Green, Transition-Metal-Free Catalysts: An Efficient Reusable Organocatalyst in Oxidation of Cylohexene by Oxaziridines

Interaction of 2-[(2-Hydroxy-benzylidene)-amino]-3-(4-hydroxy-phenyl)-propionic acid ligand with modified silica gel leads to immobilization of the ligand onto a modified silica gel surface, through the reactive (3-chloropropyl)-trimethoxysilane group. This heterogeneous catalyst was found to be an efficient heterogeneous catalyst for oxidation of cyclohexene in the presence of H2O2 as an oxidant and CH3CN as a solvent. The heterogeneous catalyst could be recovered easily and reused three times, without significant loss of its catalytic activity.