A new class of ultrastable dual hydrogen-bond-donor COF for improving the reaction activity

Dual hydrogen-bond-donor (HBD) molecules attracted considerable attention in the area of organocatalysts. Here, a novel and stable dual HBD TBP-COF has been developed by structural transformation from TB-COF by locking the reversible bond to form a heterocycle. The obtained dual HBD COF showed excellent hydrogen bond catalytic performance in promoting the Friedel-Crafts reaction. Postsynthetic engineering endows TBP-COF with exceptional stability, demonstrating 90% activity retention over 20 catalytic cycles.