Les vitesses et equilibres sont rapportes pour une serie de reaction d'arylmethylseeniures avec l'ion p-氯苯基二甲基硒。Les vitesses de reaction Experimentales entre les agent demethylation «durs» et les nucleophiles «mous» presentent des petites biass par rapport aux valeurs calculees, principalement mais pas toujours dans le sens prevu par le principe HSAB
Les vitesses et equilibres sont rapportes pour une serie de reaction d'arylmethylseeniures avec l'ion p-氯苯基二甲基硒。Les vitesses de reaction Experimentales entre les agent demethylation «durs» et les nucleophiles «mous» presentent des petites biass par rapport aux valeurs calculees, principalement mais pas toujours dans le sens prevu par le principe HSAB
Electrooxidative B−H Functionalization of
<i>nido</i>
‐Carboranes
作者:Meng Chen、Deshi Zhao、Jingkai Xu、Chunxiao Li、Changsheng Lu、Hong Yan
DOI:10.1002/anie.202015299
日期:2021.3.29
of nido‐carboranes (7,8‐nido‐C2B9H12−) has been developed under electrochemical reaction conditions. In this reaction system, anodic oxidation serves as a green alternative for traditional chemical oxidants in the oxidation of nido‐carboranes. No transition‐metal catalyst is required and different heteroatoms bearing a lone pair are reactive in this transformation. Coupling nido‐carboranes with thioethers
A general procedure for the synthesis of methylthio-, methylseleno- and methyltelluro-substituted aromatic compounds
作者:Lars Engman、Jonas S.E. Hellberg
DOI:10.1016/0022-328x(85)80366-1
日期:1985.12
A one-pot procedure is described which allows the facile introduction of one or two methylchalcogeno groups into a variety of monobromo or dibromo aromatics. The bromo compounds were converted to their corresponding lithio derivatives by treatment with t-butyllithium in tetrahydrofuran at −78°C, and these derivatives were then treated, at ambient temperature with elemental sulfur, selenium, or tellurium
Metal‐Free Synthesis of Selenodihydronaphthalenes by Selenoxide‐Mediated Electrophilic Cyclization of Alkynes
作者:Shaoyu An、Zhong Zhang、Pingfan Li
DOI:10.1002/ejoc.202100423
日期:2021.6.7
A metal-free, one-pot selenium mediated electrophiliccyclization reaction of alkynes and triflic anhydride-activated selenoxides was realized, giving selenium containing dihydronaphthalene products, including selenium-substituted phenanthrene, dihydroquinoline, 2H-chromene, and coumarin.
A general and green procedure for the synthesis of organochalcogenides by CuFe<sub>2</sub>O<sub>4</sub>nanoparticle catalysed coupling of organoboronic acids and dichalcogenides in PEG-400
作者:Debasish Kundu、Nirmalya Mukherjee、Brindaban C. Ranu
DOI:10.1039/c2ra22415a
日期:——
A general and efficient procedure has been developed for the synthesis of organochalcogenides (selenides and tellurides) by a simple reaction of organoboronic acids and dichalcogenides catalysed by CuFe2O4 nanoparticles in PEG-400 without any ligand. This protocol offers the scope for access to a wide spectrum of chalcogenides including diaryl, aryl–heteroaryl, aryl–styrenyl, aryl–alkenyl, aryl–allyl, aryl–alkyl and aryl–alkynyl versions. The catalyst is magnetically separable and recyclable eight times without any loss of appreciable catalytic activity. The products are obtained in high purities after evaporation of solvent followed by filtration column chromatography.
Copper-catalyzed chalcogenation of aryl iodides via reduction of chalcogen elements by aluminum or magnesium
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2012.09.019
日期:2012.12
Aluminum-induced copper-catalyzed coupling of aryl iodides with selenium or sulfur element could afford the corresponding diaryl selenides or sulfides in good yields. When magnesium chloride as an additive was employed, diaryl monoselenides and monosulfides were selectively obtained. On the contrary, the use of sodium carbonate produced diaryl diselenides and disulfides. The preparation of diaryl diselenides