Borax‐Catalyzed and pH‐Controlled Selective Oxidation of Organic Sulfides by H₂O₂: An Environmentally Clean Protocol

Abstract

The selective oxidation of sulfides to sulfoxides and sulfones was achieved in high yields at room temperature with borax as a recyclable catalyst and H 2 O 2 as the terminal oxidant by varying the pH of the reaction medium. The borax/H 2 O 2 system can chemoselectively oxidize alkyl and aryl sulfides in

The Diversity of Anti-Microbial Secondary Metabolites Produced by Fungal Endophytes: An Interdisciplinary Perspective

“…(Valsaceae), isolated from the leaves of Laurus azorica (Lauraceae), a laurel tree from the Canary Island of Gomera. Cycloepoxylactone has been shown on agar plates to inhibit the growth of an anther smut fungus ( Microbotryum violaceum ) and a soil inoculant bacterium ( Bacillus megaterium ), while cycloepoxytriol B also inhibited growth of an alga ( Chlorella fusca ) (Hussain et al, 2009). …”

7.28 Oxidation of Sulfur, Selenium, and Tellurium

“…136 The effective oxidants are peroxoborate species and the major advantages of this system are the recyclability of the catalyst and the relatively large volume of sulfide (5 g) that can be converted. Inorganic peroxides, such as sodium percarbonate and sodium perborate under solvent-free conditions or in water, respectively, work well as convenient oxidants of sulfides to sulfoxide or to sulfone.…”

Selective oxidation of bulky organic sulphides over layered titanosilicate catalysts

“…peroxides, NaOCl, H 5 IO 6 , KMnO 4 5 , peroxynitrous acid 6 ) and homogenous catalysts (e.g. complexes of titanium 7 , vanadium 8 , tungsten 9 and zinc 10 , borax 11 ), which are able to selectively oxidize sulphides to sulphoxides and sulphones, from the engineering point of view it is always convenient to work with a heterogeneous catalyst. Considering heterogeneous oxidation catalysts, titanium based catalysts are one of the first choices.…”