Highly Dispersed Pd Catalyst Locked in Knitting Aryl Network Polymers for Suzuki–Miyaura Coupling Reactions of Aryl Chlorides in Aqueous Media

The porous materials with high surface area have attracted signifi cant scientifi c attention due to their diverse potential applications in separation, [ 1,2 ] heterogeneous catalysis, [ 3 ] and gas storage. [ 4–8 ] During the last few decades, the surge to develop such useful materials has led scientists to prepare a number of novel porous materials such as metal organic frameworks (MOFs), [ 9 ] porous organic cages, [ 10 ] and microporous organic polymers (MOPs), [ 11 ] in addition to traditional porous materials such as zeolites and activated carbon. Among these porous materials, MOPs have attracted particular attention due to their unique properties such as large surface area, low skeletal density, and high chemical stability. One particular advantage of MOPs is to introduce a broad range of useful chemical functionalities within the porous framework. The introduction of Troger’s base into conjugated microporous polymers (CMPs) for heterogeneous catalysis is an early example in this regard. [ 12 ] The use of metal-organic CMPs has been demonstrated for heterogeneous catalysis, [ 13 ] and highly stable and porous cross-linked polymers are reported as effi cient photocatalysts. [ 14 ] In addition, microporous phthalocyanine polymer with metal ions [ 15–17 ] and covalent organic frameworks (COFs) with palladium catalysts [ 18 ] have also been studied for heterogeneous catalysis reactions. However, the application of MOPs as heterogeneous catalysts is relatively limited due to high-cost, for instance, noble metals catalysts are themselves consumed in preparation of such materials. [ 13 , 15 ] Hence, economical mass production of MOPs as heterogeneous catalysts remains a formidable challenge.