Efficient catalytic conversion of CO2 to quinazoline-2,4(1H,3H)-diones by a dual-site anion-functionalized ionic liquid: reconsidering the mechanism

[P 4442 ] 2 [Hy] can simultaneously activate CO 2 and 2-aminobenzonitrile due to the two N − sites. The H-bond site of [Hy] 2− with 2-aminobenzonitrile is confirmed to be –NH 2 , and the key reaction intermediate is proposed and the mechanism is reconsidered.