Aluminium-Mediated Carbon Dioxide Reduction by an Isolated Monoalumoxane Anion.

The deoxygenative conversion of carbon dioxide to carbon monoxide is promoted by the aluminyl anion [Al(NONAr )]- (NONAr =[O(SiMe2 NAr)2 ]2- , Ar=2,6-iPr2 C6 H3 ). The reaction proceeds via the isolable monoalumoxane anion [Al(NONAr )(O)]- , containing a terminal aluminum-oxygen bond. This species reacts with a second equivalent of carbon dioxide to afford the carbonate [Al(NONAr )(CO3 )]- , and with nitrous oxide to generate the hyponitrite anion, [Al(NONAr )(κ2 O,O'-N2 O2 )]- .