An Ionic Liquid on a Porous Organic Framework Support: A Recyclable Catalyst for the Knoevenagel Condensation in an Aqueous System

Abstract

Porous aromatic frameworks (PAFs) that feature a high density of phenyl rings in their robust frameworks are attractive platforms for catalysis because of their extremely high stability, high surface area, and adjustable pore size. In this paper, two PAF‐supported ionic liquids were constructed by introducing ionic liquid units onto the framework of a PAF material PAF‐111 using a series of stepwise post‐synthetic modifications. The basic PAF‐supported ionic liquid with a hydroxy anion exhibited high catalytic activity and high stability, and could undergo at least 10 cycles without any activity loss when catalyzing Knoevenagel condensation reaction under aqueous conditions. It is expected that our study will further promote the development of designing and applying functional PAF materials for catalysis in aqueous systems.

Organic porous heterogeneous composite with antagonistic catalytic sites as a cascade catalyst for continuous flow reaction

“…Additionally, 120-MI@Cl exhibited lower activity in comparison to 120-MI@OH, which may be attributed to its weaker basicity compared to 120-MI@OH. 74 …”

“…Additionally, 120-MI@Cl exhibited lower activity in comparison to 120-MI@OH, which may be attributed to its weaker basicity compared to 120-MI@OH. 74 We also probed the kinetics of the reaction and determined the completion of the cascade catalysis. From Fig.…”

Construction of catalytic cavities in porous aromatic frameworks for effective alcohol oxidation

“…23,24 The former leads to catalysts with simple sites and functions such as acidic catalysts, base catalysts, metal site catalysts, etc. 5,[25][26][27] The latter requires the design of porous materials, and in this case, mesoporous skeletons were widely exploited. However, in order to achieve specic catalysis for an extensive range of organic transformations, bulky molecules as catalytic sites are still required.…”