Aqueous sodium hypochlorite mediated chemoselective oxidation of chalcogenides to monoxides and dioxides by microwave exposure
作者:Jitender M. Khurana、Bhaskara Nand
DOI:10.1139/v10-060
日期:2010.9
A solvent-free, rapid, and highly selective oxidation of sulfides, selenides, and tellurides (chalcogenides) to the corresponding monoxides (sulfoxides, selenoxides, and telluroxides) or the corresponding dioxides (sulfones, selenones, and tellurones) has been developed using aqueous sodium hypochlorite on solid supports by exposure to microwave. Chemoselectivity and quantitative yields have been attained
Facile Deoxygenation of Telluroxides, Tellurones and Selenones with Nickel Boride at Ambient Temperature
作者:Jitender M. Khurana、Anshika Lumb
DOI:10.1080/00304948.2012.643702
日期:2012.1
Nickel boride has been reported as a convenient and efficient reagent in numerous transformations.1–5 It is superior to many other metal catalysts due to its low cost, ease of preparation and handling, non-pyrophoric nature and easy removal. Unlike its initial applications as a heterogeneous catalyst, nickel boride is used as a reducing agent without aid of hydrogen as it contains adsorbed hydrogen
Rapid Oxidation of Selenides, Selenoxides, Tellurides, and Telluroxides with Aqueous Sodium Hypochlorite
作者:Jitender M. Khurana、Bhaskar M. Kandpal、Yogendra K. Chauhan
DOI:10.1080/10426500307909
日期:2003.6
A simple and convenient procedure for the rapid oxidation of a variety of selenides, selenoxides, tellurides, and telluroxides with aqueoussodiumhypochlorite to selenones and tellurones, respectively, has been reported in dimethylformamide at ambient temperature.
Aryl selenides and selenoxides trap efficiently the intermediates in the reaction of singlet oxygen with sulfides. In the co-photooxygenation of 1 equiv of an aryl selenoxide with 1.3 equiv of dimethyl sulfide, the aryl selenone is formed quantitatively. Aryl selenides require 4–5 equiv of sulfide for their complete co-oxidation to selenones.
Exploring the reactivity of <sub>L</sub>-tellurocystine, Te-protected tellurocysteine conjugates and diorganodiselenides towards hydrogen peroxide: synthesis and molecular structure analysis
作者:Abhishek Tripathi、Rajesh Deka、Ray J. Butcher、David R. Turner、Glen B. Deacon、Harkesh B. Singh
DOI:10.1039/d2nj00997h
日期:——
[Te2CH2CH(NH3+)COO−}2] (4) with H2O2 in the presence of HBr resulted in the formation of cyclic, zwitterionic organotellurolate(IV) species, namely [Te−CH2CH(NH3+)COO}(Br)3] (5). The H2O2 oxidation of Te-protected tellurocysteine derivatives [RTeCH2CH(NH2)COOH}] [R = C6H5 (6) and 4-MeC6H4 (7)] in the presence of HCl resulted in the formation of chlorotellurane species [(C6H5)TeCH2CH(NH3+)COOH}(Cl)2]Cl
L-碲半胱氨酸 [Te 2 CH 2 CH(NH 3 + )COO - } 2 ] ( 4 ) 与 H 2 O 2在 HBr 存在下的氧化反应导致形成环状的两性离子有机碲酸盐( IV )种,即[Te - CH 2 CH(NH 3 + )COO}(Br) 3 ] ( 5 )。Te-保护的碲半胱氨酸衍生物 [RTeCH 2 CH(NH 2 )COOH}] [R = C]的 H 2 O 2氧化6 H 5 ( 6 ) 和 4-MeC 6 H 4 ( 7 )] 在 HCl 存在下形成氯碲烷物质 [(C 6 H 5 )TeCH 2 CH(NH 3 + )COOH}(Cl ) 2 ]Cl ( 8 ) 和 [(4-MeC 6 H 5 )TeCH 2 CH(NH 3 + )COO}(Cl)]Cl ( 9 )。二有机二硒化物的氧化反应 R 2 Se 2 [R = 4-MeC 6 H 4 ( 10),