Diorganyl Derivatives of Tellurium(IV) (σ-Telluranes of R₂TeX₂Type)

Abstract

Literature data concerning the synthesis and reactions of diorganyl derivatives of tellurium(1V) (a-telluranes of R2TeX2 type) are systematized and generalized in this review.

Synthesis and structure of N-arylimines of β-tellurocyclohexenals with the intramolecular coordination N→Te bonds

“….O bonds involving the perchlorate anion are very weak (3.33-3.56 Å ), the type of coordination at the tellurium atom is determined by solely intramolecular N ! Te bond (2.750 Å , v = 0.58) and the tellurium atom in the solid acquires trigonal bipyramidal configuration typical of r-telluranes R 2 TeX 2 [35] and RTeX 3 [36]. The crystal packing of 12 is different (Fig.…”

anti-Markovnikov addition of tellurium tetrachloride to trimethyl ethynyl silane

“…Formation of the compound 5 is well explained by the common trend of diaryltellurium dichlorides and dibromides Ar 1 Ar 2 TeX 2 to yield bis(diaryldihalogenotellurium)oxides (Ar 1 Ar 2 TeX) 2 O (X = Cl, Br) as a result of hydrolysis [9].…”

α-Telluration of 2,4,6-trimethylacetophenone under mild conditions: Role of steric factor in the solid state structures of Te(II and IV) compounds

“…Biphasic bisulfite reduction of these diorganotellurium(IV) dihalides results in the labile Te(II) derivatives, (RCOCH 2 ) 2 Te and (RCOCH 2 ) ArTe (Ar ¼ 1-Np, Mes; R ¼ Ph, Me, Et, i-Pr, t-Bu). Oxidative addition of dihalogens to these tellurides gives their dihaloTe(IV) derivatives as crystalline solids which have been characterized by spectral and diffraction studies [4]. Solid state structural characterization of telluroethers is reported either for diaryls with C sp2 eTeeC sp2 or alkylaryls with C sp2 eTeeC sp3 groupings.…”

“…The oxidative insertion of elemental Te into the C sp3 eBr bond of a-bromo-substituted acylmethanes recently achieved by us provides a one-pot synthesis of keto-functionalized dialkyltellurium dibromides [3]. Another route to tellurated ketones involves electrophilic substitution of methyl ketones with ArTeCl 3 /TeCl 4 to afford diorganotellurium dichlorides [4]. Biphasic bisulfite reduction of these diorganotellurium(IV) dihalides results in the labile Te(II) derivatives, (RCOCH 2 ) 2 Te and (RCOCH 2 ) ArTe (Ar ¼ 1-Np, Mes; R ¼ Ph, Me, Et, i-Pr, t-Bu).…”