Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202204472
Keywords
Dianions; Low Oxidation States; Magnesium; Reductions; Umpolung
Categories
Funding
- University of St Andrews
- EPSRC [EP/N509759/1]
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The study presents a new magnesium complex containing a stable dianion of an aliphatic ketone. The complex undergoes reduction reactions or CH activation reactions when reacted with aliphatic ketones.
The new beta-diketimine (iPrDip)nacnacH, HC(iPrCNDip)(2)H, Dip=2,6-iPr(2)-C6H3, was converted to the magnesium(I) complex [{((iPrDip)nacnac)Mg}(2)] and reaction with 2-adamantanone (OAd) afforded the ketone-1,2-diide complex [{((iPrDip)nacnac)Mg}(2)(mu-OAd)]. The complex contains the first stable dianion of an aliphatic ketone with an electropositive metal and shows an OAd(2-) unit with long C-O bond and pyramidal carbon centre. DFT studies reveal an anionic charge on both neighbouring C and O atoms. Reductions of aliphatic ketones with magnesium(I) complexes show that these likely proceed via highly reactive dianions and afforded a 1 : 1 mixture of an alkoxide and an enolate when an enolisable ketone was used, and rapid CH activations reactions, e.g., of stabilising ligand moieties, when non-enolisable ketones were employed.
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