Bis(2,6-dimethoxyphenyl)tellurium dihalides (Cl, Br or I) and dithiocyanate: crystal structure and temperature-dependent NMR spectra

Synthesis and structure of new aryltellurenyl halides derived from (dmpTe)2 (dmp = 2,6-dimethoxyphenyl)

“…With exception of the starting reagent 1, in all the title complexes the tellurium centers interact in a relatively strong manner with the oxygen atoms of the two methoxyphenyl groups. Wada et al [15,16] have discussed this kind of interactions, including the dependence of the rotational barrier of the Ar-group. In (RTe) 2 Fig.…”

Secondary bonding in functionalized organotellurium compounds: preparation and structural characterization of bis(acetamido)tellurium(IV) diiodide and bis(4-methylbenzoylmethyl)tellurium(II)

“…Calc. for C 17 H 10 N 2 O 4 : C,66.70;H,3.26;N,9.15%. IR(m/cm À1 ), 1732.1 (CO); 1 H NMR (d ppm), 7.88-7.70 (8H, m, 2Ar), 5.64 (2H, s, CH 2 ).…”

“…Among unsymmetrical diorganotellurium(IV) dichlorides with ArRTeCl 2 [7] or ArAr 0 TeCl 2 [8] stoichiometry (where R and Ar or Ar 0 are the sp 3 and sp 2 -hybridized carbon-linked organic groups respectively and only one is a small-bite O donor bidentate ligand) intramolecular 1,4-type TeÁ Á ÁO secondary interaction is preferred to intermolecular TeÁ Á ÁCl secondary interactions as the latter may or may not act as molecular associative force to result in a supramolecular structure. The recently determined solid state structures of symmetrical bis(2,6-dimethoxyphenyl)tellurium dihalides [9] are however, devoid of any intermolecular TeÁ Á ÁX secondary interaction presumably, due to the formation of intramolecular 4-membered rings by both the organic ligands making the Te atom coordinatively saturated.…”

α-Telluration of 2-acetylthiophene: Electronic influence of the heteroaromatic moiety on solid state structures

“…Among the molecular structures of unsymmetrical diorganotellurium(IV) dihalides 2a, 2b and 3a, the carbonyl O atom of the sole functionalized ligand is involved simultaneously in the intramolecular secondary bonding interaction to either of its heavier congeners. The observed internuclear distance between O and Te atoms, which is shorter than the sum of their van der [16]. The functionalized ligand thus prefers (C, O), rather than (C, S), mode of chelation, though the latter, involving its trans conformation, would have resulted in the formation of a less strained fivemember intramolecular ring.…”

“…Calc. for C 16 Compound 2: A solution of 2a (0.23 g, 0.50 mmol) in dichloromethane (20 mL) was shaken with an aqueous solution of Na 2 S 2 O 5 (0.09 g, 0.47 mmol) for 20 min. The yellow organic layer was separated, washed with water (4 Â 20 mL) and passed through anhydrous Na 2 SO 4 .…”