Cyclohexene oxidation with an iron cyclam-type complex encapsulated in Y-zeolite

The synthesis and characterization of an iron cyclam-type complex within the cavities of a Y-zeolite is described. By comparing the performance of the heterogeneous system with the free complex in the oxidation of cyclohexene using iodosylbenzene as oxygen donor, a protection effect of the matrix over the active center was evidenced by a higher turnover and yield of products. It was possible to determine, by UV-VIS spectroscopy, that the free complex suffers molecular degradation after two hours of reaction whereas the heterogeneous catalyst remains unaltered and active after 24 hours of reaction. The main products found in the catalyzed reaction were 2-cyclohexen-1-ol, 2-cyclohexen-1-one, epoxycyclohexane and cyclohexanol.