ZnO–Fe3O4–Au Hybrid Composites for Thioanisole Oxidation Under Visible Light: Experimental and Theoretical Studies

Introducing Structural Diversity: Fe2(MoO4)3 Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

“…The oxidation of thioanisole can give rise to two distinct products: methylphenyl sulfoxide and methylphenyl sulfone, with the former being the intermediate reaction of sulfone (Figure 3A). According to Cervantes‐Macias et al., since the oxidation of sulfoxide to sulfone is a process that involves a high activation energy (E a =90 Kcal/mol), it becomes a challenge to obtain sulfones in a selective and efficient way [35] . Among the catalytic conditions to be optimized, catalyst composition, temperature, time, type of solvent and oxidant, amount of oxidant and catalyst loading were taken into account.…”

“…studied the selective aerobic oxidation of sulfides to sulfoxides in water under blue light irradiation over Bi 4 O 5 Br 2 and obtained high yields in a relatively short time [13] . The oxidation of thioanisole was also achieved under visible light by modified ZnO−Fe 3 O 4 −Au nanoparticles [14] . Despite these findings, there is still room for improvements since most of the existing procedures have drawbacks, e. g., high temperatures, extended reaction times, use of large amounts of promoters and organic solvents, and difficulties related to the catalyst separation and recycling.…”

“…[13] The oxidation of thioanisole was also achieved under visible light by modified ZnOÀ Fe 3 O 4 À Au nanoparticles. [14] Despite these findings, there is still room for improvements since most of the existing procedures have drawbacks, e. g., high temperatures, extended reaction times, use of large amounts of promoters and organic solvents, and difficulties related to the catalyst separation and recycling. Thus, the minimization of these impacts through the use of cleaner oxidants under mild conditions to achieve high selectivity and stability becomes an important point to be considered in the development of new technologies based on new and efficient catalysts.…”

Reductive Oligomerization of Nitroaniline Catalyzed by Fe3O4 Spheres Decorated with Group 11 Metal Nanoparticles

“…It has also been theorized that at the surface of the catalysts, the Fe 3 O 4 matrix can react with H + and H 3 O + to form Fe 3 O 3 -Au-H type intermediates . The recyclability studies of catalysts were not attempted; however, these materials have been steadily prepared in the laboratory and in our previous works, our group demonstrated the feasibility of the sample recuperation due to their magnetic properties …”

“… 50 The recyclability studies of catalysts were not attempted; however, these materials have been steadily prepared in the laboratory and in our previous works, our group demonstrated the feasibility of the sample recuperation due to their magnetic properties. 51 …”