Grafting of the new unsymmetrical salamo complex of Mn (II) on MCM-41 and its use as a heterogeneous catalyst for the epoxidation of alkenes in the presence of H2O2 as an oxidant
摘要
The new Mn (II) complex of the “salamo” salen ligand of unsymmetrical oxime was synthesized and immobilized on MCM-41 by the multi-grafting method. The immobilized unsymmetrical salamo complex of manganese (MCM-41-Mn salamo) was used as a catalyst in the epoxidation of the alkenes with H2O2. The effect of various reaction parameters which may affect the conversion such as reaction time, temperature, amount of catalyst, oxidant and imidazole was investigated. The prepared Mn catalyst exhibited excellent reusability and could be reused at least five times without significant leaching or loss of activity.