Regio- and stereo-specific addition of organotellurium trihalides to ferrocenylacetylene: Molecular and crystal structure of (Z)-halovinyl organotellurium dihalides

Metal-metal bond cleavage in [Cp(CO)2Fe-Fe(CO)2Cp] under the action of organotellurium(IV)tribromides

“…Although the elongation of short Te-O contacts normally occurs on the substitution of one of halide atoms in II by the less electronegative organic frag ments Fc, where Fc is ferrocenyl (2.6636(6) [9], Scheme 4), the particularly notable elongation in case of III could be partly attributed to the role of back π donation from iron to tellurium as well. ( Table 2).…”

Chimeric supramolecular synthons in Ph2Te2(I2)Se

“…In the course of our ongoing study of the applications of diorganotellurides in molecular and crystal design (Torubaev et al, 2008(Torubaev et al, , 2010(Torubaev et al, , 2011(Torubaev et al, , 2014(Torubaev et al, , 2017(Torubaev et al, , 2018(Torubaev et al, , 2019a, we have investigated the direct oxidation (i.e. halogenation) of the diaryl-hetero-trichalcogenide PhTeSeTePh and report here the detailed analysis of the supramolecular assembly of its iodinated product, PhTeSeTeI 2 Ph, 1, in the solid state.…”

“…the centrosymetric dimers [PhTeI 2 ] 2 stabilized by TeÁ Á ÁI ChBs, which usually propagate into polymeric chains in diorganotelluro-diiodide crystals of RTeI 2 R 0(Torubaev et al, 2010(Torubaev et al, , 2014(Torubaev et al, , 2017 Fig. 4), (ii) the simple translation chains aggregated by [TeÁ Á Á(Ph)] ChB SS(Zukerman-Schpector & Haiduc, 2002), which were recently described for Ph 2 Te 2 in terms of LSAMs(Torubaev et al, 2019b), and (iii) the centrosymetric[SeTePh] 2 SSs stabilized by double TeÁ Á ÁSe ChBs, similar to those in the discrete…”

Stereospecific chlorotelluration of terminal acetylenes

“…The vinyltellurium(II) compounds have been recognized as important organotellurium precursors in transmetallation and palladium-catalyzed coupling reactions [3]. These facts stimulated studies on the electrophilic addition of tellurium(IV) halides to a C^C bond and during the last two decades, the reactions of substituted 1-alkynes have been extended to tellurium tetrabromide [4], organotellurium trichlorides [5], -tribromides [6,7] and even to the poorly electrophilic aryltellurium triiodides [8,9]. The reduction of aryl(2-halovinyl)tellurium(IV) dihalides, the addition product of aryltellurium trichloride and 1-alkynes, gives aryl vinyl tellurides and thus provides an alternative route to their synthesis.…”

“…Thus, the reaction of aryltellurium tribromides with alkynes in methanol afforded (E)-(2-bromovinyl)aryltellurium(IV) dibromides, but in benzene yielded the (Z)-isomer [6]. However, in the case of the addition of RTeX 3 (X ¼ Br, I) to ferrocenylacetylene, while the electron-donor ability of the ferrocenyl moiety facilitated the reaction, its bulkiness presumably undermined the influence of solvent polarity as the (Z)-isomers were invariably obtained [9]. The regio-and stereochemistry of the addition reactions of TeCl 4 or oganotellurium trichlorides to 3-hydroxyalkynes is however, reported to be influenced by the electronic factor of the hydroxyl group and the steric congestion at the propargylic position.…”