Manganese (III) salen immobilized on montmorillonite as biomimetic alkene epoxidation and alkane hydroxylation catalyst with sodium periodate

Epoxidation of Styrene with H2O2 Catalyzed by Alanine–Salicylaldehyde Schiff Base Chromium (III) Complexes Immobilized on Mesoporous Materials

“…Among the various transition metal complexes reported [9][10][11][12][13][14][15][16][17], the amino acid Schiff base complexes have been proven to be excellent catalysts for catalytic epoxidation [13,14]. However, such homogeneous complexes suffer from the drawbacks of poor catalyst recovery and product separation [18]. Thus, in the past decade, much effort has been paid to immobilize the homogeneous catalysts onto various supports, especially the siliceous mesoporous materials [19][20][21].…”

Epoxidation of Cyclohexene with Air over the Composite Catalysts of Mn-mont Coordinated with Ligands

“…Yang Guoyu et al [17] compared the catalytic epoxidation activity of ship-in-abottle and anchored heterogenized manganese Schiff-base complexes. Manganese salen complexes immobilized on activated carbon [19], polymer [27] or montmorillonite [28] can also be used as a heterogeneous catalyst for the epoxidation of alkenes. Montmorillonite is a clay mineral belonging to the group of smectites.…”

Self-assembled Solvent-regulated Phase Transfer Catalyst for Epoxidation of Non-functionalized Alkenes

“…In particular, the epoxidations mediated by homogeneous nontoxic metal-organic ligand complexes, such as salen Mn(III), with various oxidants have been appreciated as one of the most efficient processes [8][9][10][11][12]. Owing to the difficulties in separation and/or recovery of catalyst and removal of trace amounts of metal contaminants leached from the catalysts in the products, extended efforts have been focused on immobilization of such homogeneous epoxidation catalysts on various solid/liquid supports, including inorganic porous materials [13][14][15][16][17][18][19], organic polymers [20], and ionic liquids [21]. Unfortunately, the large number of immobilized catalysts usually displayed less efficiency in the catalysis in comparison with their homogeneous counterparts, probably due to the inaccessibility of the reagents to the reactive centers resulted from random distribution of the reactive centers onto supports [19,22].…”