Gold(III) catalyzed oxidation of sulfides to sulfoxides with hydrogen peroxide

Efficient and Highly Selective Aqueous Oxidation of Sulfides to Sulfoxides at Room Temperature Catalysed by Supported Iron Oxide Nanoparticles on SBA‐15

“…[22,25,26] Furthermore, heterogeneous systems reported for this process either involve complex systems [27,28] or are unable to efficiently work under aqueous conditions. [17,23,[29][30][31] The development of a simple and efficient heterogeneous catalytic methodology that can efficiently promote a mild aqueous oxidation of sulfides to sulfoxides (either at room temperature or under microwave irradiation with short reaction times and low temperatures) with a green oxidant (e.g., hydrogen peroxide or molecular oxygen) without any contamination by sulfones will be a major achievement in oxidation chemistry. Another important point to be considered is the use of transition metals and particularly the widely available, cheap and non-toxic iron-based heterogeneous catalysts, which have not been reported to date in the oxidation of sulfides.…”

Catalytic oxidation of sulfides to sulfoxides using aluminium hydrogen sulfate, sodium nitrite and catalytic amounts of metal bromide

“…Nowadays, most research is focused on the more versatile, more selective and more reactive catalysts [2]. The development of efficient and new catalytic systems for various organic transformations is an active ongoing research area and the scope for further improvement towards milder reaction conditions [3].…”

Facile and efficient one-pot synthesis of 2-arylbenzoxazoles using hydrogen tetrachloroaurate as catalyst under oxygen atmosphere

“…In contrast, gold-catalyzed oxidation chemistry, in particular gold as a catalyst for selective oxidation reactions with economic and environmentally benign oxidants, such as dioxygen or hydrogen peroxide, has been less developed (de Vos and Sels, 2005). So far, representative oxidation transformations are mainly limited in oxidation of monoxide (Haruta et al, 1987;Valden et al, 1998;Mallat and Baiker, 2004), alcohols (Arcadi and Giuseppe, 2004;Guan et al, 2005;Tsunoyama et al, 2005;Choudhary et al, 2007;Li et al, 2007;Miyamura et al, 2007;Kanaoka et al, 2007), amines (Lazar and Angelici, 2006), and sulfides (Boring et al, 2001;Yuan and Bian, 2007), epoxidations of olefins (Min and Friend, 2007), oxidative cleavage of carbon-carbon multiple bonds (Liu et al, 2006;Xing et al, 2006), oxidation of alkanes (Shul′pin et al, 2001), etc. In addition, the field of gold-catalyzed oxidation chemistry is mostly dominated by heterogeneous catalysts, while homogeneous catalysts still represent the much smaller part.…”