Alkene epoxidation by manganese(III) complexes immobilized onto nanostructured carbon CMK-3

► New catalysts were prepared by immobilization of Mn(III) complexes onto CMK-3. ► Microwave-assisted protocol was used in the immobilization of the Mn(III) complexes. ► All heterogeneous catalysts were active and selective in the epoxidation of alkenes. ► Greener catalytic procedures using H2O2 oxidant and ethanol were tested with success.