Mild Reduction of Tellurium(IV) and Selenium(IV) Compounds by Sodium Ascorbate
作者:Lars Engman、Joachim Persson
DOI:10.1080/00397919308009800
日期:1993.2
Abstract Sodium ascorbate was found to mildly reduce organyltellurium trihalides to diorganyl ditellurides, organylselenium trihalides to diorganyl diselenides, diorganyltellurium dihalides and oxides to diorganyl tellurides and diorganylselenium dihalides and oxides to diorganyl selenides.
4-MeOC6H4, 4-BuOC6H4, 4-PhOC6H4, 2-naphthyl; X = Cl, Br) with a palladium(II) salt in acetonitrile at 25°C affords, in good yields (29–78%), the corresponding biaryls (ArAr) either in the atmosphere or under 1 atm CO. The presence of CO accelerates this aromatic coupling significantly to produce some active palladium carbonyl species, the formation of which was confirmed by IR spectroscopy of Li2PdCl4 in
aryltellurium三卤化物(抽纱的治疗3:Ar为PH,4- BRC 6 ħ 4,4-MEC 6 ħ 4,4-MeOC 6 H ^ 4,4-BuOC 6 ħ 4,4-PhOC 6 ħ 4,2-萘基; X = Cl,Br)和钯(II)盐在25°C的乙腈溶液中,可在大气中或低于1个大气压的条件下,以良好的收率(29-78%)提供相应的联芳基(ArAr)。的CO大大加速了这种芳族偶联,从而产生了一些活性的羰基钯物种,其形成已通过Li 2 PdCl 4的红外光谱证实在乙腈溶液中于一氧化碳; (Pd = C = O)物种的ν(C = O)分别在2140和1908 cm -1处显示出强烈的尖锐吸收和较弱的尖锐吸收。反应后用碱处理对于产生联芳基是必不可少的。
Organic tellurium compounds—III
作者:M. de Moura Campos、N. Petragnani
DOI:10.1016/s0040-4020(01)92701-2
日期:1962.1
The reaction of tellurium tetrachloride and aryltellurium trichloride with simple olefins and γ, σ-unsaturated acids has been studied. Cyclohexene gives normal products of addition while styrene, di-isobutylene and 1,4-diphenylbutadiene-1,3 do not react with aryltellurium trichlorides and give rise to elementary tellurium when treated with tellurium tetrachloride.