Tunable porous doped carbon nanospheres as a robust host for immobilization of metal nanoparticles for aerobic oxidative synthesis of aryl nitriles

Aromatic and aliphatic nitriles as a useful molecular scaffolds are an important part of pharmaceuticals, agrochemicals and fine chemicals. Up to now several nitrile-containing compounds were in clinical developments.1 In the past decades, different transition metal-catalyzed protocols have been developed for the synthesis of aryl nitriles. Palladium, nickel and copper catalysts have shown to be effective for cyanation of aryl halides and organometallic reagents.2 Various metal, metalloid-bound cyanide materials and nonmetallic "CN" units have been reported as CN precursors in the cyanation reactions. Recently, direct cyanation of aryl C-H bonds via transition metal-catalyzed process have been used as attractive method for the synthesis of organic nitriles.2 We have prepared highly monodispersed, nitrogen-doped porous carbon nanospheres as a solid ligand for generation of Ag nanoparticles for oxidative synthesis of nitriles, directly from alcohols and ammonia as nitrogen source (Fig. 1). Synthesis of carbon spheres and nitrogen doping was proceeded in one step via hydrothermal method. Generally, nitrogen doping provide basic properties, which can enhance the interaction between substrates and carbon surfaces. Guanidine was used as nitrogen source in the doping procedure.

کلیدواژه ها:

Tunable N-doped carbon spheres ، Aryl nitriles ، Porous carbon catalyst ، Ag nanoparticles