Extending chain growth beyond C 1 → C 4 in CO homologation: aluminyl promoted formation of the [C 5 O 5 ] 5- ligand.
Matthew J EvansMichael G GardinerMathew D AnkerMartyn P ColesPublished in: Chemical communications (Cambridge, England) (2022)
(NON Dipp )Al-K(TMEDA) 2 (NON Dipp = [O(SiMe 2 NDipp) 2 ] 2- , Dipp = 2,6- i Pr 2 C 6 H 3 ), containing an Al-K bond, activates and reductively couples cabon monoxide gas to form the [C 4 O 4 ] 4- ligand. This oxocarbon anion is thermally isomerised in the presence of CO and TMEDA. In contrast, the dimeric potassium aluminyl [K{Al(NON Dipp )}] 2 yields an aluminium complex containing the hitherto unknown [C 5 O 5 ] 5- ligand.