With Cleavage of Te —C Bonds

4-dimethoxyphenyl] tellurium dichloride was decomposed to 2,4-dimethoxybenzene by hot aqueous potassium hydroxide.  

Alkyl aryl tellurium dihalides have a tendency to lose the alkyl group upon treatment with a reducing agent or upon boiling in pyridine s- When bis[ethyldichlorotelluro]benzene was refluxed in pyridine-containing diglyme, polymeric 1,4-phenylene ditellurium was formed . 

Bis[benzoylmethyl] tellurium dichloride eliminates tellurium in a photon-induced reaction. This process is the basis for the use of bis[benzoylmethyl] tellurium dichloride as a component in photo-imaging systems. Dibenzyl tellurium dihalides deposit tellurium on standing at 20° 

Tellurium-carbon bond cleavage was also observed when bis[trifluoromethyl] tellurium dihalides and dibenzyl tellurium dihalidesS° were exposed to elemental halogens. 

The reaction of diaryl tellurium dichlorides with tellurium tetrachloride was used to prepare aryl tellurium trichlorides.  

---

Brominations are performed by dropping solutions containing the stoichiometrically required amount of bromine to the stirred solutions of the diorgano tellurium compounds. To prevent tellurium-carbon bond cleavage, which may occur with dialkyl and alkyl aryl tellurium compounds, the reactions should be performed at or below 20°. The likelihood of Te —C bond cleavage decreases from chlorine to iodine. 

Figure 15 Stereochemistry of the condensation step in erythromycin biosynthesis. Experiments with bimodular DEBS 1-TE in vitro have demonstrated that condensation of (2S)-methylmalonyl-CoA in module 2 proceeds with decarboxylative inversion without cleavage of the C—H bond adjacent to the methyl group. The results are also consistent with the same stereochemistry of condensation, inversion, in module 1, followed by epi-merization of the resulting D-methyl center to the required L-methyl configuration in the P-keto intermediate.

Carbonyl-substituted phenyl organo tellurium compounds react with hydrohalic acids with cleavage of a Te —C bond and the formation of a stabilized aryl tellurium halide. 

Reaction of tellurophene with osmium or ruthenium clusters [M3(CO)io(MeCN)2] (Equation 9) is accompanied by cleavage of a Te-C bond resulting in the formation of the complexes [Os3(CO)ioC4H4Te] <1990CC1568> and [Ru3(CO)ioC4H4Te] <1991JOM63>. 

---