Polymer-supported first-row transition metal schiff base complexes: Efficient catalysts for epoxidation of alkenes

Photocatalytic oxidative cleavage of aryl alkene CC bonds using a uranyl cation

“…, m -chloroperbenzoic acid ( m -CPBA) 4 and PhIO/HBF 4 , 5 have traditionally appeared to be required and have often been used for this transformation (Scheme 1a). Several protocols, such as transition metal catalysis (Fe, 6 Cu, 7 Ru, 8 Au, 9 Pt, 10 Pd, 11 etc .) using H 2 O 2 , TBHP, or oxygen as the oxidant, have been developed in order to carry out this transformation while meeting environmental protection requirements—but usually with apparently required harsh conditions such as high reaction temperature and with limited substrate scope.…”

Heterogeneous vanadium Schiff base complexes in catalytic oxidation reactions

“…There are different types of solid supports for heterogeneous catalysts, namely, zeolite, graphene oxide, 37 carbon, magnetic nanoparticles (MNPs) SBA-15, 38 MCM-41 (silica materials), multiwalled carbon nanotubes (MWCNTs), 39 clay, and polymer. 40 Also, the advantage of this heterogeneous catalyst in the field of catalysis is its easy separation, recyclable, thermally stable, highly selective and long catalytic lifetime. 41 Magnetic nanoparticle (MNPs) is also another type of solid support that is gaining more attention in the synthesis of heterogeneous catalyst because of their availability, low cost, easy functionalization, diversity, and a high surface area.…”

“…More so, the nanocatalyst is active, reusable (easy separation magnetically), environmentally friendly and stable. 42,43 The disadvantages and drawbacks of using a homogeneous catalysts are instability, deactivation, controlled desired product, expensive catalyst recycling, difficulty in recovery of the final product, and only use in the solution phase 40,44 . However, homogeneous complex is bound to a solid support to overcome these challenges.…”

Preparation and characterization of biomimetic heterogeneous catalysts with Cu(II) and Mn(III) complexes

“…Initially, the complexes were just ion-exchanged or adsorbed on the porous supports and, consequently, could be susceptible to leaching [6][7][8][9] . More recently, several grafting and tethering procedures have been developed to covalently attach transition-metal complexes to organic polymers [10][11][12] , silica 13 , zeolites 14 and other micro-and mesoporous inorganic materials [15][16][17][18][19] . As a result of the site isolation of transition metal complexes into the support, any bimolecular reaction leading to an oxidative destruction is prevented.…”