New Carbon‐Carbon Bond Forming Reactions Promoted by Aluminyl and Alumoxane Anions: Introducing the Ethenetetraolate Ligand

: [K{Al(NON Dipp )}] 2 (NON Dipp = [O(SiMe 2 NDipp) 2 ] 2- , Dipp = 2,6- i Pr 2 C 6 H 3 ) reacts with CS 2 to afford the trithiocarbonate species [K(OEt 2 )][Al(NON Dipp )(CS 3 )] 1 or the ethenetetrathiolate complex, [K{Al(NON Dipp )(S 2 C)}] 2 [ 3 ] 2 . The dimeric alumoxane [K{Al(NON Dipp )(O)}] 2 reacts with carbon monoxide to afford the oxygen analogue of 3 , [K{Al(NON Dipp )(O 2 C)}] 2 [ 4 ] 2 containing the hitherto unknown ethenetetraolate ligand, [C 2 O 4 ] 4- .