Copper nanoparticles supported on highly nitrogen‐rich containing covalent organic polymers as heterogeneous catalyst for ipso-hydroxylation of phenyl boronic acid to phenol
This work describes a simple procedure for the synthesis of highly nitrogen‐rich containing covalent organic polymers using commercial available starting material like melamine and cyanuric chloride as a solid heterogeneous catalyst Cu/TCOP under solvothermal conditions. The structural properties of the as-synthesized solid heterogeneous catalyst were determined by X-ray diffraction (XRD), diffused reflectance spectroscopy, Fourier transformed infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy(EDS), 13C-CP MAS nuclear magnetic resonance spectroscopy and X-ray photo electron spectroscopy. The catalytic activity of Cu/TCOP was investigated by focusing on oxidation of phenylboronic acid under atmospheric conditions in aqueous medium to get very good yield up to 99%. The reaction performance have been evaluated considering the effect of various parameters such as amount of catalyst, reaction time, temperature, amount of base and solvent. The Cu/TCOP catalyst is completely recoverable in a facile manner from the reaction mixture and the efficiency of the copper nano catalyst was recovered for after five cycles.