Recent advances on deoximation: From stoichiometric reaction to catalytic reaction

Organotellurium catalysis-enabled utilization of molecular oxygen as oxidant for oxidative deoximation reactions under solvent-free conditions

“…During our continuous investigations on green catalysis science and technologies [27][28][29][30], we recently focused on the oxidative deoximation reaction because of the great significances of this transformation in fine chemical production, as well as the total synthesis of natural products [31,32]. Thus, in this work, commercially available (PhTe) 2 was tested to catalyze the oxidative deoximation reaction, which, at present stage, usually requires chemical reagents generating a lot of solid waste [33], explosive oxidants [34,35], halogen-or nitro-contained solvents or additives [36], or precious metal catalysts [37].…”

Efficient and reusable ordered mesoporous WOx/SnO2 catalyst for oxidative desulfurization of dibenzothiophene

“…S3(B), † the activation energy of DBT is 54.8 kJ mol −1 . Zhu et al 18 have reported that the activation energy of DBT is 76.2 kJ mol −1 in the polyoxometalates/H 2 O 2 catalytic system. In AcOH/H 2 SO 4 /H 2 O 2 system the activation energy of DBT oxidation is 57 kJ mol −1 , reported by Ukkirapandian et al 63 The oxidation kinetics of BT and 4,6-DMDBT were also investigated under the optimal conditions.…”

“…During this process, organic suldes can be oxidized into highly polar sulfones and sulfoxides by catalysts with suitable oxidants, and removed by the subsequent extraction process using polar organic solvents. Various oxidants have been used for the oxidation of sulfur compounds, including molecular oxygen, [16][17][18] ozone, 19 organic peroxide, 20 and hydrogen peroxide (H 2 O 2 ). 21,22 Among them, H 2 O 2 has been extensively used, due to its high activity, high oxidative capacity, and production of only water aer the reaction.…”

Kilogram-Scale Production of Selenized Glucose

“…It is relatively eco-friendly, and the residue of this element in products is much more tolerable than that of transition metals according to the latest revision of the USP’s New Standard and Method for Elemental Impurities Control in 2017 . In our cases, organoselenium compounds are utilized as green catalysts instead of the traditionally employed transition-metal catalysts for fine chemical and medicinal intermediate production. , Selenium-containing materials are found to be even more practical catalysts owing to their high activities and recyclable features . Selenium-doped carbon (Se/C) as a heterogeneous catalyst has been successfully applied in the epoxidation of β -ionone and Beckmann rearrangement of ethyl 2-(2-aminothiazole-4-yl)-2-hydroxyiminoacetate to produce the related spice and pharmaceutical intermediates. , Very recently, it has even been found to be an efficient bactericide for Xanthomonas campestris pv.…”