Heterogenization of functionalized Cu(II) and VO(IV) Schiff base complexes by direct immobilization onto amino-modified SBA-15: Styrene oxidation catalysts with enhanced reactivity

Cobalt(II) and Manganese(II) Complexes of Novel Schiff Bases, Synthesis, Charcterization, and Thermal, Antimicrobial, Electronic, and Catalytic Features

“…Higher selectivities (14.2% and 18.7%) were obtained for cyclohexeneoxide by using cobalt(II) complexes as catalyst. Comparing our results to those reported previously, we can say that our compounds and their catalytic activity results, although not whole, have similarities with salen and salophane type Schiff bases reported previously [8,12,18,51]. The oxidation schemes for both styrene and cyclohexene can be seen in Figure 7.…”

“…In particular, the catalysis of alkene oxidation by soluble transition metal complexes is of great interest in both biomimetic chemistry and synthetic chemistry [6]. So far various Schiff base complexes have been employed to catalytic oxidation of olefins to epoxides and aldehydes, and it has been proved that many Schiff base complexes gave improved results as catalysts for these kinds of oxidation reactions [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In our research, the synthesized Schiff base complexes have been searched for their potential use as catalysts in oxidation reactions for both cyclohexene and styrene.…”

Tethering of Cu(II), Co(II) and Fe(III) tetrahydro-salen and salen complexes onto amino-functionalized SBA-15: Effects of salen ligand hydrogenation on catalytic performances for aerobic epoxidation of styrene

“…Both strategies have considerable advantages from the point view of economy of synthetic steps and the purity of the metal salen complex present on the solid. However, according to the literature [21] and our previous work [22], aminopropyl groups on SBA-15 are susceptible to bind to metal ions rather than react with chloromethyl groups of salen complexes. The former binding mode results in relatively weak coordination bond not robust enough to prevent salen complexes from leaching to the solution during the reaction process.…”

Immobilized vanadium amino acid Schiff base complex on Al-MCM-41 as catalyst for the epoxidation of allyl alcohols

“…This attention is still growing; a considerable research effort is devoted to the synthesis of modified and supported reagents for catalysis and materials chemistry [14][15][16]. The Schiff bases of vanadium complexes are efficient catalysts for oxidation reactions both in homogeneous [17][18][19][20][21][22][23][24][25][26] and heterogeneous [27][28][29][30] systems. The activity of these complexes varies with the type of ligands, coordination sites and type of support in the heterogeneous catalysts.…”