synthesis of unsymmetrical ferrocene aryl chalcogenides by C–H activation of ferroceneamide using 8-aminoquinoline as a directing group, aryl dichalcogenides, and copper(II) catalyst in the presence of silver acetate oxidant at 80 °C in DMSO. The developed methodology is quite general and mild to access three unsymmetrical diaryl chalcogenides (sulfide, selenide, and telluride) and also amenable to aryl
We report the Lewis acid catalysis of aryldiazoniumsalts, and their Lewis acidity applications in photogeneration of aryl radicals under additive-, photocatalyst- and transition metal-free conditions. In this visible light-mediated transformation, the Lewis acidic character of aryldiazoniumsalts enables access to the photoactive charge transfer complex with dichalcogenides. The usefulness and versatility
An Efficient One-Pot Synthesis of Symmetrical Diselenides or Ditellurides from Halides with CuO Nanopowder/Se<sup>0</sup> or Te<sup>0</sup>/Base
作者:Devender Singh、Anna M. Deobald、Leandro R. S. Camargo、Greice Tabarelli、Oscar E. D. Rodrigues、Antonio L. Braga
DOI:10.1021/ol100558b
日期:2010.8.6
A CuO nanopowder-catalyzed coupling reaction of aryl, alkyl, and heteroaryl iodides with elemental selenium and tellurium takes place in the presence of KOH at 90 degrees C In DMSO. A wide range of substituted symmetrical diselenides and ditellurides were afforded with good to excellent yields.
Microwave-assisted one-pot synthesis of symmetrical diselenides, ditellurides and disulfides from organoyl iodides and elemental chalcogen catalyzed by CuO nanoparticles
作者:Giancarlo V. Botteselle、Marcelo Godoi、Fabio Z. Galetto、Luana Bettanin、Devender Singh、Oscar E.D. Rodrigues、Antonio L. Braga
DOI:10.1016/j.molcata.2012.09.003
日期:2012.12
In this study CuO nanoparticles were applied as a catalyst for C-Se, C-Te, and C-S bond formation. The reaction was performed with organoyl iodides and elemental selenium, tellurium or sulfur under microwave irradiation in the presence of a base and solvent at 80 degrees C. This novel protocol allowed the synthesis of a variety of diselenides, ditellurides and disulfides in good to excellent yields in a very short reaction time. (C) 2012 Elsevier B.V. All rights reserved.
Synthesis of stable α-fluoromethyl putative carbanions via a chemoselective reduction-monofluoromethylation sequence of diselenides under sustainable conditions
作者:Raffaele Senatore、Monika Malik、Ernst Urban、Wolfgang Holzer、Vittorio Pace
DOI:10.1016/j.tet.2021.131921
日期:2021.4
α-Fluoromethyl selenoethers were prepared through a sequential one-pot diselenide reduction-fluoromethylation with the fluorinated, highly manipulable C1 source ICH2F. The reaction benefited from the employment of the environmentally friendly solvent MeTHF (2-methyltetrahydrofuran) which enabled to maximize the efficiency of both steps of the technique. A series of variously functionalized analogues