCy3)) and bismuth (2-Ad2BiBr), of which 1- and 2-Ad2Hg, 2-AdAu(PPh3), 2-AdAu(PCy3), and 2-Ad2BiBr were isolated. These include the first structurally characterized unsupported 2-adamantyl metal complexes.

Graphical abstract: Adamantyl metal complexes: new routes to adamantyl anions and new transmetallations

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Supplementary files

Article information


Submitted
03 Feb 2017
Accepted
18 Apr 2017
First published
19 Apr 2017

Dalton Trans., 2017,46, 6212-6217
Article type
Paper

Adamantyl metal complexes: new routes to adamantyl anions and new transmetallations

D. Armstrong, F. Taullaj, K. Singh, B. Mirabi, A. J. Lough and U. Fekl, Dalton Trans., 2017, 46, 6212
DOI: 10.1039/C7DT00428A

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