From Other Dibenzotellurophenes

Heating dibenzotellurophene and concentrated nitric acid for 30 min at 100° produced two mononitrodibenzotellurophenes  

2-Nitrodibenzotellurophene 3.6 g (13 mmol) of dibenzotellurophene are dissolved in 24 ml of glacial acetic acid and the mixture is warmed to 70°. 1.5 ml of concentrated nitric acid (d = 1.42) arc added, the mixture is heated on a boiling water bath for 30 min, and cooled. The precipitate is filtered off and recrystallized from benzene. This product has m.p. 184° after an additional recrystallization from ethanol. Concentration of the mother liquors deposits a compound (m.p. 158-161°) that may be impure 4-nitrodibenzotellurophene. 

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The spiro compound, bis(2,2 -biphenylylene)tellurane (63), has been prepared and isolated in good yields.n jg relatively stable compound, which requires fairly high temperatures to decompose into dibenzotellurophene (64) and other products derived from the diradical species, the dibenzocyclobutane (65) being the most important one. 2 xhe activation parameter for the pseudorotation was determined by variable temperature NMR to be AG = 9.2 kcal/mole. ... 

The crystal and molecular structure of dibenzotellurophene and 5,5-diiododibenzotellurophene have been determined by using three-dimensional X-Ray diffraction techniques.98 The two six-membered rings of the diphenyl system are twisted out of plane from each other. Each benzene ring, considered separately, is planar, but the central five-membered ring is not. 

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