Facile synthesis of a new covalent organic framework (COF-AYLIN) based on polyamide links and their application in C[sbnd]N coupling reaction

Abstract

Among the reactions, CN coupling is one of the most important and important reactions that have taken a significant part in the industry. This study defines the design/preparation of an eco-friendly recyclable catalyst for CN coupling reaction. For this target, a new policy was designed to manufacture a new amide-based COF via the reaction amid benzidine and Benzene-1,3,5-tricarboxylic acid (BTC). BTC was activated with carbonyl diimidazole (CDI) and then reacted with benzidine for the synthesis of favorable COF (i.e., COF-AYLIN). Subsequent, the as-prepared COF was decorated via palladium ions to synthesize Pd/COF-AYLIN. The synthesized compounds were identified through the required techniques including N2 isotherms, TEM, EDX FT-IR, XRD, SEM, ICP-OES and TG-DTA. The computer simulation results possess suggested multi sheets of the 2D framework of COF-AYLIN. Consequently, It was found that palladium ions are placed between the layers and on the COF surfaces. This nanocatalyst was used in CN Cross-Coupling reaction and showed its usage in a diverse range of different functional groups with good efficiency. The reason for introducing this catalyst system is because of its advantages such as considerably high selectivity, almost complete conversion of products, good turnover frequency (TOF), high yield, convenient separation of catalyst and product. The results show that the highest efficiency of the product in the reaction was obtained in the shortest possible time with the use of Pd/COF-AYLIN.