Cu@MTPOF as an Efficient Catalyst for the C–S Coupling of 2-Mercaptobenzimidazole with Aryl Halides and 2-Halobenzoic Acids

The porous organic framework has been receiving significant attention for the past few years because of its various applications, including heterogeneous catalysis. The catalytic activity of the parent porous organic framework is often increased by incorporating or doping metal ions in the framework. In this context, copper has been loaded in a melamine–terephthaldehyde based porous organic framework (MTPOF), and its catalytical activity is successfully examined for the C–S coupling reaction of 2-mercaptobenzimidazole with aryl halides and 2-halobenzoic acids. The MTPOF is synthesized by reacting melamine with terephthaldehyde, and then the copper acetate is integrated in the framework. The MTPOF and Cu@MTPOF have been characterized by FTIR, SEM, EDS, solid-state NMR, BET, TGA-DTG, and XPS analysis. It has been found that Cu@MTPOF is quite effective in catalyzing C–S coupling reaction with Cu@MTPOF, which is effortlessly recuperated and reused multiple times without much change in catalytic activity. Graphical Abstract