Selective hydrogen peroxide oxidation of sulfides to sulfones with carboxylated multi-walled carbon nano tubes (MWCNTs-COOH) as heterogeneous and recyclable nanocatalysts under organic solvent-free conditions

Abstract

This study deals with oxidation of sulfides to sulfones by using a heterogeneous and recyclable nanocatalyst.

Photosensitizer effects of MWCNTs-COOH particles on CT26 fibroblastic cells exposed to laser irradiation

“…As seen from the Figure 2(b) (SEM picture at 10 lm dimension), surface morphology of MWCNTs-COOH revealed that these particles were distributed very homogeneously on the distilled water which its reason can be due to cross-link roles of carboxylic acid groups between adjacent MWCNTs [28,29]. Aggregation of MWCNTs particles at the distilled water is an important limitation in the using of them [30,31].…”

Reusable BNPs‐SiO2@(CH2)3NHSO3H‐catalysed selective oxidation of sulfides to sulfones

“…[18,19,[37][38][39][40][41][42][43][44][45] All reactions were monitored by TLC. [18,19,[37][38][39][40][41][42][43][44][45] All reactions were monitored by TLC.…”

“…All products were characterized by comparison of their spectral data and physical properties with those of authentic samples. [18,19,[37][38][39][40][41][42][43][44][45] All reactions were monitored by TLC. Melting points were determined using a Stuart Scientific SMP2 apparatus.…”

Fe3O4@S‐ABENZ@VO: Magnetically separable nanocatalyst for the efficient, selective and mild oxidation of sulfides and oxidative coupling of thiols

“…Also, the oxidative coupling of thiols to the corresponding disulfides is an important reaction in chemical and biological processes . In view of the importance of sulfoxides and disulfides, various reagents, catalysts and oxidative procedures are now available for these transformations, such as peracids, dioxiranes, NaIO 4 , CrO 3 , SeO 2 , PhIO, DABCO tribromide, Ti‐complex/MCM‐41, VO 2 F(dmpz) 2 , zirconium tetrachloride, Cu(II) Schiff base complex on mesoporous MCM‐41, silica sulfuric acid/NaNO 2 , [Fe(nta)Cl 2 ] 2− , etc. However, most of these methods are not satisfactory because of one or more of the following drawbacks: formation of environmentally unfriendly by‐products, over‐oxidation to sulfones, low product yields, tedious work‐up, toxicity and reagent expense.…”