Bidentate salen Cu(II) complex functionalized on mesoporous MCM-41 as novel nano catalyst for the oxidative coupling of thiols into disulfides using urea hydrogen peroxide (UHP)

Schiff base complex of Cu immobilized on MCM-41 as reusable catalyst for efficient oxidative coupling of thiols and oxidation of sulfides using hydrogen peroxide

“…Initially, the MCM-41 mesoporous has been prepared using cetyltrimethylammoniumbromide (CTAB) as structure-directing agent and tetraethylorthosilicate (TEOS) as a source of silicon in NaOH solution according to the methods reported recently [5,11], and subsequently were functionalized with 3-aminopropyltriethoxysilane (APTES). The immobilized salen on MCM-41 was performed via condensation of isatin and supported-aminopropyl groups.…”

“…Among the various nano materials, Inorganic nanoporous materials have recently been used in various fields, such as catalysis [5], adsorption [6], extraction [7], energy [8], drug delivery systems [9], and for their luminescent character [10], and especially in the isolation and recycling of expensive homogeneous catalysts [5]. Among them, mesoporous MCM-41 have been widely used as catalysts in many organic reactions because of some unique properties like as large specific surface area ([1000 m 2 /g), homogeneous hexagonal pore arrays with pore diameters between 1.5 and 10 nm, relatively hydrophobic nature, ease of functionalization, high thermal stability (900°C) and facile separation [11,12]. Its high thermal stability allows perform of organic reaction in high temperatures and also its very large pore size allows passage of large molecules such as organic ligands and metal complexes through the pores to reach to the surface of the channel [13].…”

“…Its high thermal stability allows perform of organic reaction in high temperatures and also its very large pore size allows passage of large molecules such as organic ligands and metal complexes through the pores to reach to the surface of the channel [13]. Furthermore, Existence of many silanol groups on the mesoporous MCM-41 surface leads to coupling with alkoxysilane compounds which support terminal functional groups available for immobilization of other substances [11]. These properties of MCM-41 has attracted considerable attention for its potential application as catalyst [5,11].…”

“…Furthermore, Existence of many silanol groups on the mesoporous MCM-41 surface leads to coupling with alkoxysilane compounds which support terminal functional groups available for immobilization of other substances [11]. These properties of MCM-41 has attracted considerable attention for its potential application as catalyst [5,11].…”

Preparation and Characterization of Organically Modified MCM-48 as Heterogonous Catalyst for Oxidation of Sulfides and Thiols

“…Furthermore, disulfides are relatively more stable to organic reactions such as oxidation, alkylation and acylation compared to the corresponding free thiols, also the thiol group can conveniently be protected as a disulfide [37]. For the conversion of thiols to disulfides many methods have been developed over the years to find efficient these organic transformations [38][39][40][41][42][43][44].…”