Sodium sulfate–hydrogen peroxide–sodium chloride adduct: selective protocol for the oxidative bromination, iodination and temperature dependent oxidation of sulfides to sulfoxides and sulfones
作者:Eknath M. Gayakwad、Khushbu P. Patel、Ganapati S. Shankarling
DOI:10.1039/c8nj06038j
日期:——
chemoselectivity for monobromination. Selective oxidation of sulfides to sulfoxides and sulfones has also been studied and good to excellent yields of the desired products were obtained. Acetic acid was found to be the solvent of choice for these reactions. This simple method represents an ecologically benign and alternative pathway for the oxidative halogenation of anilines and the oxidation of sulfides to
Gold(III) halides catalyze the oxidation of sulfides to sulfoxides in a phase-transferprocess. The organic sulfides, dissolved in nitromethane, are treated with (Bu4N+AuCl4−) in catalytic amount and aqueous nitric acid which acts as oxidant. The oxidation of the thio-group is selective and can be carried out also in the presence of other oxidizable groups, such as vinyl, tertiary amino, hydroxy, diol
Versatile catalysis of “natural extract”: oxidation of sulfides and alcohols and ipso-hydroxylation of arylboronic acids
作者:Apurba Dutta、Abdul Aziz Ali、Diganta Sarma
DOI:10.1007/s13738-019-01707-1
日期:2019.11
In the present work, we have described the versatile applications of naturally available inexpensive citrous lemon juice as biocatalyst for controlled oxidation of sulfides and alcohols and ipso-hydroxylation of arylboronic acids using 30% H2O2 as a green oxidant. A series of structurally divergent sulfides and benzyl alcohols were oxidized to their corresponding sulfoxides and aldehydes, respectively, with good-to-excellent yields. Similarly, aryl and heteroaryl boronic acids were rapidly, often within minutes, transformed to their corresponding phenols at room temperature.
Chemoselective sulfoxidation by H2O2 or HNO3 using a phosphate impregnated titania catalyst
作者:Saitanya K. Bharadwaj、Susanda N. Sharma、Sahid Hussain、Mihir K. Chaudhuri
DOI:10.1016/j.tetlet.2009.03.106
日期:2009.7
compounds have been selectively oxidized to the corresponding sulfoxides by either H2O2 or HNO3 using a newly developed solid acidcatalyst composed of 84.5% of TiO2 and 15.5% of [Ti4H11(PO4)9]·nH2O (n = 1–4). The chemoselective oxidation of sulfides in the presence of vulnerable groups such as –CN, –CC–, –CHO, or –OH, as well as sulfoxidation of substrates like benzothiazole, glycosyl sulfide, and dibenzothiophenes
使用由84.5%的TiO 2和15.5%的[Ti 4 H 11(PO 4)9组成的新开发的固体酸催化剂,已通过H 2 O 2或HNO 3将多种有机硫化合物选择性地氧化为相应的亚砜。]· n H 2 O(n = 1-4)。在易碎基团(例如-CN,-C)存在下,硫化物的化学选择性氧化C –,– CHO或–OH以及底物(如苯并噻唑,糖基硫醚和二苯并噻吩)的亚硫酸化是该协议的一些重要属性。在目前的实验条件下,硝酸比过氧化氢具有相对更好的选择性。
Borax-Catalyzed and pH-Controlled Selective Oxidation of Organic Sulfides by H<sub>2</sub>O<sub>2</sub>: An Environmentally Clean Protocol
作者:Sahid Hussain、Saitanya K. Bharadwaj、Ravindra Pandey、Mihir K. Chaudhuri