Selective and efficient oxidation of sulfides to sulfoxides using ammonium cerium (IV) nitrate in the presence of a catalytic amount of KBr or NaBr

Synthesis and Characterization of Sulfamic Acid-Functionalized Nanoparticles and Study of Its Catalytic Activity for the Oxidation of Sulfides to Sulfoxides

“…After full characterization of synthesized catalyst and in continuation of our studies on environmentally benign chemical processes, [24][25][26][27] in the present work we disclose that Fe3O4-SA-PPCA can be used as a new heterogeneous catalyst for the selective oxidation of structurally diverse sulfides to sulfoxides using 33 % H2O2 in ethanol as solvent at 60 °C (Scheme 2).…”

Metal-free catalytic oxidation of sulfides to sulfoxides with ammonium nitrate, ammonium hydrogen sulfate and ammonium bromide as catalyst

“…[31][32][33][34][35][36] 40 However, the low oxidizing power of ammonium nitrate is the main drawback to its application. Therefore we decide to activate this reagent with supported ammonium hydrogen sulfate on silica gel (NH 4 HSO 4 -SiO 2 ).…”

“…[31][32][33][34][35][36] In the first place, NH 4 NO 3 reacts with NH 4 HSO 4 to produce in situ HNO 3 . Subsequently, auto ionization of HNO 3 generates nitronium ion (NO 2 + ), which is able to convert bromide ion (Br -) to bromonium (Br + ).…”

Green and Metal-free Catalytic Oxidation of Urazoles into Triazolinediones by Guanidinium Nitrate and Catalytic Amounts of Silica Sulfuric Acid

“…In continuation of our studies on the application of new reagents in organic functional group transformations [14][15][16][17][18][19][20][21][22][23] we became interested to introduce a metal-free catalytic media for the conversion of 4-substituted urazoles into triazolinediones by mixing of guanidinium nitrate and catalytic amounts of silica sulfuric acid.…”