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

In order to elucidate the reaction mechanism of ionic liquid-catalyzed CO 2 with 2-aminobenzonitrile, [P 4442 ] 2 [Hy] with two N - sites is designed for the efficient preparation of quinazoline-2,4(1 H ,3 H )-diones. The results show that [Hy] 2- can activate 2-aminobenzonitrile by hydrogen bonding with -NH 2 in addition to activating CO 2 , and the key intermediate is revealed.