Abstract: Without the additional involvement of axial ligand and organic solvent, the ionic manganese porphyrin [Mn^Ⅲ(BF₄)T(N-Me-4-Py)P][BF₄]₄(1d) immobilized in [BMIM]BF₄ efficiently catalyzed the oxidation of styrene with a good activity(87% conv.) and epoxide selectivity(90%) under mild reaction conditions. The generality of 1d-[BMIM]BF₄ system to the substrates of styrene derivatives with different electronical effects also lead to the pleasing results. The degradation of metalloporphyrin coming from the π-π stacking of porphyrin itself and the oxidation destruction was greatly suppressed in this built-up 1d-[BMIM]BF₄ system.

Key words: Porphyrin, Ionic liquid, Styrene, Catalytic oxidation