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

Abstract

Schiff base complex of copper-functionalized ) was synthesized and used as an efficient and novel heterogeneous catalyst for the oxidative coupling of thiols into corresponding disulfides and oxidation of sulfides to sulfoxides using hydrogen peroxide (H 2 O 2 ) as the oxidant. An aliphatic and aromatic series of sulfides and thiols including various functional groups were successfully converted into corresponding products. The all products were obtained in good to excellent yields. The mesoporous catalyst is characterized by FT-IR spectroscopy, BET, XRD, SEM, EDS and TGA. Recovery of the catalyst is easily achieved by simple filtration and reused for several consecutive runs without significant loss of its catalytic efficiency.

Nickel Schiff-base complexes immobilized on boehmite nanoparticles and their application in the oxidation of sulfides and oxidative coupling of thiols as novel and reusable nano organometal catalysts

“…16 Likewise, disulde bond formation is important in peptides, bioactive molecules as well as oil sweetening processes. 17,18 Disuldes are used in sulfonylation of enolates and other anions and also useful as vulcanizing agents. [17][18][19] For this reason, many methods including various catalysts and different oxidants have been developed over the years to perform these transformations.…”

“…17,18 Disuldes are used in sulfonylation of enolates and other anions and also useful as vulcanizing agents. [17][18][19] For this reason, many methods including various catalysts and different oxidants have been developed over the years to perform these transformations. [14][15][16][17][18][19] Concerning the green oxidant, hydrogen peroxide (with only H 2 O as a by-product) as an inexpensive and environmentally benign oxidant has been applied for these oxidations.…”

Anchoring of Cu(II)–vanillin Schiff base complex on MCM‐41: A highly efficient and recyclable catalyst for synthesis of sulfides and 5‐substituted 1H–tetrazoles and oxidation of sulfides to sulfoxides

“…Compared to the parent MCM‐41, it can be seen that the intensity of these characteristic peaks in the XRD pattern of the Cu(II)‐Vanillin‐MCM‐41 sample becomes weaker and shift to higher angles when metal is loaded on MCM‐41 (Cu(II)‐Vanillin‐MCM‐41). These observations indicate that functionalization occurs mainly inside the MCM‐41 channels …”

Synthesis and characterization of indium and thallium immobilized on isonicotinamide‐functionalized mesoporous MCM‐41: Two novel and highly active heterogeneous catalysts for selective oxidation of sulfides and thiols to their corresponding sulfoxides and disulfides

“…So, many procedures involving different catalysts and various oxidants have been presented to carry out these transformations. There is a continuing requirement for procedures that are easy, mild, effective and especially selective . Due to the environmentally friendly character of hydrogen peroxide (H 2 O 2 ), its effective oxygen content and low cost, oxidation using H 2 O 2 as an oxidant is preferred .…”

“…There is a continuing requirement for procedures that are easy, mild, effective and especially selective. [35][36][37] Due to the environmentally friendly character of hydrogen peroxide (H 2 O 2 ), its effective oxygen content and low cost, oxidation using H 2 O 2 as an oxidant is preferred. [38] The efficiency of more commonly used H 2 O 2 reactions in the presence of various catalysts is presented in Table 1. 2 | EXPERIMENTAL 2.1 | Characterization X-ray diffraction (XRD) patterns were acquired using an MPD diffractometer with Cu Kα radiation.…”