The first report on the catalytic oxidation of urazoles to their corresponding triazolinediones via in situ catalytic generation of Br+ using periodic acid or oxone®/KBr system

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 + ).…”

A Novel Catalytic Method for the Oxidation of Sulfides to Sulfoxides with Silica Sulfuric Acid and Sodium Nitrite in the Presence of KBr and/or NaBr as Catalyst

“…[36][37][38][39][40][41] Therefore we wish to explore different approaches for the generation of Br ＋ . However a mixture of silica sulfuric acid, NaNO 2 and a catalytic amount of Br -in the presence of wet SiO 2 (50%, w/w) was carried out for the in situ generation of Br ＋ .…”

Ruthenium complexes of 4,4′-bi-1,2,3-thiadiazole and azoimine ligands: syntheses, crystallography, and electrochemical studies

“…Tetrabutylammonium hexafluorophosphate (TBAH), purchased from Aldrich, was recrystallized twice from 1:1 ethanol/water solution and then vacuum-dried at 110°C. Ethyl carbazate was prepared by a procedure [11]. 4,4 0 -bi-1,2,3-Thiadiazole (btd) was prepared by following a procedure [6] with a small modification, using a light-protected system, since the btd ligand is not stable in the presence of light, and using ethanol as a polar protic solvent with a weak acetic acid as a catalyst as described briefly below.…”